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Torque Values for 17D and 6BX Flange
Bolts
with Fluoropolymer Coating
for Subsea Applications For Flange Bolts and Nuts
Having Fluoropolymer Coating |
|
See
Caution Below |
| |
|
Bolt Size |
Hex Nut Size Across Flats |
Minimum 67%
Yield Stress
* |
Maximum 70%
Yield Stress * |
Bolt Tension
lbf |
Make up Torque
ft lbs |
Bolt Tension
lbf |
Make up Torque
ft lbs |
|
3/4 - 10 UNC |
1-1/4 |
23,530 |
160 |
24,538 |
167 |
|
7/8 - 9 UNC |
1-7/16 |
32,483 |
253 |
33,937 |
264 |
|
1 - 8 UN |
1-5/8 |
42,614 |
376 |
44,522 |
393 |
|
1-1/8 - 8 UN |
1-13/16 |
55,608 |
539 |
58,098 |
564 |
|
1-1/4 - 8 UN |
2 |
70,330 |
744 |
73,478 |
777 |
|
1-3/8 - 8 UN |
2-3/16 |
86,777 |
994 |
90,662 |
1,038 |
|
1-1/2 - 8 UN |
2-3/8 |
104,951 |
1,294 |
109,650 |
1,352 |
|
1-5/8 - 8 UN |
2-9/16 |
124,852 |
1,649 |
130,442 |
1,723 |
|
1-3/4 - 8 UN |
2-3/4 |
146,480 |
2,063 |
153,038 |
2,155 |
|
1-7/8 - 8 UN |
2-15/16 |
169,833 |
2,541 |
177,438 |
2,654 |
|
2 - 8 UN |
3-1/8 |
194,914 |
3,087 |
203,642 |
3,225 |
|
2-1/4 - 8 UN |
3-1/2 |
250,256 |
4,402 |
261,461 |
4,599 |
|
2-1/2 - 8 UN |
3-7/8 |
312,504 |
6,044 |
326,497 |
6,315 |
|
2-3/4 - 8 UN** |
4-1/4 |
345,310 |
7,284 |
360,772 |
7,611 |
|
3 - 8 UN** |
4-5/8 |
414,127 |
9,443 |
432,670 |
9,866 |
|
3-1/4 - 8 UN** |
5 |
489,194 |
12,013 |
511,098 |
12,551 |
|
* |
Torque ft lbs calculated to give % of
yield tension stress for ASTM A193 B7 or
ASTM A320 L7 bolts using ASTM
A194 GR. 2H nuts with Fluoropolymer coating (Coefficient of Friction =
0.07). |
|
** |
Torque calculated same as above based on reduced yield
strength of 95,000 psi. |
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CAUTION: API Spec 17D requires
flange connection bolt
tightness (tension stress in the bolt) equal to 67% to 70% of the specified minimum yield strength
of L7/B7 bolts.
Operators should limit these higher tensions to only subsea flange connections
that use BX or SBX ring gaskets and have designs that will allow face to face
make-up. When using some lubricants and/or anti-corrosion coatings on bolts, tightening
bolts consistent with the torque table shown above may in fact produce
tension closer to the actual yield strength of the bolts. Operators should use an
alternate method to
measure tension in the bolts to confirm the applicability of this table.
To see recommended bolt
tightening sequence for all API flanges, Click Here.
For more about API Spec 17D SS and
SV Flanges and connecting API 6BX Flanges Subsea, Click Here.
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