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Single Compartment Test Procedure:
The test of single-compartment tanks is easier to accomplish if there is a quick-connect hose
coupling between the compartment valve and the pump that supplies product to the meter. If the
system does not have quick-connect couplings between the compartment and the meter, an
additional source of sufficient product at the test site is required.
Without a quick-connect coupling:
1) Begin the test with the tank containing an amount of fuel equal to or less than one-half the
nominal capacity of the prover being used. Operate the meter at the normal full flow rate and
note when the tank is empty. There are several methods for determining that the tank is empty.
There may be significant change in the sound of the pump. There may be visual evidence that
the tank has run dry. The meter register may stop entirely or may begin to register sporadically
(pause, resume running, pause, run again, etc.)
2) If the meter stops for 10 seconds or more, proceed to step 3. If the meter indication fails to
stop entirely for a period of 10 seconds, continue to operate the system for 3 minutes.
3) Close the tank valve, and if top filling, close the nozzle or valve at the end of the delivery
hose. Stop the pump and load sufficient product from the alternate source into the supply tank.
Allow the product to stand in the compartment for a brief time to allow entrained vapor or air to
escape. Carefully open the valve at the end of the delivery hose to avoid product splashing out
of the prover due to pockets of vapor or air. The test results may be invalid if product is splashed
out of prover.
4) Continue the delivery of product at the normal full flow rate until the liquid level in the power
reaches the nominal capacity of the prover.
5) Close the delivery nozzle or valve. Stop the meter. Allow any foam to settle, then read the
prover sight gauge as quickly as is practical.
6) Compare the meter indication with the actual delivered volume in the prover.
7. Calculate the meter error, apply Product Depletion test tolerance, and determine whether or
not the meter error is acceptable. For NIST Handbook 44 applications, the Special Test
tolerance is applied.