Boiler Hot Lay up with tube deflection
Boiler Hot Lay up with tube deflection
(OP)
I have an O Type water tube boiler (1 steam/mud drum) that has been used for a Hot lay up while other boilers are producing superheated steam. What keeps this boiler warm is a lower drum heating coil. This keeps the boiler at the drum 220 deg F at 5psig. My question is when the boiler reaches that temp and pressure, should I open my superheater drain valves to drain the remaining condensate out of the superheater circuit? The temperature in the superheater circuit is 205 deg F. I will still have steam/condensate in the drums.
The reason I am asking is because the superheater tubes have experienced sagging tubes. I am thinking that the added weight of the water in the tubes have caused the sagging. Anyone an expert on tube deflection?
The reason I am asking is because the superheater tubes have experienced sagging tubes. I am thinking that the added weight of the water in the tubes have caused the sagging. Anyone an expert on tube deflection?





RE: Boiler Hot Lay up with tube deflection
RE: Boiler Hot Lay up with tube deflection
RE: Boiler Hot Lay up with tube deflection
To answer your question, yes, if your SH circuit is only 205F, it is condensing steam which would man that the SH tubes have water in them should the boiler suddenly be called upon to come on line. Is the SH loop drained at that time?
rmw
RE: Boiler Hot Lay up with tube deflection
RMW, That is the boiler hot standby set up that is at the plant I am at. Yes the superheater circuit has condensate in the tubes before it goes online. Operations never drains their superheater circuit. Because of the tube deflection, it has creted non drainable surfaces along the horizontal section of the superheater. I think operations should drain the superheater circuit when its in a standby mode. The mud drum coil can still keep the boiler setting at 220 deg F at 5-psig. What are your thoughts?
RE: Boiler Hot Lay up with tube deflection