What is the inherent problem in Composite Boiler?
There are different types of composite boilers. Normally one part of the boiler is heated by means of a fuel oil burner and the other part is heated by the exhaust gases from a diesel engine. Heating of one part of a boiler at the time often causes thermal stress that may lead to leakage. One single composite boiler does not fulfill normal requirement of redundancy when the steam is used for essential service purpose. ——————————————————————————– Question: Steam valves open causing a sudden large load I have two 82,000 lb/hr natural gas fired boiler that is designed for 300 psig and operating at 205 psig (saturated). The boilers serve a large campus with numerous buildings, each with an integrated building management control system. Due to an unresolvable characteristic of the building control system, occasionally all of the building steam valves open causing a sudden large load on the boilers that lasts for 20 to 30 minutes. The dema
