Boiler Desuperheater Drain Line Diameter Design Specifications

Someone in the process group needs to define the quantity of condensate expected to be formed and based on that is that you design your condensate line size

towz.....

Typically, this drain is part of the scope supplied by the boiler vendor. So, by installing a new drain on an existing plant, you are performing a major boiler modification because you are within the boiler pressure boundary.

This is not just another piece of piping...

We don't know where you are located, but in most parts of the civilized world, boiler modifications must be designed, performed, inpected and tested by an approved organization

Boiler repairs in the USA must be performed by a shop that has an ASME "R" stamp and ( possiblely) an NB stamp

Just in case you are asked.....

The size of the drain is determined by the amount of time that you want to wait for drainage.

Ok, perhaps I should have been more specific as to where exactly these drain lines will be situated. The drains will be used to drain the spray water section of pipe that supplies the desuperheater (there are two spray water stations per desuoperheater, so one can be shut down whilst the other undergoes maintenance). So its not really regarded as a vital project, as the station has be running without them for about 20 years, its just become a safety issue recently. I am only a student working on this, so all my work is going to be redone by a professional engineer, so I just need some type of formula (preferably from ASME standards) to determine a realistic drain line diameter (as I have absolutely no experience in this). Again any help whatsoever would be very much appreciated.