PVI Industries QUICKDRAW PV500-26 - Manual (Page 12)

QUICKDRAW

Boiler Water Heater
12
PV500-26 06/12
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: Follow the proper tightening sequence,
torque increments and maximum torque values.
Failure to follow these requirements can cause non-
repairable damage to gaskets or heat exchangers
and can result in leaking, property damage,
personal injury or loss of life
.