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Part No. 920559 Rev H November 2008
2.11 Wayne Vac Vapor Recovery System Installation Requirements
2.11.1 Dispenser Vacuum Decay
At initial installation, Wayne Vac vapor recovery dispensers should have a 27” decay test performed on
each point to ensure there are no vapor leaks in the dispenser/hanging hardware - hose, nozzle, break-
away, etc. This test is used to verify the dispenser/hanging hardware integrity so the vapor assist system
will operate at its peak performance.
The test should be performed with the proper hanging hardware installed on the dispenser and the dis-
penser disconnected from the underground piping.
Connect the test equipment to the discharge of the vapor piping in the dispenser and apply 27” of water
vacuum to the vapor line. Then close off the vapor line and determine if the closed vapor system can
maintain the 27” of water vacuum.
The system should hold the vacuum for one minute. If it does not, apply 10” of water pressure to the sys-
tem, soaping all connections to find the leak. Use a light soap solution; a heavy soap solution could mask
leaks. If the system piping is tight, check hanging hardware by bagging the nozzles and doing a vacuum
test again, while looking for the bags to deflate. The Wayne vacuum tester, as discussed below, is also
used to test nozzles for leaks.
2.11.2 Wayne Pressure/Vacuum Tester
The Wayne Pressure/Vacuum Tester, part number 1-921168-KIT, is available from Wayne to perform this
test. The Operation manual, part number 920372 included in the kit, explains the various tests that can
performed using both vacuum and pressure.
Additional information on these tests is contained in the Compliance Testing and Preventative Mainte-
nance manual, part number 917947, supplied with each Wayne Vac equipped dispenser.
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