Groth 7678 - Manual (Page 4)

4
Note
When transporting the arrester, support it
with the flange in the horizontal position.
This position provides the maximum support
for the flame element winding. Lift the
assembly with the [2] lifting eyes if
applicable.
The following guidelines should be observed at
installation:
1. Remove any flange protectors and discard
all packing material.
2. Inspect the gasket seating surface of the
mating flanges. It must be clean, flat, free of
scratches, corrosion and tool marks.
3. Inspect the gasket; make sure that the
material is suitable for the application.
4. 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.
5. Center the gasket within the bolt circle.
WARNING
The lifting eyes on the element housing
are to be used for handling the housing
only during inspection and mainte-
nance. DO NOT use these eyes to lift the
entire flame arrester assembly.
6. Set the arrester on its mating flange or
nozzle. Position the lifting handles and
jacking nuts to facilitate future removal of the
flame arrester housing. Position the drain
and instrument ports to provide proper
access and function. (See Maintenance
Instructions). Install the studs and tighten
nuts hand tight.
7. Torque all fasteners to half the value listed in
Table 1 in a staggered, alternating pattern to
provide an evenly compressed gasket joint.
Table 1
PIPE FLANGE STUD TORQUE CHART
Lb.Ft. [Nm]
Size
(mm)
Torque
Flat face Raised face
2”
(50mm)
60 [82] 60 [82]
3”
(75mm)
60 [82] 60 [82]
4”
(100mm)
60 [82] 60 [82]
6”
(150mm)
105 [143] 105 [143]
8”
(200mm)
105 [143] 105 [143]
10”
(250mm)
140 [190] 170 [231]
12”
(300mm)
140 [190] 170 [231]
• (Torque is an average value based on a
nitrile binder synthetic gasket, 1/32" thick
and lubricated threads).
8. Make up the final torque and check that no
further nut rotation occurs at the specified
torque value.
MAINTENANCE
For maximum operating efficiency the element
of a flame arrester must be inspected and
maintained at regular intervals. Frequency of
inspection should be based on the experience
gained in each application. Inspection of wetted
components is recommended at least once per
year or any time that one of the following
conditions occur:
• Excessive pressure drop is encountered at a
known flow rate.
• A flame front is detected.
Maintenance is accomplished by removing the
element assembly for inspection and cleaning or
replacement.