QUICKDRAW→ Boiler Water Heater

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

Recommended

 

 

Torque

Torque

Max.

Dia.

ft-lbs

Increment

Torque

1/2"

40

5

60

5/8"

80

5

120

 

 

 

 

SPIRAL WOUND GASKETS

 

Bolt/Stud

Recommended

 

 

Torque

Torque

Max.

Dia.

ft-lbs

Increment

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.

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