These lugs are not intended for lifting
the entire unit during installation.
Damage to the detonation flame arrestor
may result from improper lifting. The
unit should be lifted using appropriately
rated Nylon (PA) straps rigged on the
outside of the tension studs.
The arrestor should be positioned such that the entire
arrestor is accessible for removal. Models that have
drain plugs are designed for horizontal installation
and should be installed with the drain plugs aligned
at the bottom of the unit. Models that have pressure
taps are designed to allow pressure gauges to be
installed on both sides of the flame cell assembly
to determine blockage. The pressure taps should
be aligned at the top to allow easy viewing of the
gauges. Units that are equipped with optional internal
cleaning systems should be connected to a source of
cleaning media such as water, steam or other suitable
solvent. Observe recommended installation practice as
previously described.
Piping Expansions and Reductions
Adjacent to Detonation Flame Arrestor
▲
WARNING
No instrument, tubing or other device
whatsoever shall circumvent the
detonation flame arrestor in such a
manner to allow a flame path to exist
around the flame element of the arrestor.
When instrumentation is installed in
such a manner that it creates a path
circumventing the flame element of an
arrestor, measures must be taken to
prevent passage of flame through the
instrumentation device and/or system.
Instrumentation must be capable of
withstanding the maximum and minimum
pressures and temperatures to which the
device may be exposed and at a minimum
be capable of withstanding a hydrostatic
pressure test of 350 psig / 24 bar.
For an in-line flame arrestor, the pipe diameter on
the protected (“cold”) side shall be no less than the
pipe diameter on the unprotected (“hot”) side. For
an in-line flame arrestor, the pipe diameter on the
unprotected (“hot) side shall be no greater than the
flame arrestor connection.
When it is necessary to
increase the diameter of the piping on the downstream
side (unprotected) of the detonation flame arrestor,
10
EN-DFA Series
North America
Only
a length of pipe at least 120 pipe diameters must be
installed between the detonation flame arrestor and
the expansion. A pipe diameter is considered as the
inside diameter of pipe having a nominal size equal to
the detonation flame arrestor’s connecting flanges.
Maintenance
▲
WARNING
Isolate gas supply and bring system
to atmospheric pressure to prevent
ignitable gas from flashing while
performing maintenance.
△
CAUTION
The flame cells in the arrestor’s element
assembly are not retained once the
element assembly has been removed
from the arrestor. They can slide
out of the housing during handling.
It is recommended that the element
assembly only be removed after the
entire arrestor has been removed from
the piping system.
Element Disassembly
1.
Loosen all nuts on tension studs between conical
sections of the detonation flame arrestor.
△
CAUTION
Element assemblies are heavy and will
require the use of adequate equipment
and manpower to prevent injury.
2.
Carefully force the two conical sections apart
while the nuts are still on the tension studs.
When the two flange faces have separated,
remove enough of the tension studs such that
the element assembly can be removed. Not all
studs are required to be removed to be able to
rotate the element assembly out of the housings.
It is possible for the elements to come out of the
housing once the end sections have been removed.
Inspecting and Cleaning the Flame Cells
1.
Inspect flame cells for damage immediately
following a deflagration, detonation and/or
stabilized burn.
