Groth 7618 - Manual (Page 5)

Page 5 of 16
The following guidelines should be observed at installation:
WARNING: Groth Corporation's flame arresters have been tested by
Factory Mutual Research. To maintain the approval classification, all
arresters must be installed within 10 pipe diameters of the open end of the
vent pipe.
1. Remove any flange protectors and discard all packing material. Inspect flange faces and flame
element for damage or contamination.
2. Inspect the gasket seating surface of the tank nozzle or piping. It must be clean, flat, free of
scratches, corrosion and tool marks.
3. Aluminum flame arresters are furnished with flat face flanges; they should only be installed on
a mating flat face flange with a full face gasket.
WARNING: Installation of an aluminum arrester in piping with raised face
flanges can cause permanent distortion of the base flanges. This may
result in vapor leakage at the flange connection.
Adjacent piping must have appropriate structural support to prevent
excessive loads on the flame arrester flanges.
4. Inspect the gasket; make sure that the material is suitable for the application. Center the
gasket within the bolt circle.
5. Set the arrester between its mating flanges or on the nozzle. Position the lifting handles and
jacking nuts to facilitate future removal of the flame arrester housing (See Maintenance
Instructions section). Install the studs and tighten nuts hand tight.
WARNING: The handles on the arrester housing are to be used for
handling the element only during inspection and maintenance. DO NOT
use the handles to lift the entire flame arrester assembly.
Notes:

When installing Model 7628 in the horizontal position, the
eccentric portion of the housing must be positioned
upward (See Page 14). In this position condensation will
tend to move in the direction of flow and not collect in the
element.

Leave space behind mating pipe flange for insertion of
studs, as there may not be sufficient space to insert studs
from the flame arrester side.
6. Torque all fasteners to half the value listed in Table 2 in a staggered, alternating pattern to
provide an evenly compressed gasket joint.
7. Make up the final torque and check that no further nut rotation occurs at the specified torque
value.