# NTSB Safety Recommendation P-93-012 **Citation:** P-93-012 **Type / status:** guidance / guidance **Agency:** National Transportation Safety Board **Effective:** 1993-12-15 **Published:** 1993-12-15 THE NTSB RECOMMENDS THAT THE MAPCO NATURAL GAS LIQUIDS, INC.: DEVELOP PROCEDURES FOR DISPATCHERS AND ON-SCENE EMPLOYEES TO FOLLOW WHEN GATHERING PRODUCT-RELEASE INFORMATION DURING AN EMERGENCY TO HELP ENSURE THAT EMPLOYEES PROMPTLY DISSEMINATE ESSENTIAL INFORMATION TO COMPANY AND COMMUNITY OFFICIALS RESPONSIBLE FOR EMERGENCY RESPONSE ACTIONS. ## Document text NTSB safety recommendation P-93-012. THE NTSB RECOMMENDS THAT THE MAPCO NATURAL GAS LIQUIDS, INC.: DEVELOP PROCEDURES FOR DISPATCHERS AND ON-SCENE EMPLOYEES TO FOLLOW WHEN GATHERING PRODUCT-RELEASE INFORMATION DURING AN EMERGENCY TO HELP ENSURE THAT EMPLOYEES PROMPTLY DISSEMINATE ESSENTIAL INFORMATION TO COMPANY AND COMMUNITY OFFICIALS RESPONSIBLE FOR EMERGENCY RESPONSE ACTIONS. Priority: CLASS II Overall Status: Closed - Acceptable Action Issued Date: 1993-12-15 Adopted Date: 1993-11-04 Overall Date Closed: 1995-05-01 Synopsis: ON APRIL 7, 1992, AN UNCONTROLLED RELEASE OF HIGHLY VOLATILE LIQUIDS (HVLS) FROM A SALT DOME STORAGE CAVERN IN THE SEMINOLE PIPELINE SYSTEM NEAR BRENHAM, TEXAS, FORMED A LARGE, HEAVIER-THAN-AIR GAS CLOUD THAT EXPLODED. THREE PEOPLE DIED FROM INJURIES SUSTAINED EITHER FROM THE BLAST OR IN THE FIRE. AN ADDITIONAL 21 PEOPLE WERE TREATED FOR INJURIES AT AREA HOSPITALS. DAMAGE FROM THE ACCIDENT EXCEEDED $9 MILLION. Probable Cause: None Ntsbnumber: DCA92MP006 Report Number: PAR-93-01 Addressee Name: MAPCO Natural Gas Liquids, Inc. Addressee Status: Closed - Acceptable Action Addressee Date Closed: 1995-05-01 Addressee Organization Type: P-Private Industry Communication Date: 1994-01-31 Communication Type: Official Correspondence Communication Contents: P-93-11 HAS BEEN INCORPORATED INTO MAPL'S PROCESS SAFETY MANUALS & WILL BE ADDED TO THE PROCEDURES MANUALS FOR COMPLIANCE WITH 49 CFR 195. P-93-12 ALSO IS BEING INCORPORATED INTO THE CURRENT REWRITE OF THE PROCEDURAL MANUAL. Addressee Organization Type: P-Private Industry Communication Date: 1995-01-05 Communication Type: Official Correspondence Communication Contents: IF A LEAK IS REPORTED BY A MEMBER OF THE PUBLIC OR AN EMPLOYEE, A REPORT OF LEAK QUESTIONNAIRE IS USED TO RECORD INFO. COPIES OF THE FORM ARE KEPT IN THE CENTRAL DISPATCH OFFICE IN TULSA. Addressee Organization Type: P-Private Industry Communication Date: 1994-05-26 Communication Type: Official Correspondence Communication Contents: THE BOARD IS PLEASED THAT RECOMMENDATIONS P-93-11 & -12 HAVE BEEN INCORPORATED INTO MAPL'S PROCESS SAFETY MANUALS & WILL ULTIMATELY BE INCORPORATED INTO ITS PROCEDURAL MANUALS. WHEN THIS WORK IS COMPLETE, WE WOULD APPRECIATE RECEIVING A COPY OF THE SECTIONS THAT HAVE BEEN REVISED TO INCORPORATE THE INTENT OF THESE RECOMMENDATIONS. IN THE INTERIM, THE BOARD HAS CLASSIFIED P-93-11 AND -12 "OPEN--ACCETPTABLE RESPONSE." Addressee Organization Type: P-Private Industry Communication Date: 1995-05-01 Communication Type: Official Correspondence Communication Contents: THE BOARD UNDERSTANDS THAT SEMINOLE HAS DEVELOPED A "REPORT OF LEAK QUESTIONNAIRE" THAT DISPATCHERS & ON-SCENE EMPLOYEES USE TO RECORDD INFO REPORTED BY THE PUBLIC OR EMPLOYEES. INFO OBTAINED WILL BE PROVIDED TO BOTH COMPANY & COMMUNITY OFFICIALS RESPONSIBLE OR ON-SCENE EMERGENCY RESPONSE. THEREFORE P-93-012 HAS BEEN CLASSIFIED "CLOSED--ACCEPTABLE ACTION." ## Provenance - Official: Yes - Source: - Source ID: `ntsb-pipeline` - SHA-256: `07776b8d4301afa941cb496b1df9c67b81830234ac05063609fea528fdaac1be` - Retrieved: 2026-08-20T04:57:24.741Z - Exported: 2026-08-23T21:50:34.215Z - Document slug: `ntsb-recommendation-p-93-012` ### Source metadata ```json { "recordKind": "ntsb_safety_recommendation", "safetyRecommendationNumber": "P-93-012", "recommendationMode": "Pipeline", "topicMode": "Pipeline", "ntsbNumber": "DCA92MP006", "priority": "CLASS II", "overallStatus": "Closed - Acceptable Action", "overallStatusAcronym": "CAA", "overallDateClosed": "1995-05-01", "lastModifiedDate": "2016-11-15", "reportNumber": "PAR-93-01", "reportUrl": "https://www.ntsb.gov/investigations/Pages/DCA92MP006.aspx", "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P93_10_14.pdf", "addressees": [ { "addresseeName": "MAPCO Natural Gas Liquids, Inc.", "addresseeStatusAcronym": "CAA", "addresseeStatus": "Closed - Acceptable Action", "addresseeDateClosed": "1995-05-01", "addresseeDetails": [ { "addresseeAcronym": null, "addresseeOrganizationType": "P-Private Industry", "isFromNtsb": false, "communicationDate": "1994-01-31", "communicationType": "Official Correspondence", "communicationContents": "P-93-11 HAS BEEN INCORPORATED INTO MAPL'S PROCESS SAFETY MANUALS & WILL BE ADDED TO THE PROCEDURES MANUALS FOR COMPLIANCE WITH 49 CFR 195. P-93-12 ALSO IS BEING INCORPORATED INTO THE CURRENT REWRITE OF THE PROCEDURAL MANUAL." }, { "addresseeAcronym": null, "addresseeOrganizationType": "P-Private Industry", "isFromNtsb": false, "communicationDate": "1995-01-05", "communicationType": "Official Correspondence", "communicationContents": "IF A LEAK IS REPORTED BY A MEMBER OF THE PUBLIC OR AN EMPLOYEE, A REPORT OF LEAK QUESTIONNAIRE IS USED TO RECORD INFO. COPIES OF THE FORM ARE KEPT IN THE CENTRAL DISPATCH OFFICE IN TULSA." }, { "addresseeAcronym": null, "addresseeOrganizationType": "P-Private Industry", "isFromNtsb": true, "communicationDate": "1994-05-26", "communicationType": "Official Correspondence", "communicationContents": "THE BOARD IS PLEASED THAT RECOMMENDATIONS P-93-11 & -12 HAVE BEEN INCORPORATED INTO MAPL'S PROCESS SAFETY MANUALS & WILL ULTIMATELY BE INCORPORATED INTO ITS PROCEDURAL MANUALS. WHEN THIS WORK IS COMPLETE, WE WOULD APPRECIATE RECEIVING A COPY OF THE SECTIONS THAT HAVE BEEN REVISED TO INCORPORATE THE INTENT OF THESE RECOMMENDATIONS. IN THE INTERIM, THE BOARD HAS CLASSIFIED P-93-11 AND -12 \"OPEN--ACCETPTABLE RESPONSE.\"" }, { "addresseeAcronym": null, "addresseeOrganizationType": "P-Private Industry", "isFromNtsb": true, "communicationDate": "1995-05-01", "communicationType": "Official Correspondence", "communicationContents": "THE BOARD UNDERSTANDS THAT SEMINOLE HAS DEVELOPED A \"REPORT OF LEAK QUESTIONNAIRE\" THAT DISPATCHERS & ON-SCENE EMPLOYEES USE TO RECORDD INFO REPORTED BY THE PUBLIC OR EMPLOYEES. INFO OBTAINED WILL BE PROVIDED TO BOTH COMPANY & COMMUNITY OFFICIALS RESPONSIBLE OR ON-SCENE EMERGENCY RESPONSE. THEREFORE P-93-012 HAS BEEN CLASSIFIED \"CLOSED--ACCEPTABLE ACTION.\"" } ] } ], "jurisdiction": "US" } ```