Groth 7598 - Manual (Page 3)

3
* Each temperature sensor with respect to connection size
has a trigger emergency function within half of the burn
time.
Must be installed with integrated temperature
sensor(s), Groth P/N 93219005 or equal.
INTEGRATED TEMPERATURE SENSORS
Flame arresters for short time burning must
be fitted with one or more integrated
temperature sensors, taking into account the
intended orientation of the flame arrester.
These arresters may be used in systems and
situations where the flow of the flammable
mixture can be stopped within one minute.
Groth model 7598 flame arresters were
tested with one Groth integrated temperature
sensors, P/N 93219005, installed on the
ignition side. All arresters are manufactured
with a minimum of one thermowell that
contacts the face of the element. Multiple
thermowells may be on one or both faces as
specified
by the purchaser. Groth
temperature sensors may also be installed
as specified.
If the purchaser installs an integrated
temperature sensor, it must be an ATEX
approved devise, installed in the Groth
thermowell such that the sensor contacts the
bottom of the thermowell.
DESIGN AND FUNCTION
Groth's in line deflagration flame arresters are
designed to prevent flame propagation in gas
piping
systems that contain flammable
gas/vapor mixtures. The arrester must prevent
flame
passage under certain specified
conditions while permitting free flow of
gas/vapor through the system. Thus it protects
vulnerable equipment or components of the
system from damage due to explosive pressures
caused by gas/vapor ignition in another part of
the system. The deflagration flame arrester
must be used under only those operating
conditions for which it was designed and tested.
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 ensure the best flame
quenching performance with minimum pressure
drop. The element is supported by rigid beams,
securely welded into the housing to withstand
the pressures of an in line deflagration.
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.
See “INTEGRATED TEMPERATURE SENSORS”
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.
INSTALLATION
Operating Conditions:
Based on the testing conditions, this series of
In line deflagration flame arrester may be
installed in piping systems where:
1. The MESG of the vapor constituent(s) is
greater than or equal to 0.045" (1.14 mm).
2. System operating pressure is less than or
equal to 15.7 PSIA (1.08 Bar).
3. Normal operating temperature is between
-4
o
F (-20
o
C) and 140
o
F (60
o
C).
4. The piping system in which the deflagration
arrester is to be installed must not exceed
the arrester flange size.
Maximum Allowable Burn Time
*Temperature
Sensor
Emergency
Function
Connection Size Burn Time Trigger Time
2”-12”
(50-300mm)
5 Minutes 2.5 Minutes