0394 api 6a 19th edition

8/10/2019 0394 API 6A 19th Edition

http://slidepdf.com/reader/full/0394-api-6a-19th-edition 1/21

Wood GroupPressure Control

08-0394-0

Mandatory February 1, 2005

Selection of Wellhead &

Christmas Tree Products

in compliance with

API 6A 19th Edition

8/10/2019 0394 API 6A 19th Edition


08-0394-1

API specs are for CUSTOMERS to use

• API specifications are for the user: – For selecting materials suited to well conditions

– For ordering equipment

• API specifications impact the manufacturing process: (Criteria)

– Temperature Class

– Material Class (trim)

– PSL (Product Specification Levels)

• Recommended by API to the user for various service conditions

– PR (Performance Requirements)

• Levels of testing done to qualify product designs for monogram

• API requires every monogrammed product to meet API specs for all 4

Criteria

8/10/2019 0394 API 6A 19th Edition


08-0394-2

– With or without the API monogram – builds all new products to meet API requirements for

• Temperature Class

• Material Class

• PSL

• PR

• Companies can be “API Licensed” for marketing reasons, but then

rarely comply with API requirements

– Licensed for 2 or 3 product types?

– Don’t actually monogram parts? – Buy-out equipment of someone else’s design?

8/10/2019 0394 API 6A 19th Edition


08-0394-3

API Material Classes (Trims)

w/ limits for 17-4 SS (0.5 psia) and 410 SS (1.5 psia) stems & hanger mandrels

0 to < 0.05 psia 0.05 to 0.5 psia > 0.5 and < 1.5 psia ¹ > 1.5 psia ¹

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

Non-Corrosive Non-Corrosive Non-Corrosive Non-Corrosive

BB EE-0,5 EE-1,5 ² EE-NL ³Non-Sour Sour Sour Sour

Slightly Corrosive Slightly Corrosive Slightly Corrosive Slightly Corrosive

CC FF-0,5 FF-1,5 ² FF-NL ³Non-Sour Sour Sour Sour

Moderately to Highly

Corrosive


Corrosive


Corrosive


Corrosive

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

Non-Sour Sour Sour Sour

Highly Corrosive Highly Corrosive Highly Corrosive Highly Corrosive

² 17-4 stainless steel is not allowed for stems or tubing hangers above 0.5 psia H2 S.³ 410 stainless steel is not allowed for stems or tubing hanger above 1.5 psia H2 S.

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

Wood Group Pressure Control recommends that Corrosion Resistant Alloys be considered beginning

at CO2 partial pressures of 200 psia.

Corrosion

resistant

alloys may

be needed.

¹ Material Class ZZ may be used when materials and trims previously used for sour service will not comply with current NACE

MR0175/ISO15156 standards

C O 2

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

r e

H2S Partial Pressure

0 to

< 7 psia

7 psia to

30 psia

> 30 psia to

< 200 psia

200 psia

and up

standard sour service ratings are “0,5” or “NL”

8/10/2019 0394 API 6A 19th Edition


08-0394-4

Temperature Classes

API 6A 19th Edition

All products are built for a specific API temperature classConsider max flowing and min ambient temperature (mud temp?)

• K -75 to 180 F

• L -50 to 180

• N -50 to 140

• P -20 to 180

• R Room Temperature

• S 0 to 140

• T 0 to 180

• U 0 to 250

• V 35 to 250

• X 0 to 350 (ref Annex G)• Y 0 to 650 (ref Annex G)

“Choosing temperature ratings is the ultimate responsibility of the user”

8/10/2019 0394 API 6A 19th Edition


08-0394-5

NACE: limits for materials in H2S service

• 17-4 Stainless Steel Industry has historically used 17-4 SS for valve stems and tubing hangers for EE andFF sour service up to 3 or more psia H2S

• API 6A 19th Edition – 17-4 SS is n ot allow ed in sour service for hanger mandrels and stems above

0.5 psia H2S partial pressure – Inconel has NO LIMIT for H2S partial Pressure

• In many applications, 410 SS cannot be used as a substitute due to tensilestrength requirements (re: hanger mandrels, stems)

• WGPC 19th Edition products for sour service: – Hanger Mandrels and Products with stems

• 17-4 SS up to .5 psia max H2S partial pressure • Inconel for No Limit to H2S partial pressure

8/10/2019 0394 API 6A 19th Edition

http://slidepdf.com/reader/full/0394-api-6a-19th-edition 7/2108-0394-6

316 Stainless Steel

• Industry has historically used 316 SS for fittings, needle valves and pressure gaugesfor EE and FF Sour service with no limit to H2S partial pressure

• API 6A 19th Edition

– 316 SS is not allowed in sour service when chlorides are present andtemperatures are above 140 F

– Effects grease & test fittings in all products in standard temperature ranges

– Next NACE expected to change to max 200 F?

• WGPC 19th edition products for sour service:

– Low alloy fittings will be used in all alloy bodies

– Nickel plated alloy or Inconel fittings are used in Stainless Steel bodies

NACE: limits for materials in H2S service

8/10/2019 0394 API 6A 19th Edition


08-0394-7

NACE effects API Material Classes

• 19th Edition sour service Material Classes (Trims) must be labeled with the

maximum allowable H2S partial pressure, depending on the materials of

construction (may vary by manufacturer)

API 6A 17th

Edition & earlier API 6-A 19th

Edition

DD DD-0,5 (17-4 SS stem is allowed)

or DD-NL (w/ low alloy NACE stem

* inconel stem is allowed)

EE EE-0,5 (w/ 17-4 SS stem)

or EE-NL (w/ inconel stem)

FF FF-0,5 (w/ 17-4 SS stem)

or FF-NL (w/ inconel stem)

WGPC 19th Edition Sour Service Material Classes (Trims)

8/10/2019 0394 API 6A 19th Edition


08-0394-8

19th Edition Changes

NACE changes affect API materials

• 0,5 suffix will appear on our products with internal parts

– Valves

– Tubing Hanger Mandrels*

• API considers the tubing hanger mandrel an “internal part” of a

wellhead assembly (as a stems are considered “internal parts” of valves)

• NL suffix will appear on our products with no internal parts

– Heads, Spools & Flanges

– Tubing Heads (lockscrews are not addressed by API 6A)

– Tubing Head Adapters, DSA’s (with or without packoffs)

– Tees, Crosses, Tree Caps

8/10/2019 0394 API 6A 19th Edition


08-0394-9

API 6A 19th Edition

• Determine the required material class for sour service (EE or FF) – Find th e exact H2S partial pressu re

• Your well(s) may be able to use 17-4 SS stems & tubing hangers

• It takes a lot of H2S to go over .5 psia

– @ 5,000# 100 PPM H2S = .5 psia – @ 10,000# 50 PPM H2S = .5 psia

– @ 15,000# 33.3 PPM H2S = .5 psia

• If WGPC quotations dept. doesn’t know the H2S partial pressure

– WGPC will quote Valves & Hanger Mandrels (as applicable) rated by API for .5

psia maximum H2S partial pressure. A statement will appear on the quotation.

“Choosing material class and specific materials for specific conditions is

the ultimate responsibility of the user”

8/10/2019 0394 API 6A 19th Edition


08-0394-10

PSL (Product Specification Level)

• Quali ty Contro l & test ing recommendat ions inc rease with severi ty ofservice

– Working Pressure

– H2S Concentration

• More quality control = more measurements during manufacture & moreextensive pressure testing

• PSL 3G (new in 19th edition)

– Replaces PSL 4 in API decision tree

• PSL 3 QC for manufacturing + gas testing

– PSL 4 is still available (if customer elects)

• PSL decisio n tree cr i ter ia – Alternate questions can be used

8/10/2019 0394 API 6A 19th Edition


08-0394-11

PSL (Product Specification Level)

API “recommendations to users”

• Many customers don’t follow these recommendations – Do customers assume this is taken care of because their supplier follows API

requirements?

• PSL’s are recommended by API to the user to specify his requirements tothe manufacturer

– Are customers unaware of the details of API recommendations?

• PSL recommendations apply to the 4 “Primary Parts” of a wellheadassembly

– Tubing Head

– Tubing Hanger

– Tubing Head Adapter

– Lower Master Valve

» In some frac operations, the customer may consider the annulus

valve on the side of the tubing head as a primary part as well.

8/10/2019 0394 API 6A 19th Edition


8/10/2019 0394 API 6A 19th Edition


08-0394-14

• Performance Requirement – Testing of product designs is required by API before a product is eligible to be

monogrammed by the manufacturer

• PR 1 (minimum required)

• At room Temperature

• Pressure and mechanical cycles

– PR 2 (option of customer or manufacturer)

• At room temperature

• Additional pressure and mechanical cycles

– Annex F adds temperature cycles (option of customer or manufacturer)• F PR 1 adds temperature max & min

• F PR 2 most severe testing includes added # of cycles

PR (Performance Requirement)

8/10/2019 0394 API 6A 19th Edition


08-0394-15

Quality Control at different PSL’s

Bodies, End/Outlet Connections And Hub End Connections

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

Impact Testing of Raw

Material

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

only

Temp K, L, N, P, R, S,

T, U and V onlySame as PSL 3/3G

Test at or below

bottom of temp range

Test at or below

bottom of temp range

Test at or below

bottom of temp rangeSame as PSL 3/3G

Hardness Testing ofRaw and Machined Parts

5M & below - sample

testing

Test all parts for allworking pressures

Same as PSL 2 plustest locations on each

end connection face

Same as PSL 3/3G10M & above - testevery part

Sour service - test

every part

Surface NDE ² of

Machined PartsNot Required

Examine all accessible

wetted and sealing

surfaces

Examine ALL

accessible surfaces

plus areas prepped for

weld overlay

Same as PSL 3/3G

Volumetric NDE ² of Raw

MaterialNot Required Not Required

Examine 100% volumeas practical, both After

heat treating and

Before machining

Same as PSL 3/3G plus

restricted acceptance

criteria

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

² Non-Destructive Examination

8/10/2019 0394 API 6A 19th Edition


08-0394-16

Stems

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

Impact Testing of Raw

Material

Manufacturer's

Material Specification

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

and V onlySame as PSL 3/3G

Test at or below bottom of

temp range

Test at or below bottom of

temp rangeSame as PSL 3/3G

Hardness Testing ofMachined Parts

5M & below - sample

testing

Test all parts for all working pressures10M & above - testevery part

Sour service - test

every part

Surface NDE² of



wetted and sealing

surfaces

Examine ALL accessible

surfaces plus areas

prepped for weld overlay

Same as PSL 3/3G

Volumetric NDE² of RawMaterial

Not Required Not RequiredAfter heat treating and

Before machiningSame as PSL 3/3G




8/10/2019 0394 API 6A 19th Edition


08-0394-17

Valve Bore Sealing Mechanisms And Choke Trim³

Requirement PSL 1 PSL 2 PSL 3/3G ¹ PSL 4¹

Tensile Testing of

Raw MaterialNot required Not required

Manufacturer's Material

Specification

Manufacturer's Material

Specification

Hardness Testing

of Machined Parts

Test all parts for sour

service (DD, EE, FF, HH

trims)

Test all parts for all working pressures

Surface NDE² of



wetted and sealing

surfaces


surfaces plus areas

prepped for weld overlay

Same as PSL 3/3G



³ Choke trim: only surface NDE and serialization are required


8/10/2019 0394 API 6A 19th Edition


08-0394-18

Valve Testing

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

Hydrostatic Body

Test

Two 3-minute

holds

Two 3-minute

holds

One 3-minute hold

plus one 15-

minute hold

One 3-minute hold

plus one 15-

minute hold

One 3-minute hold

plus one 15-minute

hold

Hydrostatic Seat

Test

Two 3-minute

holds

Two 3-minute

holds

One 3-minute hold

plus one 15-

minute hold

One 3-minute hold

plus one 15-

minute hold

One 3-minute hold

plus one 15-minute

hold

Gas Body Test Not required Not required Not requiredOne 15-minute

hold @ WP

One 15-minute hold

@ WP

Gas Seat Test Not required Not required Not required

One 15-minute

hold @ WP plus

one 15-minute

hold @ 300 psi

One 1-hour hold @

WP fully open &

close valve, one 1-

hour hold at 5 to 10%

WP

Gas Back-Seat

TestNot required Not required Not required

Optional — One15-minute hold @

WP

One 1-hour hold @WP, disengage /

reengage, one 1-hour

hold @ 5 to10% WP


8/10/2019 0394 API 6A 19th Edition


08-0394-19

Casing and Tubing Hanger Mandrels/Bodies

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

Impact Testing of

Raw MaterialTemp K & L only Test every part Same as PSL 2 Same as PSL 2

Hardness Testing

after all heat

treatment and

machining

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

additional test locations

Same as PSL 2 plus

additional test locations

Surface NDE ³ of



wetted and sealing

surfaces


surfaces plus areas

prepped for weld

overlay

Same as PSL 3

Volumetric NDE³ of

Raw MaterialNot Required Not Required

Examine 100% volume

as practical, both Af ter

heat treating and Before

machining

Same as PSL 3 plus

restricted acceptance

criteria

³ Non-Destructive Examination


8/10/2019 0394 API 6A 19th Edition


08-0394-20

Testing Of Casing & Tubing Heads, Tubing Head Adapters, Chokes, Crossover Connectors, Adapter And Spacer Spools

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

Hydrostatic Test ³Two 3-minute

holds

Two 3-minute

holds

One 3-minute hold

plus one 15-

minute hold

One 3-minute hold

plus one 15-

minute hold

One 3-minute hold

plus one 15-minute

hold

Gas Test ³ Not required Not required Not requiredOne 15-minute

hold @ WP

One 15-minute hold

@ WP

¹ PSL 2 and above: Serialization of assemblies is required.

² PSL3G assemblies are built with PSL3 components.

³ Separate tests are required above & below crossover seal.


0394 api 6a 19th edition

Documents