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12
FINAL TESTING PROCEDURE
WARNING:
Compressed air can be highly explosive
and is dangerous if misused. Ensure the cylinder
valve is opened slowly. Use eye and ear personal
protective equipment when performing any tests
involving compressed air.
First Stage Testing
1. Cycle the handwheel (21) several times to ensure the
proper function of the indicator ring (23) and seat & disc
retainer (31). Close the handwheel when finished.
2. Install the QD adapter and test gauge onto the end of
the MP hose (13). Leave the bleed valve on the test gauge
slightly open.
3. Attach the SCUBA fill adapter to the fill port and slowly fill
the DSIS / LPIS to 3000 PSI (207 BAR). Do not exceed a fill
rate of 500 PSI (34 BAR) per minute. Secure the MP hose
(13) and test gauge during the fill process.
4. During the fill process, check for any air leaking from
the bleed valve on the test gauge. If an air leak is detected,
immediately stop the filling process and refer to Table 1:
Troubleshooting Guide section of this manual to determine
its possible cause. If no leak is detected, finish filling the
cylinder (39) and remove the SCUBA fill adapter from the
fill port (36).
5. Ensure the bleed valve on the test gauge is slightly open
and slowly open the handwheel (21). While watching the test
gauge, slowly close the bleed valve.
NOTE: Correct medium pressure for the LPIS / DSIS is
135 ±20 PSI (9.3 ± 1.4 BAR), with an inlet pressure of
3000 PSI (207 BAR).
•
If a stable MP has been achieved, note the pressure
indicated on the test gauge. Cycle the bleed valve
several times and closely monitor the test gauge for
several minutes, making sure the MP has remained
stable.
•
If the MP exceeds 155 PSI (10.7 BAR), quickly open the
bleed valve and close the handwheel (21). Refer to Table
1 : Troubleshooting Guide section of this manual to
determine its possible cause.
•
If the MP rises more than 5 PSI (0.35 BAR) in 5-15
seconds after cycling the bleed valve or "creeps",
this indicates a HP leak. Refer to Table 1 : Trouble-
shooting Guide section of this manual to determine
its possible cause.
6. Close the handwheel and open the bleed valve on the test
gauge to depressurize the system. Remove the test gauge
and QD adapter from the MP hose (13).
Immersion Test
1. Slowly open the handwheel and check the pressure gauge
(38) reads 3000 PSI (207 BAR) indicating a full cylinder (39).
2. Submerge the entire system in a test tank of clean water.
Shake the unit to remove trapped bubbles. Observe any bub-
bles rising from the submerged system over a five minute
period. The recommended time is necessary due to slower
bubble formation that occurs in smaller leaks. Bubbles indi-
cate a leak, which requires the system to be disassembled
at the source to check sealing surfaces, assembly sequence
and component positioning in order to correct the problem.
NOTE: Do not confuse bubbles from trapped air with a
true leak. If there is an air leak, bubbles will come out in
a constant stream.
Pressure Drop Test
1. Ensure the unit pressurized with the handwheel (21) in
the open position. Check the pressure gauge (38) reads
3000 PSI (207 BAR) indicating a full cylinder. Set the unit
in a stable temperature for a minimum of twelve hours.
After the time has elapsed, check the pressure gauge
reads 3000 PSI (207 BAR).
WARNING:
If the pressure gauge (38) does not read
3000 PSI (207 BAR) after 12 hours, refer to Table 1:
Troubleshooting Guide section of this manual to
determine its possible cause.
2. Upon completion of the pressure drop test, ensure all
water is removed from unit. Blow clean LP air through the
cap (2) holes and fill port (36) to remove excess water.
After the unit is dry, refill the unit to 3000 PSI (207 BAR).
Close the handwheel (21) when filling is complete and
depressurize the unit.
3. Once completely dry, install retainer cover (1) and fill
port cap (34).
4. Providing the unit has passed all testing and the cylinder
has been filled to 3000 PSI (207 BAR), the LPIS/DSIS is
ready for use.
LPIS / DSIS Technical Manual
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