Steel Piping and Fittings for Refrigeration...

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Star Standard Specification No. 24

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Steel Piping and Fittings for Refrigeration Duties

Introduction The purpose of this standard is to bring together the information relative to design, manufacture and installation of refrigeration carbon and stainless steel pipework on all Star specified refrigeration equipment. The application of thin wall stainless steel (TWSS) piping and fittings for glycol and water duties and for pressure relief discharge lines are treated as special cases and are covered in Star Standard Specifications No. 150 and 156. On contracts where an application standard is specified by a client or by an inspecting authority on a client‟s behalf that standard will take precedence over the Star standard. Pressure testing on vessels and packaged unit piping will be carried out in accordance with Star Standard Specifications No‟s 113 and 125. This specification covers:

Section Title

1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7

Steel Pipe and Fittings Pipe Specification Pipework Design and Allowable Pressures Butt Weld Fittings Socket Weld Fittings Flanges Saddle Bosses Purchasing Requirements

2.0 2.1 2.2 2.3 2.4

Installation Standards, Welding Standards and Welding Processes Installation Standards Welding Standards Welding Processes Inspection

3.0 3.1 3.2

Screwed Joints and Compression Fittings Screw Thread Joints Compression Fittings

4.0 4.1 4.2

Refrigeration Valves and Controls Refrigeration Stop Valves Bore Match



1.0 Steel Pipe and Pipe Fittings for Welded Pipework

1.1 Pipe Specification 1.1.1 Carbon Steel Pipe Specification 1.1.1.1 The selection of material specification for carbon steel pipe will be taken from Figure 1 of

this standard. In general, the pipe material specification used in Star installations and units will be ASTM A106 GR.B or ERW API5L (where available). Where we are using carbon steel and where the working conditions are such that there will be a combination of high pressure (i.e. above 4 Bar (G)) and low temperature (i.e. below –29.0ºC) the pipe material used will be ASTM A333 GR6. Where the pressure is less than 4 Bar (G) ASME B31.3 allows the use of ASTM A106B

material down to -45C. 1.1.1.2 The pipe dimension specification for pipe from 17.1mm OD (3/8” NB) to 168.3mm OD (6”

NB) will be ANSI B.36.10 Sch 40 (BS1600) with the following dimensions and weights:

Table for ANSI.B.36.10: Sch 40 (BS1600)

Outside Diameter

mm

Nominal Bore ins

Wall Thickness mm

Weight kg/m

17.1 3/8” 2.3 0.84

21.3 ½” 2.8 1.28

26.7 ¾” 2.9 1.7

33.4 1 3.4 2.52

42.2 1¼” 3.6 3.43

48.3 1½” 3.7 4.07

60.3 2 3.9 5.42

73.0 2½” 5.2 8.69

88.9 3 5.5 11.31

114.3 4 6.0 16.02

141.3 5 6.6 21.92

168.3 6 7.1 28.22

For pipe 219.1mm OD (8” NB) or above, Sch 20 will be specified with the following

dimensions and weights:

Table for ANSI.B.36.10: Sch 20

Outside Diameter

mm

Nominal Bore ins

Wall Thickness mm

Weight kg/m

219.1 8 6.4 33.57

273.0 10 6.4 42.09

323.9 12 6.4 50.11

356.6 14 7.9 67.74

406.4 16 7.9 77.63

457.0 18 7.9 87.49



1.1.1.3 Screwed pipework and fittings to EN10255:2004 (formerly BS 1387) and BS3799 may be used for water, brine and glycol pipework with design pressures up to 10 Bar(G).

Caution: Where pipework to EN10255 and fittings to BS EN10253-1 and BS EN10253-2

(formerly BS 1965) (“Blue Band” pipework) are to be used they must be selected to give correct matches on bore and outside diameter to satisfy the welding specifications.

1.1.1.4 To comply with the painting specification we may choose to purchase pipework in a

cleaned and primed condition. If different grades of pipework are to be used on the same project they should be pre-primed in different colours to avoid confusion and mistakes on site.

1.1.1.5 Mapress pipework system may be used for small bore low pressure drains. 1.1.2 Stainless Steel Pipe Specification 1.1.2.1 The stainless steel material specification shall be ASTM A312 grade 316L or 304L.

1.2 Pipework Design and Allowable Pressures 1.2.1 Allowable Pressures for Carbon Steel Pipe 1.2.1.1 Table of carbon steel pipe diameters up to 150NB and maximum allowable pressures

Nominal Pipe Size

(ins)

Nominal Pipe Size

(mm)

API5L GrB ASTMA106

& A333 Gr 6

Sch 40 Bore (mm)

Maximum Allowable Pressure

(Bar(G))

API5L GrB ASTMA106

& A333 Gr 6

Sch 80 Bore (mm)


(Bar(G))

⅜ 10 12.5 403 10.7 544

½ 15 15.80 313 13.9 422

¾ 20 20.96 260 18.9 354

1 25 26.64 244 24.4 328

1¼ 32 35.08 204 32.4 278

1½ 40 40.94 184 38.1 254

2 50 52.48 156 49.3 222

2½ 65 62.70 170 59.0 232

3 80 77.92 149 73.7 207

4 100 102.30 127 97.1 192

5 125 128.20 112 122.3 163

6 150 154.08 102 146.3 157



1.2.1.2 Table of carbon steel pipe diameters 200NB and above maximum allowable pressures

Nominal Pipe Size

(ins)

Nominal Pipe Size

(mm)

API5L GrB ASTMA106

& A333 Gr 6

Sch 20 Bore (mm)


(Bar(G))

API5L GrB ASTMA106

& A333 Gr 6

Sch 40 Bore (mm)


(Bar(G))

8 200 206.30 70 202.7 90

10 250 260.20 56 254.4 82

12 300 311.10 47 303.3 77

14 350 339.80 54 333.4 76

16 400 390.60 47 381.0 75

1.2.2 Allowable pressures for stainless steel pipe Table of stainless steel pipe diameters up to 300NB and maximum allowable pressures

Nominal Pipe Size

(ins)

Nominal Pipe Size

(mm)

304L & 316L

Sch 40

Bore (mm)


(Bar(G))

304L & 316L

Sch 80

Bore (mm)


(Bar(G))

½ 15 15.80 260 13.9 364

¾ 20 20.93 212 18.9 286

1 25 26.64 198 24.4 274

1¼ 32 35.05 163 32.4 228

1½ 40 40.90 147 38.1 207

2 50 52.50 124 49.3 179

2½ 65 62.71 135 59.0 188

3 80 77.92 117 73.7 166

4 100 102.26 99 97.1 144

5 125 128.20 87 122.3 129

6 150 154.05 79 146.3 124

8 200 202.72 70 193.6 110

10 250 254.5 63 247.6 87

12 300 304.8 54 298.4 73

1.2.3 General Arrangement All pipework between anchors or other restraint points (eg connections and branches)

shall be arranged and supported to allow normal movement due to expansion and contraction without the need for expansion joints. All connections are to be made to headers and equipment using formed fittings, except as below:

1.2.4 Cold Formed Bends Cold formed bends, instead of forged bends, will be allowed on carbon steel pipework

40NB or less.



1.2.5 Stab-ins Stab-ins will be allowed according to the following Table and notes, provided the branch

size is greater than 25NB. The designs include a 10% allowance to cover system pressure tests at 1.1 times the

allowable pressure and a further safety factor of 10%.

Table of maximum allowable stab in sizes

Header NB

Maximum Branch Size NB

Allowable Pressure/Application

52.0 Bar (G) and 65.0 Bar (G)

(1)

25.5 Bar (G) 10.0 Bar (G) on

Glycol

300 125 150 200

250 100 150 200

200 100 125 150

150 80 100 125

125 80 80 100

100 65 65 80

80 50 50 65

65 40 40 50

50 32 32 40

Notes (1) For the case of 52.0 Bar (G) and 65.0 Bar (G) allowable pressure, all pipes (ie both header and

branch) will be SCH 40 thickness regardless of diameter whereas for the other cases SS53 Sizing of Refrigerant Pipe Lines allows SCH 20 thicknesses for header and branch pipe sizes 200 NB and above.

(2) All branches will be perpendicular to the header and on the centre line. (3) A full penetration weld as per Star standard drawing 1903-001 type C or type E is required. (4) Olets will be allowed, instead of T pieces, for branches of 25NB or less where the main pipe is at least two

standard pipe sizes larger than the branch.

Where stab-in branch connections are permitted, the end of the branch pipe shall be shaped to match the internal curvature of the header pipe and the protrusion into the header pipe shall be 3mm all round, not significantly more. Refer to example figures below (extract from BS 2633).

Root run to be dressed to clean metal then seal welded.

Root run to be dressed to clean metal then seal welded.

(a) Single-bevel preparation (b) Single-J preparation

Figure g f (max.) l r

mm mm mm mm

(a) 1.0 2.5 - -

(b) 1.0 3.0 3.0 5.0

Typical preparation and assembly of stab-in branches



1.2.6 Minimum Distance Between Welds The minimum distance between the „toe‟ of adjacent welds shall be 25mm. Where this is impractical, this should be agreed with the Production Department on a case by case basis.

1.2.7 Pipe Closures Welded dished end caps shall be used for closures at ends of all refrigerant pipework.

Flat closures are not allowed. 1.3 Butt Weld Pipe Fittings 1.3.1 Carbon steel fittings

The selection of material specification for butt welded pipe fittings, bends, tees, reducers and caps will be taken from Figure 1 of this standard.

In general, the material specification for carbon steel butt welded pipe fittings, bends,

tees, reducers and caps used in Star installations and units will be ASTM A234 WPB where the pipe is ASTM A106 Gr B or ERW API 5L.

Where the working conditions are such that there will be a combination of high pressure

(i.e. above 4 Bar (G)) and low temperature (i.e. below –29.0ºC), the material used will be ASTM A420 WPL6 in all cases where the pipe is ASTM A333 Gr 6.

1.3.1.1 The dimensions of all butt weld fittings will confirm to ANSI B16.9 (BS1640). For all pipe

work from 42.2mm OD (1¼” NB) to 168.3mm OD (6” NB) Sch 40/STD fittings for pipework will be specified. For 219.1mm OD (8” NB) and above, Sch 20 fittings will be specified.

1.3.2 Stainless steel fittings In general, the material specification for stainless steel butt welded pipe fittings, bends,

tees, reducers and caps will be ASTM A403.

1.4 Socket Weld Fittings 1.4.1 Carbon steel socket weld fittings

Socket weld fittings will be used for all pipework up to and including 48.3mm OD (1½” NB) where practical. For the avoidance of doubt, it is not considered practical to use socket weld fittings on DIN Standard pipework. The dimensions of the fittings will conform to ANSI B16.11 (BS3799). The selection of material will be taken from Figure 1. In general, the fitting material will be ASTM A105. The rotor oil feed pipework on Vilter compressor packs will be a special exception and butt welded as standard. Contract specific requests for butt weld connections will take precedence over the requirement for socket weld fittings in this specification. Where working conditions are such that there will be a combination of high pressure (over 4 Bar(G)) and low temperature (below –29.0ºC), the material used will be ASTM A350GR.LF2. Note: Where the end of a pressure carrying pipe is to be sealed, a standard butt weld

or socket weld cap fitting must be used.



1.4.2 Stainless steel socket weld fittings

Socket weld fittings material will be ASTM A182.

1.5 Flanges 1.5.1 Carbon steel flanges 1.5.1.1 All flanges will be to ASME B16.5 (equivalent to BS 1560 or its direct replacement BS EN

1759-1) Class 300 (unless higher pressure is required or DIN flange to suit line component). The format of the flanges for pipe sizes up to and including 33.4mm OD will be socket weld raised face and from 42.4mm OD slip on raised face.

1.5.1.2 The selection of material will be taken from Figure 1. In general, flange material will be

ASTM A105. Where the working conditions are such that there will be a combination of high pressure (above 4 Bar(G)) and low temperature (below –29.0ºC), the flange material used will be ASTM A350 LF2.

1.5.1.3 Flange bolt hole dimensions are given in imperial units only in ASME B16.5. However, BS 1560 and BS EN 1759-1 (equivalent to ASME B16.5) do not preclude the use of metric bolts and provide tables of comparable imperial and metric nominal bolt sizes. Due to better availability, Star specify metric bolting as standard. Several similar standards are available which apply to metric bolts. Due to better availability, Star specify metric bolting in accordance with DIN-931 – M1.6 to M39 Hexagon Head Bolts, Screws and Nuts. Acceptable alternative standards are BS EN ISO 4014 – Hexagon Head Bolts (direct equivalent of DIN 931) and BS 3692 – ISO Metric Precision Hexagon Bolts, Screws and Nuts. Bolts for use in systems with design temperatures down to -50°C shall have mechanical properties compliant with grade 8.8 of BS EN ISO 898-1 – Mechanical Properties of Fasteners Made of Carbon Steel and Alloy Steel. Several similar standards are available which apply to metric nuts. Due to better availability, Star specify metric nuts in accordance with DIN 934 – Hexagon Nuts with Metric Coarse and Fine Pitch Thread. Acceptable alternative standards are BS EN ISO 4032 and 8673 (direct equivalents of DIN 934) and BS 3692 – ISO Metric Precision Hexagon Bolts, Screws and Nuts. Nuts shall have mechanical properties compliant with grade 8 of ISO 898-2 (identical properties are also given in BS 3692). Marking of bolts and nuts shall be in accordance with BS EN ISO 898-1 (bolts) and BS EN ISO 898-2 (nuts). Where bolts and nuts are specified to DIN standards, the marking requirements of DIN 267 are acceptable (similar to ISO 898 parts 1 and 2). Bolts for use in systems with design temperatures below -50°C shall have mechanical properties compliant with grade A2 – 70 of BS EN ISO 3506-1 – Mechanical Properties of Corrosion Resistant Stainless Steel Fasteners, Bolts, Screws and Studs. Nuts shall have mechanical properties in accordance with BS EN ISO 3506-2.



Comparable metric and imperial bolt sizes are given in the table below (as given in BS EN 1759).

Imperial ½ ⅝ ¾ ⅞ 1 1⅛ 1¼ 1⅜ 1½

Metric M14 M16 M20 M24 M27 M30 M33 M36 M39

The following table shows the bolt sizes to use for Class 150, 300 and 600 flanges. Imperial sizes are also given for information.

Nominal Flange Size

Nominal Diameter of Bolts

Class 150 Class 300 Class 600

mm ins Metric Imperial Metric Imperial Metric Imperial

15 ½ M14 ½ M14 ½ M14 ½

20 ¾ M14 ½ M16 ⅝ M16 ⅝

25 1 M14 ½ M16 ⅝ M16 ⅝

32 1¼ M14 ½ M16 ⅝ M16 ⅝

40 1½ M14 ½ M20 ¾ M20 ¾

50 2 M16 ⅝ M16 ⅝ M16 ⅝

65 2½ M16 ⅝ M20 ¾ M20 ¾

80 3 M16 ⅝ M20 ¾ M20 ¾

100 4 M16 ⅝ M20 ¾ M24 ⅞

125 5 M20 ¾ M20 ¾ M27 1

150 6 M20 ¾ M20 ¾ M27 1

200 8 M20 ¾ M24 ⅞ M30 1⅛

250 10 M24 ⅞ M27 1 M33 1¼

300 12 M24 ⅞ M30 1⅛ M33 1¼

350 14 M27 1 M30 1⅛ M36 1⅜

400 16 M27 1 M33 1¼ M39 1½

Where use of imperial bolting is a strict customer requirement then the applicable standard must be agreed with the customer and Star‟s Production Department. Where strict compliance with ASME B16.5 is specified, then for applications with a minimum design temperature no lower than -48°C, mechanical properties shall be compliant with ASTM A193 Grade B7 and for lower temperature applications mechanical properties shall be compliant with ASTM A320 Grade L7. Bolts should be specified in accordance with ASME B18.2.1 and nuts should be specified in accordance with ASME B18.2.2.

1.5.2 Stainless steel flanges

1.5.2.1 Flange material will be ASTM A182.

1.6 Pipe Saddle Bosses (e.g. Weldolets/Threadolets) 1.6.1 Carbon steel bosses 1.6.1.1 Saddle Boss fittings will be used on all pipe work where a screwed stud coupling or

threaded insert is to be fitted.



1.6.1.2 The dimensions of saddle fittings will be to ANSI B31.1

In general, the saddle fittings material specification used in Star installations and units will be ASTM A105.

Where working conditions are such that there will be a combination of high pressure (i.e. above 4 Bar(G)) and low temperature (i.e. below –29.0ºC), the material will be ASTM A350 LF2.

1.6.1.3 The thread of the fitting will be ANSI B1.20.1 National Standard Tape Pipe Thread NPT. 1.6.1.4 If a non standard boss is required on an installation it will be manufactured from bar material BS970 080A15. 1.6.2 Stainless steel bosses Boss material will be ASTM A182.

1.7 Purchasing Requirements 1.7.1 All orders for the following carbon steel material grades will state our requirement for a

maximum carbon content (C MAX) of 0.25%: Pipe Butt Weld Fitting ASTM A106 GRB ASTM A234 WPB ERW API5L ASTM A333 GR6 ASTM A420 WPL6 Forgings, Flanges, Socket Fittings, Saddle Fittings ASTM A105 ASTM A350LF2 1.7.2 Material Certification

Material certification for all pipe, fittings and flanges is required. The material must be marked with the test certificate reference to ensure conformity and traceability. The certificates will be filed with the installation records by the Branch Manager or, in the case of package units, by the Works Office.

1.7.3 Painting

All carbon steel pipe purchased for Star installations and units will be externally cleaned and prime painted. The work may be carried out by the pipe stockist on our behalf. Alternatively, the purchaser may arrange for this work to be carried out by a third party.

1.7.3.1 Paint Specification

All carbon steel pipe will be shot blasted externally to a minimum standard SA2½ (BS7079). After blast cleaning all pipes will be blown clear. After cleaning, the pipe is to be capped and externally painted with one 20 micron coat of METAGARD G250 red oxide primer for A106 pipe and grey oxide primer for A333 pipe (W & J Leigh & Co) or alternative material agreed in writing on a contract specific basis. The pipe will be identified with the material certificate reference number.



2.0 Installation Standards, Welding Standards, Welding Processes and Inspection

2.1 Installation Standards 2.1.1 The application standards for all carbon steel pipe work on Star installations and

package units is dependent on the system design and will be as follows:

System Design Pressure According to the Diagram of Connections

Application Standard

Up to and including 17 Bar (G)

BS2971 1991 Class II Category A. ARC welding of carbon steel pipework for carrying fluids

Over 17 Bar (G)

BS2633:1987 Class I. ARC welding of carbon steel pipework for carrying fluids

For all primary refrigerant stainless steel pipework above a system design pressure of 8 Bar (G) the application standard shall be BS EN ISO 5817-2014 (Welding – fusion welded joints in steel, nickel, titanium and their alloys – quality level C). For lower pressure primary refrigerant stainless steel pipework or for secondary fluids refer to Star Standard Specifications 150 and 156.

2.2 Welding Standards 2.2.1 All welding on pressure carrying pipework on Star installations and package units will

be carried out to verified procedures to BS EN288, Pt 3:1992 - Specification and qualification of welding processes for metallic materials or its direct replacement BS EN ISO 15614-1 : 2004. Other recognised standards may be used if it is agreed in writing with Star‟s Production Department on a contract specific basis. The procedures will cover the range and type of welds required for the pipework being welded.

2.2.2 All welders working on pressure carrying pipework on Star installations and units will

have current verified approval to BS EN287, Pt 1:1992 (or 2001) - Qualification testing of welders for fusion welding. The approvals will cover the range and type of welds required for the pipework being welded.

2.2.3 Other national welding standards such as ASME VIII may be accepted, provided

welding procedures and current qualifications of the welders cover the range and type of welds required for pipework being welded.

Where it is proposed that an alternative standard is used, this should be agreed with the Technical Department and the accredited inspection authority where appropriate.

2.3 Welding Processes 2.3.1 All butt welded joints will be rooted using tungsten inert gas arc welding (TIG). The

welds will be completed using TIG or manual metallic arc welding (MMA). 2.3.2 Oxyacetylene welding is not allowed.



2.4 Inspection 2.4.1 Requirements The requirements in this section are the minimum to be used on Star installations and

packaged units. The requirements apply to all welded pipe including relief valve vent pipework, glycol and water piping (refer to Standard Specifications 150 and 156 for inspection requirements where the water, glycol or relief valve vent pipework is thin wall stainless steel).

2.4.1.1 Visual inspection of all pipework welds to ensure conformity with the requirements of

the application standard being used. 2.4.1.2 Non destructive inspection of butt welds will be carried out. The percentage of welds

subjected to non destructive inspection will be as follows: Application Standard

BS2633:1987 10% of each welders production of butt welds

BS2971:1991 10% of each welders production of butt welds

BS EN ISO 5817:2014 (for stainless steel) 10% of each welders production of butt welds

In addition to the above inspection requirements, all butt weld and socket weld end caps on headers and distribution manifolds on hot gas defrost pipework will be subjected to non destructive inspection (NDI). 2.4.1.3 Radiographic inspection to BS2910 or its direct replacement BS EN ISO 17636-2:

2013 will be used for butt welds. Ultrasonic inspection to BS3923 Pt 1 or its direct replacement BS EN ISO 17640 : 2010 may be used, provided the procedure used is suitable for the material thickness being inspected. Other recognised standards may be used if it is agreed in writing with Star‟s Production Department on a contract specific basis. For socket welded joints where inspection is required, Magnetic Particle Inspection (MPI) will be used.

2.4.1.4 Defect limitation and any rectification work required will be in accordance with the

application standard being used for the inspected pipework. 2.4.1.5 All non destructive inspection will be carried out to approved procedures and the

interpretation of the inspection report will be by qualified personnel.



2.4.2 Records 2.4.2.1 A weld identification record will be created each time a non destructive inspection is

carried out. The record will have the following information: 1. Star order number and job number 2. Application standard to be used for interpretation of NDI results 3. Weld identification reference 4. Weld location – this may require a location sketch. 5. Welder‟s identification reference 2.4.2.2 All non destructive test records and radiographs will record: 1. Date 2. Job number 3. Weld identification reference 4. Welder identification reference 2.4.2.3 The weld identification record and the non destructive inspection records will be filed

together and kept with the installation records by the Branch Manager or package unit records by the Works Office.

2.4.2.4 It has been agreed with Lloyds that there is no requirement to retain a copy of the

radiograph. However, this will be retained for all petrochemical contracts.

3.0 Screwed Joints and Compression Fittings

3.1 Screw Thread Joints Screw thread joints will be used in conjunction with stud couplings, gauge and

instrument valves and small bore pipework. In general, the screw thread will be ANSI B1.20.1 NPT.

3.2 Compression Fittings 3.2.1 Use of compression fittings will be restricted to pipe sizes 42mm OD and below. 3.2.2 The fitting used will be to DIN 2353 and will be steel L Series. The preferred

compression fittings will be Ermeto EO Range – L Series. An alternative and interchangeable fitting is EMB – L Series. 3.2.3 The preferred size range of compression fittings will be: 10mm ¼” NB approx 28mm ¾” NB approx 15mm 3/8” NB approx 35mm 1” NB approx 22mm ½” NB approx 42mm 1¼” NB approx 3.2.4 Metric OD pipe for use with DIN Standard L Series fitting will be to DIN2391/C material

ST35.4/ST37.4.



3.2.5 Pipe dimensions will be:

OD Wall Thickness (minimum)

10 2.0

15 2.0

22 2.5

28 3.0

35 3.0

42 4.0

3.2.6 The assembly and installation of compression fittings will be in accordance with the

manufacturer‟s recommendations.

4.0 Refrigeration Valves and Controls 4.1 Refrigeration Stop Valves The selection of stop valve format for welded pipework is applicable for the

DANVALVE, Robinet and other similar valve ranges. 4.1.2 The selection of valve terminations will be as follows:

Pipe Size Valve

Size

Termination

Format

Weld

Type OD mm NB ins

17.1 3/8 10 ANSI B.16.11 Socket

21.3 ½ 15 ANSI B.16.11 Socket

26.7 ¾ 20 ANSI B.16.11 Socket

33.4 1 25 ANSI B.16.11 Socket

42.2 1¼ 32 ANSI B.16.11 Socket

48.3 1½ 40 ANSI Sch 40 Butt

60.3 2 50 ANSI Sch 40 Butt

73.0 2½ 65 ANSI Sch 40 Butt

88.9 3 80 ANSI Sch 40 Butt

114.3 4 100 ANSI Sch 40 Butt

141.3 5 125 ANSI Sch 40 Butt

168.3 6 150 ANSI Sch 40 Butt

219.1 8 200 ANSI Sch 20* Butt

278.0 10 250 ANSI Sch 20* Butt

300.0 12 300 ANSI Sch 20* Butt

350.0 14 350 ANSI Sch 20* Butt

*Note that for Robinet (RFF) valves, these are not available with ANSI Sch 20 connections and so should be specified with DIN connections which more closely matches the bore of the Sch 20 pipework.

4.1.3 Seal Caps

All manually operated stop valves will be fitted with seal caps regardless of refrigerant unless specified otherwise on a contract specific basis. On low temperature insulated pipework where polystyrene, polyurethane or similar is used, the valves will have an extended spindle or long bonnet and seal cap.



4.2 Bore Match The matching of the bore of a valve or a mating flange must be checked to ensure

that the bore variation is generally in line with the application. In some cases we may choose to fit a transition piece so that a butt weld will conform to the requirements of the application standard. Alternatively, the works may choose to machine the flange to suit the pipe.

4.2.1 Typical limits for bore difference and alignment using TIG welding with a root gap:

Over Up to and including

BS2633(1) BS2971(2)

-

100

300

100

300

-

1.0mm

1.5mm

2.5mm

-

150

150

-

3.0

5.0 (1)

Class I arc welding of ferritic steel pipework for carrying fluids – use when design pressure is greater than 17 Bar (G) (refer to section 2.1.1). (2)

Class II arc welding of carbon steel pipework for carrying fluids – use when design pressure is less than or equal to 17 Bar (G) (refer to section 2.1.1).



Date Issue Originator Changes Sections Affected

August 1995 1 DMF

July 1998 2 DJH

May 2000 3 DJH

March 2001 4 DJH

July 2002 E DJH

October 2003 F DJH

05/07/06 G DJH Now includes designs to 65.0 bar allowable pressure. 25.5 bar stab-in into 100NB header now limited to 65NB (was 80NB). Socket weld fittings allowed up to 48.3mm OD (was 33.4mm OD). OD for 12” pipe size corrected to 323.9mm. Revision table now includes a list of latest changes. Details of bolting material added.

1.2.3 1.2.3 1.4 Table 1B 1.5.3

09/05/07 H DJH Pressure and temperature limits on use of ASTM A106 Gr B clarified

1.1.1 and Figure 1

08/10/09 I DJH 32NB valve now listed as a socket weld type.

4.1.2

08/10/09 I DJH Allowable pressures for carbon and stainless steel pipe added

1.2.1 and 1.2.2 and subsequent sections renumbered

08/10/09 I DJH Reference to SS150 added Introduction

08/10/09 I BC Material specification for stainless steel pipe and fittings added.

1.1.2, 1.3.2, 1.5.2, 1.6.2

0/10/09 I DJH Tables of ANSI B.36.10 pipes and dimensions and weights moved to section 1.1.

1.1

18/03/13 J RWT Wording of introduction modified Introduction

18/03/13 J RWT Reference to updated specs added to section 1.1.1.3

1.1.1.3

18/03/13 J RWT Nominal pipe sizes corrected in tables in sections 1.2.1.1 and 1.2.2

1.2.1.1 and 1.2.2

18/03/13 J RWT Distance between branches updated 1.2.5 and 1.2.6

18/03/13 J RWT Wording of section 1.4.1 modified to add “where practical”

1.4.1

18/03/13 J RWT Guidance on Vilter compressor oil feed pipework added

1.4.1

18/03/13 J RWT Reference to updated specs added to section 1.5.1.3

1.5.1.3

18/03/13 J RWT Clarification of paint colours for A106 pipe and A333 pipe

1.7.3.1

18/03/13 J RWT Reference to alternative welding codes added

2.2

18/03/13 J RWT Reference to SS150 and SS156 added 2.4.1

18/03/13 J RWT Reference to alternative NDT specifications added

2.4.1.3

18/03/13 J RWT Note added concerning RFF valves 4.1.2

18/03/13 J RWT Requirement added that all stop valves are capped

4.1.3

18/03/13 J RWT Refrigeration controls section completely removed

4.1.3

18/03/13 J RWT Figure 2 removed Figure 2

10/03/14 K RWT Example stab in branch detail added 1.2.5

10/03/14 K RWT Note added covering DIN piping 1.4.1

10/03/14 K RWT Bolting section re-written for clarification 1.5.1.3

10/03/14 K RWT Reference to application standard ISO 5817 added for stainless steel

2.1.1 & 2.4.1.2



PIP

E:

AS

TM

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PIPE: ASTM A333 Gr6

FITTINGS: ASTM A420 Gr.WPL 6

FLANGES SOCKETS: ASTM A350 LF2

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Steel Piping and Fittings for Refrigeration...

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Transcript of Steel Piping and Fittings for Refrigeration...