limits to be set on low pressures steam boilers?
You really need to read the ASME code and any modifications added by the local area where the boiler in question exists. ASME low pressure boilers for heating have a H stamp on their code nameplate.
Low pressure steam boilers are those rated not more than15psig. These low pressure steam boilers are commonly used in hotels, restaurants and hospitals. These boilers should have pressure switches which trips the power supply at 15 psi. Also these boilers should have at least two mechanical relief valves which will release steam automatically once the set pressure is reached. For safety however,one should conduct a hydrostatic pressure test during a shutdown,of at least 200 % of the boiler operating rating and check if the shell does not give way.
