Are all boiler tubes operating at the same pressure?
Boiler tubes are classified according to pressure, which can be mainly divided into high pressure boiler tubes, medium pressure boiler tubes and low (medium) pressure boiler tubes. The following is a detailed classification and description of all types of boiler tubes:
First, high-pressure boiler tube
High-pressure boiler tubes usually refer to seamless steel tubes for boilers with working pressure above 9.8MPa. This kind of steel pipe needs to withstand the action of high temperature and high pressure steam, so the material and performance requirements are extremely high. Its execution standard is generally GB/T5310-2018.
The working ambient temperature of the high-pressure boiler tube is usually between 450 ° C and 650 ° C, and it needs to have good high temperature resistance, high pressure resistance and corrosion resistance.
Second, medium pressure boiler tube
The working pressure range of the boiler tube is generally between 3.8MPa and 9.8MPa. Although its working pressure is lower than that of high-pressure boiler tubes, it still needs to have good performance to meet the needs of boiler operation.
The working temperature of the medium pressure boiler tube is usually lower than that of the high pressure boiler tube, but it also needs to withstand certain temperature and pressure changes.
Three, low (medium) pressure boiler tube
The working pressure of low (medium) pressure boiler tube is generally not more than 5.88MPa (it is also said that the pressure range of medium pressure boiler is 2.94MPa to 4.90MPa, but the current parameter series of Chinese power station boiler outlet steam pressure is stipulated as 3.83MPa, Therefore, no more than 5.88MPa is used here as the upper pressure limit of the low and medium pressure boiler tube). This kind of steel pipe is mainly used in low-pressure boilers and similar pressure vessels.
The operating temperature of low (medium) pressure boiler tubes is usually low, below 450 ° C.
