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PDFWAC 480-75-320

Overpressure protection.

A pipeline company must conduct a surge analysis to ensure that the surge pressure does not exceed one hundred ten percent of the MOP. The pipeline company must design and operate the pressure relief system consistent with the surge analysis, at or below the MOP except under surge conditions.
[Statutory Authority: RCW 80.01.040, 80.04.060, 81.88.040. WSR 08-12-045 (Docket PL-070974, General Order R-548), § 480-75-320, filed 5/30/08, effective 6/30/08. Statutory Authority: RCW 80.01.040 and 80.04.160. WSR 02-18-032 (Docket No. TO-000712, General Order No. R-500), § 480-75-320, filed 8/26/02, effective 9/26/02.]
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