{"operation":"document","citation":"P-92-004","title":"NTSB Safety Recommendation P-92-004","source_type":"guidance","agency":"National Transportation Safety Board","status":"guidance","official":true,"published_on":"1992-04-29","effective_on":"1992-04-29","summary":"THE NTSB RECOMMENDS THAT THE OKLAHOMA NATURAL GAS COMPANY: REQUIRE SERVICE REGULATOR TECHNICIANS TO TEST REGULATOR RELIEF VALVES WHEN PERFORMING MAINTENANCE TESTS OR RECONDITIONING REGULATORS TO DETERMINE THAT THESE VALVES OPERATE ACCORDING TO THE MANUFACTURER'S SPECIFICATIONS.","machine_formats":{"json":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-92-004.json","markdown":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-92-004.md"},"app_url":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-92-004","source_url":"https://data.ntsb.gov/carol-main-public/sr-details/P-92-004","body":"NTSB safety recommendation P-92-004.\n\nTHE NTSB RECOMMENDS THAT THE OKLAHOMA NATURAL GAS COMPANY: REQUIRE SERVICE REGULATOR TECHNICIANS TO TEST REGULATOR RELIEF VALVES WHEN PERFORMING MAINTENANCE TESTS OR RECONDITIONING REGULATORS TO DETERMINE THAT THESE VALVES OPERATE ACCORDING TO THE MANUFACTURER'S SPECIFICATIONS.\n\nPriority: CLASS II\n\nOverall Status: Closed - Acceptable Action\n\nIssued Date: 1992-04-29\n\nAdopted Date: 1992-04-09\n\nOverall Date Closed: 1995-08-21\n\nSynopsis: AT 7:02 P.M. CENTRAL STANDARD TIME ON JULY 5, 1991, AT TULSA, OKLAHOMA, HIGH-PRESSURE GAS ENTERED A LOW-PRESSURE, SINGLE-FAMILY CUSTOMER-SERVICE LINE CONNECTED TO A GAS METER AND REGULATOR IN A BURIED CONCRETE BOX NEAR THE CUSTOMER'S FRONT PROPERTY LINE. GAS AT 40-PSIG PRESSURE WAS SUPPLIED TO THE REGULATOR AND METER AT 3805 EAST 98TH STREET FROM A 2-INCH-DIAMETER PLASTIC GAS MAIN AND A 1 1/4-INCH-DIAMETER PLASTIC SERVICE LINE. THE HIGH-PRESSURE GAS ENTERED THE GAS FUEL LINES AND APPLIANCES RESULTING IN THE ESCAPE OF GAS INTO THE HOUSE. THERE WERE NO INJURIES, BUT THE GAS ESCAPING FROM THE FURNACES AND THE WATER HEATER IGNITED AND FUELED FIRES THAT DESTROYED THE MULTILEVEL HOUSE. PROPERTY DAMAGE WAS ESTIMATED BY THE TULSA FIRE DEPARTMENT AT 540,000.\n\nProbable Cause: Failure to ensure that the gas service regulator safety relief valve was adjusted properly\n\nNtsbnumber: DCA91FP009\n\nReport Number: None\n\nAddressee Name: Oklahoma Natural Gas Corporation\n\nAddressee Status: Closed - Acceptable Action\n\nAddressee Date Closed: 1995-08-21\n\nAddressee Acronym: Oneok\n\nAddressee Organization Type: P-Private Industry\n\nCommunication Date: 1995-08-21\n\nCommunication Type: Official Correspondence\n\nCommunication Contents: THE BOARD UNDERSTANDS THAT SERVICE REGULATOR TECHNICIANS TEST REINSTALLED REGULATOR RELIEF VALVES TO DETERMINE THAT THE VALVES ARE OPERATING TO SPECIFICATION. BASED ON THIS INFO P-92-4 IS CLASSIFIED \"CLOSED--ACCEPTABLE ACTION.\"\n\nAddressee Acronym: Oneok\n\nAddressee Organization Type: P-Private Industry\n\nCommunication Date: 1995-06-19\n\nCommunication Type: Official Correspondence\n\nCommunication Contents: SERVICE REGULATOR TECHNICIANS WILL TEST REGULATOR RELIEF VALVES THAT ARE TO BE REINSTALLED WHEN PERFORMING MANDATORY TESTS OR RECONDITIONING REGULATORS TO DETERMINE TO DETERMINE THAT SUCH VALVES OPERATE ACCORDING TO MANUFACTURER'S SPECIFICATION. IT WILL NOT BE BENEFICIAL TO TEST RELIEF VALVES ON THE REGULATORS THAT ARE BEING JUNKED SINCE THEY WILL BE REMOVED DURING MAINTENANCE OR SERVICE CALLS. THE OTHER REGULATORS THAT HAVE INTERNAL SPRING-LOADED REIEF VALVES WILL BE TESTED AS THEY ARE RECONDITIONED IN THE SHOP.\n\nAddressee Acronym: Oneok\n\nAddressee Organization Type: P-Private Industry\n\nCommunication Date: 1992-07-16\n\nCommunication Type: Official Correspondence","truncated":false,"body_characters":2772}