# NTSB Safety Recommendation P-93-021

- **operation:** document
- **citation:** P-93-021
- **title:** NTSB Safety Recommendation P-93-021
- **source type:** guidance
- **agency:** National Transportation Safety Board
- **status:** guidance
- **official:** true
- **published on:** 1993-12-15
- **effective on:** 1993-12-15
- **summary:** THE NTSB RECOMMENDS THAT THE AMERICAN GAS ASSOCIATION: COOPERATE WITH THE AMERICAN WITH THE AMERICAN PETROLEUM INSTITUTE IN COMPLETING RECOMMENDED SAFETY PRACTICES FOR THE DESIGN, CONSTRUCTION, OPERATION, AND MAINTENANCE OF SOLUTION-MINED STORAGE CAVERNS AND IN DEVELOPING RECOMMENDDED SAFETY PRACTICES FOR OTHER TYPES OF HIGHLY VOLATILE LIQUID AND NATURAL GAS UNDERGROUND STORAGE FACILITIES.
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- **source url:** https://data.ntsb.gov/carol-main-public/sr-details/P-93-021
**body:**

NTSB safety recommendation P-93-021.

THE NTSB RECOMMENDS THAT THE AMERICAN GAS ASSOCIATION: COOPERATE WITH THE AMERICAN WITH THE AMERICAN PETROLEUM INSTITUTE IN COMPLETING RECOMMENDED SAFETY PRACTICES FOR THE DESIGN, CONSTRUCTION, OPERATION, AND MAINTENANCE OF SOLUTION-MINED STORAGE CAVERNS AND IN DEVELOPING RECOMMENDDED SAFETY PRACTICES FOR OTHER TYPES OF HIGHLY VOLATILE LIQUID AND NATURAL GAS UNDERGROUND STORAGE FACILITIES.

Priority: CLASS II

Overall Status: Closed - Acceptable Action

Issued Date: 1993-12-15

Adopted Date: 1993-11-04

Overall Date Closed: 2001-03-29

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: American Gas Association

Addressee Status: Closed - Acceptable Action

Addressee Date Closed: 2001-03-29

Addressee Acronym: AGA

Addressee Organization Type: A-Associations

Communication Date: 2000-08-23

Communication Type: Official Correspondence

Communication Contents: Letter Mail Controlled 08/30/2000 4:14:50 PM MC# 2001184 The objectives of these recommendations were completed with the publishing of two API standards. RP 1114, Design of Solution-Mined Underground Storage Facilities and RP 1115, Operation of Solution-Mined Underground Storage Facilities provide guidance to address the concerns of safety recommendations P-93-21 and P-93-22. Accordingly, AGA urges the NTSB to close this safety recommendation.

Addressee Acronym: AGA

Addressee Organization Type: A-Associations

Communication Date: 1994-04-19

Communication Type: Official Correspondence

Communication Contents: BECAUSE THERE ARE FEW SIMILARITIES BETWEEN LIQUID & GAS STORAGE, WE BELIEVE API IS BETTER QUALIFIED TO DEVELOP RECOMMENDED PRACTICES FOR SOLUTION-MINED CAVERNS FOR HVL STORAGE.

Addressee Acronym: AGA

Addressee Organization Type: A-Associations

Communication Date: 1994-06-07

Communication Type: Official Correspondence

Communication Contents: THE BOARD NOTES THAT API IN COOPERATION WITH THE AGA IS CURRENTLY DEVELOPING TWO STANDARDS, RECOMMENDED PRACTICES 1114 & 1115, ON SOLUTION-MINED STORAGE CAVERNS. PENDING THE PUBLICATION OF THESE STANDARDS, P-93-21 IS CLASSIFIED "OPEN--ACCEPTABLE RESPONSE."

Addressee Acronym: AGA

Addressee Organization Type: A-Associations

Communication Date: 2000-06-14

Communication Type: Official Correspondence

Communication Contents: THE SAFETY BOARD WOULD APPRECIATE LEARNING OF ANY ACTIONS TAKEN OR PLANNED TO COMPLY WITH THESE RECOMMENDATIONS.

Addressee Acronym: AGA

Addressee Organization Type: A-Associations

Communication Date: 2001-03-29

Communication Type: Official Correspondence

Communication Contents: Because the AGA cooperated with API in completing API Recommended Practice (RP) 1114, Design of Solution-Mined Underground Storage Facilities and RP 1115, Operation of Solution-Mined Underground Storage Facilities, which provides the recommended guidance, Safety Recommendation P?93-21 is classified “Closed--Acceptable Action.”
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