Groth 7658A - Manual (Page 5)

5
attachment to the housing handles, or lifting
eyes, and proceed as follows.
WARNING
The lifting eyes on the element housing are
to be used for handling the housing only
during inspection and maintenance. DO
NOT use these eyes to lift the entire
detonation flame arrester assembly.
2. Loosen the hex nuts and remove only those
studs or tie rods necessary to withdraw the
housing.
3. On the remaining studs, loosen the holding
nuts and use the spreader nuts to separate the
base halves from the housing. Use spacer
blocks or spreader tools, if necessary, to
safely secure the base halves so the housing
is free for removal. The Spacers on two studs
will support the housing.
CAUTION
In a horizontal line, the flame bank
assembly should be supported before
removing the studs. Use structures and
equipment suitable for supporting the
components weight. The weight is noted
on the drawing later in this manual.
4. Remove the housing assembly for inspection.
The flame element and supporting grids shall
be visually inspected for damage or corrosion
build-up from both sides. If the flame
element appears to be damaged, it should be
replaced immediately with a new one.
5. Verify that the element openings are not
obstructed by viewing a light source through
the element passages. If the flame element is
dirty it can be cleaned by one of the
following methods:
• Compressed air.
• High pressure steam or water purge.
• Solvent wash followed by compressed air.
WARNING:
Never try to clean the element by inserting
a sharp tool or probe into the orifices. Any
damage to the integrity of these passages
can render the flame arrester ineffective.
6. Inspect the sealing gasket for damage and
replace if necessary.
7. Reassemble the housing, bases and gaskets.
The support spacers will position the housing
on the base centerline. 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)
STUD SIZE TORQUE
3/4" 70 [95]
7/8" 110 [150]
1" 170 [230]
1 1/8" 240 [330]