Presentation on theme: "Chalmette Refinery 04-12-05. Date & Time Incident Started: 4/11/05 12:10:00 PM Incident Description: During inspection of K-2308 H2 make up compressor."— Presentation transcript:
Date & Time Incident Started: 4/11/05 12:10:00 PM Incident Description: During inspection of K-2308 H2 make up compressor it was discovered that a bolt resting on the 4th stage suction piping had worn a hole in the pipe and caused the release of make up hydrogen. The compressor was taken off line the depressured. ICAR
1/4 stainless steel screw and nut. Designed for strength and corrosion resistance
Side view of schedule 160 pipe. Designed to withstand high pressure
The screw and nut mounted a temp gauge to a stainless steel plate.
The gauge was mounted at this height. Higher than this photo depicts. Back of plate was not obvious from the walk way. So, it was not visible to operators making their rounds Gauge
The screw and nut were touching the pipe at this height The screw and nut Gauge
It appears that the inner wall of the sch. 160 pipe may have just been penetrated and began leaking Hydrogen because of the rubbing action of the screw and nut
The nut actually fit inside of the hole
Nut & washer Screw Wall of pipe Mounting bracket Point of contact
Close up of screw and nut that cut through the pipe
Section of pipe removed for repair. Bracket hanging from thermo coupling wire
Section of pipe removed for repair. Location of hole
Two mechanics from Dressor Rand happened to hear the leak when they were working the compressor and contacted our operators. The operators responded immediately and safely shut the compressor down
Gerald Labarrere, stillperson of the HC unit, thanks Ronald Ratcliff and Mark Majorie, of Dressor Rand, for catching and reporting the leak
On behalf of the JH&SC, Mike Fandal, ExxonMobil execution supervisor, presents Mark and Ronald Ratcliff, with a Safety award
Its hard to believe that a 1/4 screw......
in just the right position, could cause such a potential situation.
Hydrogen Release Potential ?
Is there any equipment in your area that might be vibrating and touching other equipment? Is there any equipment in your area that might be vibrating and touching other equipment? R.Evans JH&SC