1.
If relief devices piping is manifolded, the cross-sectional area of the relief pipe must at least
equal the sum of the areas required for individual relief pipes.
2.
Provide a pipe plug near outlet side of each relief device for leak testing. Provide pipe
fittings that allow vent piping to be disconnected periodically for inspection of valve
mechanism.
3.
Piping to relief devices must not apply stress to the device. Adequately support piping. A
length of flexible tubing or piping near the device is essential on spring-isolated machines.
4.
Cover the outdoor vent with a rain cap and place a condensation drain at the low point in
the vent piping to prevent water build-up on the atmospheric side of the relief device.
Refrigerant discharged into confined spaces can displace oxygen and cause
asphyxiation.
DANGER
!
DANGER
Click here for Table 2 — Relief Device Locations
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