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Volume-II of IV - GAIL

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MECON LIMITED<br />

REGD. OFF: RANCHI (BIHAR)<br />

c:\fateh\standard\gas-b&n.wp<br />

PROCESS & PIPING<br />

DESIGN SECTION<br />

NEW DELHI<br />

STANDARD SPECIFICATION<br />

TITLE GASKETS, BOLTS AND NUTS SPECIFICATION NO. PAGE 3 OF 3<br />

MEC/S/05/62/19 REVISION 0<br />

TECHNICAL NOTES FOR BOLTS & NUTS<br />

1. Materials for stud bolts, M/C bolts, jack screws and nuts shall conform to the codes/<br />

standards and specifications given in the Pipeline Material Specification.<br />

2. Test reports shall be supplied for all mandatory tests as per the relevant material<br />

specifications.<br />

3. All bolting shall be as per ANSI B18.2.1 for studs, M/C Bolts and Jack screws and ANSI<br />

B18.2.2 for nuts.<br />

4. Threads shall be unified (UNC for = 1" dia and BUN for C1" dia) as per ANSI B1.1 with<br />

class 2A fit for studs, M/C bolts and jack screws and class 2B fit for nuts.<br />

5. Stud bolts shall be fully threaded as specified in the standards, codes.<br />

6. The nuts shall be double chamfered, heavy hexagonal type.<br />

7. Heads <strong>of</strong> jack screws and M/C bolts by heavy hexagonal type. Jack screw end shall be<br />

rounded.<br />

8. Each size <strong>of</strong> studs & M/C bolts with nuts and jack screws shall be supplied in separate<br />

bags marked with size and material specifications.<br />

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

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