# NTSB Safety Recommendation P-77-035 **Citation:** P-77-035 **Type / status:** guidance / guidance **Agency:** National Transportation Safety Board **Effective:** 1977-10-31 **Published:** 1977-10-31 ADD TO 49 CFR 192 A REQUIREMENT FOR PNEUMATIC-OPERATED COMPRESSOR STATION EQUIPMENT, SIMILAR TO THE REQUIREMENT IN 49 CFR 192.167(3) FOR ELECTRIC-OPERATED EQUIPMENT, TO ISOLATE INSTRUMENT AIR SUPPLY TO AUTOMATIC FACILITIES, AND TO PROVIDE BACKUP OR SEPARATE EMERGENCY PNEUMATIC FACILITIES. ## Document text NTSB safety recommendation P-77-035. ADD TO 49 CFR 192 A REQUIREMENT FOR PNEUMATIC-OPERATED COMPRESSOR STATION EQUIPMENT, SIMILAR TO THE REQUIREMENT IN 49 CFR 192.167(3) FOR ELECTRIC-OPERATED EQUIPMENT, TO ISOLATE INSTRUMENT AIR SUPPLY TO AUTOMATIC FACILITIES, AND TO PROVIDE BACKUP OR SEPARATE EMERGENCY PNEUMATIC FACILITIES. Priority: CLASS III Overall Status: Closed - Unacceptable Action Issued Date: 1977-10-31 Adopted Date: 1977-10-13 Overall Date Closed: 1985-09-03 Synopsis: ON DECEMBER 7, 1976, A NATURAL GAS COMPRESSOR FAILED AND THEN EXPLODED AND BURNED AT AN EXXON GAS SYSTEM, INC., STATION NEAR ROBSTOWN, TEXAS. AN EMERGENCY SHUTDOWN SYSTEM WAS ACTIVATED, BUT FOUR AUTOMATED FIRE GATE VALVES DID NOT CLOSE. ANOTHER EMERGENCY CONTROL SYSTEM ALSO FAILED TO AUTOMATICALLY CLOSE THE SHUTOFF VALVES LEADING TO TWO OF THE FIVE COMPRESSORS IN THE STATION. A SECOND EXPLOSION OCCURRED WITHIN THE BURNING BUILDING. THE FIRE KILLED ONE PERSON, INJURED TWO PERSONS, AND DESTROYED THREE ENGINE-DRIVEN COMPRESSORS AND THE COMPRESSOR BUILDING. Ntsbnumber: DCA77MP005 Report Number: PAR-77-03 Addressee Name: RSPA Addressee Status: Closed - Unacceptable Action Addressee Date Closed: 1985-09-03 Addressee Acronym: RSPA Addressee Organization Type: G-Federal Government Communication Date: 1978-11-17 Communication Type: Official Correspondence Communication Contents: LETTER FROM MTB: MTB COMPLETELY CONCURS WITH THIS RECOMMENDATION AND WILL INCORPORATE THIS PROJECT IN DEVELOPING THE REGULATORY SCHEDULE COMMENCING IN JANUARY OF 1979. Addressee Acronym: RSPA Addressee Organization Type: G-Federal Government Communication Date: 1983-03-21 Communication Type: Official Correspondence Communication Contents: RSPA LETTER: INCIDENTS INVOLVING VALVES AT COMPRESSOR STATIONS HAVE, ON THE AVERAGE, BEEN SIGNIFICANTLY LOWER SINCE 1976. AND INCIDENTS INVOLVING FITTINGS AT COMPRESSOR STATIONS HAVE ALSO DECLINED -- AGAIN, BOTH IN ABSOLUTE AND RELATIVE TERMS. DURING 1970-1976, THE AVERAGE ANNUAL NUMBER OF INCIDENTS FOR COMPRESSOR STATIONS WAS 23.6; DURING THE PERIOD FROM 1977 TO THE PRESENT, THIS NUMBER HAS DROPPED TO 15.2. THE MTB'S COMPLIANCE AND ENFORCEMENT PROGRAM HAS ALSO EMPHASIZED TO OPERATORS THE NEED TO MEET THE COMPRESSOR STATION BLOWDOWN REQUIREMENTS OF 49 CFR 192.167(A) AND TO INSURE THAT TORQUING PROCEDURES RECOMMENDED BY EQUIPMENT MANUFACTURERS ARE FOLLOWED. Addressee Acronym: RSPA Addressee Organization Type: G-Federal Government Communication Date: 1985-09-03 Communication Type: Official Correspondence Addressee Acronym: RSPA Addressee Organization Type: G-Federal Government Communication Date: 1979-01-22 Communication Type: Official Correspondence ## Provenance - Official: Yes - Source: - Source ID: `ntsb-pipeline` - SHA-256: `8a3f85e1b56e5827611af077720de5abdd9139888726573531d2a331bfc0d098` - Retrieved: 2026-08-20T04:57:24.741Z - Exported: 2026-08-22T15:38:21.567Z - Document slug: `ntsb-recommendation-p-77-035` ### Source metadata ```json { "recordKind": "ntsb_safety_recommendation", "safetyRecommendationNumber": "P-77-035", "recommendationMode": "Pipeline", "topicMode": "Pipeline", "ntsbNumber": "DCA77MP005", "priority": "CLASS III", "overallStatus": "Closed - Unacceptable Action", "overallStatusAcronym": "CUA", "overallDateClosed": "1985-09-03", "lastModifiedDate": "2016-11-15", "reportNumber": "PAR-77-03", "reportUrl": "https://www.ntsb.gov/investigations/Pages/DCA77MP005.aspx", "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P77_34_36.pdf", "addressees": [ { "addresseeName": "RSPA", "addresseeStatusAcronym": "CUA", "addresseeStatus": "Closed - Unacceptable Action", "addresseeDateClosed": "1985-09-03", "addresseeDetails": [ { "addresseeAcronym": "RSPA", "addresseeOrganizationType": "G-Federal Government", "isFromNtsb": false, "communicationDate": "1978-11-17", "communicationType": "Official Correspondence", "communicationContents": "LETTER FROM MTB: MTB COMPLETELY CONCURS WITH THIS RECOMMENDATION AND WILL INCORPORATE THIS PROJECT IN DEVELOPING THE REGULATORY SCHEDULE COMMENCING IN JANUARY OF 1979." }, { "addresseeAcronym": "RSPA", "addresseeOrganizationType": "G-Federal Government", "isFromNtsb": false, "communicationDate": "1983-03-21", "communicationType": "Official Correspondence", "communicationContents": "RSPA LETTER: INCIDENTS INVOLVING VALVES AT COMPRESSOR STATIONS HAVE, ON THE AVERAGE, BEEN SIGNIFICANTLY LOWER SINCE 1976. AND INCIDENTS INVOLVING FITTINGS AT COMPRESSOR STATIONS HAVE ALSO DECLINED -- AGAIN, BOTH IN ABSOLUTE AND RELATIVE TERMS. DURING 1970-1976, THE AVERAGE ANNUAL NUMBER OF INCIDENTS FOR COMPRESSOR STATIONS WAS 23.6; DURING THE PERIOD FROM 1977 TO THE PRESENT, THIS NUMBER HAS DROPPED TO 15.2. THE MTB'S COMPLIANCE AND ENFORCEMENT PROGRAM HAS ALSO EMPHASIZED TO OPERATORS THE NEED TO MEET THE COMPRESSOR STATION BLOWDOWN REQUIREMENTS OF 49 CFR 192.167(A) AND TO INSURE THAT TORQUING PROCEDURES RECOMMENDED BY EQUIPMENT MANUFACTURERS ARE FOLLOWED." }, { "addresseeAcronym": "RSPA", "addresseeOrganizationType": "G-Federal Government", "isFromNtsb": true, "communicationDate": "1985-09-03", "communicationType": "Official Correspondence", "communicationContents": "" }, { "addresseeAcronym": "RSPA", "addresseeOrganizationType": "G-Federal Government", "isFromNtsb": true, "communicationDate": "1979-01-22", "communicationType": "Official Correspondence", "communicationContents": "" } ] } ], "jurisdiction": "US" } ```