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Groth 7678 User Manual

Page 6

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6

6. Inspect the sealing gasket for damage and

replace if necessary.

7. Reassemble

the

housing,

bases

and

gaskets. The counterbore will position the
housing on the base. Insert the studs and
torque all fasteners to half the value listed in
Table 2 in a staggered, alternating pattern to
provide an evenly compressed gasket joint.

Lubricate all studs and nuts with an
appropriate thread lubricant. If the arrester
will see high temperature service or stainless
steel fasteners are used, select an anti-seize
compound such as moly-disulfide.

8. Make up the final torque and check that no

further nut rotation occurs at the specified
torque value. The torque values are based on
original

gaskets

supplied

by

Groth

Corporation.

Table 2

HOUSING STUD TORQUE CHART

Lb.Ft. [Nm]

SIZE

(mm)

TORQUE

7678

2”

(50mm)

60[82]

3”

(75mm)

60[82]

4”

(100mm)

60[82]

6”

(150mm)

103[143]

8”

(200mm)

103[143]

10”

(250mm)

170[231]

12”

(300mm)

170[231]


Note:
When replacing a temperature sensor, make
sure that the tip of the sensor makes firm
contact with the end of the integrated
thermowell.

The table below is a partial list of vapors for which the MESG has been measured and found to be greater than or equal to
0.036" [0.90 mm]. If your system contains a gas not listed in the table, please consult the factory.

Chemical Compound

MESG*

(mm)

MESG

(Inches)

acetone

1.02

0.040

acetonitrile

1.50

0.059

ammonia

3.17

0.125

amyl acetate

0.99

0.039

butane

0.98

0.039

butyl acetate

1.02

0.040

butyl alcohol

0.94

0.037

carbon monoxide

0.94

0.037

cyclohexane

0.94

0.037

decane

1.02

0.040

ethane

0.91

0.036

ethyl acetate

0.99

0.039

ethyl nitrite

0.96

0.038

heptane

0.91

0.036

hexane

0.93

0.037

isobutyl alcohol

0.96

0.038

Chemical Compound

MESG*

(mm)

MESG

(Inches)

isooctane

1.04

0.041

isopentane

0.98

0.039

isopropyl alcohol

0.99

0.039

methane

1.14

0.045

methyl acetate

0.99

0.039

methyl alcohol

0.92

0.036

methyl ethyl ketone

0.92

0.036

methyl isobutyl ketone

0.98

0.039

octane

0.94

0.037

pentane

0.93

0.037

propane

0.92

0.036

propyl acetate

1.04

0.041

propylene

0.91

0.036

vinyl acetate

0.94

0.037

vinyl chloride

0.99

0.039

*Corrected MESG (mm), 100KpA, 20°C