REYMSA COOLING TOWERS, INC.
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40
Flange Bolt Tightening Sequence
Lubricate bolt, nut threads and washer face. Assemble the flange hand tightening all the bolts, then
start wrench tightening following the sequence of the numbers. During the sequence, keep any gap
between flanges even all around. Tightening bolts with equal pressure, progressively increasing
pressure with each complete rotation of the sequence (See Figure A-101 and Table A-3).
NOTE: Most of the short term bolt preload loss occurs within 24 hours after initial tightening. Rechecking bolt tightness may be
necessary.
Figure A-101: Tightening sequence
Ø SIZE BOLTS
TORQUE
(lb-ft)
3” 4 20
4” - 8” 8 30
10” - 12” 12 30
Table A-3: Tightening Torque
Installation
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