a factory producing Hexamethyl Disilazane, Trimethyl
chlorosilane, chlorinated paraffin wax, on 4-5-2002
at about 22.40 hours. there was an explosion in the
reactor followed by fire.
In PPFRP Reactor, 300 liter. Water was taken and 1600
kg. HM2 residue (un-reacted/distilled crude TMCS
Trimethyl chlorosilane which contains HMDO (Hexamethyl
disiloxane and TMCS) was charged by pump, then PPFRP
reactor stirrer was started for 10 minutes. Then it
was allowed to settle for 10 minutes. Then water (Acidic)
were removed from the bottom valve. The reactor stirrer
was stated and 5 to 10% HCL/water mixture was charged.
Immediately after that, there was an explosion in
the reactor followed by fire. Because of the fire,
reactor bottom was broke and 1600 kg. material splashed.
Cause of the incident:
In PPFRP Reactor neutralization was going on. During
neutralization process, bottom valve of PPFRP vessel
was closed and titanium wire was connected to the
gaskets. PVC coated copper wire, which was acting
as an earthing wire was broken or loose or because
of some other reason the earthing continuity was broken.
Static charge, which was generated, was not removed
effectively. This came in contact with HMDO, TMCS
and toluene vapour, which were present in PPFRP reactor.
Which resulted in a fire in the PPFRP reactor.
Area & persons affected:
Because of this fire 2 workers died and 4 received
burn injuries. Due to this fire 2 ammonia cylinders
burst. HMDO and TMCS, both having low flash point
(-1ºC and 20ºC respectively), caught
fire and spread into the entire factory. Machinery,
equipment of CPW plant and chlorine shed were damaged
due to fire. Five chlorine tonner (out of which 1
tonner was full and other 4 tonner were partially
filled) exploded due to heat generated by fire. Many
drums of raw material and finished products of CPW
plant burst. Material in the 2 storage tanks of TMCS
and 1 tank of HMDS charred due to the fire. HMDS/TMCS
plant was completely destroyed. RCC structure of CPW
plant was also damaged.
Action to be taken for non repetition of such incident:
¨ Reactor for carrying out neutralization/washing
process shall be made of effective material.
¨ Instead of single earthing, multi point effective
earthing shall be provided to reactor for neutralization/washing
process and it shall be maintained.
¨ Reactor wherein neutralization -washing process
is carried out shall be isolated from other process
by fire resistance wall.