Most commonly low pressure boilers are used for comfort heating, humidification, and for some lower temperature process applications.
Steam boiler technology is used for a wide range of applications. Low pressure steam boilers are limited to 15 psig design, and are commonly used for heating applications. High pressure boilers are most often used for process loads and capable of operating pressures ranging from 16 psig to more than 1,000 psig. Steam boiler systems typically require saturated steam, which means the water and the steam in the vessel must be at the same temperature.
In a low pressure boiler the pressure does not exceed 15 psi and the temperature will not rise above 250 degrees F. Low pressure steam boilers do not need to be monitored regularly and usually only have to be checked when they begin to break down.
Low Pressure Steam Boilers and Heating Load
Since low pressure steam boilers are typically used to maintain building heat, heating load is an important factor. A low pressure steam heating load does not involve a lot of instantaneous change to the load, but large seasonal variations are taken into consideration. The boiler should be sized to accommodate the worst foreseeable weather conditions while keeping in mind that the extreme conditions are rarely reached. Extreme inefficiency can result from excessive cycling if the boiler is oversized boiler relative to load. All too often, boilers operate at loads that are a fraction of their rated capacity for the majority of the time they are in use. In order to prevent excessive cycling and fuel loss, the sizing and selection of the boiler should take seasonal variations into consideration.
Low Pressure Steam Boiler Applications
Low pressure steam boilers are often used in buildings and designed to supply heat to individual rooms through radiators. Buildings heated by low pressure steam boilers may include restaurants, hospitals, office buildings, and schools. These boilers can be used to heat the water supplied to bathrooms and the steam is used to supply heat throughout the building.
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