Spe 77-162 - Valves and Accessories

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MESC ADDITIONAL REQUIREMENT Revision: 14 November 2006

SPE 77/162 Page 1 of 9

This document is restricted. Neither the whole nor any part of this document may be disclosed to any third party without the prior written consent of Shell Global SolutionsInternational B.V., The Netherlands. The copyright of this document is vested in this company. All rights reserved. Neither the whole nor any part of this document may bereproduced, stored in any retrieval system or transmitted in any form or by any means (electronic, mechanical, reprographic, recording or otherwise) without the prior writtenconsent of the copyright owner.

VALVES AND ACCESSORIES

Slim-line single isolation valves within a mono flange body, in gate, globe and ball valvestyles, design to ASME B16.34, suitable for open-ended applications.

Size range: DN 15-DN 50, full and reduced bore, ASME classes 150 - 2500.Body materials: carbon, low alloy and high alloy steels.Valve bodies with flange / flange or flange / threaded ends and soft or metal seated.

1 ScopeThis specification shall be used for single isolation valves used in non in-line applications(i.e. drain, vent and/or instrument branches) where an optimum compactness and minimumvalve weight is required to minimise the bending moment on branch connections andstandard face-to-face dimensions are not essential.

In this specification the slim-line single isolation valve (hereinafter referred to as "valve")means a single gate, globe or ball valve within a mono flange body.

2 REFERENCES

In this specification, reference is made to the following publications:

NOTE: Unless specifically designated by date, the latest edition of each publication shall be used,together with any amendments/supplements/revisions thereto.

API 6D Specification for pipeline valves(gate, plug, ball and check valves).

API SPEC 6FA Specification for fire test for valves

API 598 (8th edition,May-2004)

Valve inspection and testing

ASME B1.20.1 Pipe threads, general purpose (inch).

ASME B16.5 Pipe flanges and flanged fittings

ASME B16.34 Valves, flanged, threaded and welding end

ASME B 31.3 Process piping

ASME section II Part D ASME boiler and pressure vessel code, Material properties

ASME VIII Division 1 ASME boiler and pressure vessel code, Section VIII, Division 1:Rules for construction of pressure vessels

BS 6755-2 Testing of valves; Part 2: Specification for fire type testingrequirements

ISO 10497 Testing of valves; fire type testing requirements

ISO 15761 Steel gate, globe and check valves for sizes DN 100 and smallerfor the petroleum and natural gas industries.


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NACE MR 0175(Edition 2002)

Standard material requirements; Metals for sulphide stresscracking and stress corrosion cracking resistance in sour oilfieldenvironments.

S 37.808. Shell standard drawing for parallel threaded connections.

DEP 30.10.02.13-GEN Non-metallic materials - selection and application.

3 DESIGN

3.1 GENERAL DESIGN CRITERIA

The minimum wall thickness of pressure containing parts (valve body), including theclosure members, shall be in accordance with ASME B16.34 table 3.

When applicable, the manufacturer shall prove by calculations to ASME boiler and

pressure vessel code Section VIII division 1 (see section UG 101) that the wall thicknesssatisfies the pressure / temperature rating of the class in ASME B16.34.

The minimum wall thickness shall never be less than 5 mm.

The pressure / temperature (P/T) rating of the valve shall be in accordance with theappropriate class for the body material in ASME B16.34.

Pressure/temperature rating of the seat.

- Metal seats: Fully rated to the class P/T rating.

- Soft seats : Shall be in accordance with the temperature ranges specified in the tableof section 4.2.

3.2 BODY

3.2.1 The body construction shall be a one-piece body.

3.2.2 Forged bodies shall be forged close to final shape.

3.2.3 Rolled or forged bar/billet with suitable heat treatment may be used (in lieu of forgedshapes) if it can be demonstrated by UT that the steel has a totally re-crystallised grainstructure free from striations inherent in rolled products.

3.2.4 Face-to-face and bore dimensions:The face-to-face dimensions shall be in accordance with manufacturers standards andshall be as short as possible.For valves with flanged / flanged connections for open-ended, drain and vent isolationapplications in nominal sizes DN 15 up to DN 50, the bore size shall be as large aspossible but at least the following minimum shall apply:

Nominalsize (DN)

Bore dimensions forgate and ball valves:

Bore dimensions forglobe valves, needle type:

15

2025

10.0 mm

12.5 mm17.0 mm

10.0 mm

10.0 mmN.A.


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4050

24.0 mm37.0 mm

N.A.N.A.

Legend: N.A. = not applicable

For valves with flanged / threaded connections for open-ended, instrument isolationapplications in nominal sizes DN 15 and DN 20, the bore size shall be as large as possiblebut at least the following minimum shall apply:- ball or gate valves : 10 mm.- globe valve, needle type: 5 mm.

3.2.5 Flange dimensions, except the thickness, shall be in accordance with ASME B16.5.

3.2.6 Flange misalignmentLateral alignment (offset of the aligned flange centrelines):- For valves DN 50 ( NPS 2): maximum misalignment = 1.5 mm (0.059 inch),- For valves> DN 50 (> NPS 2): maximum misalignment = 2 mm (0.079 inch).

Parallelism of the aligned flange faces (angular alignment):For valves with flanges DN < 650 (NPS 26) to ASME B16.5 the maximum misalignment =2.5 mm/m (0.03 in/ft).

The surface finish of the nut bearing area at the back face of flanged valves shall beparallel to the flange face within 1.

3.2.7 Mono flange valves with flanged / flanged ends may be used as:- vent or drain valves (in which case they shall be fitted with a blind flange), or- flanged pressure instrument branch valves.

To enable removal of the blind flange with the mono flange valve staying in place, themono flange valve shall be provided with full thread engagement studs screwed in the bodyand positively locked in position with pins.

The studs shall be supplied by the valve manufacturer and shall have a length sufficient toplace the mono flange between a welding neck flange and a blind flange of the samepressure rating to ASME B16.5, using spiral wound gaskets with guide rings with athickness of 3.2 mm.

The protruding length of the studs (not incorporating the height of the raised face of theassembly) shall be as follows:

Nominal

Size (DN)

Class

150

Class

300

Class

600

Class

900-1500

Class

2500

1520254050

32 mm38 mm38 mm38 mm44 mm





3.2.8 Threaded connections

Threaded end connections shall be NPT female in accordance with ASME B1.20.1 orfemale ISO parallel thread conforming to Shell standard drawing S 37.808.Threaded end connections shall be locked in position and shall have a minimum rating

equals the hydrostatic test pressure of the valve body.


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3.3 SEAT RINGS

3.3.1 Metal seated rings

Design details and manufacturing procedure of swaged, rolled and pressed-in metal seatrings may be accepted, provided manufacturer/supplier supplies proof of previous approvalby Shell for the proposed method.Screwed-in metal seat rings shall be secured.An integral metal seat ring shall be provided in globe valves when the needle disk isintegral with the stem.

3.3.2 Soft-seated seat rings shall be replaceable.

3.4 BODY / BONNET CONNECTIONS:

The following body / bonnet connections may be used:- A: integral,

- B: welded (the weld shall be a full penetration weld),- C: flanged and bolted (the gasket shall be fully confined) or,- D: screwed-in (see notes 1 and 2).

Notes:1. Option D is not allowed for isolation valves but accepted for bleed valves.2. Screwed-in bonnets shall be properly secured. The thread shall be protected fromexposure to the medium by means of a gasket, an 'O'-ring or a metal-to-metal joint.

3.5 BACK SEAT DESIGN (NOT APPLICABLE TO BALL VALVES)

3.5.1 The valve shall be executed with a back seat bushing, which may be:- rolled and pressed-in, or:

- screwed-in.The back seat bushing shall be properly secured against loosening.

3.5.2 Back seat faces shall be conical or spherical.

3.6 YOKE DESIGN (NOT APPLICABLE TO BALL VALVES)

3.6.1 A yoke shall be either integral-with, screwed-on, screwed-in, or bolted-to the valve body.

3.6.2 A screwed-on yoke shall be properly secured.

3.6.3 When a yoke bush or sleeve is retained by means of a retaining nut, the latter shall besecured. If the yoke bush is a screwed-in type with collar then the collar shall be secured.

3.7 STEM AND STEM SEAL

3.7.1 The stem and stem head shall be of a one-piece design.

3.7.2 The weakest point of the stem shall always be outside the valve.

To ensure the smallest cross sectional area of the stem and stem head provide adequatestrength to operate the valve at the most severe design conditions as per appropriate class.It shall withstand the maximum side loads and operating torque needed to seal and tooperate against the maximum class differential pressure (applied to one or both sides ofthe valve, whichever case needs the highest torque). The manufacturer shall be able todemonstrate the adequacy of the stem design by calculations and proving stem pull tests.

These combined stresses shall not exceed the maximum allowable stresses specified inASME section II Part D.


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3.7.3 Stem blow out shall be impossible.

3.7.4 The stem retaining collar or ring shall be integral with the stem.

3.7.5 Stem retaining parts shall be capable of withstanding the full internal pressure /temperature rating of the valve and the hydrostatic test pressure of the valve body.

3.7.6 Gate and globe valve stem (rising stem)

The stem shall have an integral bevelled or spherical seat which seats on the back seatwhen the valve is fully opened.

For globe valves, the seating shall be on the stem or on the closure member nut.

The stem shall be outside screw.

The stem projection outside the yoke sleeve of the stem threads on a closed valve shall bebetween 0 mm and maximum 4 mm.

The design shall prevent disengagement of the stem from the closure member duringservice.

3.7.7 Ball valve stem

An integral ball / stem design for seat supported ball valves shall not be used.

The drive mechanism between stem and ball shall be one of the following methods:- slot and tongue.- drive pins.

- key way.

It shall be impossible to re-assemble the ball and stem such that the ball port is 90 degreesout of phase with the stem or the wrench.

Diametrical clearances of the parts around the stem shall be such that the stem can nevertouch other components that may damage the stem.

3.8 DESIGN OF CLOSURE MEMBERS

3.8.1 Closure member of gate valves

The closure member shall be of the conical plug type or wedge type.

The closure member shall be loosely attached to the stem to allow for proper seatingwithout galling between the gate and seat.

Since the conical plug or wedge will seat lower down after wear of the seating surfaces,the design shall provide adequate seating width.

Nominal size: Minimum wear travel:

DN 15 and DN 20 1.0 mm

DN 25, DN 40 and DN50

1.5 mm

3.8.2 Closure member of globe valves


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Only plug type or needle type globe valves shall be used.

The closure member shall be free to rotate on the stem. If the closure member is attachedby a nut, the nut shall be secured to the closure member.

Needle type globe valves shall be installed "tend-to-open" from the main process side.


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3.8.3 Closure member of ball valves

The ball port shall be cylindrical.

For cavity pressure relief, ball valves shall have:- a 3 mm diameter hole from ball bore to upstream side, or- self relieving seat rings.

Self-relieving seat rings shall relieve at a body cavity differential pressure not exceeding33% of the rated pressure at maximum design temperature as per the appropriate class.

3.9 OPERATIONthe type of operating mechanism shall be as per manufacturer's standard.

The maximum operating force shall not exceed 350 N.

The diameter of the hand wheel shall not exceed 200 mm.

For wrench operated valves, the stem head shall be circular and either have two flatsparallel to the valve bore or a keyway in line with valve bore, such that the wrench mustindicate the position of the closure member. Square heads shall not be used.Other constructions must be agreed with the Principal.

The wrench and the position indicator shall be:- in the direction of the valve body centreline when the valve is open and,- perpendicular to the centreline when the valve is closed.

The open and closed positions shall be clearly marked.

The buying description or data/requisition shall indicate any need for manual locking.

3.10Fire tested design

Valves containing soft (polymer) seats and seals and non-metallic materials shall be of afire-tested design and certified.

Fire testing and certification of untested valves shall be in accordance withISO 10497.

Valves ofthe same design than the ordered valve, which have been previously, fire testedand certified in accordance with ISO 10497, BS 6755 part 2 or API 6FA are acceptable.

The purchaser shall verify if the design of the ordered valve and the materials of the valveparts are of the same design and construction than those of the valve that has been fire-tested.


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4 MATERIALS

4.1 Materials shall be specified to ASTM or UNS (unified numbering system) standards.Equivalent materials, to other national standards, may be used only after approval by thePrincipal.

Bolting and other valve components shall not be galvanised or cadmium plated.

Where NACE MR 0175 is specified, this applies to process wetted parts and those withinthe pressure envelope, and bolting.

4.2 (4.2)Seats and seals ratingAdd to ASME B16.34 clause 4.2:

For the guide for material selection of the soft seats, -rings and Lip-seals reference ismade to SPE 85/202.

5 MARKING

5.1 Each valve shall be marked by electrochemical etching or, at a suitable low stress location(e.g. flange rim), by die stamping the "short code" number from the relevant MESCdescription.

An alternative method shall be used after approval from the Principal if etching ordie-stamping is considered to be illegible after painting. The valve shall also have thepurchase requisition number clearly marked or tagged.

Identification plate marking shall include the manufacturer's type or figure number.

Hard facing trim materials shall be identified, e.g. a manufacturer's code is acceptable.

5.2 The class rating and the nominal size shall be marked on the valve body.

5.3 Body / bonnet castings and forging shall have the charge or heat number and heattreatment batch cast or stamped in the material or it shall be retrievable via manufacturer'straceable records system.

5.4 The flow direction shall be marked on the body with an arrow.For ball valves the arrow shall point in the direction of the flange end in which the valveinsert is located.

6 INSPECTION AND TESTING.

6.1 GENERAL

Hydrostatic pressure testing shall be performed on the completely assembled valve.No device shall be used in testing the valve that will reduce the stress in the body. Prior tothe start of the test, each individual valve shall be operated through one completeopen/close cycle. If leakage is found, corrective action may be taken to eliminate theleakage and the test repeated at the discretion of the inspector. Alternatively the test maybe abandoned and the reasons noted by the inspector.

6.2 HYDROSTATIC PRESSURE TEST


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6.2.1 The Valve body, closure and back seat shall be hydrostatic pressure tested in accordancewith API 598. During the hydrostatic body pressure test the valve shall be in the half openposition.

6.2.2 Austenitic- and ferritic-austenitic (duplex) stainless steel valves and valves made of 9%nickel alloy shall be hydrostatic tested with potable water with a chloride content of30mg/kg or less.

All valves shall be drained immediately after the test and shall be thoroughly driedimmediately after draining.

6.2.3The minimum test duration for the body test, seat test and back seat test shall deviate fromAPI 598, table 4 as follows:

Body test Seat testmetal seated

Seat testsoft seated

Back seattest

120 s. 60 s. 60 s. 60 s.

6.2.4The maximum allowable leakage rates for closure tests shall be in accordance with API 598table 5.

7 PAINTING, PRESERVATION, SHIPPING AND STORAGE

7.1 The valve internals shall be thoroughly cleaned and dried and the surfaces shall be freefrom:- hydrostatic test fluids,- cleaning agents,- adhered scale, weld spatter, loose particles or fibres,- organic substances, e.g. grease, oil, paint and sealant.

7.2 Painting or coating shall be applied to the manufacturer's standard.High alloy steel, nickel and nickel/copper alloy valves shall not be painted.

7.3 Preparations for shipping shall be performed by the manufacturer in accordance withAPI 6D section 8. The rust preventative shall be ENSIS MD or equivalent.

7.4 Gate and globe valves shall be shipped with the closure members in the closed position,ball valves shall be open.

7.5 Prior despatch/shipment valves shall be properly packaged to ensure protection againstingress of water and dirt.

7.6 Valve ends shall be covered with closed fitting protectors (e.g. plastic caps) to protect themachined parts against dirt and moisture for at least one year in case the valve is storedoutside..

Spe 77-162 - Valves and Accessories

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