Northwest Pipeline Corporation

First Revised Volume No. 1-A

Effective Date: 06/02/1991, Docket: RP91-150-001, Status: Effective

Substitute First Revised Sheet No. 415 Substitute First Revised Sheet No. 415 : Effective

Superseding: Original Sheet No. 415

GENERAL TRANSPORTATION TERMS AND CONDITIONS

(Continued)

12. PRIORITY OF SERVICE

12.1 Firm Service. Firm service shall be those services for which a

demand charge, facility charge or capacity reservation charge are

applicable including firm service as provided in Section 13.1 of

Transporter's Volume No. 1 Tariff and firm transportation under

Transporter's Volume No. 1, 1-A or 2 Tariffs.

12.2 Interruptible Service. Interruptible service shall be any service

that is not firm as defined in Section 12.1 including interruptible

service as provided in Section 13.2 of Transporter's Volume No. 1,

interruptible transportation under Transporter's Volume No. 1-A or 2 or

interruptible sales or interruptible transportation pursuant to contracts

not included in the tariff.

Any interruptible transportation service in which the term of the

agreement is for a period(s) which occurs at one or more non-sequential

times during a calendar year, each of which periods is deemed a "season",

shall be referred to as "seasonal interruptible".

12.3 Priority Date. For purposes of this Section 12, the term

"Transportation Agreement" shall mean an executed Transportation Agreement

and/or any executed Amendments to that Transportation Agreement. A

request for an amendment to a transportation agreement is generally a new

request for priority purposes to the extent that it adds a receipt and/or

delivery point, increases volume, or converts interruptible transportation

to firm transportation. Only that portion of the service which is new

will receive a new priority date. However, existing agreements may be

amended, without the amendment constituting a new agreement for priority

purposes, consistent with the flexible receipt point provisions of Rate

Schedules TF-1, Section 15, and TI-1, Section 11, of this FERC Gas Tariff,

Volume No. 1-A.

(a) For purposes of this Section 12, "Priority Date" shall mean as

provided in (1), (2) or (3) below:

(1) For agreements executed prior to June 10, 1988, which contain

specific priority of service provisions, Transporter shall

establish a Priority Date which serves to maintain the existing

priority relationships.

(2) For agreements executed prior to June 10, 1988, which do not

contain specific priority of service provisions, Priority Date

shall be the date of execution of such agreements.