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TM 10-4930-369-13&P
13. Using a torque wrench and turning the nuts, assemble the lange union. Tighten each lange nut according
to the sequential number pattern in Figure 13. Tighten completely through the pattern before changing to
a higher torque. Establish an initial sealing surface pressure by tightening to an initial torque value of 5
pounds-feet; then increase tightening torque in increments of about 5 pounds-feet or less to 23 pounds-feet.
Do not exceed the maximum torque value of 30 pounds-feet.
Figure 13. Flange Bolt Tightening Sequence.
14. Tighten four pump mounting bolts securely (Figure 12, Item 3).
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