Emerson Process Management GmbH & Co. OHG
4-5
4
Maintenance
X-STREAM XEFD
Instruction Manual
HASXEDE-IM-EX
07/2017
4.1.1.3 Tests on Flame Arrestors
The following procedure describes how to
perform a leak test with the flame arrestor
installed at the instrument.
Required tools
•
U-turn manometer for max. 1.45 psi
(100 mbar) or digital manometer
•
Stop valve
Procedure
•
Connect the water filled u-turn manome
-
ter or digital manometer to the analyzer’s
sample gas output (disconnect external
gas lines).
Maintenance is limited to performing visual in-
spections, leak testing and pressure drop tests
on at least a regular basis. The time interval has
to be operator defined, considering operating
conditions and composition of supplied gases.
The flame arrestor is completely welded, no inner
parts are user accessible. Therefore the flame
arrestor has to be replaced by a new one, if
- a fire occurred on the flame arrestor element
- the housing or the fittings show visible
mechanical damages
- contamination of inner elements is
detected (e.g. by pressure drop test)
-
the flame arrestor did not pass leak testing
4.1.1.3.1 Leak Testing
•
Install the stop valve between gas input
fitting and a nitrogen (N
2
) supply.
•
Open the stop valve until the internal
gas path is under pressure of approx.
0.725 psi/50 mbar (corresponding to
19.7 inch/500 mm water column)
•
Close the stop valve. After a short time
for the water to balance, the water level
must not change over a time period of
approx. 5 minutes!
For leak testing the containment system (gas
path) of an analyzer handling flammable sam
-
ple gas the gas path has to be pressurized
with 500 mbarg (7.25 psig). After stabilization
time of 10 min, the pressure in the gas path
must not change > 1 mbarg over a period
of 30 min. Test has to be carried out with a
temperate stable analyzer and ambient tem
-
perature should not change by more than 2 K.
When using a water filled u-tube
manometer prevent water from
entering backwards into the
flame arrestor!
Don’t exceed the maximum
pressure applicable to the ana-
lyzer as specified in it’s instruc
-
tion manual!
EXPLOSION HAZARD AND GASES HAZARDOUS TO HEALTH
Maintaining the flame arrestor must be carried out considering all applicable
safety and legislative rules. Maintenance should be carried out by instructed
and trained personnel only!
Before opening gas paths they must be purged with safe air or neutral gas
(N
2
) to avoid hazards caused by toxic, flammable, explosive or harmful to
health sample gas components!
4.1 Verifications and Tests
