Rules & Regulations of the State of Tennessee
Title 1220 - Tennessee Public Utility Commission
Subtitle 1220-04 - Division of Public Utilities
Chapter 1220-04-05 - Regulations for Gas Companies
Section 1220-04-05-.27 - TEST PROCEDURES AND ACCURACIES

Universal Citation: TN Comp Rules and Regs 1220-04-05-.27

Current through September 24, 2024

(1) Meters and/or associated metering devices shall be tested at the points and adjusted to the tolerances prescribed below. The test of any unit of metering equipment shall consist of a comparison of its accuracy with the accuracy of a standard. The Authority will use the applicable provisions of the standards listed in Rule 1220-4-5 - .22 as criteria of accepted good practice in testing meters.

(a) Positive Displacement Meters
1. Accuracy at test points

Flow Adjusted to within
Check flow.............................. 1.5%
Not less than full rated flow ........................ 1.5%

2. Overall accuracy

The accuracy at check flow and the accuracy at not less than full rated flow shall agree with one (1%) percent.

(b) Orifice Meters

Testing for all orifice meters shall be in accordance with procedures as set forth in the American Gas Association Committee Report No. 3. Accuracy at test points must be within two percent (2%), plus or minus.

(c) Timing Devices

All recording type meters or associated instruments which have a timing element that serves to record the time at which the measurement occurs must be adjusted so that the timing element is not in error by more than plus or minus four (4) minutes in twenty-four (24) hours.

(d) General
1. All meters and/or associated metering devices, when tested, shall be adjusted as closely as practicable to the condition of zero (0) error.

2. All tolerances are to be interpreted as maximum permissible variations from the condition of zero (0) error. In making adjustments no advantage of the prescribed tolerance limits shall be taken

Authority: T.C.A. § 65-2-102.

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