API Purchasing Guide Cabezales

8/19/2019 API Purchasing Guide Cabezales

http://slidepdf.com/reader/full/api-purchasing-guide-cabezales 1/16

API 6A 20th EditionPurchasing Guide forPressure Control Wellhead and Christmas Tree EquipmentIncluding changes in NACE MR0175/ISO 15156 latest edition

GE Oil & GasDrilling & Production



Table of Contents

Changes to API 6A .......................................................................1 • Annex J - Repair and Remanufacture Equipment

Accessory Equipment in API 6A ............................................... 2 • Bull Plug and VR Plug Specifications

• VR Plug Threads

• Back Pressure Valve Specications

• Service Tool Specifications

Ordering API 20th Edition Products ........................................ 3 • Five Criteria for Ordering

API Temperature Class .............................................................. 4 • Considerations for Ordering

• Equipment for High Temp Service (above 250°F)

API Material Class ...................................................................... 5 • NACE MR0175/ISO 15156 Changes

• API Material Classes per API 6A Section 4.2.3.3

• H2S and CO

2 Partial Pressure

• Trim Selection

Product Specification Level ...................................................... • What are PSL’s and What are They for?

• What Parts do PSL’s Cover?

• PSL Decision Criteria

• PSL Decision Tree

• QC Requirements for Manufacture and TestingPSL 1-4 Equipment

Performance Requirements ...................................................1 • Cycle Testing of Designs



API 6A 20th Edition

Purchasing Guide1

Changes to API 6A

Annex J — Repair and RemanufactureEquipment Repair and remanufacture equipment has been incor-porated into API 6A 20th Edition/ISO 10423.



2

Accessory Equipment in API 6A

Bull Plugs and VR (Valve Removal) Plugs • Material qualification

• Tensile and hardness testing

• Impact testing – For PU combination temperature range, impact

testing is performed at -20°F

• Job lot traceability

• API specified hex head required on allVR plugs

• API VR Plug design for 15M - 20M service with APIACME thread and metal-to-metal seal

VR (Valve Removal) Threads • 1-13/16” 10M must use 1-1/4” line pipe

• 2-1/16” to 4-1/16” 2M - 10M must use API Sharp

Vee thread • 1-13/16” to 3-1/16” 15M - 20M must use API

ACME thread and metal-to-metal seal

Prior to the 19th edition of API Spec 6A, eachmanufacturer produced a VR preparation.

This created a potential problem for

identifying the proper thread in the outlet.

Back Pressure Valves • Material qualification same as PSL 3 tubing

hangers


• Impact testing • Job lot traceability

• Hydrostatic testing required

Running, Retrieving and Testing Tools • Material qualification


• Impact Testing

Many tools currently in use may not

comply with API standards.

Wear Bushings and Clean-Out Tools • Tensile and hardness testing

• Impact testing of clean-out tools

• High hardness requirements for wear bushings

Many bushings and tools currently in use

may not comply with API standards.



API 6A 20th Edition

Purchasing Guide3

Ordering API 20th Edition Products

Five Criteria for Individual Parts(i.e. valves, hangers, etc.)

1. Temperature Class — API holds the user

responsible for choosing temperature class

2. Special Temperature Classes (New to API 20th

Edition) — Can be designated where low and hightemperatures are specied

3. Material Class — API holds the user responsible for

choosing material class

4. PSL (Product Specification Level) — API

recommends PSL’s to the user

5. PR (Performance Requirement) — API minimum oradded optional cycle testing of designs

Examples of What These Designations Meanin the Description of a Part

API 6A-U-AA-1-1

U 0°F to 250°F (-18°C to 121°C)

AA General service with H2S partial pressure <

0.05 psi and non-corrosive with CO2 partial

pressure < 7 psi

1 PSL 1 per API recommendations forcustomer order

1 PR1 (minimum level) API cycle testing hasbeen completed on the design

API 6A-PU-EE-0,5-3-2 PU -20°F to 250°F (-29°C to 121°C)

combines P (-20°F to 180°F or-29°C to 82°C) and U (0°F to 250°F or

-18°C to 121°C)

EE-0,5 NACE sour service with maximum0.5 psi H

2S partial pressure and mildly

corrosive with CO2 partial pressure from

7 psi to 30 psi

3 PSL 3 per API recommendations forcustomer order

2 PR2 (2nd level) API cycle testing has beencompleted on the design

Special Temperature Ranges — API 6A-0-300-EE-NL-3G-2

0-300 0°F to 300°F (-18°C to 149°C)EE-NL NACE sour service with no limit H

2S partial

pressure and mildly corrosive with CO2

partial pressure from 7 psi to 30 psi

3G PSL 3 with additional gas test per APIrecommendations for customer order

2 PR2 (2nd level) API cycle testing has beencompleted on the design

Note: When ordering,

please specify at leastthe first three of the ve

criteria.



4

Considerations for Ordering • Equipment is rated for service in a specific

temperature range or ranges – Maximum production flowing temperature – Mud circulating temperature? – Minimum seasonal temperature

• Temperature classes

– K -75°F to 180°F (-60°C to 82°C) – L -50°F to 180°F (-46°C to 82°C) – N -50°F to 140°F (-46°C to 60°C) – P -20°F to 180°F (-29°C to 82°C) – S 0°F to 140°F (-18°C to 60°C) – T 0°F to 180°F (-18°C to 82°C)

*S or T apply for most standard duty slip casing

hangers

– U 0°F to 250°F (-18°C to 121°C)*U is common for generally available wellheads

and valves – V 35°F to 250°F (2°C to 121°C) – X 0°F to 350°F (-18°C to 180°C) - ref.

Annex G – Y 0°F to 650°F (-18°C to 345°C) - ref.

Annex G

• Combinations of classes are available:Example PU = -20°F to 250°F (-29°C to 121°C)

Temperature Class

“Choosing the tempera-

ture ratings is the ulti-mate responsibility of the

user”...API 6A 20th Edition

High Temperature ServiceEquipment can be supplied up to 350°F (180°C) witha full pressure rating. For temperatures above 350°F(180°C) a de-rating will be applied by Engineering ifnecessary.



API 6A 20th Edition

Purchasing Guide5

Partial Pressure of H2 S Determines if NACE

Applies • 0.05 psia and up requires NACE (unchanged from

previous editions)

• Above 0.5 psia – 17-4 Stainless Steels may not be used for

mandrel hangers and stems(new requirement)

• Above 1.5 psia – 410 Stainless Steels may not be used for

mandrel hangers and stems(new requirement)

Manufacturers have commonly used 17-4 SSmaterials for hangers and stems up to 3-4

psia partial pressure of H2S (depending on the

manufacturer’s design allowables). – Allowable materials for hangers and stems

above 1.5 psia – Inconels – Duplex Steels

• Have you been successfully using materials andtrims that would no longer comply with NACE?

API 6A Section 4.2.3.3 states...

“ISO 15156 (all parts) (NACE MR0175; see Clause2) includes provisions by means of testing or

documented eld history for the qualication ofmaterials for a specic sour-service application

that is outside the parameters dened in ISO

15156 (all parts) (NACE MR0175; see Clause 2). Thiscan include the use of materials in uid conditions

exceeding the limits dened in ISO 15156 (allparts) (NACE MR0175; see Clause 2), or the use of

materials not addressed in ISO 15156 (all parts)

(NACE MR0175; see Clause 2). For such sour-service applications, equipment may be described

and marked as material class ZZ.

API Material Class ZZ may be used when materialsand trims that have previously been used forsour service will not comply with current NACEMR0175/ISO 15156 standards.

“It is the responsibility of the purchaser to evaluate

and determine the applicability of the documenteddata for the intended application. For material

class ZZ, the manufacturer shall meet materialspecications supplied or approved by the

purchaser, and shall maintain traceable records to

document the materials of construction, regardless

of PSL.”1

Material Class

1 NACE MR0175/ISO 15156 specification states in Section 8.2 duration of the documented field experience shall be at leasttwo years. The end user of the equipment is responsible for documenting the performance history.

ZZ class parts marking and descriptions willbe determined between the customer andmanufacturer.

• Suixes for Material Classes DD, EE, FF and HH“will include ... the maximum allowable partialpressure of H

2S”

– 0,5 = 0.5 psia maximum partial pressure of H2S

(example: EE-0,5) – 1,5 = 1.5 psia maximum partial pressure of H

2S

(example: FF-1,5) – NL = No limit to H

2S (example: DD-NL)

– Other material class suixes may be applicable,depending on materials of construction

Trim Selection Chart

For combinations of H2S and CO

2partial pressures

Additional Factors Which Influence the Eectof H2 S

• pH

• Temperature

• Chloride concentration

• Elemental sulfur

Additional Factors Which Influence the Eectof CO

2

• pH

• Sand production

• Temperature

• H2S level • Chloride ion concentration

• Water production and composition

• Types and relative amounts of producedhydrocarbons

Some NACE MR0175/

ISO 15156 changes willaect material selection

and equipment cost .

“Choosing material class

and specific materials forspecific conditions is the

ultimate responsibility of

the user.”...API 6A 20th Edition



6

Method 2:

ExampleAssume a well has the following:

• 0.004% H2S

• 0.5% CO2

• 10,000 psi max. shut-in pressure

For H2S:

For CO2:

Resulting Trim Selection:FF-0,5

Partial Pressure Formulas

Method 1:

ExampleAssume a well has the following:

• 50 PPM H2S (0.005%)

• CO2 of 0%

• 10,000 psi max. shut-in pressure

Resulting Trim Selection:EE-0,5 or DD-0,5

H2S Partial Pressure

0 to

< 0.05 psia

0.05 to

0.5 psia

> 0.5 to

1.5 psia ¹> 1.5 psia ¹

C O

2

P a r t i a l P r e s s u r e

0 to

< 7 psia

AA EE-0,5 or DD-0,5 DD-1,5 or EE-1,5 ² DD-NL or EE-NL ³

Non-Sour Sour Sour SourNon-Corrosive Non-Corrosive Non-Corrosive Non-Corrosive

7 psia to

30 psia

BB EE-0,5 EE-1,5 ² EE-NL ³

Non-Sour Sour Sour Sour

Slightly Corrosive Slightly Corrosive Slightly Corrosive Slightly Corrosive

>30 psia to <200psia

CC FF-0,5 FF-1,5 ² FF-NL ³


Moderately toHighly Corrosive




200 psia

and up

CC or HH FF-0,5 or HH-0,5 FF-1,5 or HH-1,5 FF-NL or HH-NL


Highly Corrosive Highly Corrosive Highly Corrosive Highly Corrosive

Corrosionresistant alloysmay be needed.

GE Oil & Gas Pressure Control recommends that Corrosion Resistant Alloysbe considered beginning at CO

2partial pressures of 200 psia.

Consult with engineering for material selection. Additional factors should be considered.

¹ Material Class ZZ may be used when materials and trims previously used for sour service will not comply with current NACE MR0175/ISO 15156 standards.

² 17-4 stainless steel is not allowed for stems or tubing hangers above 0.5 psia H2S.

³ 410 stainless steel is not allowed for stems or tubing hangers above 1.5 psia H2S.

Note: Partial pressures of

H2S and CO

2 should be

determined separately.

H2S psia =

H2S PPM

x working pressure1,000,000

50x 10,000 psi = 0.5 partial pressure

1,000,000

0.004 x 10,000 psi = 0.4 psi partial pressure H

2S

100

H2

S psia =H

2S % *

x working pressure100

and

CO2 psia =

CO2% *

x flowing pressure100

0.5

100 x 10,000 psi = 50 psi partial pressure CO

2

* Note: To determine the fractional amount of H2S or CO

2 in a well divide the percentage of H

2S or CO

2 by 100.



API 6A 20th Edition

Purchasing Guide7

Product Specication Level

GE Note: For fracturing

and flowback operations,the customer may con-

sider the annulus valveon the side of the tubinghead as primary equip-

ment.

PSL = P roduct S pecification Level — What AreThey For?

• Quality control requirements that increase withthe severity of service

– The customer is asked to specify hisrequirements to the manufacturer

– PSL’s for various service conditions arerecommended by API in Annex A

• Specific quality control requirements for dierent

product categories: – Wellheads, Spools, Adapters, Valve Bodies and

Bonnets – Stems – Valve bore sealing mechanisms

Note: Valves combine parts from 3 dierentcategories

– Mandrel Hangers and Hanger Couplings

– Other

What Parts Do PSL Recommendations Cover? • Recommendations for PSL apply only to Primary

Equipment – Tubing Heads – Tubing Hangers or Hanger Couplings – Tubing Head Adapters – Lower Master Valves

• PSL 3G (new) consists of PSL 3 quality controlrequirements for manufacturing with additionalgas testing

PSL Decision Criteria • Rated Working Pressure

– Generally, the higher the working pressure, thehigher the recommended PSL

• High H2S concentration?

– Yes, if a leak would result in 70 PPM or more inair (humans can’t smell it)

Alternate Option:

– Yes, if the 100 PPM radius of exposure (ROE) isgreater that 50 feet from the wellhead (localregulations may apply to ROE calculation)

• Gas Well?Note: Close-proximity and H

2S radius of exposure

(ROE) analysis can be substituted for “gas well”.

– Close Proximity – Yes, if 100 PPM ROE of H

2S > than 50 feet

from the wellhead and includes any part ofa public area except a public road.

– Yes, if 500 PPM ROE of H2S > than 50 feet

from the wellhead and includes any part ofa public area including a public road.

– Yes, if well is located: – in any environmentally sensitive areas

such as parks, wildlife preserve, city limits,etc.

– within 150 feet of an open flame or firedequipment

– within 50 feet of a public road (lease roadexcluded)

– in or near inland navigable waters – in or near surface domestic water

supplies – within 350 feet of any dwelling

API PSL Decision Tree for Primary PartsEquipment Covered:

• Lower Master Valve

• Tubing Head Adapter

• Tubing Hanger

• Tubing Head

Primary Equipment

“All other wellhead partsare classified as second-

ary. The specification lev -

el for secondary equip-ment may be the same

as or less than the levelfor primary equipment.”

...API 6A 20th Edition

295-1810

If fracturing of thewell is planned,the customer mayconsider theAnnulus Valve as aprimary part.



8

High H S

Concentration?2

Gas Well? *

Rated

WorkingPressure?

PSL 3G

PSL 3

PSL 3G

PSL 3

Yes Yes

NoNo

>5,000 psi

(34.5 MPa)

No

High H S

Concentration?2

Gas Well? *

Yes

No

Yes

No

Yes

No

Yes

PSL 3G

PSL 3

PSL 2

PSL 2

PSL 1

PSL 3

PSL 2

Gas Well? *

No

YesRated

Working

Pressure?

Rated

Working

Pressure?

>5,000 psi (34.5 MPa)

>5,000 psi (34.5 MPa)

>5,000 psi(34.5 MPa)

Gas Well? *

Start Here

Rated Working

Pressure

15,000 psi≥

(103.5 MPa)?

NACE

MR0175/

ISO15156

(All Parts)?

Rated

Working

Pressure?

PSL 2

≤

5,000 psi (34.5 MPa)

No

Yes

≤5,000 psi (34.5 MPa)

≤5,000 psi (34.5 MPa)

≤5,000 si (34.5 MPa)

* Gas Well Note: “Users who are accustomed to the use of the close-proximity and radius-of-exposure concepts may substi-tute close proximity for gas well.” ...API 6A 20th Edition



API 6A 20th Edition

Purchasing Guide9

Requirement PSL 1 PSL 2 PSL 3/3G ¹ PSL 4 ¹

Impact Testing ofRaw Material

Temp K and L onlyTemp K, L, N and

P onlyTemp K, L, N, P, S, T, U

and V onlySame asPSL 3/3G

Test at or below bottom oftemp range

Test at or below bottomof temp range


Same asPSL 3/3G

Hardness Testing ofMachined Parts

5M & below - sample testing

Test all parts for allworking pressures

Same as PSL 2 plus testlocations on each end

connection face

Same asPSL 3/3G

10M & above - test every part

Sour service - test every part

Surface NDE ² ofMachined Parts

Not RequiredExamine all accessible

wetted and sealingsurfaces

Examine ALL accessiblesurfaces plus areas prepped

for weld overlay

Same asPSL 3/3G

Volumetric NDE ² ofRaw Material

Not Required Not RequiredExamine 100% volume as

practical After heat treating

Same as PSL 3/3Gplus restricted

acceptance criteria

¹ PSL 3, 3G and 4 require serialization of each part² Non-Destructive Examination

Product Specication Level —QC Requirements for Manufacture & Testing of PSL 1-4 Equipment

Gate Valves

Bodies, Bonnets, End/OutletConnections and Hub End

Connections

Requirement PSL 1 PSL 2 PSL 3/3G¹ PSL 4 ¹


Manufacturer’s MaterialSpecification

Temp K, L, N and P onlyTemp K, L, N, P, S, T, U

and V onlySame asPSL 3/3G

Test at or belowbottom of temp range


Same asPSL 3/3G



Test all parts for all working pressures10M & above - test every part


Surface NDE ² of

Machined Parts Not Required

Examine all accessible


Examine ALL accessible

surfaces plus areas preppedfor weld overlay

Same as

PSL 3/3G

Volumetric NDE ² ofRaw Material

Not Required Not Required After heat treatingSame asPSL 3/3G


Stems


Tensile Testing ofRaw Material

Not Required Not RequiredManufacturer’s Material

Specification

Manufacturer’sMaterial

Specification


Test all parts for sour service(DD, EE, FF, HH trims)

Test all parts for all working pressures

Surface NDE ² ofMachined Parts




for weld overlay

Same asPSL 3/3G

¹ PSL 3, 3G and 4 require serialization of each part

² Non-Destructive Examination

³ Choke trim: only surface NDE and serialization are required

Valve Bore SealingMechanisms and Choke

Trim³



10

Requirement PSL 1 PSL 2 PSL 3 PSL 3G PSL 4

Hydrostatic Body TestTwo

3-minuteholds

Two 3-minuteholds

One 3-minute holdplus one

15-minute hold

One 3-minute hold plusone 15-minute hold


Hydrostatic Seat TestTwo

3-minuteholds

Two 3-minuteholds

One 3-minute holdplus one

15-minute hold



Gas Body TestNot

RequiredNot Required Not Required

One 15-minutehold @ WP


Gas Seat TestNot


One 15-minute hold @WP plus one 15-minute

hold @ 300 psi

One 1-hour hold @ WPfully open & close valve,one 1-hour hold @ 5 to

10% WP

Gas Back-Seat TestNot


Optional – One 15-minutehold @ WP

One 1-hour hold @ WP,disengage / reengage,one 1-hour hold @ 5 to

10% WP

Valve Testing

Requirement PSL 1 PSL 2 ¹ PSL 3 ¹ PSL 3G ¹ ² PSL 4 ¹

Hydrostatic Test ³Two

3-minuteholds

Two 3-minuteholds

One 3-minute holdplus one 15-minute

hold



Gas Test ³Not

requiredNot required Not required One 15-minute hold@ WP


¹ PSL 2 and above: Serialization of assemblies is required

² PSL 3G assemblies are built with PSL 3 components³ Separate tests are required above and below crossover seal

Testing of Casing andTubing Heads, Tubing HeadAdapters, Chokes, Teesand Crosses, CrossoverConnectors, Adapter andSpacer Spools

Requirement PSL 1 PSL 2 PSL 3 ¹ PSL 4 ¹ ²

Impact Testing of Raw Material

Not Required Test every part Same as PSL 2 Same as PSL 2

Hardness Testing after all heattreatment and machining

Test every part Same as PSL 1Same as PSL 2 plus

additional test locationsSame as PSL 2 plus

additional test locations

Surface NDE ³ of Machined Parts Not Required

Examine allaccessible wetted

and sealingsurfaces

Examine ALL accessiblesurfaces plus areas

prepped for weld overlaySame as PSL 3

Volumetric NDE³ of Raw Material Not Required Not RequiredExamine 100% volumeas practical After heat

treating

Same as PSL 3 plusrestricted

acceptance criteria

¹ PSL 3 and 4 require serialization of each part

² PSL 4 permits NO welding except weld overlays

³ Non-Destructive Examination

Mandrel Hangers

Casing and Tubing HangerMandrels/Bodies



Temp K and L onlyTemp K, L, N and P

onlyTemp K, L, N, P, S, T, U

and V onlySame as PSL 3/3G


Test at or belowbottom of temp range


Same as PSL 3/3G

Hardness Testingof Raw and

Machined Parts


Test all parts for allworking pressures

Same as PSL 2 plus testlocations on each end

connection faceSame as PSL 3/3G10M & above - test every part


Surface NDE ²of Machined Parts




for weld overlaySame as PSL 3/3G

Volumetric NDE ²

of Raw Material

Not Required Not RequiredExamine 100% volume as

practical After heat treating

Same as PSL 3/3G plusrestricted acceptance

criteria


Tubing Heads and

Tubing Head Adapters

Bodies, End/OutletConnections and Hub EndConnections



API 6A 20th Edition

Purchasing Guide11

Performance RequirementsPR1, PR2, and Annex F

Cycle Testing of Designs • Dierent cycle tests for valves, casing hangers or

other types of products

• PR1 API minimum required cycle testing – Minimum testing to qualify any design to be

API Monogrammed

• PR2 additional test cycles – Manufacturer’s option or customer

requirement

• Annex F Severe standardized testing includesmechanical, pressure and temperature cycling

– Manufacturer’s option or customerrequirement

– Annex F has PR1 or PR2 (additional cycles)options

API Purchasing Guide Cabezales

Documents

Transcript of API Purchasing Guide Cabezales