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Split Compartment Test (Continued)
With a quick-connect coupling:
1)
During a normal full flow test run, close the compartment valve when the prover is approximately
one-half full to its normal capacity. Then slowly and carefully disconnect the quick-connect
coupling, allowing the pump to drain the supply line.
2)
Continue the test until the meter indication stops entirely for at least 10 seconds. If the meter fails
to stop entirely for at least 10 seconds, continue to operate the system for 3 minutes.
3)
After 10 seconds (or 3 minutes if the meter indication did not stop entirely), close the delivery
nozzle or valve at the end of the delivery hose if top filling.
4)
Disconnect and reconnect the quick-connect coupling and open the compartment valve.
5)
Carefully open the nozzle or valve at the end of the delivery hose. Pockets of vapor or air may
cause product to splash out of the prover. The test results may not be valid if product is splashed
out of the prover. Appropriate attire and protection is required, and always use caution.
6)
Continue the delivery of product at the normal full flow rate until the liquid level in the prover
reaches the prover's nominal capacity.
7)
Close the delivery nozzle or valve. Stop the pump. Allow any entrained air to settle, then read the
prover sight gauge.
8)
Compare the meter indication with the actual delivered volume in the prover.
9) Calculate the meter error. Apply the Product Depletion Test Tolerance to determine whether the
meter error is within acceptable limits. Refer to NIST Handbook 44 for further information.
Product Depletion Test Tolerance for Vehicle-Tank Meters:
Marked Maximum Flow Rate
Less than 100 GPM (380 LPM)
100 GPM (380 LPM) or greater
The results of the product depletion test may fall outside of the applicable test tolerance as this is a
stand-alone test.
The test draft should be equal to at least the amount delivered by the device in 1 minute at its
maximum discharge rate, and in no case should it be less than 50 gallons.
Page 18
Product Depletion Test Tolerance
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0.5%
0.6%
TCS900003, Rev.6
04/26/2016
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Troubleshooting
