Groth 7678 User Manual
Page 6
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