Valve general requirements

1. List of General requirements from MOTS 16
Sr. No Section.no
1 Table 5.3.2Service code shall be a part of valve spec Additional requirements
2 7
Ball, plug and gate valves shall be designed allowing design pressure to be applied from either end or from
both ends simultaneously. Lifting lugs for >250 kg
3 7
Design have provision of automatic internal bleeding of the cavity for double seated ball valve. For any
specifice service? 6" & > shall be self supporting
4 7 Except check valve, design shall allow installation in any possible position GB shall be suitable for installation offshore north sea
5 7
Blind plugs for drain and vent, etc., shall be of material not less noble than the valve body material and shall
be AISI 316 SS minimum
6 7 Threaded body connections shall be National Pipe Taper Thread (NPT). Refer table 7.1.1 for size restriction
7 7 Max force to operate manual valve shall be 350Nm else GO
8 7
Trunion Mounting is acceptable in lieu of Floating ball. Refer table 7.1.2.1 for size restriction. 8"> shall have
seat sealant injection or equal to achive emergency sealing
9 7 GO shall have position indication with open and close position clearly marked
10 7 Lever length twice F-F (Max), Wheel dia <800mm
11 7 GO valves 100 truns (max) of Handweel from fully open to close. Vendor to provide number of turns in bid
12 7
Manual operated butterfly valves < 4” shall be delivered with a lever. Valves ≥ 4” shall be provided with a
gear operator
13 7 Butterfly valves shall not be permitted in hydro carbon service
14 7
Wafer check valves for installation with flow vertical downwards shall have individually designed springs
(Dual Plate?)
15 7 Needle valves shall have minimum 5mm (3/16”) internal bore
16 7
Needle valves shall have an integral shoulder located below the packing, to prevent the needle from blow
out. The shoulder shall not form part of the valve packing arrangement
17 7 Needle valve shall be a bolted bonnet design with minimum 4 bolts bolting the bonnet into the valve body
18 7
Plug valves shall be of the inverted plug "Pressure Balanced Design", in which the line
pressure is used to keep the plug in a balanced condition
19 8 NDT requirement shall be as per sec 8.1.1 of MOTS 16
20 8
The standard grease nipple shall be of the same material as the valve body or nobler to
avoid corrosion. The material shall be AISI 316 SS minimum.
21 8
For <=2" , Rolled or forged bar may be used provided bar of initial dia <=8"
22 8
All CS valves shall meet the requirements of ISO 15156-2: “Materials for Use in H2Scontaining Environments
in Oil and Gas Production”, Annex A, SSC region 3.
23 8 IGC- ASTM A262 E for SS valves. ASTM G48-A for SS 6%MO, SSSD-22 Cr & 25Cr
24 8
For SS 6% MO, Castings with PREN >= 40 shall not be used for butt weld components, due to risk of micro
cracking in the Heat Affected Zone (HAZ) in weldments
25 8 For cast SS 316/316L, Strauss Test as per ASTM A262
26 8 For 22% & 25 % Cr Duplex SS, Penetrant testing S6 shall apply on surface
27 8 Age/precipitation hardened bar shall not be used for fabrication of bolts
28 8
Bolts :Sizes M12 or ½" or larger shall be hot dip galvanized according to ISO 10684 Sizes up to M12 or ½",
zinc electroplate according to ASTM B633.
All non-pressure retaining and internal bolts and nuts shall be homogenous with the
valve material and fit for purpose.
29 8
Gaskets: Asbestos containing material shall not be used.
Graphite based gaskets, seals and packing materials shall not be used in sea water service due to crevice
corrosion
30 8
Seals shall be Anti-Explosive Decompression resistant (AED) in design and material and
AED elastomer seals. Seal thickness larger than 6 mm requires particular qualification.
AED shall not be permitted for methanol service
31 10
All steel surfaces exposed to the environment (valve, actuator, transition pieces, etc.)
shall be painted in compliance with MOG-FP-MET-STD-0034: “MOTS-34 Protective
External Coating of Steel”.
Nameplates and other attachments shall be mounted AFTER the final coating layer has
been applied
32 11 valve Certification Class 1 600# & >, Class 2, 300#<, Class 3 all other