46
Torque Values
Stud Thread
Torque (Ft. Lbs.) to Produce Stress in Stud Bolts
30 Ksi Stress
(B8M, B8MA)
45 Ksi Stress
(B7M)
60 Ksi Stress
(B7)
Material Codes
069, 269, D53, D59
Material Codes
235, 551
Material Codes
114
7/16 - 20 20 30 40
1/2 - 13 30 45 60
5/8 - 11 60 90 120
3/4 - 10 100 150 200
7/8 - 9 160 240 320
1 - 8 240 370 500
1 1/8 - 8 355 533 710
Table H.1
Valve Component Bolting Procedure:
1. Blow down Ring Lock screw:
Lubricate lock screw with Bostik Never-Seez, except in oxygen service
where Holocarbon 25-5s or equivalent is used. Torque lock screw to:
80-100 Ft. Lbs.
2. ½"-14 NPT Pipe Plug (P/N: 5098):
Lubricate threads with: Bostic Never-Seez. Torque pipe plug to:
18-22 Ft. Lbs.
3. SAS Jam Nut to Bonnet:
Lubricate threads with Bostik Never-Seez, except in oxygen service
where Holocarbon 25-5s or equivalent is used. Torque jam nut to:
25-30 Ft. Lbs.
Appendix H: Torque Requirements
This appendix contains the minimum torquing requirements for body/
bonnet and bolted/packed cap for Farris pressure relief valves.
Valve: Body/Bonnet - Bolted/Packed Cap Procedure
(See figures to the right):
1. Valve studs, nuts and bolts shall be visually inspected to ensure they are
free of rust, dirt, or physical damage.
2. Install nuts on the studs finger-tight.
3. Tighten the nuts per the sequence shown in the diagram to the right to
approximately one-half the torque value shown in Table H.1. Repeat the
same sequence of tightening to the torque value shown in Table H.1.
Then starting with the Nut Number 1, tighten each nut in order in a
clockwise or counterclockwise direction to the value shown in Table H.1.
(16 stud pattern, similar to 12 stud pattern).
4. Bolting torque tolerance: ±10%. Measure torque with a calibrated
torque wrench or torque device.
4 Studs
1
2
3
4
6 Studs
1
2
3
4
6
5
8 Studs
1
2
3
8
4
6
7
5
12 Studs
1
2
3
8
4
9
6
7
5
10 11
12
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