# GREYLOCK MIDSTREAM, LLC — Gas transmission and gathering — incident on 2018-08-29

- **operation:** document
- **citation:** PHMSA Report 20180095
- **title:** GREYLOCK MIDSTREAM, LLC — Gas transmission and gathering — incident on 2018-08-29
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2018-09-25
- **effective on:** 2018-08-29
- **summary:** Gas transmission and gathering incident in WAYNESBURG, GREENE County, PA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3646 NATURAL GAS released, $0 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: not significant, not serious.
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**body:**

Gas transmission and gathering incident in WAYNESBURG, GREENE County, PA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3646 NATURAL GAS released, $0 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: 20180095.

Operator ID: 39750.

Reported incident date: 8/29/2018 10:00.

Location detail: MS 642822

Cause detail: OTHER EQUIPMENT FAILURE

Cause detail: AT AROUND 10AM ON 8/29/2018 GREYLOCK EMPLOYEES ARRIVED ONSITE AND FOUND THAT GAS WAS VENTING TO THE FLUID TANK FROM THE FILTER SEPARATOR. UPON INVESTIGATION ONE OF THE DUMP VALVES ON THE FILTER SEPARATOR WAS FOUND TO BE STUCK IN THE OPEN POSITION. A MANUAL VALVE WAS SHUT TO STOP TO THE FLOW OF GAS TO THE TANK AND TO ISOLATE THE DUMP VALVE. THE DUMP VALVE ADJUSTMENT SCREW WAS ADJUSTED AND THE VALVE STARTED OPENING AND CLOSING PROPERLY. A VENT LINE UPSTREAM OF THE DUMP VALVES WAS OPENED TO TRY AND BLOW AND DEBRIS OUT OF THE LINE THAT MAY HAS CAUSED TO DUMP VALVE TO GET STUCK IN THE OPEN POSITION. THE VALVE WAS THEN TURNED BACK INLINE. AT THE TIME OF THE INCIDENT GREYLOCK WAS UNAWARE OF HOW MUCH GAS VENTED OR FOR HOW LONG IT HAD BEEN VENTING AND COULD NOT CONFIRM AN INCIDENT HAD OCCURRED UNTIL FURTHER INVESTIGATION. ON 8/30/2018 AT AROUND 3:50PM FACILITIES RECEIVED AN EMAIL FROM THE MARKETING GROUP SHOWING THAT GREYLOCK HAD VENTED APPROXIMATELY 3646 MSCF OF GAS CONFIRMING AN INCIDENT HAD OCCURRED. AT THAT TIME A TELEPHONIC NOTICE WAS MADE TO PHMSA AT APPROXIMATELY 4:15PM. IN ORDER TO PREVENT REOCCURRENCE GREYLOCK OPENED UP THE FILTER SEPARATOR AND CLEANED THE FILTER OF BLACK/DARK GREY SEDIMENT THAT HAD COLLECTED IN THE FILTER SEPARATOR. GREYLOCK ALSO REPLACED THE OLD FILTERS AND INSTALLED NEW CLEAN FILTERS AND BLEW OUT DUMP LINES. GREYLOCK HAS ALSO SCHEDULED A TRAINING WITH THE MANUFACTURER AND IS WORKING ON A MAINTENANCE PROCEDURE FOR THE FILTER SEPARATORS.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — OTHER EQUIPMENT FAILURE.

PHMSA indexed costs: $6,672 reported total cost, $6,230.355 in 1984 dollars, $7,649.929 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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