Portland Natural Gas Transmission System

Second Revised Volume No. 1

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Effective Date: 09/01/2006, Docket: RP06-449-000, Status: Effective

Original Sheet No. 320 Original Sheet No. 320 : Effective

 

GENERAL TERMS AND CONDITIONS (Continued)

 

6. MEASUREMENT OF GAS AND MEASUREMENT EQUIPMENT

 

6.1 The volume and the Total Heating Value of the Gas made available

to Transporter at the Receipt Point(s) and made available to or on behalf of

Shipper at the Delivery Point(s) shall be determined as follows:

 

(a) Unit of Measurement. The unit of Gas, for the purpose of

measurement, shall be one (1) Mcf.

 

(b) Heating Value per Cubic Foot. The Total Heating Value of the

Gas per Cubic Foot shall be determined for any Month by taking the weighted

average of the heating values as recorded each Day by an on-line gas

chromatograph or as determined by chromatographic analysis of a sample of Gas

collected Daily during the Month, or any other method mutually agreed upon by

Shipper and Transporter.

 

(c) Determination of DTH Delivered. The DTH delivered shall be

determined by multiplying the Mcf delivered by the ratio of the BTU per Cubic

Foot delivered to 1,000. For purposes of this determination, the specific

gravity (relative density) and heating value shall be determined at the same

time, as described in Section 6.1(b) herein.

 

(d) Determination of Temperature. The temperature of the Gas

passing through each meter shall be determined for any Day by the continuous

use of a recording thermometer so installed that it may properly record the

temperature of the Gas flowing through each meter. The arithmetical average

of the temperature recorded each Day shall be used in computing Gas

quantities. Where electronic gas measurement is used, live flowing

temperature values shall be used.

 

(e) Specific Gravity. The specific gravity of the Gas shall be

determined by the use of a recording gravitometer, which shall be checked by

Transporter at least once each Month, or any other method mutually agreed upon

by Shipper and Transporter.

 

(f) Deviation from Boyle's Law. The deviation of the Gas from

Boyle's Law shall be determined by the use of the table of formulas published

by the American Gas Association Par Research Project NX-19 corrected for

carbon dioxide and nitrogen, or any superseding applicable tables or

calculation methods published by the American Gas Association. Determinations

of the molecular percentage of N2 and CO2 in the Gas shall be made within

thirty (30) Days after