AGA - Gas Transmission and Distribution Piping Systems

7/30/2019 AGA - Gas Transmission and Distribution Piping Systems

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Paul Cabot, C.G.E.GPTC Secretary

(202) 824-7312Fax (202) 824-9122

[email protected]

September 22, 2005

Dear Guide Purchaser,

Enclosed is Addendum No. 3 to ANSI GPTC Z380, Guide for Gas Transmission and Distribution Piping Systems, 2003 Edition. Your purchase of the 2003 edition entitles you to receive all addenda.Addenda are formatted to enable the replacement of pages in your Guide with the updated enclosed

pages. Please follow the table on page 2.

On behalf of the Gas Piping Technology Committee and the American Gas Association, thank you for your purchase and interest in the Guide .

Sincerely

SecretaryGPTC/Z380


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1

GPTC GUIDE FOR GAS TRANSMISSION AND DISTRIBUTION PIPING SYSTEMS

2003 EDITON

ADDENDUM NO. 3, September 2005

The changes in this addendum are marked by wide vertical lines inserted to the left of modified text or byoverwriting the left border of most tables. Twelve transactions affected 20 sections of the guide.

Editorial updates include application of the Editorial Guidelines, updating reference titles, adjustments topage numbering, and adjustment of text on pages. While only significant editorial updates are marked, allaffected pages carry the current addendum footnote. Editorial updates affected 5 sections of the guide.

The following table shows the affected sections, the pages to be removed, and their replacement pages.


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2

FS Amendment - Amdt. NumberNew or Updated GM - TR NumberGM Under Review - GMUREditorial Update - EU

Guide Section Reason For Change Pages to be Removed Replacement Pages

Title page EU i/ii i/ii

Table of Contents EU v/vi, vii/viii, ix/x v/vi, vii/viii, ix/x

AGA Disclaimer EU xiii/xiv xiii/xiv

192.3 TR2003-12 17/18 17/18

192.103 EU 35/36 35/36

192.121 TR2003-12 43/44 thru 47/48 43/44 thru 47/48

192.123 TR2003-12

192.143 EU 49/50 49/50192.144 TR2004-12

192.281 TR2003-12 99/100 thru 107/108 99/100 thru 107/108

192.283 TR2003-12, TR2004-18

192.317 TR2004-07 115/116 115/116

192.353 TR2000-15 125/126 thru131(b)/132

125/126 thru131(b)/132

192.355 TR2000-15

192.357 TR2000-15

192.455 EU, TR2004-07 143/144 thru147/148 143/144 thru 147/148192.473 TR2004-07 155/156 thru 159/160 155/156 thru 159/160

192.605 TR2003-41 187/188 thru 191/192 187/188 thru 191/192

192.615 TR2002-25, TR2003-41, TR2004-06

203/204 thru211(b)/212

203/204 thru211(b)/212

192.723 TR2004-22 235/236 235/236

192.943 TR2004-53 262(ae)/262(af) thru262(ag)/262(ah)

262(ae)/262(af) thru262(ai)/262(aj)

192.947 TR2004-55

192.951 TR2004-57GMA G-192-1 TR2003-12 319/320 319/320

GMA G-192-14 TR2004-06 395/396 395/396


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i

Guide for

Gas TransmissionandDistribution Piping

Systems

2003 Edition Addendum No. 3, September 2005

Author:Gas Piping Technology Committee (GPTC) Z380

Accredited by ANSI

Secretariat: Amer ican Gas Ass ociat ion

Approv ed by Amer ican Nat ional Standards Ins ti tu te (ANSI)

August 31 , 2005

ANSI/GPTC Z380.1-2003Catalog Number: X60306 3


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GPTC GUIDE FOR GAS TRANSMISSION ANDDISTRIBUTION PIPING SYSTEMS: 2003 Edition

Add endum No. 1, September 2004 ii

PLEASE NOTE

Addenda to this Guide wi ll also be issued in loose-leaf format so that users wi ll be able to keep theGuide up-to-date by replacing the pages that have been revised with the new pages. It is advisable,however, that pages which have been revised be retained so that the chronological development of the Federal Regulations and the Guide is maintained.

CAUTION

As part of subscription serv ice, GPTC (using AGA as Secretariat) wi ll try to keep subsc ribersinformed on the current Federal Regulations as released by the Department of Transportation (DOT)This is done by periodically issuing addenda to update both the Federal Regulations and the guidematerial. However, the GPTC assumes no r esponsibi lity in the event the material that is automaticallymailed to subscribers never reaches its destination, or is delivered late. Otherwise, the subscriber isreminded that the changes to the Regulations can be timely noted on th e Federal Register's web sit e.

No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise,without the prior written permission of the American Gas Association.

Participation by state and federal agency representative(s) or person(s) affiliated with industry is not to beinterpreted as government or industry endorsement of the guide material in this Guide.

Conversions of figures to electronic format courtesy of ViaData Incorporated.

Copyright 200 5

THE AMERICAN GAS ASSOCIATION400 N. Capitol St., NWWashington, DC 20001

All Rights ReservedPrinted in U.S.A.


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Add endum No. 1, September 2004 v

192.157 Extruded outlets ......................................................................................................... 61192.159 Flexibility ..................................................................................................................... 63192.161 Supports and anchors ................................................................................................ 66192.163 Compressor stations: Design and construction ........................................................ 67192.165 Compressor stations: Liquid removal ........................................................................ 69192.167 Compressor stations: Emergency shutdown ............................................................ 69

192.169 Compressor stations: Pressure limiting devices ....................................................... 70192.171 Compressor stations: Additional safety equipment ................................................... 71192.173 Compressor stations: Ventilation ............................................................................... 72192.175 Pipe-type and bottle-type holders .............................................................................. 73192.177 Additional provisions for bottle-type holders .............................................................. 74192.179 Transmission line valves ........................................................................................... 74192.181 Distribution line valves ............................................................................................... 76192.183 Vaults: Structural design requirements ..................................................................... 77192.185 Vaults: Accessibility .................................................................................................... 78192.187 Vaults: Sealing, venting, and ventilation .................................................................... 78192.189 Vaults: Drainage and waterproofing .......................................................................... 79192.191 Design pressure of plastic fittings .............................................................................. 79192.193 Valve installation in plastic pipe ................................................................................. 80192.195 Protection against accidental overpressuring ........................................................... 81192.197 Control of the pressure of gas delivered from high-pressure

distribution systems .......................................................................................... 83192.199 Requirements for design of pressure relief and limiting devices .............................. 84192.201 Required capacity of pressure relieving and limiting stations ................................... 86192.203 Instrument, control, and sampling pipe and components ......................................... 87

SUBPART E -- WELDING OF STEEL IN PIPELINES ....................................................................... 89192.221 Scope ......................................................................................................................... 89192.223 (Removed) ................................................................................................................. 89192.225 Welding General ..................................................................................................... 89192.227 Qualification of welders .............................................................................................. 90

192.229 Limitations on welders ............................................................................................... 90192.231 Protection from weather ............................................................................................ 91192.233 Miter joints .................................................................................................................. 92192.235 Preparation for welding .............................................................................................. 92192.237 (Removed) ................................................................................................................. 93192.239 (Removed) ................................................................................................................. 93192.241 Inspection and test of welds ...................................................................................... 93192.243 Nondestructive testing ............................................................................................... 94192.245 Repair or removal of defects ..................................................................................... 95

SUBPART F -- JOINING OF MATERIALS OTHER THAN BY WELDING ....................................... 97192.271 Scope ......................................................................................................................... 97192.273 General ...................................................................................................................... 97192.275 Cast iron pipe ............................................................................................................. 98192.277 Ductile iron pipe ......................................................................................................... 98192.279 Copper pipe ................................................................................................................ 99192.281 Plastic pipe ................................................................................................................. 99192.283 Plastic pipe: Qualifying joining procedures ............................................................. 103192.285 Plastic pipe: Qualifying persons to make joints ...................................................... 106192.287 Plastic pipe: Inspection of joints ............................................................................ 107


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Add endum No. 3, September 2005 vi

SUBPART G -- GENERAL CONSTRUCTION REQUIREMENTS FOR TRANSMISSIONLINES AND MAINS ................................................................................................................... 109192.301 Scope ....................................................................................................................... 109192.303 Compliance with specifications or standards .......................................................... 109192.305 Inspection: General .................................................................................................. 109192.307 Inspection of materials ............................................................................................ 110

192.309 Repair of steel pipe .................................................................................................. 110192.311 Repair of plastic pipe ............................................................................................... 111192.313 Bends and elbows .................................................................................................... 112192.315 Wrinkle bends in steel pipe ...................................................................................... 113192.317 Protection from hazards .......................................................................................... 113192.319 Installation of pipe in a ditch ..................................................................................... 115192.321 Installation of plastic pipe ......................................................................................... 117192.323 Casing ...................................................................................................................... 121192.325 Underground clearance ........................................................................................... 122192.327 Cover ........................................................................................................................ 123

SUBPART H -- CUSTOMER METERS, SERVICE REGULATORS, AND SERVICE LINES ........ 125

192.351 Scope ....................................................................................................................... 125192.353 Customer meters and regulators: Location ............................................................. 125192.355 Customer meters and regulators: Protection from damage ................................... 127192.357 Customer meters and regulators: Installation ......................................................... 129192.359 Customer meter installations: Operating pressure ................................................. 130192.361 Service lines: Installation ......................................................................................... 130192.363 Service lines: Valve requirements ........................................................................... 132192.365 Service lines: Location of valves ............................................................................. 132192.367 Service lines: General requirements for connections

to main piping ................................................................................................. 133192.369 Service lines: Connections to cast iron or ductile iron mains .................................. 134192.371 Service lines: Steel .............................................................................................. 134(a)192.373 Service lines: Cast iron and ductile iron .............................................................. 134(b)

192.375 Service lines: Plastic ............................................................................................ 134(b)192.377 Service lines: Copper .............................................................................................. 135192.379 New service lines not in use .................................................................................... 135192.381 Service lines: Excess flow valve performance standards ....................................... 136192.383 Excess flow valve customer notification .................................................................. 139

SUBPART I -- REQUIREMENTS FOR CORROSION CONTROL .................................................. 143192.451 Scope ....................................................................................................................... 143192.452 Applicability to converted pipelines .......................................................................... 143192.453 General .................................................................................................................... 144192.455 External corrosion control: Buried or submerged pipelines

installed after J uly 31, 1971 ............................................................................ 144192.457 External corrosion control: Buried or submerged pipelines

installed before August 1, 1971 ...................................................................... 145192.459 External corrosion control: Examination of buried

pipeline when exposed ................................................................................... 149192.461 External corrosion control: Protective coating ......................................................... 150192.463 External corrosion control: Cathodic protection ...................................................... 151192.465 External corrosion control: Monitoring ..................................................................... 152192.467 External corrosion control: Electrical isolation ......................................................... 153192.469 External corrosion control: Test stations ................................................................. 156192.471 External corrosion control: Test leads ..................................................................... 156


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Add endum No. 3, September 2005 vii

192.473 External corrosion control: Interference currents .................................................... 157192.475 Internal corrosion control: General .......................................................................... 158192.477 Internal corrosion control: Monitoring ...................................................................... 160192.479 Atmospheric corrosion control: General .................................................................. 160192.481 Atmospheric corrosion control: Monitoring .............................................................. 162192.483 Remedial measures: General .................................................................................. 163

192.485 Remedial measures: Transmission lines ................................................................ 163192.487 Remedial measures: Distribution lines other than castiron or ductile iron lines ................................................................................... 165

192.489 Remedial measures: Cast iron and ductile iron pipelines ....................................... 166192.491 Corrosion control records ........................................................................................ 166

SUBPART J -- TEST REQUIREMENTS .......................................................................................... 167192.501 Scope ....................................................................................................................... 167192.503 General requirements .............................................................................................. 167192.505 Strength test requirements for steel pipeline to

operate at a hoop stress of 30 percent or more of SMYS ............................. 168192.507 Test requirements for pipelines to operate at a hoop

stress less than 30 percent of SMYS and at or above 100 p.s.i.g. ................ 171192.509 Test requirements for pipelines to operate below 100 p.s.i.g. ................................ 171192.511 Test requirements for service lines ......................................................................... 172192.513 Test requirements for plastic pipelines .................................................................... 172192.515 Environmental protection and safety requirements ................................................. 173192.517 Records .................................................................................................................... 175

SUBPART K -- UPRATING .............................................................................................................. 177192.551 Scope ....................................................................................................................... 177192.553 General requirements .............................................................................................. 177192.555 Uprating to a pressure that will produce a hoop stress

of 30 percent or more of SMYS in steel pipelines .......................................... 179192.557 Uprating: Steel pipelines to a pressure that will produce a hoop stress less

than 30 percent of SMYS: plastic, cast iron, and ductile iron pipelines ......... 181

SUBPART L -- OPERATIONS .......................................................................................................... 185192.601 Scope ....................................................................................................................... 185192.603 General provisions ................................................................................................... 185192.605 Procedural manual for operations, maintenance, and emergencies ...................... 186192.607 (Removed and reserved) ......................................................................................... 193192.609 Change in class location: Required study ............................................................... 194192.611 Change in class location: Confirmation or revision of

maximum allowable operating pressure ........................................................ 194192.612 Underwater inspection and re-burial of pipelines

in the Gulf of Mexico and its inlets .................................................................. 195192.613 Continuing surveillance ............................................................................................ 196192.614 Damage prevention program ............................................................................... 197(b)192.615 Emergency plans ..................................................................................................... 203192.616 Public awareness ..................................................................................................... 211192.617 Investigation of failures ............................................................................................ 213192.619 Maximum allowable operating pressure: Steel or plastic pipelines ........................ 214192.621 Maximum allowable operating pressure: High-pressure

distribution systems ........................................................................................ 216192.623 Maximum and minimum allowable operating pressure: Low-pressure

distribution systems ........................................................................................ 216


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Add endum No. 1, September 2004 viii

192.625 Odorization of gas .................................................................................................... 217192.627 Tapping pipelines under pressure ........................................................................... 219192.629 Purging of pipelines ................................................................................................. 221

SUBPART M -- MAINTENANCE ....................................................................................................... 223192.701 Scope ....................................................................................................................... 223

192.703 General .................................................................................................................... 223192.705 Transmission lines: Patrolling .................................................................................. 226192.706 Transmission lines: Leakage surveys ..................................................................... 228192.707 Line markers for mains and transmission lines ....................................................... 229192.709 Transmission lines: Record keeping ....................................................................... 230192.711 Transmission lines: General requirements for repair procedures .......................... 230192.713 Transmission lines: Permanent field repair of imperfections

and damages .................................................................................................. 231192.715 Transmission lines: Permanent field repair of welds .............................................. 233192.717 Transmission lines: Permanent field repair of leaks ............................................... 233192.719 Transmission lines: Testing of repairs ..................................................................... 234192.721 Distribution systems: Patrolling ................................................................................ 234192.723 Distribution systems: Leakage surveys .................................................................. 236192.725 Test requirements for reinstating service lines ....................................................... 238192.727 Abandonment or deactivation of facilities ................................................................ 238192.729 (Removed) ............................................................................................................... 241192.731 Compressor stations: Inspection and testing of relief devices ................................ 241192.733 (Removed) ............................................................................................................... 241192.735 Compressor stations: Storage of combustible materials ........................................ 242192.736 Compressor stations: Gas detection ....................................................................... 242192.737 (Removed) ............................................................................................................... 243192.739 Pressure limiting and regulating stations: Inspection and testing ........................... 243192.741 Pressure limiting and regulating stations: Telemetering or

recording gauges ............................................................................................ 245192.743 Pressure limiting and regulating stations: Testing of

relief devices ................................................................................................... 247192.745 Valve maintenance: Transmission lines .................................................................. 249192.747 Valve maintenance: Distribution systems ............................................................... 249192.749 Vault maintenance ................................................................................................... 250192.751 Prevention of accidental ignition .............................................................................. 252192.753 Caulked bell and spigot joints .................................................................................. 255192.755 Protecting cast-iron pipelines ................................................................................... 256192.761 (Removed) ............................................................................................................... 256

SUBPART N -- QUALIFICATION OF PIPELINE PERSONNEL ..................................................... 259192.801 Scope ....................................................................................................................... 259192.803 Definitions ................................................................................................................ 260192.805 Qualification program ........................................................................................... 262(a)192.807 Recordkeeping ...................................................................................................... 262(f)192.809 General ................................................................................................................ 262(g)

SUBPART O -- PIPELINE INTEGRITY MANAGEMENT ............................................................. 262(i)192.901 What do the regulations in this subpart cover? .................................................... 262(i)192.903 What definitions apply to this subpart? ................................................................. 262(i)192.905 How does an operator identify a high consequence area? ................................. 262(k)192.907 What must an operator do to implement this subpart? ........................................ 262(l)192.909 How can an operator change its integrity management program? ...................... 262(l)


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Add endum No. 3, September 2005 ix

192.911 What are the elements of an integrity management program? ......................... 262(m)192.913 When may an operator deviate its program from certain

requirements of this subpart? ..................................................................... 262(n)192.915 What knowledge and training must personnel have to carry out an

integrity management program? ................................................................ 262(o)192.917 How does an operator identify potential threats to pipeline integrity

and use the threat identification in its integrity program? .......................... 262(o)192.919 What must be in the baseline assessment plan? ............................................... 262(q)192.921 How is the baseline assessment to be conducted? ............................................. 262(r)192.923 How is direct assessment used and for what threats? ....................................... 262(s)192.925 What are the requirements for using External Corrosion Direct

Assessment (ECDA)? ................................................................................ 262(s)192.927 What are the requirements for using Internal Corrosion Direct

Assessment (ICDA)? .................................................................................. 262(u)192.929 What are the requirements for using Direct Assessment for Stress

Corrosion Cracking (SCCDA)? ................................................................. 262(w)192.931 How may Confirmatory Direct Assessment (CDA) be used? ............................. 262(x)192.933 What actions must be taken to address integrity issues? ................................... 262(x)192.935 What additional preventive and mitigative measures must an

operator take? ............................................................................................. 262(z)192.937 What is a continual process of evaluation and assessment to

maintain a pipelines integrity? .................................................................. 262(aa)192.939 What are the required reassessment intervals? ............................................... 262(ab)192.941 What is a low stress reassessment? ................................................................. 262(ad)192.943 When can an operator deviate from these reassessment intervals? ............... 262(ae)192.945 What methods must an operator use to measure program

effectiveness? ............................................................................................ 262(af)192.947 What records must an operator keep? ............................................................. 262(ag)192.949 How does an operator notify OPS? .................................................................... 262(ai)192.951 Where does an operator file a report? ............................................................... 262(ai)

APPENDICES TO PART 192Appendix A (Removed and reserved) ................................................................................... 263Appendix B Qualification of Pipe ........................................................................................... 265Appendix C Qualification of Welders for Low Stress Level Pipe .......................................... 267Appendix D Criteria for Cathodic Protection and Determination of Measurements ............. 271Appendix E Guidance on Determining High Consequence Areas and on

Carrying out Requirements in the Integrity Management Rule ................ 272(a)

GUIDE MATERIAL APPENDICESGuide Material Appendix G-191-1 Telephonic notice worksheet ...................................... 273Guide Material Appendix G-191-2 Distribution system incident report .............................. 275Guide Material Appendix G-191-3 Distribution system annual report ............................... 283Guide Material Appendix G-191-4 Transmission and gathering systems

incident report ..................................................... 289Guide Material Appendix G-191-5 Transmission and gathering systems

annual report ...................................................... 303Guide Material Appendix G-191-6 Determination of reporting requirements

for safety-related conditions .............................. 309Guide Material Appendix G-191-7 Safety-related condition report to United States

Department of Transportation ............................ 311


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Add endum No. 3, September 2005 x

Guide Material Appendix G-192-1 Summary of references and related sources ............. 313Guide Material Appendix G-192-1A Editions of material specifications, codes and

standards previously incorporated by referencein the Regulations ........................................................ 327

Guide Material Appendix G-192-2 Specified minimum yield strengths ............................. 331Guide Material Appendix G-192-3 Flexibility factor k and stress

intensification factor i ......................................... 333Guide Material Appendix G-192-4 Rules for reinforcement of welded branchconnections ........................................................ 337

Guide Material Appendix G-192-5 Pipe end preparation ................................................... 347Guide Material Appendix G-192-6 Substructure damage prevention guidelines for

directional drilling and other trenchlesstechnologies ....................................................... 353

Guide Material Appendix G-192-7 [Reserved] ................................................................... 355Guide Material Appendix G-192-8 [Reserved] ................................................................... 355Guide Material Appendix G-192-9 Test conditions for pipelines other

than service lines ............................................... 357Guide Material Appendix G-192-10 Test conditions for service lines .................................. 359Guide Material Appendix G-192-11 Gas leakage control guidelines

for natural gas systems ...................................... 361Guide Material Appendix G-192-11A Gas leakage control guidelines

for petroleum gas systems ................................. 373Guide Material Appendix G-192-12 Planned shutdown ....................................................... 387Guide Material Appendix G-192-13 Considerations to minimize damage by outside

forces .................................................................. 391Guide Material Appendix G-192-14 [Reserved] ................................................................... 395Guide Material Appendix G-192-15 Design of uncased pipeline crossings of

highways and railroads ....................................... 397Guide Material Appendix G-192-15A Horizontal directional drilling for steel pipelines .......... 401Guide Material Appendix G-192-16 Substructure damage prevention guidelines .............. 405Guide Material Appendix G-192-17 Explicit requirements for reports, inspections,

tests, written procedures, recordsand similar actions ............................................. 409

Guide Material Appendix G-192-18 Cast iron pipe .............................................................. 413Guide Material Appendix G-192-19 Memorandum of understanding between the

Department of Transportation and theDepartment of the Interior regardingouter continental shelf pipelines ...................... 417

Guide Material Appendix G-192-20 Fusion equipment maintenance/repair inspectionform ..................................................................... 421

Guide Material Appendix G-192-21 Plastic pipe for bridge crossings ................................. 423Guide Material Appendix G-192-M SI (metric) units ........................................................... 425

INDEX ............................................................................................................................................... 429


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Add endum No. 3, September 2005 xiv

AMERICAN GAS ASSOCIATION (AGA)NOTICE AND DISCLAIMER

The information in this publication was considered technically sound by the consensus of persons engaged inthe development and approval of the document at the time it was developed. Consensus does not

necessarily mean that there is unanimous agreement among every person participating in the developmentof this document.

This document was developed through a voluntary consensus standards development process. This processbrings together volunteers and/or seeks out the views of persons who have an interest in the topic coveredby this publication. While AGA administers the process and establishes rules to promote fairness in thedevelopment of consensus, it does not write the document and it does not independently test, evaluate, orverify the accuracy or completeness of any information or the soundness of any judgments contained in thisstandard and guideline publication.

The AGA disclaims liability for any personal injury, property or other damages of any nature whatsoever,whether special, indirect, consequential or compensatory, directly or indirectly resulting from this publication,use of, or reliance on this publication. The AGA also makes no guaranty or warranty as to the accuracy or

completeness of any information published herein.

In issuing and making this document available, the AGA is not undertaking to render professional or otherservices for or on behalf of any person or entity. Nor is the AGA undertaking to perform any duty owed by anyperson or entity to someone else. Anyone using this document should rely on his or her own independent

judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances.

The AGA has no power, nor does it undertake, to police or enforce compliance with the contents of thisdocument. Nor does the AGA list, certify, test, or inspect products, designs, or installations for compliancewith this document. Any certification or other statement of compliance with the requirements of this documentshall not be attributable to the AGA and is solely the responsibility of the certifier or maker of the statement.

The AGA does not take any position with respect to the validity of any patent rights asserted in connectionwith any items which are mentioned in or are the subject of this publication, and the AGA disclaims liability forthe infringement of any patent resulting from the use of or reliance on it. Users of this publication areexpressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.

Users of this publication should consult applicable federal, state, and local laws and regulations. The AGAdoes not, through this publication, intend to urge action that is not in compliance with applicable laws, and thispublication may not be construed as doing so.


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GPTC GUIDE FOR GAS TRANSMISSION AND 192.3DISTRIBUTION PIPING SYSTEMS: 2003 Edition SUBPART A

Add endum No. 3, September 2005 17

Maximum allowable hoop stress is the maximum hoop stress permitted for the design of a piping system. Itdepends upon the material used, the class location of the pipe, and the operating conditions. See alsoHoop stress .

Maximum allowable test pressure is the maximum internal fluid pressure permitted for testing, for thematerials, and class location involved.

Meters . See Customer meter and Meter set assembly .

Meter set assembly is the piping installed to connect the inlet side of the meter to the gas service line, and toconnect the outlet side of the meter to the customer's fuel line.Monitoring regulator is a pressure regulator, set in series with another pressure regulator, for the purpose of

providing automatic overpressure protection in the event of a malfunction of the primary regulator.Nodular iron . See Ductile iron .Nominal outside diameter (D) is the outside diameter, in inches, as listed in Table 192.105i for nominal pipe

size 12 inches and less, and is the same as the nominal pipe size greater than 12 inches. It is used inthe design formula for steel pipe in 192.105 and the calculation for hoop stress.

Nominal wall thickness (t) is the wall thickness, in inches, computed by, or used in, the design formula forsteel pipe in 192.105. Pipe may be ordered to this computed wall thickness without adding anallowance to compensate for the under-thickness tolerances permitted in approved specifications.

Operating stress is the stress in a pipe or structural member under normal operating conditions.Overpressure protection is the use of a device or equipment installed for the purpose of preventing pressure

in a pipe system or other facility from exceeding a predetermined limit. See also Pressure limitingstation, Pressure regulating station, Pressure relief station, and Service regulator .

PA is polyamide.Parallel encroachment pertains to that portion of the route of a transmission line or main that lies within, runs

in a generally parallel direction to, and does not necessarily cross, the rights-of-way of a road, street,highway, or railroad.

PE is polyethylene.Pipe . See Bell-welded pipe, Cold expanded pipe, Continuous-welded pipe, Control piping,

Double-submerged-arc-welded pipe, Electric-flash-welded pipe, Electric-fusion-welded pipe,Electric-resistance-welded pipe, Furnace-butt-welded pipe, Furnace-lap-welded pipe, Instrument piping,Length, Pipe-container, Pipe manufacturing processes, Pipe-type holder, Sample piping, and Seamlesspipe .

Pipe-container is a gas-tight structure assembled from pipe and end closures. See also Pipe-type holder .Pipe manufacturing processes . A reference is ASME I00396 History of Line Pipe Manufacturing in North

America. Types and names of welded joints are used herein as defined in the American WeldingSociety (AWS) Publication A3.0 "Standard Welding Terms and Definitions" except for the followingterms which are defined in this glossary.

Bell-welded pipeContinuous-welded pipeDouble-submerged-arc-welded pipeElectric-flash-welded pipeElectric-fusion-welded pipeElectric-resistance-welded pipeFurnace-butt-welded pipeFurnace-lap-welded pipe

Seamless pipePipe-type holder is any pipe-container or group of interconnected pipe-containers installed at one location forthe sole purpose of storing gas. See also Pipe-container .

Plastic (noun) is a material that contains one or more organic polymeric substances of high molecular weightas an essential ingredient, is solid in its finished state, and can be shaped by flow at some stage of itsmanufacture or processing into finished articles. The two general types of plastic referred to in thisGuide are thermoplastic and thermosetting. See also Thermoplastic and Thermosetting plastic.

Plastic pipe joints . See Adhesive joint, Heat fusion joint, and Solvent cement joint .Pressure (expressed in pounds per square inch above atmospheric pressure, i.e., gauge pressure

(abbreviation: psig), unless otherwise stated). See also Maximum allowable test pressure,Overpressure protection, Pressure limiting station, Pressure regulating station, Pressure relief station,and Standup pressure test .


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GPTC GUIDE FOR GAS TRANSMISSION AND 192.3DISTRIBUTION PIPING SYSTEMS: 2003 Edition SUBPART A

18

Pressure limiting station consists of apparatus which, under abnormal conditions, will act to reduce, restrict orshut off the supply of gas flowing into a transmission line, main, holder, pressure vessel or compressorstation piping in order to prevent the gas pressure from exceeding a predetermined limit. While normalpressure conditions prevail, the pressure limiting station may exercise some degree of control of theflow of gas or may remain in the wide-open position. Included in the station are any enclosures andventilating equipment, and any piping and auxiliary equipment (such as valves, control instruments, or

control lines).Pressure regulating station consists of apparatus installed for the purpose of automatically reducing andregulating the gas pressure in the downstream transmission line, main, holder, pressure vessel orcompressor station piping to which it is connected. Included in the station are any enclosures andventilating equipment, and any piping and auxiliary equipment (such as valves, control instruments, orcontrol lines).

Pressure relief station consists of apparatus installed to vent gas from a transmission line, main, holder,pressure vessel, or compressor station piping in order to prevent the gas pressure from exceeding apredetermined limit. The gas may be vented into the atmosphere or into a lower pressure gas systemcapable of safely receiving the gas being discharged. Included in the station are any enclosures andventilating equipment, and any piping and auxiliary equipment (such as valves, control instruments, orcontrol lines).

Private rights-of-way are those that are not located on roads, streets or highways used by the public, nor onrailroad rights-of-way.

Proprietary items are items made by a company having the exclusive right of manufacture.Public place is a place that is generally open to all persons in a community as opposed to being restricted

to specific persons. A public place includes churches, schools, and commercial property, as well asany publicly owned right-of-way or property that is frequented by people.

PVC is poly (vinyl chloride), which is also written as polyvinyl chloride.Regulators . See Pressure limiting station, Pressure regulating station, Pressure relief station, and Service

regulator .Sample piping is pipe, valves, and fittings used for the collection of samples of gas or other fluids.SCADA is supervisory control and data acquisition. SCADA is a remote control system that allows the

transmission of data from a remote site (e.g., a delivery point) to a central control location. SCADAsystems are used to monitor and control flow, pressure, and other parameters of the pipeline system.SCADA systems may generate an alarm that an event has occurred or an unusual situation isdeveloping.

Seamless pipe is a wrought tubular product made without a welded seam. It is manufactured by hot workingsteel or, if necessary, by subsequently cold finishing the hot-worked tubular product to produce thedesired shape, dimensions, and properties. See also Pipe manufacturing processes .

Secondary stress is stress created in the pipe wall by loads other than internal fluid pressure. Examples arebackfill loads, traffic loads, beam action in a span and loads at supports and at connections to the pipe.

Service line valve is a valve located in the service line ahead of the service regulator, or ahead of the meterwhen there is no regulator.

Service regulator is a device installed on a gas service line to control the pressure of the gas delivered to thecustomer.

Solvent cement joint is a joint made in PVC piping by using solvent cement to unite the piping components.Standup pressure test is a test to demonstrate that a pipe or piping system does not leak as evidenced by the

lack of a drop in pressure over a specified period of time after the source of pressure has been isolated.Steel is an iron-base alloy, malleable in some temperature range as initially cast, containing manganese,carbon, and often other alloying elements. See also Carbon steel .

Stress is the resultant internal force that resists change in the size or shape of a body acted on by externalforces. See also Hoop stress, Maximum allowable hoop stress, Operating stress, Secondary stress,Tensile strength, and Yield strength .

Temperature (expressed in degrees Fahrenheit ( oF) unless otherwise stated). See also Ambient temperatureand Ground temperature .


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GPTC GUIDE FOR GAS TRANSMISSION AND 192.101DISTRIBUTION PIPING SYSTEMS: 2003 Edition SUBPART C


SUBPART CPIPE DESIGN

192.101Scope.

[Effective Date: 11-12-70]

This subpart prescribes the minimum requirements for the design of pipe.

GUIDE MATERIAL

No guide material necessary.

192.103General.


Pipe must be designed with sufficient wall thickness, or must be installed with adequateprotection, to withstand anticipated external pressures and loads that will be imposed on the pipeafter installation.

GUIDE MATERIAL

1 GENERAL

The minimum wall thickness for pressure containment as calculated under 192.105 may not beadequate to withstand other forces to which the pipeline may be subjected. Consideration should begiven to stresses associated with transportation, handling the pipe during construction, weight of waterduring testing, buoyancy, geotechnical forces, and other secondary loads that may occur duringconstruction, operation or maintenance. Consideration should also be given to welding or mechanical

joining requirements.

2 NON-STEEL PIPE

The minimum wall thickness for materials other than steel pipe are prescribed elsewhere in Part 192.See 192.123 and 192.125.

3 REFERENCES

Numerous references are available for the calculation of external forces on pipelines. Methods includereliance on experience, empirical formula, and finite element analysis. A partial listing of referencesfollows.(a) API RP 5L1, Recommended Practice for Railroad Transportation of Line Pipe.(b) API RP 5LW, Recommended Practice for Transportation of Line Pipe on Barges and Marine

Vessels."


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(c) API RP 1102, Steel Pipelines Crossing Railroads and Highways.(d) API RP 1117, Movement of In-Service Pipelines.(e) ASCE 428-5, Guidelines for the Seismic Design of Oil and Gas Pipeline Systems" (Discontinued).(f) GRI-91/0283, Guidelines for Pipelines Crossing Railroads.(g) GRI-91/0284, Guidelines for Pipelines Crossing Highways.

192.105Design formula for steel pipe.


(a) The design pressure for steel pipe is determined in accordance with the following formula:

P = 2 St x F x E x TD

P = Design pressure in pounds per square inch (kPa) gage.

S = Yield strength i n pounds per square inch (kPa) determined in accordance with 192.107.

D = Nominal outside diameter of the pipe in inches (millimeters).

t = Nominal wall thickness of the pipe in inches. If this is unknown, it is determined in accordancewith 192.109. Additional wall thickness required for concurrent external loads in accordancewith 192.103 may not be included in comput ing design pressure.

F = Design factor determined in accordance with 192.111.

E = Longitudinal joint factor determined in accordance with 192.113.

T = Temperature derating factor determined in accordance with 192.115.

(b) If steel pipe that has been subjected to cold expansion to meet the SMYS is subsequentlyheated, other than by welding or stress relieving as a part of welding, the design pressure is limitedto 75 percent of the pressure determined under paragraph (a) of this section if t he temperature of thepipe exceeds 900 oF (482 oC) at any time or is held above 600 oF (316 oC) for mo re than 1 hour.

[Amdt. 192-47, 49 FR 7567, Mar. 1, 1984; Amdt. 192-85, 63 FR 37500, July 13, 1998]

GUIDE MATERIAL

1 WALL THICKNESS

The nominal wall thickness (t) should not be less than that determined by the considerations given in theguide material under 192.103.

2 NOMINAL OUTSIDE DIAMETER

The nominal outside diameter ( D) used in the design formula is listed in Table 192.105i for nominal pipesizes (NPS) 12 inches and less. For pipe greater than 12 inches, the nominal pipe size and nominaloutside diameter are the same. Pipe may be ordered by the nominal pipe size; however, the nominaloutside diameter is required in the design formula for steel pipe.


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Where:P = Design pressure, gauge, kPa (psig).S = For thermoplastic pipe, the HDB determined in accordance with the listed specification

at a temperature equal to 73 oF (23 oC), 100 oF (38 oC), 120 oF (49 oC), or 140 oF (60 oC). Inthe absence an HDB established at the specified temperature, the HDB of a higher temperature may be used in determining a design pressure rating at the specified

temperature by arithmetic interpolation using the procedure in Part E of PPI TR3/2000entitled, Policy for Determining Long-Term Strength (LTHS) by TemperatureInterpolation, as publ ished i n the technical Report TR3/2000 HDB/PDB/MRS Policies ,(ibr, see 192.7). For reinforced thermosetting plastic pipe, 11,000 psig (75,842 kPa).

t = Specified wall thickness, mm (in.).D = Specified outside diameter, mm (in.).SDR = Standard dimension ratio, the ratio of the average specified outside diameter to t he

minimum specified wall thickness, corresponding to a value from a common numberingsystem that was derived from the American National Standards Institute preferrednumber series 10.

[Amdt. 192-31, 43 FR 13880, Apr. 3, 1978 with Amdt. 192-31 Correction, 43 FR 43308, Sept. 25, 1978; Amdt. 192-78, 61 FR 28770, June 6, 1996 with Amdt. 192-78 Correct ion, 61 FR 30824, June 18, 1996;

Amdt . 192-85, 63 FR 37500, Ju ly 13, 1998; Am dt . 192-94, 69 FR 32886, June 14, 2004]

GUIDE MATERIAL

This guide material is under review following Amendment 192-94.

1 NATURAL GAS

(a) Hydrostatic Design Basis (HDB) values are awarded by the Hydrostatic Stress Board (HSB) of thePlastics Pipe Institute (PPI) and are listed in PPI TR-4, which can be accessed atwww.plasticpipe.org.

(b) ASTM D 2513 requires elevated temperature HDB listings for plastic piping materials used attemperatures above 73 F. PPI publishes elevated temperature HDB values for PE and PAmaterials in TR-4.

(c) Magnetically-filled PE (reference ASTM D 2513, Annex A.6) is considered as either PE 2406 or PE3408 material.

(d) Long-term hydrostatic strength for reinforced thermosetting plastic covered by ASTM D 2517 is11,000 psi.

(e) HDB values apply only to materials meeting all the requirements of ASTM D 2513 and are based onengineering test data analyzed in accordance with ASTM D 2837, "Standard Test Method forObtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for

Thermoplastic Pipe Products."(f) HDB values at 73 F for thermoplastic materials covered by ASTM D 2513 are listed in Table

192.121i. The values used in the design formula for thermoplastic materials are actually HDB values

that are a categorized value of the long-term hydrostatic strength.


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Pipe Material HDB @ 73 F, psi

PA 32312 (PA 11) 2500

PE 2406 1250

PE 3408 1600

PVC Type I, Grade 1, Class 12454B (PVC 1120)* 4000

PVC Type II, Grade 1, Class 1433D (PVC 2116)* 3200

* Editions of ASTM D 2513 issued after 2001 no longer permit use of PVC piping for newgas piping installations, but do specify that it may be used for repair and maintenance of existing PVC gas piping. The Regulations may continue to reference an edition of ASTM D2513 earlier than 2001. The operator is advised to check 192.7.

TABLE 192.121i2 PETROLEUM GASES

PE and PA materials listed in ASTM D 2513 may be used for liquid petroleum gas (LPG) pipingapplications. NFPA 58 (referenced by 192.7) prescribes the following:(a) PA may be used in liquid or vapor LPG systems up to the design pressure of the piping material.

PPI recommends a chemical derating factor of 1.0 (no derating) for PA 11 piping.(b) PE, when recommended by the manufacturer, may be used in vapor-only LPG systems up to 30

psig pressure. PPI recommends a 0.5 chemical derating factor for the use of PE piping.(c) PVC is not permitted.

Some information on the strengths of polyethylenes with propane is given in PPI TR-22, PolyethylenePiping Distribution Systems for Components of Liquid Petroleum Gases. See guide material under192.123.

3 MINIMUM REQUIRED WALL THICKNESS

The minimum wall thickness (t m) for a given design pressure is determined from the formula below.Also, see 192.123 (c) and (d) plus 3 of the guide material under 192.123.

tm = PD(P +0.64 S)

Where:P = Design pressure, gauge, kPa (psi)D = Specified outside diameter, mm (in.)S = The long-term hydrostatic strength, for thermoplastic pipe, kPa (psi) determined at 23 oC

(73 oF), 38 oC (100 oF), 49 oC (120 oF), or 60 oC (140 oF); for reinforced thermosettingpipe, 75,800 kPa (11,000 psi)

4 REFERENCES

(a) PPI TR-4, "PPI Listing of Hydrostatic Design Basis (HDB), Strength Design Basis (SDB), PressureDesign Basis (PDB) and Minimum Required Strength (MRS) Ratings for Thermoplastic PipingMaterials or Pipe."

(b) PPI TR-22, "Polyethylene Piping Distribution Systems for Components of Liquid Petroleum Gases."


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192.123Design l imitations for plastic pipe.


(a) Except as provided in paragraph (e) of this section, the design pressure may not exceed agauge pressure of 100 psig (689 kPa) for plastic pipe used in :

(1) Distribution systems; or (2) Classes 3 and 4 locations.

(b) Plastic pipe may not be used where operating temperatures of the pipe will be:(1) Below 20 oF (29 oC), or 40 oF (40 oC) if all pipe and pipeline components whose

operating temperature will be below 20 oF (29 oC) have a temperature rating by the manufacturer consistent with that operating temperature; or

(2) Above the following applicable temperatures:(i) For thermoplastic pipe, the temperature at which the HDB used in the design

formula under 192.121 is determined.(ii) For reinforced thermosetting plastic pipe, 150 oF (66 oC).

(c) The wall thickness for thermoplastic pipe may not be less than 0.062 inches (1.57

millimeters).(d) The wall thickness for reinforced thermosetting plastic pipe may not be less than that listedin the following table:

Nominalsize in

inches (millimeters)

Minimum wallthickness in

inches (millimeters)

2 (51)3 (76)

4 (102)6 (152)

0.060 (1.52)0.060 (1.52)0.070 (1.78)0.100 (2.54)

(e) The design pressure for thermoplastic pipe produced after July 14, 2004 may exceed agauge pressure of 100 psig (689 kPa) prov ided that:

(1) The design pressure does not exceed 125 psig (862 kPa);(2) The material i s a PE2406 or a PE3408 as speci fied wit hin ASTM D2513 (ibr, see 192.7);(3) The pipe size is nominal pipe size (IPS) 12 or less; and(4) The design pressure is determined in accordance with t he design equation defined in

192.121.

[Amdt. 192-31, 43 FR 13880, Apr. 3, 1978; Amdt. 192-78, 61 FR 28770, June 6, 1996 with Amdt. 192-78Correction, 61 FR 30824, June 18, 1996; Amdt. 192-85, 63 FR 37500, July 13, 1998; Amdt. 192-93, 68FR 53895, Sept. 15, 2003; Amdt. 192-94, 69 FR 32886, June 14, 2004 with Amdt. 192-94 Correction,69 FR 54591, Sept. 9, 2004]

GUIDE MATERIAL

This guide material is under review following Amendment 192-94.

1 IMPACT AND DUCTILITY

The impact and ductility properties of plastics should be evaluated when the material is intended for usein facilities subjected to low temperatures.


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2 PETROLEUM GASES

The pressure-temperature relationship with petroleum gases should be such that condensation will notoccur when using PE piping.

3 HOT TAPS

(a) To minimize the probability of a blowout when making a hot-plate saddle fusion on polyethylene(PE) pipe with a wall thickness of 0.216 inches or less, operating at pressures up to and including100 psig, it may be necessary to require heavier wall thickness than determined by the pressuredesign formula. The manufacturer of the PE pipe should be contacted for recommendations.

(b) For those PE pipelines operated at pressures greater than 100 psig, the probability of blowoutswhen making hot-plate saddle fusions increases due to the increased pressure. The pipelinepressure may need to be reduced during such fusions.

(c) Electrofusion tapping tees may be used as an alternate to hot-plate fusion tapping tees to reducethe probability of blowouts when hot tapping PE pipes. The manufacturer of the electrofusion fittingshould be contacted for recommendations.

(d) Mechanical tapping tees may be used as an alternative to heat-fusion tapping tees to avoid thepossibility of blowouts when tapping PE pipes.

4 EFFECTS OF LIQUID HYDROCARBONS

4.1 General.Liquid hydrocarbons such as gasoline, diesel fuel, and condensates, either inside the pipe or in thesurrounding soil, are known to have a detrimental effect on PE and PVC plastic piping materials. PA 11piping is not affected by liquid hydrocarbons. Contact the piping manufacturer for specificrecommendations.

4.2 Effect on design pressure (see 192.121).(a) If thermoplastic materials covered by ASTM D 2513 are to be exposed continuously to liquid

hydrocarbons, it is recommended that the design pressure be de-rated in accordance with thefollowing formula. See 4.3 below for references on this subject.

P de-rated =P 192.121 x DF C

Where:P de-rated =De-rated design pressure, gauge, psig (kPa).P 192.121 =Design pressure, gauge, psig (kPa) determined under 192.121.DFC = Chemical Design Factor determined in accordance with Table 192.123i.

Pipe Material Chemical Design Factor

PA (polyamide) 1.00PE (polyethylene) 0.50

PVC (polyvinyl chloride) 0.50

TABLE 192.123i

(b) If PE or PVC pipe is to be exposed intermittently to liquid hydrocarbons, the pipe manufacturershould be consulted to determine the appropriate DF C.


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4.3 References.(a) PA pipe.

(1) An Evaluation of Polyamide 11 for Use in High Pressure/High Temperature Gas PipingSystems, T.J . Pitzi et al., 15th Plastic Fuel Gas Pipe Symposium Proceedings - 1997, p. 107.

(2) Polyamide 11 Liners Withstand Hydrocarbons, High Temperature, A. Berry, Pipeline & Gas J ournal, December 1998, p. 81.

(b) PE pipe.(1) PPI TR-9, Recommended Design Factors and Design Coefficients for Thermoplastic PressurePipe.

(2) PPI TR-22, Polyethylene Piping Distribution Systems for Components of Liquid PetroleumGases.

(3) Mechanical Integrity of Fusion J oints Made from Polyethylene Pipe Exposed to HeavyHydrocarbons, S.M. Pimputkar, 14th Plastic Fuel Gas Pipe Symposium Proceedings - 1995, p.141.

(4) Strength of Fusion J oints Made from Polyethylene Pipe Exposed to Heavy Hydrocarbons, S.M.Pimputkar, 15th Plastic Fuel Gas Pipe Symposium Proceedings - 1997, p. 309.

(5) GRI 96/0194, Service Effects of Hydrocarbons on Fusion and Mechanical Performance of Polyethylene Gas Distribution Piping.

(c) PVC pipe.Prediction of Organic Chemical Permeation through PVC Pipe, A.R. Berens, Research

Technology, November 1985, p. 57.

5 PLASTIC PIPE MANUFACTURED BEFORE MAY 18, 1978

The following language was removed from 192.123(b)(2)(i) by Amendment 192-93: However, if the pipe was manufactur ed before May 18, 1978 and its l ong-term hydr ostaticstr ength was determ ined at 73 F (23 C), it m ay be used at temperatu res up t o 100 F(38 C).

This language permitted the installation and operation of plastic pipe manufactured prior to May 18,1978, at temperatures up to 100 F using the 73 F HDB. This sentence was removed since thisvintage plastic pipe is no longer available nor is it still being installed. However, pipe installed underthis clause is grandfathered and can continue to be operated at temperatures up to 100 F using the73 F HDB.

192.125Design of copper pipe.


(a) Copper pipe used in mains must have a minimum wall thickness of 0.065 inches (1.65millimeters) and must be hard drawn.

(b) Copper pipe used in service lines must have wall thickness not less than that indicated inthe following table:


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Standardsize inch

(millimeter)

NominalO.D. inch

(millimeter)

Wall thickness inch (millimeter)

Nominal Tolerance

1/2 (13)5/8 (16)3/4 (19)

1 (25)1 1/4 (32)1 1/2 (38)

.625 (16)

.750 (19)

.875 (22)1.125 (29)1.375 (35)1.625 (41)

.040 (1.06)

.042 (1.07)

.045 (1.14)

.050 (1.27)

.055 (1.40)

.060 (1.52)

.0035 (.0889)

.0035 (.0889)

.0040 (.1020)

.0040 (.1020)

.0045 (.1143)

.0045 (.1143)

(c) Copper pipe used in mains and service lines may not be used at pressures in excess of 100p.s.i. (689 kPa) gage.

(d) Copper pipe that does not have an internal corrosion resistant lining may not be used tocarry gas that has an average hydrogen sulfide content o f more than 0.3 grains/100 ft 3 (6.9/m 3) under standard conditions. Standard conditions refers to 60 oF and 14.7 psia (15.6 oC and one atmosphere)of gas.

[Amdt. 192-62, 54 FR 5625, Feb. 6, 1989; Amdt. 192-85, 63 FR 37500, July 13, 1998]

GUIDE MATERIAL

See 192.377 for additional requirement regarding copper service lines.


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GPTC GUIDE FOR GAS TRANSMISSION AND 192.141DISTRIBUTION PIPING SYSTEMS: 2003 Edition SUBPART D


SUBPART DDESIGN OF PIPELINE COMPONENTS

192.141Scope.


This subpart prescribes minimum requirements for the design and installation of pipelinecomponents and facilities. In addition, it prescribes requirements relating to protection againstaccidental overpressuring.

GUIDE MATERIAL

Useful industry references for design and construction of auxiliary piping for compressor stations or othersimilar installations (other than gas piping) are listed in Table 192.141i. Federal, state and local requirementsmay also apply.

Piping System Fluid Design Code

Power piping (boiler externalpiping)

Air, steam, water, oil, gas, steamcondensate

ASME B31.1

Power piping (non-boiler externalpiping)

Air, steam, water, oil, gas, steamcondensate

ASME B31.3

Utility, auxiliary, process, airinjection

Air, steam, water, oil, steamcondensate, glycol, natural gasliquids

ASME B31.3

Process Hydrocarbons, chemicals ASME B31.3Refrigeration Refrigerant (e.g., propane) ASME B31.3 or B31.5

Fire protection Water NFPA 14 and 24

Drinking and domestic supply Water AWWA Standards; UniformPlumbing Code

Plumbing and drains Sanitary and waste water Uniform Plumbing Code

TABLE 192.141i

192.143General requirements.


Each component of a pipeline must be able to withstand operating pressures and other anticipated loadings without impairment of its serviceability with unit stresses equivalent to thoseallowed for comparable material in pipe in the same location and kind of service. However, if designbased upon unit stresses is impractical for a particular component, design may be based upon apressure rating established by the manufacturer by pressure testing that component or a prototypeof the component.


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GPTC GUIDE FOR GAS TRANSMISSION AND 192.143DISTRIBUTION PIPING SYSTEMS: 2003 Edition SUBPART D


[Amdt. 192-48, 49 FR 19823, May 10, 1984]

GUIDE MATERIAL

The designer should select components that will withstand the field test pressure to which they will be

subjected without failure or leakage and without impairment to their serviceability. Consideration should alsobe given to pulsation-induced vibrations that could produce excessive cyclic stresses.

See Guide Material Appendix G-192-9 and Guide Material Appendix G-192-10.

192.144Qualifying Metallic Components.


Notwithstanding any requirement of this subpart which incorporates by reference an edition of

a document list ed in 192.7 or Appendix B o f this part, a metallic component manufactured inaccordance with any other edition of that document is qualified for use under this part if --(a) It can be shown through visual inspection of the cleaned component that no defect exists

which might impair the strength or tightness of the component; and(b) The edition of the document under which the component was manufactured has equal or

more stringent requirements for the follow ing as an edition of that document currently or previouslylist ed in 192.7 or appendix B of this p art:

(1) Pressure testing;(2) Materials; and(3) Pressure and temperature ratings.

[Issued by Amdt. 192-45, 48 FR 30637, July 5, 1983; Amdt. 192-94, 69 FR 32886, June 14, 2004]

GUIDE MATERIAL

See Guide Material Appendix G-192-1A for documents previously incorporated by reference in theRegulations. Current documents incorporated by reference that were listed in Appendix A prior toAmendment 192-94, published J une 14, 2004, are now found in 192.7.

If the edition of the document under which the component was manufactured was neither previously listednor currently listed in 192.7, and was not previously listed in Appendix A, then requirements under192.144(b) should be reviewed to determine if the metallic component is qualified for use under Part 192.

192.145Valves.


(a) Except for cast iron and plastic valves, each valve must meet the minimum requirements of API 6D (ibr, see 192.7), or to a national or in ternational s tandard that p rovides an equivalent


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GPTC GUIDE FOR GAS TRANSMISSION AND 192.279DISTRIBUTION PIPING SYSTEMS: 2003 Edition SUBPART F

99

192.279Copper pipe.


Copper pipe may not be threaded except that copper pipe used for joining screw fittings or valves may be threaded if the wall thickness is equivalent to the comparable size of Schedule 40 or heavier wall pipe listed in Table C1 of ASME/ANSI B16.5.

[Amdt. 192-62, 54 FR 5625, Feb. 6, 1989; Amdt. 192-68, 58 FR 14519, Mar. 18, 1993]

GUIDE MATERIAL

(a) Copper pipe may be joined by a mechanical joint or a brazed or soldered lap joint. The filler materialused for brazing should be a copper-phosphorous or a silver base alloy.

(b) Butt welds should not be used for joining copper pipe or copper tubing.

192.281Plastic pipe.


(a) General . A plastic pipe joint that is joined by solvent cement, adhesive, or heat fusion maynot be disturbed until it has properly set. Plastic pipe may not be joined by a threaded joint or miter

jo int.(b) Solvent cement joints . Each solvent cement joint on plastic pipe must comply with the

following:

(1) The mating surfaces of the joint must be clean, dry, and free of material which might bedetrimental to the joint.(2) The solvent cement must co nform t o ASTM Designation D 2513.(3) The joint may not be heated to accelerate the setting of the cement.

(c) Heat-fusion joints . Each heat-fusion joint on plastic pipe must comply with the following:(1) A butt heat-fusion joint m ust be joined by a device that holds the heater element square

to the ends of the piping, compresses the heated ends together, and holds the pipe in proper alignment while the plastic hardens.

(2) A socket heat-fusion joint must be joined by a device that heats the mating surfaces of the joint uniformly and simultaneously to essentially the same temperature.

(3) An electrofusion joint must be joined utilizing the equipment and techniques of thefittings manufacturer or equipment and techniques shown, by testing joints to the requirements of 192.283(a)(1)(iii), to be at l east equiv alent to those of the fi ttings manufacturer.

(4) Heat may not be applied with a torch or other open flame.(d) Adhesive jo ints . Each adhesive joint on plastic pipe must comply w ith the follow ing:

(1) The adhesive must conform to ASTM Designation D 2517.(2) The materials and adhesive must be compatible with each other.

(e) Mechanical joints . Each compression type mechanical joint on plastic pipe must complywith the following:

(1) The gasket material in the coupling must be compatible with the plastic.(2) A rigid internal tubular stiffener, other than a split tubular stiffener, must be used in

conjunction with the coupling.


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[Amdt. 192-34, 44 FR 42968, July 23, 1979 with Amdt. 192-34 Correction, 44 FR 50841, Aug. 30, 1979and Amdt. 192-34 Correction, 44 FR 57100, Oct. 4, 1979; Amdt. 192-58, 53 FR 1633, Jan. 21, 1988;

Amdt. 192-61, 53 FR 36793, Sept. 22, 1988; Amdt. 192-68, 58 FR 14519, Mar. 18, 1993; Am dt. 192-78, 61FR 28770, June 6, 1996 with Amdt. 192-78 Correction, 61 FR 30824, June 18, 1996]

GUIDE MATERIAL

1 INTRODUCTION (Plastic-to-plastic and plastic-to-metal)

Skillful application of qualified procedures and the use of proper materials and equipment in goodcondition are needed to achieve sound joints in plastic piping. J oints should be made by personnelqualified by training or experience in the written procedures required for the type of joint involved.

2 GENERAL (Plastic-to-plastic)

Plastic piping is joined by several material-specific joining methods, including solvent cement, heatfusion, and adhesives, as described below. All plastic piping materials may be joined by mechanicalmethods. The Regulations require that the joining procedures be qualified and that joining personnel andinspectors be trained and qualified. (See 192.281, 192.283, 192.285, and 192.287.)

3 FIELD JOINING (Plastic-to-plastic and plastic-to-metal)

3.1 Solvent cement for repairing PVC piping only. (Plastic-to-plastic)Note: Editions of ASTM D 2513 issued after 2001 no longer permit use of PVC piping for newinstallations, but do specify that it may be used for repair and maintenance of existing PVC gas piping.

The Regulations may continue to reference an edition of ASTM D 2513 earlier than 2001. The operatoris advised to check 192.7.(a) The solvent cement and piping components may be conditioned prior to assembly by warming,

provided that it is done in accordance with the manufacturer's recommendations. Specialprecautions are required when the surface temperature of the material is below 50 oF or above 100oF.

(b) Square cut ends free of burrs are required for a proper socket joint. Beveling of the leading edge of the spigot end will provide for ease of insertion and better distribution of the cement.

(c) Proper fit between the pipe or tubing and the mating socket or sleeve is essential to a good joint.Before application of cement, the pipe or tubing should freely enter the fitting but should not bottomagainst the internal shoulder. Sound joints cannot normally be made between components that havea loose or very tight fit.

(d) A uniform coating of the solvent cement is required on both mating surfaces. A light coating shouldbe applied to the socket and a heavier coating applied to the pipe or tubing. The pipe shouldimmediately be inserted into the socket and bottomed in the socket.

For diameters greater than 2 inches, additional measures may be necessary to bottom the pipe. The completed joint should be held together for sufficient time to prevent the pipe from backing out

of the fitting. After the joint is made, excess cement should be removed from the outside of the joint.(e) The joint should not be subject to a pressure test until it has developed a high percentage of itsultimate strength. The time required for this to occur varies with the type of cement, humidity, andtemperature.

(f) Other recommendations for making joints may be found in ASTM D 2855 (for PVC), the Appendixof ASTM D 2235 (for ABS), and the Appendix of ASTM D 2560 (for CAB).


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3.2 Heat fusion for PA-to-PA and PE-to-PE only by externally applied heat. (Plastic-to-plastic)(a) PA and PE cannot be fused to each other.(b) General training programs that include both printed material and slides are available from the

Plastics P ipe Institute (see Guide Material Appendix G-192-1) and many manufacturers of plasticpipe.

(c) Care should be used in the heating operation. The material should be sufficiently heated to produce

a sound joint but not overheated to the extent that the material is damaged.(d) Square cut ends free of burrs are required for a proper joint.(e) The mating surfaces should be clean, dry, and free of material which might be detrimental to the

joint.(f) Other recommendations for making heat-fusion joints may be found in ASTM D 2657.(g) PE piping of different compounds or grades can be heat fused to each other. Such joining should

not be undertaken indiscriminately, and should be undertaken only when qualified procedures for joining the specific compounds are used. Suggested references are as follows.(1) PPI TN-13, "General Guidelines for Butt, Saddle and Socket Fusion of Unlike Polyethylene

Pipes and Fittings."(2) PPI TR-33, Generic Butt Fusion J oining Procedure for Polyethylene Gas Pipe.(3) PPI TR-41, Generic Saddle Fusion J oining Procedure for Polyethylene Gas Piping.

(h) Rain, cold, and windy weather conditions can influence fusion quality. Modification of therecommended heating time in the procedure should be given consideration during such conditions.

(i) For hot taps on PE, see the guide material under 192.123.(j) The condition of equipment for heat fusing PE must conform to the equipment manufacturer's

recommended tolerances for acceptable wear of critical components. The use of damaged or wornequipment may result in fusion joints that are weak or out of alignment. The frequency of inspectionshould be determined by the operator based on equipment usage, equipment age and condition,and manufacturer's recommendation. See Guide Material Appendix G-192-20 for a sampleinspection form.

3.3 Heat-fusion by electrofusion. (Plastic-to-plastic)(a) Sections 192.273 and 192.283 require that procedures for making joints other than by welding be

written and qualified. Each electrofusion equipment manufacturer is a source of appropriateprocedures for their respective system. The operator should check state requirements on the use of electrofusion. Generally each procedure should contain some or all of the following elements:(1) Couplings.

(i) The pipe should be cut at square angles.(ii) The pipe should be marked with the proper stab depth for the fitting.(iii) Surface oxidation should be removed from the area of the pipe to be fused, up to the

stab-depth marks, using the tool specified in the qualified procedure.(iv) One end of the pipe should be secured in an appropriate clamping device, the fitting slid

onto pipe, the second piece of pipe placed into clamp, and the fitting slid onto each pipeso it is properly aligned. Insertion up to the stab-depth marks should be ensured.

(v) The control box should be tested for proper function.(vi) The fitting should be connected to the fusion control box and the cycle activated. The

fitting should be left in the clamp until cooling has been completed.

(vii) The joint should be inspected in accordance with 192.273.(2) Sidewall fittings.(i) Determine the pipe area where the fitting is to be fused.(ii) All surface oxidation should be removed from the pipe in the area to be fused using the

tool specified in the qualified procedure.(iii) The fitting should be positioned and clamped in the cleaned area.(iv) The control box should be tested for proper function.(v) The fitting should be connected to the fusion control box and the cycle activated. The

fitting should be left in the clamp until cooling has been completed.(vi) The joint should be inspected in accordance with 192.273.


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(b) The following are references for joining plastic pipe by electrofusion.(1) ASTM F 1055, "Standard Specification for Electrofusion Type Polyethylene Fittings for Outside

Diameter Controlled Polyethylene Pipe and Tubing."(2) ASTM F 1290, "Standard Practice for Electrofusion J oining Polyolefin Pipe and Fittings."(3) PPI Technical Committee Project 141, "Standard Practice for Electrofusion Joining Polyolefin

Pipe and Fittings."

3.4 Adhesive for thermosetting pipe only. (Plastic-to-plastic)(a) The mating surfaces should be suitably prepared and should be dry and free of material that might

be detrimental to the joint.(b) Adhesive should be properly mixed and liberally applied on both mating surfaces. The assembled

joint should be held together in alignment for sufficient time to prevent the pipe or tubing frombacking out of the fitting.

(c) The assembled joint should not be disturbed until the adhesive has properly set. The joint should notbe subjected to a pressure test until it has developed a high percentage of its ultimate strength. Thetime required for this to occur varies with the adhesive, humidity, and ambient temperature.

(d) To accelerate curing, an adhesive bonded joint may be heated in accordance with themanufacturer's recommendation.

3.5 Mechanical for all plastic piping. (Plastic-to-plastic and plastic-to-metal)(a) When compression type mechanical joints are used, the elastomeric gasket material in the fitting

should be compatible with the plastic; that is, neither the plastic nor the elastomer should causedeterioration in chemical or mechanical properties to the other over a long period.

(b) A stiffener is required for thermoplastic piping. The tubular stiffener required to reinforce the end of the pipe or tubing should extend at least under that section of the pipe compressed by the gasket orgripping material. The stiffener should be free of rough or sharp edges that could damage thepiping. Stiffeners that fit the pipe or tube too tightly or too loosely may cause defective joining. Theoperator should check with the manufacturer for recommendations.

(c) The pull-out resistance of compression-type fittings varies with the type and size of the fitting andthe wall thickness of the pipe being joined. ASTM D 2513 describes requirements for threecategories of mechanical fittings.(1) Category 1 full seal, full restraint. These types of mechanical fittings, when properly installed,

are designed to provide a joint that is stronger than the piping being connected.(2) Category 2 full seal, no restraint.(3) Category 3 full seal, partial restraint.

(d) All mechanical joints should be designed and installed to effectively sustain the longitudinal pull-outforces caused by contraction of the piping and by maximum anticipated external loading. Tominimize these forces, practices such as the following should be used.(1) With direct burial, snaking the pipe in the ditch when the pipe is sufficiently flexible.(2) With insertion in a casing, pushing the pipe into place so that it is in compression rather than

tension.(3) Allowing for the effect of thermal expansion and contraction of installed pipe due to seasonal

changes in the temperature. The importance of this allowance increases with the length of theinstallation. This allowance may be accomplished by the following:

(i) Offsets.(ii) Anchoring.(iii) Strapping the joint.(iv) Placing the pipe in slight axial compression.(v) Expansion-contraction devices.(vi) Fittings designed to prevent pull-out (ASTM D 2513, Categories 1 and 3).(vii) Combinations of the above.

This allowance is of paramount importance when the plastic pipe is used for insertion insideanother pipe because it is not restrained. Coefficients of thermal expansion for thermoplasticmaterials determined using ASTM D 696 are listed in Table 192.281i.


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Add endum

AGA - Gas Transmission and Distribution Piping Systems

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Transcript of AGA - Gas Transmission and Distribution Piping Systems