16
PLLD 3.0 gph Test Protocol
1.
The 3.0 gph line leak test is performed immediately after the
last dispense cycle has been completed.
2.
The STP remains running for approximately 10 seconds to
pressurize the line.
3.
The STP is then switched Off.
4.
Wait a certain number of seconds to allow the line to vent
down to the check valve’s relief pressure. The time varies
with line length and line type.
5.
Take the first pump-off pressure reading (P
1
). If P
1
is less
than 12 psi, a GROSS TEST FAIL alarm is posted and the
test is complete.
6.
Wait a pre-determined amount of time (varies with line
length and type - from 5 seconds to several minutes) to
allow the line to lose pressure if a leak exists.
7.
Take the second pump-off pressure reading P
2
.
8.
Compare the drop from P
1
to P
2
, if it exceeds the 3 gph
threshold, the test is repeated. If it fails again, a GROSS
TEST FAIL alarm is posted and the test is complete.
APPENDIX B - THEORY OF OPERATION
