T-366
6–14
Figure 6.20 Container Leakage Test Ports
One of the ports is connected to a pressurized air supply and the other is connected to a Magnehelic pressure
gauge. The pressure gauge monitors the container leakage rate.
Prior to performing the leak test:
• Seal the floor drains with plugs
• Ensure the unit condensate drain line is filled with water
• Ensure the air makeup panel is tightly closed
• Insert plug in drain hose. Install container curtain at the rear door
• Seal the door shut
When installing the door curtain (part number 76-50036-01), place the curtain around the door and seal the curtain
along the top and sides of the box and close the door. The curtain should be visible throughout the perimeter of the
doors. Tape may be used to assist in holding the curtain in position. Always use a new curtain as a small rip in the cur-
tain can result in a failure of the test.
After connecting the gauges, turn on the air supply and regulate the air pressure to 40-60 psi. When the Magnehelic
gauge reads 2.5 inches of water gauge, shut off the air supply.
Do not exceed 3.0 inches of WG
.
Monitor the Magnehelic pressure gauge for the drop in air pressure in the container. When the Magnehelic pressure
gauge reads 2 inches, start a timer. When the Magnehelic pressure gauge reads 1 inch of WG, stop timing. The
amount of time expired should be no less than eight minutes or more for a 40 foot container and four minutes or more
for a 20 foot container. If it is less than the required time (i.e six minutes), then the container needs to be checked for
leaks.
Figure 6.21 Magnehelic Gauge
Port Location
(Not available on all Units)
* If ports are not available on Unit
then replace Manual Fresh Air
panel disc with a disc that has
pressure decay ports.
(PN: 79-04098-00)
Start Timer*
Shut Off Air Supply
Check Container
for Leaks
* 40’ Container - at least 8 minutes
20’ Container - at least 4 minutes
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