Temperature is related to pressure. If you reach your design temperature, you must be reaching your design pressure as well. If you go above your design pressure, you will lift your safety relief valves, loose your steam too quickly for the feed water to keep up and trip on low level cutout.
A...
vernierb
This is tough to answer. How well have they been taken care of. Do you have any refractory issues? Are you looking for better efficiency or do you have emission requirements to meet. Sometimes installing a better control system is all that is necessary.
I've worked on so many...
Just curious why the process is not deciding this for you? e.g. 700lb MAWP boiler operating at 475psig with reliefs set at 550psig? all of this is well within the MAWP.. there will be 25psig higher drum pressure than the non return "check valve" for a header that runs 450psig....
