Groth 7658A - Manual (Page 3)

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The flame arresters consist of two main
components, the arrester bases and the flame
element housing assembly. The bases serve as
the connecting interface to the piping system.
The housing retains and supports the flame
element. Both components are essential in
stopping the passage of the flame.
The flame element is comprised of small parallel
passageways aligned so that an approaching
flame front is slowed down and then quenched
before it can propagate to the protected side of
the device. All Groth flame elements utilize
spiral wound, crimped ribbon constructed of
corrosion resistant materials, to insure the best
flame quenching performance with minimum
pressure drop. The element is supported by rigid
beams, securely welded into the housing to
withstand the extreme pressures of an overdriven
detonation. Each nominal size arrester can be
supplied with various diameter elements to
provide the required flow capacity.
The bases must also withstand the detonation
pressures while conveying the burning vapors
and flame front to the element. Depending on
the design of the system in which it is used, the
arrester bases can include optional ports for
thermocouples or pressure monitoring devices.
These devices can activate warning or shutdown
systems if abnormal conditions are detected.
Both bases may be equipped with large diameter
inspection/clean-out ports for in-line
maintenance of the element, or element removal
may be required for inspection/maintenance.
Note
A Type II detonation flame arrester cannot
withstand a continuous flame, and must have
a continuous flame monitoring system
capable of shutting down the vapor flow
within the time specified on the arrester
nameplate.
WARNING
A detonation flame arrester may be exposed
to instantaneous pressure spikes in excess of
1000 PSI. Any instrumentation attached to
the arrester must be capable of continued
operation in this environment.
INSTALLATION
Operating Conditions:
Based on the testing conditions, this series of
detonation flame arrester may be installed in
piping systems where:
1. The MESG of the vapor constituent(s) is
greater than or equal to .036" (0.92 mm).
2. System operating pressure is less than or
equal to 15.7 PSIA (1.08 Bar).
3. Normal operating temperature is between -
13 o F (-25 o C) and 140 o F (60 o C).
4. The piping system in which the detonation
arrester is to be installed must not exceed the
arrester flange size.
WARNING
The 7658A detonation flame arrester may NOT
be effective in stopping flame propagation in
systems which contain vapors with an MESG
less than 0.036" [0.92 mm] or when any of the
operating conditions are exceeded.
All Groth Detonation 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 detonation 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.