Groth 7688 User Manual

Page 5

7. Torque all fasteners to half the value listed in

Table 1 in a staggered, alternating pattern to
provide an evenly compressed gasket joint.

8. Make up the final torque and check that no

further nut rotation occurs at the specified
torque value.

WARNING

After installation, all connections must be
inspected for vapor leakage. This may be
accomplished by static test, gas detector, or
"bubble" test using Snoop or similar liquid.

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.

CAUTION

The connecting pipeline must be free of all
hazardous or flammable vapors before
inspection

procedures

begin.

Before

disassembling arrester consult Material
Safety Data Sheets (MSDS) for all products
that the arrester was exposed to in service.
The

components

should

cleaned

according

MSDS

procedure.

Take

appropriate safety precautions regarding eye
protection, skin contact & respiration.

The element cannot be removed in-line with
the integrated thermowell in place. Remove
the well completely by backing-out the
threaded connection in the housing. The well
must be re-installed in the same housing
with an appropriate thread sealant/lubricant.

1. When removing the element housing for

maintenance,

support

the

weight

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 mainte-nance. DO
NOT use these eyes to lift the entire 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

spreader

tools,

necessary, to safely secure the base halves
so the housing is free for removal.

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
attached to 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:

This manual is related to the following products:

7698