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EMPTY FUEL CELL
(ALL
OPENINGS
PLUGGED)
OPTIONAL
OVERFLOW
COLLECTOR
PLASTIC
AMMONIA
GAS
STD.
RULER
SHOP AIR
TUBING
(NH3
OR
YARDSTICK
LEAK PROOF
STOPPERS
MOISTURE
COLLECTOR
T
REGULATOR
6"
SET
TO
¼ PSI
GLASS
TUBES
6
AMMONIUM
HYDROX1DE GLASS FLASK
(NH4OH)
OR
MANOMETER
SOLUTION
BOTTLE
6"
of
WATER
=
½ PSI
33-281-30
Figure 5-15.
Setup
For Leak Test
3.
Apply
a
soap and water solution
to
all repaired
b.
Rubber
stoppers
to plug the
fitting
openings
areas
and
any areas
suspected
of leakage.
Bubbles
will
in
the
fuel
cell.
One
of the stoppers
should have a hole
for
appear at any point where
leakage occurs.
insertion
of the plastic tubing used to connect
the
fuel
cell
into
the test setup.
4.
After
test,
remove
all plates
and wipe soap
residue
from the
exterior
of
the
cell.
c.
A manometer
for
measuring
6
inches
of
water
differential. The
manometer
can
be
fabricated
from
b. Chemical Test
glass
or
clear plastic
tubing,
frame
and scale similar to the
illustration shown.
Rubber bladder type fuel
cells
may be bench tested for
leakage by
sealing off all openings
and
inflating the
empty
d.
A
regulator
that can
be
set to provide
U4 psi
cell to 1/4 psi with a mixture of shop air and ammonia
gas,
(6 inches of
water)
from a supply of shop air.
then checking
for
visible
indications
of
leakage
on a cloth
saturated
with
phenolphthalein
solution.
To
set up and
e.
Two
flasks
(or
bottles)
approximately
one
conduct
the leakage test,
proceed
as
follows:
liter (or
quart)
in
capacity.
A third container
may
be
hooked
into
the
test setup to provide an
optional
overflow
collector
1.
The
following
equipment
is
required
and
should
if desired.
The two
containers
should
be
provided
with
be
booked up as
indicated in
the schematic
in Figure 5-15:
rubber stoppers
that
have holes for
the insertion
of 1/4-inch
tubes
(glass
or metal) as shown
in
the schematic
in
Figure
a.
Closure
plates
for the fuel
cell
openings.
5-15.
Such
plates may
be fabricated of
aluminum
sheet
cut to a
size sufficient
to cover the cell openings. Drill holes in
the
f.
Plastic tubing
of a
size
to
provide a
leak-free
closure
plate to match the hole pattern
around
the opening in
fit
over the tubes
and of a length
sufficient
to
interconnect
the
fuel
cell.
C3
5-21
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