# TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2018-04-06

- **operation:** document
- **citation:** PHMSA Report 20180053
- **title:** TRANSCONTINENTAL GAS PIPE LINE COMPANY — Gas transmission and gathering — incident on 2018-04-06
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2018-05-15
- **effective on:** 2018-04-06
- **summary:** Gas transmission and gathering incident in JERSEY SHORE, LYCOMING County, PA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 1000 NATURAL GAS released, $400,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings. PHMSA trend classification: significant incident, not serious.
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**body:**

Gas transmission and gathering incident in JERSEY SHORE, LYCOMING County, PA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 1000 NATURAL GAS released, $400,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20180053.

Operator ID: 19570.

Reported incident date: 4/6/2018 16:00.

Location detail: 157.63

Cause detail: THREADED CONNECTION/COUPLING FAILURE

Cause detail: FOUND GAS LEAKING FROM STATION YARD BY PICKING UP ON GAS MONITORS. PROBED HOLES AROUND THE AREA TO PINPOINT THE LEAK. FOUND STRONGER LEVELS OF GAS AND HAND DUG TO EXPOSE SOME PIPING AND VALVE WHERE THEN AN ICE BALL WAS FOUND WHERE THE LEAK WAS COMING FROM. PERFORMED ISOLATION AND BLOWDOWN OF THE STATION TO MAKE IT SAFE AND SCHEDULED CONTRACTOR TO COME IN TO BEGIN HYDROVAC AREA TO FIND THE LEAK. PERFORMED BLOWDOWN OF LEIDY A LINE FROM MLV 520LA1 TO 520LA10 TO REMOVE PRESSURE IN THE LINE TO INVESTIGATE LEAK AROUND 520S2 VALVE AND 24-INCH STATION HEADER PIPING. TIME LINE BELOW; 4/6/2018 16:30 IDENTIFIED A SMALL GAS LEAK NEAR VALVE 520S2. HAND-EXCAVATED GROUND AND IDENTIFIED ICE NEAR THE VALVE SITE AND LEAK INDICATIONS TOWARD LEIDY LINE A. OPERATIONS DECIDED TO BLOW-DOWN THE STATION YARD PIPING. BEGAN TO ASSEMBLE PERSONNEL AND EQUIPMENT. 18:00 TO 20:00 BLOWDOWN STATION YARD PIPING. STARTED LEAK INVESTIGATION. 4/11/2018 10:00 COMPLETED BLOWDOWN OF 2.5 MILES OF 24" LEIDY LINE. GAS VOLUME WAS DRAWN BY METER STATIONS AND BLOWDOWN AT LOWER PRESSURE. CONTINUE LEAK INVESTIGATION. 4/12/2018 15:00 DECIDED TO REPLACE THE VALVE AND LOCATED SURPLUS VALVE. THE EXISTING 24" BOLTED BODY VALVE WAS LEAKING AT THE BODY FLANGE AND THREADED DRAIN PLUG AT BOTTOM OF THE VALVE. THE EXISTING VALVE WAS INSTALLED IN 1965. OPERATIONS BEGAN TO ASSEMBLE PERSONNEL, MATERIAL, AND EQUIPMENT FOR THE VALVE REPLACEMENT. 4/16/2018 12:11 PIPELINE SAFETY WAS CONTACTED AND WILLIAMS - SECURITY OPERATIONS CENTER (SOC) CONTACTED THE NRC. ORIGINAL INCIDENT REPORT# 1209456. 4/18/2018 NEW 24" VALVE ASSEMBLY WAS TESTED AND PLAN TO INSTALL ON 4/20/2018 4/19/2018 14:01 PIPELINE SAFETY CONTACTED NRC FOR THE FOLLOW-UP. WILLIAMS IS WORKING ON THE VALVE REPLACEMENT. NEW INCIDENT REPORT# 1209745. 4/20/2018 VALVE REPLACED WITH NEW 24" BALL VALVE. EXISTING VALVE HAD BODY BLEED LEAK AND BODY FLANGE LEAK AT CONNECTIONS. CONTINUE TO INVESTIGATE PIPING AND HEADERS FOR CORROSION AND COATINGS WHILE COMPRESSOR STATION IS SHUT DOWN. 5/21/2018 13:30 LEIDY LINE A WAS RETURNED TO SERVICE FROM MLV 520LA0 - 520LA10. STATION 520 IS STILL OUT OF SERVICE, CONTINUE TO INVESTIGATE PIPING AND HEADERS FOR CORROSION AND COATINGS WHILE COMPRESSOR STATION IS SHUT DOWN. 6/22/2018 COMPLETED INVESTIGATION. 19:00 STATION 520 RETURNED TO SERVICE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — THREADED CONNECTION/COUPLING FAILURE.

PHMSA indexed costs: $414,200 reported total cost, $202,055.101 in 1984 dollars, $486,990.963 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.
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