How much is the water pump flange pressure rating

Flange is the main part of the water water pump and pipeline connection, flange application widely, connection between the pipe and equipment suit connect many of them use flange connection, flange material has a lot of kinds, how much is the pressure rating, common stainless steel flange, plastic flange; Flange pressure level is clear, Class300 flange can bear more pressure than Class150, because Class300 flange need more material to make, and can withstand greater pressure. However, flange compression capability is influenced by many factors. Flange pressure level by pound, a pressure level have different representations. For example: 150 lb, 150 LBS, 150 # and Class150 meaning is the same. According to ASME B16. 5, steel flange has seven classes: Class150 - 300 - 400 - 600 - 900 - 1500 - 2500 a, pressure level, for example, the temperature is different, flange bearing capacity is also different. Temperature rising, flange bearing capacity drops. Class150, for example, the flange bearing capacity at room temperature to 270 PSIG, confined ability in 400 ℉ to 180 PSIG, confined ability in 600 ℉ to 150 PSIG, at 800 ℉ bearing capacity is 75 PSIG. In other words, when the pressure drop, allowing the temperature rise, and vice versa. As a result of the flange can be made of different materials, such as stainless steel, cast iron, ductile iron, carbon steel, and so on, each kind of material has different pressure levels. NPS12 flange sample, you can see, the inner hole of the flange and the diameter is the same. But the central circle diameter of the flange diameter, bolt hole, bolt hole diameter and larger with the increase of stress level. The number and diameter of bolt holes are respectively: CL - 150 12 x 25。 4 CL 300 - 16 x 28。 6 CL 400 - 16 x 34。 9 CL 600 - 20 x 34。 9 CL 900 - 20 x 38。 1 CL 1500 - 16 x 54 CL 2500 - Second, the pressure temperature ratings - 12 x 73 For example pressure - Temperature rating is refers to the material and the rated temperature ( C) Allow the worksheet with high pressure (under Pressure unit for Bar) 。 For intermediate temperature, allowing the linear insertion method is adopted to define. But are not allowed to insert between flange level. If the flange joint bolts and gaskets in accordance with the relevant qualification, and find with flange joint assembly in line with the good discipline, is the flange joint can be applied to pressure Temperature rating. Like to use the latter does not meet the qualification of flange joint, shall be the responsibility of the user. Corresponding to the rated pressure rated temperature refers to the flanges and flanged fittings of the shell temperature of the pressure vessel. In general, the storage temperature and fluid at the same temperature. Don't press stored fluid temperature to choose pressure rating responsibility conceited by the user. When the temperature in - 29℃（ - - - - - - 20℉） Rating shall be no greater than - when the following 29℃（ - - - - - - 20℉） When rating. As an example, the following is according to ASTM divided two groups of materials and they shall, in accordance with the ASME B16. The pressure of 5 - Temperature rating. 1, shall not be used for more than 455 ℃. 2, shall not be used for more than 370 ℃. 3, shall not be used for more than 260 ℃. 4, shall not be used for more than 425 ℃.
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