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The ASME Boiler & Pressure Vessel Code (BPVC) is an American Society of Mechanical Engineers (ASME) standard that regulates the design and construction of boilers and pressure vessels. [1] The document is written and maintained by volunteers chosen for their technical expertise . [ 2 ]
A minimum return water temperature of 130 °F (54 °C) to 150 °F (66 °C) to the boiler, depending on the specific design, is used to avoid condensing water vapor from the flue gas and dissolving CO 2 and SO 2 from the flue gasses forming carbonic and sulfuric acid, a corrosive fluid that damages the heat exchanger. [10]
The lower the return temperature to the boiler the more likely it will be in condensing mode. If the return temperature is kept below approximately 55 °C (131 °F), the boiler should still be in condensing mode making low temperature applications such as radiant floors and even old cast iron radiators a good match for the technology.
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Fairfield-Johnson boiler: a later form of Johnson boiler operating at lower pressure (450 psi [31 bar; 3,100 kPa] rather than 850 psi [59 bar; 5,900 kPa]), but still a high superheat temperature 825 °F (441 °C). [4] Fairlie boiler: A double-ended locomotive boiler with a central firebox, used in Fairlie's patent for double-ended articulated ...
A boiler incorporates a firebox or furnace in order to burn the fuel and generate heat. The generated heat is transferred to water to make steam, the process of boiling. This produces saturated steam at a rate which can vary according to the pressure above the boiling water. The higher the furnace temperature, the faster the steam production.
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