Northwest Pipeline Corporation

First Revised Volume No. 1-A

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Effective Date: 06/02/1991, Docket: RP91-150-000, Status: Effective

First Revised Sheet No. 408 First Revised Sheet No. 408 : Effective

Superseding: Original Sheet No. 408






4.5 Notice of Equipment Tests. (Continued)

reasonably not be satisfied with any such test, it shall so notify the

operating party and the operating party shall perform such retests as

may be necessary to assure an accurate test.


4.6 Meter Testing. The accuracy of measurement equipment shall be

verified at reasonable intervals by the party operating such equipment,

and if requested, in the presence of representatives of the other

party, unless otherwise agreed to by the parties. If either party

notifies the other that it desires a special test of any measurement

equipment, the operating party shall cooperate to secure an immediate

verification of the accuracy of such measurement equipment and joint

observation of any adjustments. The payment for all such tests shall

be borne by the party requesting the test, unless otherwise agreed to

by the parties.


4.7 Check Meters and Non-Interference. Either party may install and

operate check meters at its option and expense to check the other

party's primary measurement equipment, but measurement of gas shall be

by the measurement equipment of the parties identified in Section 4.3.

Such check meters shall be installed so as not to interfere with the

operation of the primary measurement equipment of such parties. The

parties shall exercise care in the installation, maintenance and

operation of check measuring, pressure regulating equipment or gas

compressors so as to prevent any inaccuracy in the determination of the

quantity or quality of gas being measured. If unacceptable square root

error or gauge line error shifts occur, the installation of pulsation

filters may be required by Northwest. The party responsible for the

source of any pulsation shall also be responsible for the installation

cost of remedial devices or filtering equipment to reduce or eliminate

such pulsation. If disagreeements over pulsation arise, a third-party

consultant acceptable to both Transporter and Shipper will be consulted

to resolve the problem.


4.8 Adjustment of Inaccuracies. If the percentage of inaccuracy upon

any test shall be an amount exceeding two percent (2%), the

registration of such meter shall be corrected at the rate of such

inaccuracy for any period which is definitely known or agreed upon. In

the event the period is not definitely known or agreed upon, such

correction shall be for a period extending back one-half (1/2) of the

time elapsed since the date of the last calibration. In no event shall

inaccuracies of less than two (2) percent daily or 100 MMBtus monthly

be corrected. No correction period shall extend back more than one

year from the date of the meter test. Following any test, measurement