Section 15-2356. PREINSTALLATION TESTS OF ROTARY METERS

2356.1Rotary meters on which an original test record of the differential pressures is established, as soon as practicable after installation, may subsequently be tested by comparing the new differential pressures with the original test record. This subsequent test may be in place of normal testing with a bell prover or other approved working standard.

2356.2In establishing the original test record, the pressure differential shall be recorded at two (2) or more load levels, with the minimum being no less than twenty percent (20%) of the rated capacity at the operating pressure of the meter.

2356.3The meters shall be given a differential pressure test at least once every twenty-four (24) months unless covered under an approved in-service performance testing program.

2356.4When the test differential pressure differs from the original test record by more than fifty percent (50%), the meter shall not be used for measurement for revenue billing purposes until, by cleaning or repairing, the differential pressure is not more than fifty percent (50%) in excess of the original test record.

2356.5If the differential pressure cannot be brought within the above limits by cleaning or repairing, the meter shall be removed from service and replaced with an accurate meter.

2356.6The differential pressure test shall not be used as a periodic test on rotary meters having a rated capacity of less than eight hundred (800) cubic foot per hour (cfh), or on rotary meters on which the results of a differential pressure test would not be conclusive, such as meters connected to the following:

(a)Loads which are less than twenty percent (20%) for the rated capacity of the meters; or

(b)Rapidly fluctuating loads.

 

authority

Unless otherwise noted, the authority for this chapter is Paragraph 21 of §8 of An Act Making appropriations to provide for the expenses of the District of Columbia for the fiscal year ending June thirtieth, nineteen hundred and fourteen, and for other purposes, approved March 4, 1913 (37 Stat. 977); as amended by §2 of the Public Utilities Amendment Act of 1989, D.C. Law 8-47, D.C. Code §43-501 (1990 Repl. Vol.).

source

Final Rulemaking published at 35 DCR 7938, 7942 (November 4, 1988); as amended by Final Rulemaking published at 60 DCR 7 (January 4, 2013).