NTSB Safety Recommendation P-75-002

NTSB safety recommendation P-75-002.

REQUIRE THE MICHIGAN-WISCONSIN PIPE LINE COMPANY TO: RECALIBRATE THE PRESSURE-DROP SETTINGS ON THEIR EXISTING AUTOMATIC VALVES TO BETTER INSURE THEIR ACTUATION ON PRESSURE DROPS CAUSED BY LINE FAILURE, AS REQUIRED UNDER 49 CFR 192.745, VALVE MAINTENANCE: TRANSMISSION LINES.

Priority: CLASS II

Overall Status: Closed - Reconsidered

Issued Date: 1975-04-02

Adopted Date: 1975-04-02

Overall Date Closed: 1979-02-02

Synopsis: ON MARCH 2, 1974, A NATURAL GAS PIPELINE ACCIDENT OCCURRED NEAR MONROE, LOUISIANA. 30-INCH PIPELINE FAILED AT A GIRTH WELD INSIDE A CASING UNDER A HIGHWAY. A RESULTING FIRE BURNED 10 ACRES OF FOREST, BUT NO DEATHS OR INJURIES RESULTED.

Ntsbnumber: PLD74XR004

Report Number: PAR-75-01

Addressee Name: RSPA

Addressee Status: Closed - Reconsidered

Addressee Date Closed: 1979-02-02

Addressee Acronym: RSPA

Addressee Organization Type: G-Federal Government

Communication Date: 1975-09-03

Communication Type: Official Correspondence

Communication Contents: 49 CFR 192.745 REQUIRES VALVES THAT MIGHT BE REQUIRED DURING AN EMERGENCY TO BE INSPECTED AND PARTIALLY OPERATED AT INTERVALS NOT TO EXCEED 1 YEAR. THE VALVE THAT FAILED AUTOMATICALLY DID PERFORM MANUALLY. THE REGULATION APPLIES TO THE ABILITY OF THE VALVE TO CONTROL GAS FLOW AND IS NOT RELATED TO THE MANNER IN WHICH IT IS OPERATED. PART 192 DOES NOT REQUIRE AUTOMATIC VALVE OPERATION.