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8/19/2019 API Purchasing Guide Cabezales
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API 6A 20th EditionPurchasing Guide forPressure Control Wellhead and Christmas Tree EquipmentIncluding changes in NACE MR0175/ISO 15156 latest edition
GE Oil & GasDrilling & Production
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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
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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.
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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
• Tensile and hardness testing
• Impact testing • Job lot traceability
• Hydrostatic testing required
Running, Retrieving and Testing Tools • Material qualification
• Tensile and hardness testing
• 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.
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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.
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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.
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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
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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
Non-Sour Sour Sour Sour
Moderately toHighly Corrosive
Moderately toHighly Corrosive
Moderately toHighly Corrosive
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
Non-Sour Sour Sour Sour
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.
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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.
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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
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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
Test at or below bottom oftemp 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
Impact Testing ofRaw Material
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
Test at or below bottom oftemp range
Same asPSL 3/3G
Hardness Testing ofMachined Parts
5M & below - sample testing
Test all parts for all working pressures10M & above - test every part
Sour service - test every part
Surface NDE ² of
Machined Parts Not Required
Examine all accessible
wetted and sealingsurfaces
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
¹ PSL 3, 3G and 4 require serialization of each part² Non-Destructive Examination
Stems
Requirement PSL 1 PSL 2 PSL 3/3G ¹ PSL 4 ¹
Tensile Testing ofRaw Material
Not Required Not RequiredManufacturer’s Material
Specification
Manufacturer’sMaterial
Specification
Hardness Testing ofMachined Parts
Test all parts for sour service(DD, EE, FF, HH trims)
Test all parts for all working pressures
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
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
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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
One 3-minute hold plusone 15-minute hold
Hydrostatic Seat TestTwo
3-minuteholds
Two 3-minuteholds
One 3-minute holdplus one
15-minute hold
One 3-minute hold plusone 15-minute hold
One 3-minute hold plusone 15-minute hold
Gas Body TestNot
RequiredNot Required Not Required
One 15-minutehold @ WP
One 15-minutehold @ WP
Gas Seat TestNot
RequiredNot Required Not Required
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
RequiredNot Required Not Required
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
One 3-minute hold plusone 15-minute hold
One 3-minute hold plusone 15-minute hold
Gas Test ³Not
requiredNot required Not required One 15-minute hold@ WP
One 15-minutehold @ 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
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 as PSL 3/3G
Test at or below bottom oftemp range
Test at or belowbottom of temp range
Test at or below bottom oftemp range
Same as PSL 3/3G
Hardness Testingof Raw and
Machined Parts
5M & below - sample testing
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
Sour service - test every part
Surface NDE ²of Machined Parts
Not RequiredExamine all accessible
wetted and sealingsurfaces
Examine ALL accessiblesurfaces plus areas prepped
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
¹ PSL 3, 3G and 4 require serialization of each part² Non-Destructive Examination
Tubing Heads and
Tubing Head Adapters
Bodies, End/OutletConnections and Hub EndConnections
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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
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Worldwide HeadquartersP.O. Box 82
Houston, Texas 77001-0082Tel +1 832-325-4200
Fax +1 832-325-4350
GE © 2012. All rights reserved.02/12 PC #01 0379 6
geoilandgas.com/pressurecontrol