Groth 7618 - Manual (Page 8)

Page 8 of 16
5. On the remaining studs, loosen the housing nuts incrementally while advancing the spreader nuts to
separate the bases. When the bases are separated sufficiently to remove the housing, tighten the
housing nuts so the bases form a rigid assembly when the housing is removed.
6. If a vertically mounted flame arrester is used to support a relief valve or similar equipment, tightening
the housing nuts after separating the bases will provide sufficient support for the relief valve.
7. Remove the housing assembly for inspection. Visually inspect the flame element and supporting grids
for damage or corrosion build-up from both sides. If the flame element appears to be damaged, it
should be replaced immediately.
WARNING: Failure to replace a damaged flame element can render the flame arrester ineffective
8. Verify that the element openings are not clogged by viewing a light source through the element
passages. If the flame element is dirty or clogged 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.
CAUTION: If compressed air, steam, or high pressure water jet is used to
clean clogged element passageways, restrict access to the area to prevent
injury from blown debris exiting the element. Use appropriate personal
safety equipment for the cleaning method used.
TIP: The best method of cleaning and frequency should be based on the
experience gained in each application.
9. Inspect the sealing gasket for damage and replace if necessary. (See Table 6 for replacement gasket
part numbers.
10. Install a gasket in the counter bore of each base. Position the element housing to align with the
counterbores. Insert the studs and torque all fasteners to half the value listed in Table 2 in a
staggered, alternation pattern to provide an evenly compressed gasket joint.
If the arrester is in high temperature service or stainless steel external studs and nuts are used, apply
an anti-seize compound such as moly-disulfide to all threaded components.
11. 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.