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Detonation
Housing
Flame
Size
Arrestor
DFA =
72 = 72 in.
Concentric
Figure 3. DFA Series Detonation Flame Arrestor Available Constructions and Model Numbering System
it is required that a temperature alarm and
shutdown system must be installed.
If the temperature sensor(s) indicate a
temperature excursion beyond anticipated
normal operating temperature, shutdown
should be initiated and review of the process
should be commenced, as necessary.
Maximum initial operating pressure is the pressure of the
system at or near static flow conditions. High pressure
deflagration and detonations can occur more easily at
higher system operating pressures than at pressures near
atmospheric. Elevated pressures condense the ignitable gas
giving the flame more matter and energy to release thereby
boosting the flame heat intensity.
Unstable (over driven) detonations exist during a deflagration
to detonation transition (DDT) before a stable detonation is
reached. This is the most severe condition where pressures
and velocities are at maximum values. Detonation arrestors
rated for unstable detonations may be placed at any location
in a piping system, provided that installation is in accordance
with all sections of this manual.
Figure 2. Cut-away view of DFA Series Detonation Flame Arrestor
/
-
Connection
IEC
Size
Gas
Group
36 = 36 in.
IIA (D)
C = Carbon steel
4 = 304 SST
6 = 316 SST
Housing
Element
Material
Material
4 = 304 SST
F = Flat face
6 = 316 SST
R = Raised face
Pipe Length
Extended lengths of pipe allow the flame to advance into more
severe states of flame propagation such as high-pressure
deflagration and detonations. Although the Enardo detonation
flame arrestor is not limited by pipe length, using a minimum
length is a preferred design and installation practice.
Bends and/or Flow Obstructions
For maximum safety, avoid bends and flow
obstructions within 10 pipe diameters on the
protected side of the detonation flame arrestor.
Valves or other equipment that can obstruct
the flow due to restricting the piping flow area
(e.g. partially closed valves) shall be reviewed
to ensure that they cannot be in a partially
closed position during normal operation. Flame
transmission can occur due to restrictions on
the downstream side of the flame arrestor.
Model DFA 7236
-
Connection
Options
Type
1 = Drain Plug
flange
2 = Pressure Tap
3 = Temperature Probe Tap
4 = Miscellaneous
flange
5 = Protective coating
6 = Special feature
CAUTION
3
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