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Many thanks for the posts. Having had a look at the system, it appears that we have a large dead leg on the spray water system (when not in use) allowing the spary water to drop to ambient temperature. From davefitz post advice, we will add bleeds (themostatic control valve) to the spray...

The desuperheater has been visually and subject to some NDT and the cracking appears to be in the nozzle and the internal surface (liner?) of the desuperheater.

I am currently experiencing cracking in several desuperheaters, and cannot work out why, as they have been ok in the past. The only condition that I can see that does not meet the the data sheet requirements is the spray water pressure, which is 1 -2 Bar high. Is this likely to cause problems...

I am looking for information relating to UV flame detection in furnaces. Mainly how Un-burnt gas attenuates various parts of the UV spectrum. Any help would be great.

I am looking for information relating to UV flame detection in furnaces. Mainly how Un-burnt gas attenuates various parts of the UV spectrum.

I have beeen trying to find a simple calculation to determine the heat lost from a pipe to the atmosphere. I can measure the surface temp of the pipe and the air temp, really I am strugling to determine the heat transfer coefficient. Any help would be appreciated. This is to be used as a...

I am currently having problems with a torsion bar relief valve. In the past the valve has lifted light, chattered or had too long a blowdown. If the blowdown is adjusted the valve seems very sensitive to it, i.e. 5% setting change can result in the valve changing from 19% blowdown to almost no...

I am currently having problems with a torsion bar relief valve. The valve will lift light, chatter or have too long a blowdown, depending on the blowdown setting. Does the blowdown setting affect the lift point? Running out of ideas to stop the problems, any advice?