Groth 7688 - Manual (Page 4)

4
WARNING
The 7688 in line deflagration flame arrester
may NOT be effective in stopping flame
propagation in systems which contain
vapors with an MESG less than 0.036" [0.90
mm] or when any of the operating conditions
are exceeded.
All Groth in line deflagration flame arresters are
bi-directional and can be used in vertical or
horizontal piping systems.
WARNING
The flame arrester housings or adjacent
piping may have various pipe taps for
pressure sensing, temperature sensing,
condensate drainage, etc. Never connect
such taps to a common line or system as
this could provide a flame bypass around the
flame arrester element.
This series of flame arresters all have 150#
ANSI flanges. Please follow the torque
guidelines listed in Table 1 for flange make-up
torque.
Note
When transporting the arrester, support it
with the flanges in the horizontal position.
This position provides the maximum support
for the flame element winding. Lift the
assembly with the [2] lifting eyes attached to
the bases 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 between its mating flanges
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.
• Note: When installing model 7688 in a
horizontal pipeline, use the lowest 1” ports to
drain condensed vapors from the housing.
Note previous warning when connecting the
drain piping.
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).