Quickdraw, Steam heater – PVI Industries Storage and Semi-instantaneous Steam Heaters PV500-25 User Manual
Page 10
QUICKDRAW
®
Steam Heater
10
CAUTION: When cleaning a tube bundle, tubes should not be hammered on with any metallic
tool and, in case it is necessary to use scrapers, care should be exercised that the scraper is
not sharp enough to cut the metal of the tubes.
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
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