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Skills - steam
boiler manhole opening, Steam, tools, skills, scald, flash steam, safety, marine
industrial cartoon illustration, seaman, cadet, officer, crew, fun, laugh,
smile, gag, joke, industry, safety, steam turbine, boiler, mechanical, heat
exchanger, heater
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This is how it happened when you look from a distance. |
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Mabuk has opened up the manhole at the
bottom of the boiler, and now he is opening the top.
Because he has to carry the heavy tools, he thinks that it is more
convenient to open up the bottom manhole first.
Anyway, he thinks that by opening the bottom manhole, all the remaining
boiler water can be drained away more easily.
It's a big mistake!
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 Because the boiler is still hot, once the top manhole is opened, the
hot air tends to rise up together with flash steam.
Fresh air is
sucked up from the opened manhole at the bottom. A strong convection updraft of hot air rushes
up from the top manhole. Mabuk could be scalded if he is too near. Luckily,
he manages to dodge away from the strong current of hot air.
The correct way to do is to open the top manhole
first, followed by the bottom manhole.
By opening up the top manhole first, the updraft of hot air is quite
limited. When the bottom manhole is later opened, the person opening it will
not be scalded because the air is sucked in rather than pushed out.
A write-up about opening up boiler manholes appeared in our
Facworld Ezine on November 1, 2002. The ezine is
sent out to subscribers every month. Subscribing is Free. You will be able
to pick up useful pieces of information from it.
Subscribe now. |
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