vol

SPECIFICATION FOR

VENTS, DRAINS AND WELLS

SPECIFICATION NO.: MEC/S/05/62/15

(PROCESS & PIPING DESIGN SECTION)

MECON LIMITED DELHI 110 092

D:\Technical Specifications & Standards\019 - Gasket Nuts & Bolts.doc

PROCESS & PIPING DESIGN SECTIONMECON LIMITEDDELHI - 110 092

TECHNICAL SPECIFICATIONFOR

GASKET, BOLT & NUTS

SPECIFICATION NO.: MEC/S/05/62/019

MECON LIMITEDDelhi

PROCESS & PIPINGDESIGN SECTION

DELHI

SPECIFICATIONFOR

GASKETS, BOLTS & NUTS

SPECIFICATION NO. : MEC/S/05/62/019 REV-0 Page 1 of 3


C O N T E N T S

1.0 GASKETS

2.0 NUTS AND BOLTS

PREPARED BY CHECKED BY APPROVED BY

MECON LIMITEDDelhi


DELHI

SPECIFICATIONFOR




TECHNICAL NOTES FOR GASKETS

1. Materials for gaskets shall conform to the codes/ standards and specifications given inthe Piping Material Specification.

2. Asbestos filler for spiral wound gaskets shall not have any colour or dye.

3. Each size of gaskets shall be supplied in bundles labelled with size, rating and materialspecifications.

4. All gaskets shall be inspected as follows :-

a) Visual Inspection

b) Dimensional Check

5. Material test certificates for all mandatory tests as per the relevant materialspecifications and other inspection reports shall be furnished before despatch ofmaterial.

6. All items shall be inspected and approved (Stagewise) by Purchaser's Representative.

MECON LIMITEDDelhi


DELHI

SPECIFICATIONFOR




TECHNICAL NOTES FOR BOLTS & NUTS

1. Materials for stud bolts, M/C bolts, jack screws and nuts shall conform to the codes/standards and specifications given in the Pipeline Material Specification No. 2784-00-71-S-109.

2. Test reports shall be supplied for all mandatory tests as per the relevant materialspecifications.

3. All bolting shall be as per ANSI B18.2.1 for studs, M/C Bolts and Jack screws and ANSIB18.2.2 for nuts.

4. Threads shall be unified (UNC for = 1" dia and BUN for C1" dia) as per ANSI B1.1 withclass 2A fit for studs, M/C bolts and jack screws and class 2B fit for nuts.

5. Stud bolts shall be fully threaded as specified in the standards, codes.

6. The nuts shall be double chamfered, heavy hexagonal type.

7. Heads of jack screws and M/C bolts by heavy hexagonal type. Jack screw end shall berounded.

8. Each size of studs & M/C bolts with nuts and jack screws shall be supplied in separatebags marked with size and material specifications.

9. All items shall be inspected and approval (Stagewise) by Purchaser's Representative.

PIPING MATERIAL SPECIFICATION

SPECIFICATION NO. MEC/23JT/05/21/S/021, Rev-1

(PROCESS & PIPELINE DESIGN SECTION)MECON LIMITED

DELHI - 110 092

TABLE OF CONTENTS

1.0 SCOPE

2.0 CODES AND STANDARDS

3.0 MATERIAL SPECIFICATION

4.0 CLASS DESIGNATION CODE

5.0 PIPELINE

6.0 PIPING

7.0 FITTINGS

8.0 BENDS

9.0 FLANGES

10.0 GASKETS

11.0 BOLTING

12.0 THREAD SEALANT

13.0 VALVES

14.0 QUICK OPENING END CLOSURE

15.0 HYDROTESTING VENTS AND DRAINS

TABLE-1 PIPE WALL THICKNESS DETAILS FOR MAINLINE

TABLE-2 INDEX OF PIPING MATERIAL SPECIFICATION

ANNEXURE-1 PIPING MATERIAL SPECIFICATIONS AS PER TABLE - 2

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1.0 SCOPE

This specification covers the requirements of various piping materialsused in low temperature piping/ pipeline system handling regasified liquidnatural gas (RLNG) and associated utilities in the pipeline.

2.0 CODES AND STANDARDS

2.1 Pipeline and terminal facilities envisaged as a part of this project shall bedesigned and Engineered primarily in accordance with the provision ofASME B 31.8- Gas Transmission and Distribution piping system latestedition.

2.2 All codes standards and specifications referred herein shall be the latestedition of such documents.

2.3 For sake of brevity, the initials of the society to which the codes arereferred are omitted in the specification, for example, B16.5 is a codereferring to ANSI/ ASME, A 105 is a code referring to ASTM.

2.4 In addition, MECON specifications for various piping and pipelinematerials shall also be applicable.

3.0 MATERIAL SPECIFICATION

Piping material specifications are classified for the general purpose ofselection of material for the class of services. The maximum designpressure and design temperature consideration as per ASME B16.5/B16.34 or part of it together with the fluid in line governs the selection ofmaterial specifications. Deviation of materials from class specificationsmay occur due to specific design condition or availability. These deviationsare permissible if they are equal or better than the individual classrequirements.

4.0 CLASS DESIGNATION CODE

The piping class designation consist of three digits numbering systemmade up of letter, number and letter e. g. A1A/ A4A, B1A/ B4A, D1A/ D4A,etc as follows:

First letter indicates ANSI class rating e. g.

A-Class 150B-Class 300D-Class 600


The middle number indicates differences in the specification within thesame rating and material.

The last letter indicates type of material e. g.

A-Carbon Steel

5.0 PIPELINE

The material for linepipe shall be of API 5L Gr X65 and pipe wall thicknessshall be of various class locations as per the requirements as indicated intable-I.

6.0 PIPING

6.1 Carbon steel pipe shall be made by open hearth, electric furnace or basicoxygen process only. The steel used shall be fully killed and made withfine grain structure. The grade and wall thickness of various sizes of pipesshall be as per piping material specification for the applicable class.

6.2 Pipe dimension shall be in accordance with ANSI B 36.10 for carbon steelpipes and ANSI B 36.19 for stainless steel pipes.

6.3 All pipe threads shall conform to American Standard taper as per ANSI B1.20.1 NPT, unless otherwise specified.

6.4 For butt weld end, bevel shall be in accordance to ANSI B 16.25/ API 5Las applicable.

7.0 FITTINGS

7.1 Fully killed carbon steel shall be used in the manufacture of fittings. The fittings shall have carbon equivalent not exceeding 0.45, based on check analysis.

7.2 Threaded joints, if used shall conform to American Standard taper as perANSI 1.20.1 NPT.

7.3 Dimension of socket weld/ screwed fittings shall conform to ASME B 16.11

7.4 Bore of socket welded fittings shall suit O. D. of pipe and its thickness.

7.5 Dimensions of butt welded carbon steel fittings for sizes not covered in toASME B 16.9/ MSS-SP-75 shall conform to MSS-SP-48.


7.6 Butt welding ends shall conform to ANSI B 16.25/ API 5L. in case ofdifference in thickness of matching ends, requirements of ASME B 31.8shall apply.

7.7 Integrally reinforced forged branch fittings such as sockolet, threadolet,weldolet, nippolet etc. shall be as per MSS-SP-97. Fittings not covered inASME B 16.9 and MSS-SP-97, shall conform to manufacturer’s standard.

7.8 Fittings thickness tolerances shall match pipe thickness tolerance.

8.0 BENDS

8.1 Unless otherwise specified for terminal piping, the elbow of radius R = 1.5D shall only be used.

8.2 For mainline cold field bends with radius R = 30D (where D is pipenominal dia) for up to 16” NB shall be used. Limited use of long radiusbends (R = 6D) may be permitted for reason of space constraints.

9.0 FLANGES

9.1 Flange pressure - temperature rating shall conform to ASME B 16.5 ratingunless otherwise specified.

9.2 Dimensions pf flanges shall be in accordance with ANSI B 16.5/ MSS-SP-44 as applicable..

9.3 Neck of Weld Neck (WN) flanges to suit pipe bore and thickness.

9.4 Bore of Socket Welded (SW) flanges shall suit pipe O.D. and its thickness.

9.5 Threads for screwed flanges if used shall conform to American Standardtaper as per ANSI B 1.20 1 NPT.

9.6 Sizes for blind flanges shall be indicated by nominal pipe sizes.

9.7 Carbon steel flanges faces shall have serrated finish or smooth finish asindicated in the material specification. Flanges faces shall have serratedfinish to 250-500 microinches AARH as per ANSI B 16.5 for ANSI class150# and smooth finish to 125-200 microinches AARH as per MSS-SP-6for ANSI class 300# & 600#.

9.8 Butt welding ends of WN flanges shall conform to ANSI B 16.25.


9.9 Spectacle blind/ spacer & blinds shall be in accordance with ASME B16.48/ Manufacturer’s Standard. Spectacle blind shall be used for sizesupto 8” NB and for 10” & above spacer & blind shall be used.

9.10 Two jack screws 180° apart shall be provided for all spectacle blindassemblies. The jack screws shall be as per MECON’s standard, attachedwith this specification.

10.0 GASKETS

10.1 Spiral wound metallic gaskets shall conform to B 16.20 and shall beprovided with compressed asbestos filler. All spiral wound gaskets shallbe provided with carbon steel centering ring. Gasket thickness shall be asindicated in piping material specification for the applicable piping class.

10.2 Non metallic compressed asbestos gaskets for flanged pipe joints shallconform to B16.21. Unless specified otherwise, asbestos material shallconform to IS 2712 Gr. O/1. Gasket thickness shall be as indicated inpiping material specification for the applicable piping class.

11.0 BOLTING

11.1 Nuts for stud bolts shall be American Standard Hexagonal Heavy seriesand double chamfered.

11.2 Dimension and tolerances for stud bolts and nuts shall be as per ANSI B18.2.1 and 18.2.2 with full threading to ANSI B 1.1 Class 2A thread forbolts and Class 2B for nuts. Diameter and length of stud bolts shall be asper ANSI B 16.5 with full threading.

11.3 Threads for nuts shall as per ANSI B 1.1, as follows:

Nuts for stud dia ¼” to 1” : UNC-2BNuts for stud bolts dia 11/8” to 3 ¼” : 8UN-2B

11.4 Threads for stud bolts shall be as per ANSI B 1.1, as follows.

Studs bolts dia ¼” to 1” : UNC-2AStud bolts dia 11/8” to 3 ¼” : 8UN-2A

11.5 Heads of jack screws shall be heavy hexagonal type. Jack screw end shallbe rounded. Stud bolts shall be fully threaded with two hexagonal nuts.

12.0 THREAD SEALANT

12.1 Threaded joints shall be made with 1” wide PTFE Jointing tape.


13.0 VALVES

13.1 Valve ends shall be as per piping material specifications.

13.2 Flange dimensions and face finish of flanged end valves shall confirm toclause 9.0 of this specification.

13.3 Butt welding ends of Butt Welded valves shall confirm to ANSI B 16.25.

13.4 Face to face and end to end dimensions shall confirm to applicablestandards.

13.5 Buried valves on mainline shall be provided with stem extension, sealant,vent/drain & shall have butt welded ends.

13.6 Sectionalizing Valves (Block valves) and other isolation valves on themain pipeline shall be ball valve and have butt welded ends and shall befull bore to allow smooth passage of cleaning pigs as well as intelligentpigs.

13.7 Unless specified otherwise. Valves shall confirm to the followingstandards:

Screwed / Socket welded / Flanged end valves (1 ½” and below)

Ball Valves - BS 5351Plug Valves - BS 5353Check Valves - BS 5352Globe Valves - BS 5352Gate Valves - API 602

Flanged / Butt weld end Valves (2” and above)

Ball Valves - API 6DPlug Valves - API 6DCheck Valves - API 6DGlobe Valves - BS 1873Gate Valves - API 6D

13.8 Valve operators shall be as indicated below, unless specified otherwise inthe P&ID.

a) Gate and Globe Valves

i) For ANSI class 600 - Hand Wheel operated for size <10”NB.


Gear operated for size >12” NB.

b) Ball and Plug Valves

i) For ANSI class 150, 300, 600 – Wrench operated for size <4”NB.Gear operated for size >6”NB.

14.0 QUICK OPENING END CLOSURE

Quick opening end closure to be installed on scraper traps shall be equipped withsafety locking devices in compliance with section VIII, division 1, UG-35.2 ofASME Boiler and Pressure Vessel code.

15.0 HYDRO TESTING VENTS AND DRAINS

High point vents and low point drains required for the purpose of hydro testing ofterminal shall be of size 0.75” and consist of sockolet, gate valve, flange & blindflange.

16.0 PIPELINE SPECIALITY ITEMS

Pipeline Speciality items viz., Scrapper Traps, Flow Tee, Insulating Joints, LRbends shall be as per respective data sheets and specifications.

TABLE-1MAIN LINE PIPE MATERIAL

Line Pipe Material and thickness shall be as under:For this Project, mainline shall be API 5L Gr. X-65, thickness 6.4mm/7.1mm/8.7mm.

TABLE-2INDEX OF PIPING MATERIAL SPECIFICATIONS

PipingClass

Service Designpressure

bar

DesignTemp. °C

C .A. inmm

BasicMaterial

DesignCode

D4A(600#)

RLNG 95 -20 to 60 1.5 ASTMA333 Gr 6

ASME B31.8

vol

Documents

data vijyant gspl tender const vol ii

spec pdf pdf final 021

25 api 5l

butt welding ends

american standard taper

butt welded ends

heavy hexagonal type

mecon limited delhi