NTSB Safety Recommendation P-86-008

NTSB safety recommendation P-86-008.

THE NTSB RECOMMENDS THAT THE ALABAMA GAS CORPORATION: DETERMINE THROUGH INSPECTION OF EACH VALVE AND PIPE SYSTEM IDENTIFIED BY NUMBER ON THE ENGINEERING FLOWSHEET THAT ALL VALVES AND PIPE SYSTEMS ARE IDENTIFIED CORRECTLY BY AN IDENTIFICATION TAG AND THAT EACH TAG IS LEGIBLE.

Priority: CLASS II

Overall Status: Closed - Acceptable Action

Issued Date: 1986-04-17

Adopted Date: 1986-03-22

Overall Date Closed: 1987-05-14

Synopsis: ABOUT 10:50 A.M., ON AUGUST 22, 1985, LIQUID METHANE WAS BEING DRAINED FROM THE COLD BOX INTO A VERTICAL ALUMINUM TANK 3 FEET IN DIAMETER AND 7 FEET TALL (VESSEL 17.23A) AT THE ALABAMA GAS CORPORATION'S (ALAGASCO) NATURAL GAS LIQUEFACTION PLANT IN PINSON, ALABAMA. THERE WAS NO PRESSURE GAUGE ON THE TANK. SHORTLY AFTER THE LIQUID METHANE BEGAN ENTERING VESSEL 17.23A, THE WELD ATTACHING AN 8 1/4-INCH BY 12-INCH ALUMINUM PLATE THAT WAS BEING USED TO COVER A HOLE THAT HAD BEEN CUT IN THE SIDE AT THE BOTTOM OF VESSEL 17.23A FAILED. THE PRESSURE WITHIN THE TANK PROPELLED THE PLATE 24 FEET AWAY INTO A BUILDING WHICH HOUSED A CONTROL ROOM, A BOILER ROOM, AND OFFICES. SOME OF THE WINDOWS IN THE CONTROL ROOM WERE BLOWN INWARD, AND METHANE ESCAPING FROM THE OPENING IN VESSEL 17.23A ENTERED THE BUILDING, WHERE IT WAS IGNITED BY ONE OF SEVERAL AVAILABLE IGNITION SOURCES. SIX PERSONS WERE INJURED, AND DAMAGE TO THE PLANT WAS ESTIMATED TO BE MORE THAN $1 MILLION.

Probable Cause: None

Ntsbnumber: DCA85FP018

Report Number: PAR-86-01-SUM

Addressee Name: Alabama Natural Gas Company

Addressee Status: Closed - Acceptable Action

Addressee Date Closed: 1987-05-14

Addressee Acronym: Alagasco

Addressee Organization Type: P-Private Industry

Communication Date: 1986-06-16

Communication Type: Official Correspondence

Communication Contents: UPON COMPLETION OF THE REVISED ENGINEERING FLOWSHEET, ALL VALVES AND PIPING SYSTEMS NUMBERED ON THE FLOWSHEET WILL BE TAGGED AND/OR NUMBERED. P-86-8 IS SCHEDULED TO BE IN COMPLIANCE BY 10/18/86.

Addressee Acronym: Alagasco

Addressee Organization Type: P-Private Industry

Communication Date: 1987-01-28

Communication Type: Official Correspondence

Communication Contents: AN INSPECTION HAS BEEN CONDUCTED OF ALL VALVES AND PIPING SYSTEMS AND COMPARED WITH IDENTIFYING NUMBERS ON THE REVISED ENGINEERING FLOWSHEETS AND ARE CORRECT. ALL VALVES HAVE BEEN TAGGED AND PIPE SYSTEM COLOR-CODED.

Addressee Acronym: Alagasco

Addressee Organization Type: P-Private Industry

Communication Date: 1987-05-14

Communication Type: Official Correspondence

Addressee Acronym: Alagasco

Addressee Organization Type: P-Private Industry

Communication Date: 1986-09-22

Communication Type: Official Correspondence