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Cmolanes on What would be the pressure inside a shell boiler?

By: cmolanes@itba.edu.ar [50] 4 Stars
Date: Saturday, October 21, 2017
Time: 8:41:00 PM

Hullo, Mr. B.

I am trying to understand your operators point of view, but I can say that if water level goes down is because you are needing steam, and in such quantities that you are extracting more than the water you are supplying with the pump.

If so, you should not cease feeding, because you will end up with no steam, in contradiction to the fact that you are actually needing steam. Of course, you are right to say that with less water level in a vertical smoke-tube boiler you will have less effective heating area interchanging heat, but I do not know if an equilibrium point will be eventually reached, so ignoring this, I would keep a water level near the NWL. Remember that, as was said in another reply, with no water, and with steam in the boiler, it will begin working as a superheater.

I read the DNV report on the boiler Mr. Watts indicated, but your boiler, being smoke-tube, not water-tube, should be safer in this respect in my opinion nontheless, you should avoid extreme rapid temperature changes, to avoid eventual thermal cracks or future water leaks to appear. The operating instructions should cover these circumstances.

If the tubes accumulate too much soot, you would notice a decrease in steam production, but normally soot cleaning must be done mechanically, opening the boiler with the main engine stopped, impossible whilst sailing, as far as I know.

When you mention the auxiliary HEx to condensate excess steam, I imagine you meant to say that the condensate is led to the feed-water tank, but not necesarily straight back to the boiler, so you still have complete control of the water you feed the boiler with.

I hope I am giving you a clarifying answer, or at least, a little.

Claudio Molanes






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