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Home » News from Thailand » Featured » Factory boiler explodes: 22 injured
Factory boiler explodes: 22 injured
The explosion of a boiler at a factory in Samut Prakan province on Saturday night injured 22 people, five of them seriously.
The force of the blast blew the roof off the factory building and the flames spread, severely damaging ten wooden houses behind the factory.
Most of the injured are migrant workers from Myanmar. Textiles are dyed in the factory. The police suspect that the boiler exploded because it did not contain enough water.
Watchara Narapakdikul, tenant of the factory and operator of the dyehouse, says she takes full responsibility for the injuries and damage.
(Source: Bangkok Post, August 18, 2014; website August 17, 2014)
"Police suspect that the kettle exploded because it didn't contain enough water."
You would think that something like this can't happen if you check your drum level protections every year. Undoubtedly, a lot of heating was done at a low water level. Because if there is overpressure, the pressure relief valve will have to open. Unless this safety has also not been periodically overhauled.
It would be extremely culpable if the safety devices had been bridged manually.
For years, I have commissioned Konus boilers with Weishaupt burners worldwide. With regular inspection and checking of the safety fittings, there were never any problems. After all, if the pressure was increased or the water level was too low, the burner (the heating unit) was automatically switched off. In order to be able to continue production, I sometimes found irregularities during the inspection. Always by human intervention. The fireman put it right.
Serious.
I've never really been in favor of cutting back on boiler house workers. Especially, if this also cuts down on know-how. It is beautiful and responsible work and from a distance it is soon judged that the man can easily leave. Consequence, overdue maintenance, no inspection rounds and possible risk of improper intervention, for example in the case of frequent blowing off of the boiler.
Boiler house crew and competence (certifcates) is regulated by law in Thailand. You cannot cut below the legal safe minimum.
Steam boilers, in this case it resembles a Scottish boiler, have a number of safety features.
For example, you have the instrumental protection that stops the fire stop to burners, for example in case of much too low drum level, too high pressure, too high temperatures.
There are mechanical safety devices, such as the pressure safety devices that blow off steam to the outside when the pressure is too high, but not yet dangerous. There is also the famous blakcflute which melts a wad of lead and produces a very loud whistle, and there is more
Steam boilers go through a statutory inspection, with these types of old boilers I think every year where the safety is checked in particular. Not good and the boiler may no longer be used.
Here you can indeed think of the failure of pressure relief valves and some more, or shutting down which could not be possible because the Thai equivalent of “the steam creature” does not allow shut-off valves at these pressure relief devices.
So, Thais have messed around and inspection has been made to look the other way
I hope there is a sequel to this story
The fact that someone deliberately boils with too little water is not acceptable in a dye house. That requires a lot of steam. So the pressure has been allowed to rise too high and safety devices (Thermo Relief valve-Pressure high valve etc.) have been put out of action. This way, if all goes well, you still get enough steam with an old boiler that is too small.
That goes well until the thing explodes. Guaranteed not too little water. Because then you don't have enough steam and the boiler cannot explode, at most it can burn through.
That is not a problem only in Thailand. I have often experienced this, in a slightly different form, at various chemical companies, for example in the Botlek-Moerdijk-Maasvlakte. There, too, so-called ESD protections are set incorrectly, not revised in time or by all kinds of tricks of the operators, bypassed and rendered inoperative.
Tip labor inspection? That would be a good thing and potentially save lives