{"operation":"document","citation":"P-70-027","title":"NTSB Safety Recommendation P-70-027","source_type":"guidance","agency":"National Transportation Safety Board","status":"guidance","official":true,"published_on":"1969-12-04","effective_on":"1969-12-04","summary":"THE NTSB RECOMMENDS THAT ALL STATES, THE DISTRICT OF COLUMBIA, AND PUERTO RICO TAKE THE FOLLOWING ACTION: REQUIRE ALL GAS UTILITIES TO USE WRITTEN PLANS FOR CONVERSIONS OF LOW-PRESSURE DISTRIBUTION SYSTEMS TO HIGHER PRESSURE TO INSURE THAT APPROPRIATE SAFETY PRECAUTIONS ARE TAKEN TO PROTECT THE PUBLIC.","machine_formats":{"json":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-70-027.json","markdown":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-70-027.md"},"app_url":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-70-027","source_url":"https://data.ntsb.gov/carol-main-public/sr-details/P-70-027","body":"NTSB safety recommendation P-70-027.\n\nTHE NTSB RECOMMENDS THAT ALL STATES, THE DISTRICT OF COLUMBIA, AND PUERTO RICO TAKE THE FOLLOWING ACTION: REQUIRE ALL GAS UTILITIES TO USE WRITTEN PLANS FOR CONVERSIONS OF LOW-PRESSURE DISTRIBUTION SYSTEMS TO HIGHER PRESSURE TO INSURE THAT APPROPRIATE SAFETY PRECAUTIONS ARE TAKEN TO PROTECT THE PUBLIC.\n\nPriority: CLASS II\n\nOverall Status: Closed--No Longer Applicable\n\nIssued Date: 1969-12-04\n\nAdopted Date: 1969-12-04\n\nOverall Date Closed: 1976-07-20\n\nSynopsis: ON JUNE 3, 1969, A SERIES OF EXPLOSIONS AND FIRES OCCURRED IN THE NATURAL GAS DISTRIBUTION SYSTEM IN THE WESTERN HALF OF THE GLEN PARK RESIDENTIAL SUBDIVISION OF GARY, INDIANA. THERE WERE NO FATALITIES, BUT NINE RESIDENTS AND FIVE FIREMEN WERE INJURED. SEVEN HOUSES WERE DESTROYED, AND 45 OTHERS INCURRED DAMAGE EXTENDING FROM MINOR TO VIRTUAL DESTRUCTION. TOTAL PROPERTY DAMAGE WAS ABOUT $350,000.\n\nProbable Cause: The Board finds that the probable cause of this accident was a combination of personnel error and system inadequacy. Involved were the inadvertent opening of a separation valve by a gas company employee allowing gas at 20 p.s.i.g. to flow into a 1/4 p.s,i,g. system and a system which could not control adequately such an increase in pressure owing to the lack of overpressure protection devices. Thereafter, the increase in pressure caused the failure of a regulator diaphragm which allowed an 80-fold overpressure in the low-pressure system to become continuous for 30 - 45 minutes. Significant contributing causal factors were: 1. The inaccessibility of the shutoff valve for the regulator which failed. 2. The lack of systematic review of the hazards in the conversion operation which could have revealed the hazardous condition in which one human error could produce catastrophe, coupled with the lack of a written plan for conversion. 3. The absence in Code B31.8 of any specification of safeguards to be employed at separation (isolation) valves during pressure conversions. 4. The lack of complete leakage surveys, before and during the pressure increase in the eastern area, which would have probably disclosed and leaking condition of the pipe and avoided the major leaks which occurred on June 3, 1969.\n\nNtsbnumber: DCA69FP004\n\nReport Number: PAR-UNNUMBERED\n\nAddressee Name: State of Wyoming\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of West Virginia\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Washington\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: Commonwealth of Virginia\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Vermont\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Utah\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Texas\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Tennessee\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of South Dakota\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of South Carolina\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Rhode Island\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: Commonwealth of Pennsylvania\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Oregon\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Oklahoma\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Ohio\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of North Dakota\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of North Carolina\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of New York\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of New Mexico\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of New Jersey\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of New Hampshire\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Nevada\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Nebraska\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Montana\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Missouri\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Mississippi\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Minnesota\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Michigan\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: Commonwealth of Massachusetts\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Maryland\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Maine\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Louisiana\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: Commonwealth of Kentucky\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Kansas\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Iowa\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Indiana\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Illinois\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Idaho\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Hawaii\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Georgia\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Florida\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Delaware\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Connecticut\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Colorado\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of California\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Arkansas\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Arizona\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Alaska\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: State of Alabama\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: Commonwealth of Puerto Rico\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20\n\nAddressee Name: District of Columbia\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1976-07-20","truncated":false,"body_characters":8367}