17D Changes and How It Works With 6A

New Items for ISO 13628-4 – API 17D and how it works with

ISO 10423 - API 6A

ISO 10423 / API 6A Wellhead & Christmas Tree Equipment

ISO 13533 / API 16A DrillThrough Equipment

ISO 15156 / NACE MR-01-75 H2S Materials

ISO 13628 / API 17 Subsea Equipment

Source: http://info.ogp.org.uk/standards

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ISO Standard 13628 Covers Many Subsea Topics

ISO 13628-4 / API 17D IS JUST ONE PART

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API 6A and 17D

The authors’ intent for 17D is to follow 6A for the majority of manufacturing and testing, but to highlight the necessary design differences associated with operating wellhead equipment in a submerged ocean environment.

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What’s Intended to be the Same •

Nominal bore sizes and drift requirements

•

Definitions for design life, PR and PSL, material class, and temp. class

•

Requirements for SSV and USV

•

Material classes – including updates from NACE MR-01-75 – H2S material usage

•

Raw material manufacturing practices (recently upgraded by issue of RP 6HT)

•

Qualification Testing (Annex F)

•

Welding practices

•

FAT pressure test requirements

•

Intent to have two pressure containing (and testable) barriers between wellbore fluids and the environment

•

17D flanges can be made up to same size and pressure rated 6BX flanges

•

Intent is that if it’s not specifically mentioned in 17D, then design should default to 6A (or 16A) standards, or ASME pressure vessel codes - along with sound engineering judgment

•

Bore spacing for dual bore block valve designs (17D adds more bore spacing criteria)

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What’s Obviously Different • 17D deals with both guideline and guidelineless orientation • 17D deals with VXT, HXT (XT are not monogrammed because of patent issues with HXT, but components within can) • 17D deals with actuator design for water depth and performance criteria • 17D deals with galvanic corrosion material selection and coating issues for both inside (exposed to wellbore fluids) and outside (immersed in sea water) • 17D features swivel flanges (17SS) based on 16A hubs, and 6B raised face flanges – added 13-5/8 size • 17D allows for a myriad of OEC designs, provided they’ve been qualified • 17D offers SBX ring gaskets made from a CRA and special weep hole – added SBX 149 based on FMC gasket design • 17D ring gasket grooves feature a CRA overlay for non-CRA base material flange bodies

• 17D added nominal 1” flanges for 15k and 17.5ksi pressure ratings • 17D only offers PSL 2, 3 and 3G • 17D deals with mudline and subsea wellheads and their tree interfaces • 17D deals with running tool design and testing • 17D identifies the external loading conditions that equipment must withstand associated with installation and intervention in addition to pressure loads • 17D has Table 3 which recommends more component tests. External hyperbaric testing to Table L.1 using 6A Annex F guidelines/procedures. All 17D tests are PR2 • 17D requires calculations and verification/qualification testing in most cases when developing new equipment that has little or no field history

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What’s Not Obviously Different • 17D has only 5, 10, and 15k psi pressure ratings (6A has 2, 3, & 20k ratings) • 17D allows for higher pressure ratings up to 2.5k for “penetration” interfaces which are within 5k, 10k or 15k enclosures to deal with chemical injection connections, electrical and hydraulic connections, etc. • 17D has two temperature rating, “V” 35250 F, & “X” 0-350 F (17D uses 6A temp classes for raw material requirements) • 17D has only PSL 2, 3 and 3G (6A also has PSL 1 and 4) • 17D deals with combined stresses on mudline wellhead and submudline subsea casing hangers • 17D deals with structural lifting devices and padeye design • Material class marking in addition to letter class (for high H2S situations) found in 6A are not used in 17D

• 17D deals with piping/plumbing requirements • 17D wellheads has only one annular vent/test port for production casing to production tubing (A annulus, see API 17TR3) • 17D offers additional dual valve block bore spacing dimensions up to 5x2 bores (in addition to 6A bore spacing) • 17D has different flange requirements • • •

•

•

17D does not recognize segmented flanges, R or RX gaskets – only raised face “6B” style is accepted 17D has swivel flanges (17SS) 17D only recognizes “6B” flange geometry and BX gaskets for all pressure service, including 5k psi; ring grooves feature a CRA inlay 17D recommends corrosion resistant materials for BX gaskets 17D recommended make-up bolting stress is 2/3 of yield and requires face-to-face make-up (6A is ½ Sy and allows standoff)

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BX and SBX Gaskets

Geometrically they are the same, but function differently

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API/ISO Design Classifications

API 6A – ISO 10423

• Product Specification Level –

PSL1, PSL 2, PSL3, PSL3G, PSL4

• Material Class –

AA-HH; based on CO2 level and H2S partial pressure

• Temperature Class –

K, L, N, P, R, S, U, V, X, Y

• Performance Requirements –

PR1, PR2

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Effects of Partial Pressure on Material Choices •

•

•

Material Class based on partial pressure of corrosive mediums –

(API partial pressure limit) x 1000000 / well bore pressure = parts per million limit

–

(API partial pressure limit) x 100 / well bore pressure = mol % limit

–

For H2S API defines sour service as >.05 psi pp

–

For CO2 API defines normal service as 30 psi pp

Standard offering for most Gulf of Mexico service is FF –

.05 < H2S < 3 psi pp

–

7 < CO2 < 30 psi pp

–

> 20,000 ppm Cl2

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Upper limit on H2S to 3 psi pp based on 410 and F6NM base materials

Based in principle on NACE MR-01-75 – ISO 15156. However definition of CRA IS DIFFERENT!! corrosion-resistant alloys (CRA) non-ferrous alloys where any one or the sum of the specified amount of the following alloy elements exceeds 50%: titanium, nickel, cobalt, chromium, and molybdenum NOTE: This term refers to corrosion resistant alloys and not cracking resistant alloys as mentioned in ISO 15156 corrosion-resistant materials (CRM) ferrous or non-ferrous alloys which are more corrosion resistant than low alloy steels. This term includes: CRA’s, duplex, and stainless steels. NOTE: This term is synonymous with CRA as mentioned in ISO 15156

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Distances of conduit bores for dual parallel bore valve blocks A

Valve Size mm (in.)

B

Valve Bore Centre to Valve Bore Centre mm (in.) “A”

Large Valve Bore Centre to Block Body Centre mm (in.) “B”

34,5 MPa (5 000 psi) 52 x 52

(2-1/16 x 2-1/16)

90,09 (3,547)

45,06 (1,774)

65 x 52

(2-9/16 x 2-1/16)

90,09 (3,547)

41,91(1.650)

(3-1/8 x 2-1/16)

116,28 (4,578)

51,00 (2,008)

103 x 52 (4-1/16 x 2-1/16)

115,90 (4,563)

44,45 (1,750)

130 x 52 (5-1/8 x 2-1/16)

114,30 (4,500)

0,0

79 x 52

69,0 MPa (10 000 psi) 52 x 52

(2-1/16 x 2-1/16)

90,17 (3,550)

45,05 (1,774)

65 x 52

(2-9/16 x 2-1/16)

101,60 (4,000)

47,63 (1,875)

78 x 52

(3-1/16 x 2-1/16)

128,27 (5,050)

64,10 (2,524)

103 x 52 (4-1/16 x 2-1/16)

127,00 (5,000)

41,28 (1,625)

130 x 52 (5-1/8 x 2-1/16)

146,05 (5,750)

0,0

103,5 MPa (15 000 psi) 52 x 52 (2-1/16 x 2-1/16)

90,17 (3,550)

45,05 (1,774)

(2-9/16 x 2-1/16)

101,60 (4,000)

47,63 (1,875)

78 x 52 (3-1/16 x 2-1/16)

128,27 (5,050)

64,10 (2,524)

103 x 52 (4-1/16 x 2-1/16)

139,70 (5,500)

28,58 (1,125)

130 x 52 (5-1/8 x 2-1/16)

171,45 (6,750)

0,0

65 x 52

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Specification Break •

•

The location of the specification break between the requirements of 13628-4 (on the tree or CGB) and that of the flowline / pipeline is specifically defined below. Tree and tubing head / CGB specification breaks: –

•

Design code: All inboard piping (upstream of the wing valve) shall be designed according to 13628-4. Outboard piping shall have a RWP equal to the RWP of the tree. Piping design shall be in accordance with the specified piping code using the subsea tree’s RWP as the piping code’s design pressure. Piping codes include: API RP 1111, ANSI/ASME B31.4, ANSI/ASME B31.8 or ANSI/ASME B31.3. End connections/fittings for both inboard and outboard piping shall be designed per 13628-4, regardless of piping code used.

–

Testing: All testing for inboard piping shall conform to the requirements per 13628-4. Outboard piping shall be in accordance with the specified piping code.

–

Materials: Materials for inboard piping shall conform to 13628-4. Material for outboard piping and pipe fittings shall conform to the requirements of the specified piping code. For example, wall thickness calculated using ANSI/ASME B31.3 requires the use of ANSI/ASME B31.3 allowable material stresses.

Welding of inboard piping shall be in accordance with 13628-4. Welding of outboard piping shall conform to the specified piping code or 13628-4, whichever is appropriate.

13628-4

13628-4 XOV PSV

Pipeline Code

ASV

PWV

Pipeline Code

AWV

AMV ANNULUS / SERVICE OUTLET

13628-4

PRODUCTION OUTLET

13628-4

PMV

DHSV

VX TEST

inboard tree piping subsea tree piping which is upstream of the last tree valve (including choke assemblies) CONVENTIONAL SUBSEA TREE 2050-S02A.dwg outboard tree piping subsea tree piping which is downstream of the last tree valve (including choke assemblies) and upstream of flowline connection (refer to flow loop)

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Spec Break – System Components TOPSIDES 13628-6 PIPELINE CODE TREE CODE 13628-4

SUBSEA TREE 13628-4

CHOKE BRIDGE OR FLOWLINE CONNECTION

SCM 13628-6 UMBILICAL 13628-5 WELLHEAD SUBSEA DISTRIBUTION 13628-6

PLET, MANIFOLD, OR TEMPLATE

DOWNHOLE COMPLETION

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Spec Break – Pressure Test Pictorial Representation – Vertical Subsea Tree

Vertical Subsea Tree

Position

Description

RWP

A

Subsea Wellhead

1,0 x RWP

1,5 x RWP

NA

B

Tubing Head Connector, Tubing Head and Tree Connector

1,0 x RWP

1,5 x RWP

NA

C

Valves, Valve Block

1,0 x RWP

1,5 x RWP

NA

SCSSV flow passages and seal sub (pressurecontaining)

1,0 x RWP up to RWP + 17,2 MPa (2 500 psi) max

1,5 x RWP up to 1,5 x (RWP + 17,2 MPa (2 500 psi))

NA

SCSSV flow passages and seal sub (pressurecontrolling)

1,0 x RWP up to RWP + 17,2 MPa (2 500 psi) max

1,0 x RWP up to 1,0 x (RWP + 17,2 MPa (2 500 psi))

NA

E

Tree Cap (passages and lock mechanism)

1,0 x RWP

1,5 x RWP

NA

F

Tubing Hanger

1,0 x RWP

1,5 x RWP

NA

L1

Below installed Tubing Hanger

NA

NA

1,1 x RWP

Above tubing plug

NA

NA

1,0 x RWP

Below tubing plug

NA

NA

1,1 x RWP

Gallery

1,0 x RWP up to RWP + 17,2 MPa (2 500 psi) max

NA

NA

D

RWP = rated working pressure PMR = per manufacturer requirements

Lockdown Retention Test Pressure

Hydrostatic Body Test Pressure

L2 (not shown)

L3

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Spec Break – Pressure Test Pictorial Representation – Horizontal Subsea Tree with Separate Internal Tree Cap

Horizontal Subsea Tree with Separate Internal Tree Cap Position

Description

RWP

Hydrostatic Body Test Pressure

Lockdown Retention Test Pressure

A

Subsea Wellhead

1,0 x RWP

1,5 x RWP

NA

B

Tree Connector

1,0 x RWP

1,5 x RWP

NA

C

Valves, Valve Block

1,0 x RWP

1,5 x RWP

NA

SCSSV flow passages and seal sub (pressurecontaining)

1,0 x RWP up to RWP + 17,2 MPa (2 500 psi) max

1,5 x RWP up to 1,5 x (RWP + 17,2 MPa (2 500 psi))

NA

SCSSV flow passages and seal sub (pressurecontrolling)

1,0 x RWP up to RWP + 17,2 MPa (2 500 psi) max

1,0 x RWP up to 1,0 x (RWP + 17,2 MPa (2 500 psi))

NA

E

Debris Cap

PMR

PMR

NA

F

Crown Plugs

1,0 x RWP

1,5 x RWP

NA

G

Internal Tree Cap

1,0 x RWP

1,5 x RWP

NA

H

Tubing Hanger

1,0 x RWP

1,5 x RWP

NA

L1

Below installed Tubing Hanger

NA

NA

1,5 x RWP

L2

Below Internal Tree Cap

NA

NA

1,5 x RWP

Above Lower Crown Plug

NA

NA

1,0 x RWP

Below Lower Crown Plug

NA

NA

1,5 x RWP

Above Upper Crown Plug

NA

NA

1,0 x RWP

Below Upper Crown Plug

NA

NA

1,5 x RWP

Gallery

1,0 RWP up to RWP + 17,2 MPa (2 500 psi) max

NA

NA

D

L3

L4

L5

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Horizontal Subsea Tree without Separate Internal Tree Cap

Spec Break – Pressure Test Pictorial Representation – Horizontal Subsea Tree without Separate Internal Tree Cap

Position

Description

RWP

Hydrostatic Body Test Pressure

Lockdown Retention Test Pressure

A

Subsea Wellhead

1,0 x RWP

1,5 x RWP

NA

B

Tree Connector

1,0 x RWP

1,5 x RWP

NA

C

Valves, Valve Block

1,0 x RWP

1,5 x RWP

NA

SCSSV flow passages and seal sub (pressurecontaining)

1,0 x RWP up to RWP + 17,2 MPa (2 500 psi) max

1,5 x RWP up to 1,5 x (RWP + 17,2 MPa (2 500 psi))

NA

SCSSV flow passages and seal sub (pressurecontrolling)

1,0 x RWP up to RWP + 17,2 MPa (2 500 psi) max

1,0 x RWP up to 1,0 x (RWP + 17,2 MPa (2 500 psi))

NA

E

Debris Cap

PMR

PMR

NA

F

Crown Plugs

1,0 x RWP

1,5 x RWP

NA

G

Internal Tree Cap

PMR

PMR

NA

H

Tubing Hanger

1,0 x RWP

1,5 x RWP

NA

L1

Below installed Tubing Hanger

NA

NA

1,5 x RWP

Above Lower Crown Plug

NA

NA

1,0 x RWP

Below Lower Crown Plug

NA

NA

1,5 x RWP

Above Upper Crown Plug

NA

NA

1,0 x RWP

Below Upper Crown Plug

NA

NA

1,5 x RWP

Gallery

1,0 RWP up to RWP + 17,2 MPa (2 500 psi) max

NA

NA

D

L2

L3

L4

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Mudline Wellhead Casing Hanger Design

Rated working pressure suspension equipment

Conversion equipment

Test pressure suspension and conversion

0,67 Sy

0,9 Sy

1,0 Sy

1,35 Sy

NA

2,15 Sy - 1,2 Sy

Limiting stress values mudline suspension components

Membrane stress = Sm (where Sm + Sb < 1,0)

0,8 Sy Membrane + Bending = Sm + Sh (where Sm < 0,67 Sy) 1,2 Sy (where Sm > 0,67 Sy or < 0,9 Sy) 2,004 Sy - 1,2 Sy

NOTE 1 Stresses given in this Table shall be determined in accordance with the definitions and methods presented in annex E. The designer shall consider the effects of stresses beyond the yield point on non-integral connections such as threaded connections and latch profiles, where progressive distortion can result. NOTE 2 Bending stresses in this method are limited to lower values than are permitted by the ASME method for secondary stresses since this is a limit-based method with inherently higher safety margins. An alternative method is included in annex E to permit higher secondary stresses while controlling membrane stresses to traditional, more conservative limits.

API 17D – ISO 13628-4, Clause 10 and Annex E

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Design Validation – Performance Verification •

Both API 6A and 17D follow Annex F qualification test protocols

•

17D uses PR2, but with Table 3 for subsea assemblies

•

Based on “assumed” number of operations component is expected to see for an assumed design life – usually 20 years

•

Involves pressure cycling and temperature cycling

•

API 17D adds external pressure tests (Annex L)

•

A product of one size may be used to verify other sizes in a product family, providing the following requirements are met. –

A product family is a group of products for which the design principles, physical configuration, and functional operation are the same, but which may be of differing size.

–

The product geometries are parametrically modeled such that the design stress levels and deflections in relation to material mechanical properties must be based on the same criteria for all members of the product family in order to verify designs via this method.

–

Testing of one size of a product family shall verify products of the same size to lower pressure rating or lesser temperature classification. Products testing of two product sizes in the same family per the design restrictions as stated above qualifies the other product sizes that are between the two tested sizes to the same or lower pressure rating and same or lesser temperature classification

API 17D – ISO 13628-4

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Guideline - Guidepost Orientation – clause 8

8-5/8” diameter pipe

Guide posts numbered 1-4 with ½” wide stripes. Rule of thumb : #1 post is usually in NE quarter and number of other posts increase clockwise (BUT NOT ALWAYS – ALWAYS CHECK ORIENTATION AT THE START OF A JOB!)

½” gap

10-3/4” x .563 wall diameter pipe

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Funnel - up Guidelineless Orientation – clause 8

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