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Wood Group Pressure Control
08-0394-0
Mandatory February 1, 2005
Selection of Wellhead &
Christmas Tree Products
in compliance with
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
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?
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
Moderately to Highly
Corrosive
Moderately to Highly
Corrosive
Moderately to Highly
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 H2S.
³ 410 stainless steel is not allowed for stems or tubing hanger above 1.5 psia H2S.
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
CO
2 P
art
ial
Pre
ss
ure
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”
08-0394-4
Temperature Classes
API 6A 19th Edition
All products are built for a specific API temperature class
Consider 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”
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 and FF sour service up to 3 or more psia H2S
• API 6A 19th Edition – 17-4 SS is not allowed 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 tensile strength 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
08-0394-6
316 Stainless Steel
• Industry has historically used 316 SS for fittings, needle valves and pressure gauges for 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 and temperatures 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
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)
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
08-0394-9
API 6A 19th Edition
• Determine the required material class for sour service (EE or FF)
– Find the exact H2S partial pressure
• 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”
08-0394-10
PSL (Product Specification Level)
• Quality Control & testing recommendations increase with severity of service
– Working Pressure
– H2S Concentration
• More quality control = more measurements during manufacture & more extensive 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 decision tree criteria
– Alternate questions can be used
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 to the manufacturer
– Are customers unaware of the details of API recommendations?
• PSL recommendations apply to the 4 “Primary Parts” of a wellhead assembly
– 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.
08-0394-12
PSL (Product Specification Level) Decision Tree
Alternate questions
• High H2S Concentration? – Yes, if a leak will result in 70 PPM or more in air
• If your well has less than 70 PPM H2S, the answer is NO
• Alternate: – Is the 100 PPM radius of exposure greater than 50 ft. from the wellhead?
• Depending on flow rate, it is possible for wells with 70 PPM H2S or more to have a 100 PPM ROE less than 50 ft. from the wellhead
– Radius of Exposure formulas are shown in API 6A, Annex A, A.4.5
08-0394-13
• Gas Well?
• Alternate: customer may use Close Proximity and Radius of Exposure Analysis
– Yes, if 100 PPM ROE > 50 ft. and includes any part of a public area except a public road
– Yes, if 500 PPM ROE > 50 ft. and includes any part of a public area including a public road
– Yes, if well is located:
– In any environmentally sensitive area such as parks, wildlife preserve, city limits, etc.
– Within 150 ft. of an open flame or fired equipment
– Within 50 ft. of a public road (lease road excluded)
– In or near inland navigable waters
– In or near domestic water supplies
– Within 350 ft. of any dwelling
PSL (Product Specification Level) Decision Tree
Alternate questions
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)
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 only Temp K, L, N and P
only
Temp K, L, N, P, R, S,
T, U and V only Same 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 range Same as PSL 3/3G
Hardness Testing of
Raw and Machined Parts
5M & below - sample
testing
Test all parts for all
working pressures
Same as PSL 2 plus
test locations on each
end connection face
Same as PSL 3/3G 10M & above - test
every part
Sour service - test
every part
Surface NDE ² of
Machined Parts Not 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
Material Not Required Not Required
Examine 100% volume
as 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
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 only Temp K, L, N, P, R, S, T, U
and V only Same as PSL 3/3G
Test at or below bottom of
temp range
Test at or below bottom of
temp range Same as PSL 3/3G
Hardness Testing of
Machined Parts
5M & below - sample
testing
Test all parts for all working pressures 10M & above - test
every part
Sour service - test
every part
Surface NDE² of
Machined Parts Not Required
Examine all accessible
wetted and sealing
surfaces
Examine ALL accessible
surfaces plus areas
prepped for weld overlay
Same as PSL 3/3G
Volumetric NDE² of Raw
Material Not Required Not Required
After heat treating and
Before machining Same as PSL 3/3G
¹ PSL 3, 3G and 4 require serialization of each part
² Non-Destructive Examination
Quality Control at different PSL’s
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 Material Not 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
Machined Parts Not Required
Examine all accessible
wetted and sealing
surfaces
Examine ALL accessible
surfaces plus areas
prepped for weld overlay
Same as PSL 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
Quality Control at different PSL’s
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 required One 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
Test Not required Not required Not required
Optional — One
15-minute hold @
WP
One 1-hour hold @
WP, disengage /
reengage, one 1-hour
hold @ 5 to10% WP
Quality Control at different PSL’s
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 Material Temp 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 1 Same as PSL 2 plus
additional test locations
Same as PSL 2 plus
additional test locations
Surface NDE ³ of
Machined Parts Not Required
Examine all accessible
wetted and sealing
surfaces
Examine ALL accessible
surfaces plus areas
prepped for weld
overlay
Same as PSL 3
Volumetric NDE³ of
Raw Material Not Required Not Required
Examine 100% volume
as practical, both After
heat treating and Before
machining
Same as PSL 3 plus
restricted acceptance
criteria
³ Non-Destructive Examination
Quality Control at different PSL’s
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 ³ 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 Test ³ Not required Not required Not required One 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.
Quality Control at different PSL’s