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QUICKDRAW
®
Boiler Water Heater
10
4. When replacing the heat exchanger head, use a torque wrench to tighten the bolts/studs and nuts.
Use the following chart as a guide. All torque values apply to well-lubricated nut bearing surfaces.
TIGHTENING TORQUES
COMPRESSED FIBER GASKETS
Bolt
Dia.
Recommended
Torque
ft-lbs
Torque
Increment
Max.
Torque
1/2" 40 5 60
5/8" 80 5 120
SPIRAL WOUND GASKETS
Bolt/Stud
Dia.
Recommended
Torque
ft-lbs
Torque
Increment
Max.
Torque
1/2" 40 5 60
5/8" 80 5 120
3/4" 120 5 200
7/8" 200 10 320
1" 300 10 490
1 1/8" 450 10 710
1 1/4" 600 10 1000
5. Tighten uniformly and in a diametrically staggered pattern as illustrated below:
WARNING: It is extremely important to follow
a proper tightening sequence. If not followed,
the flanges can become cocked and a leak
will result. When tightening flanges with
spiral wound gaskets, if cocking occurs, the
result can be deformation and non-repairable
damage to the gaskets in addition to a
resultant leak. Any gasket leak can result in
potential injury to adjacent personnel.