How to convert PSI and MPa pressure units in pipe fittings?

1.What are PSI and MPa?

1).PSI is a unit of pressure, defined as pounds per square inch, 145psi=1MPa, and the full English name of PSI is Pound sper square inch. Countries such as Europe and the United States are accustomed to using psi as a unit.

2).MPa is the unit used to express pressure. The term pressure is used in physics to refer to the amount of pressure expressed perpendicular to an object. The English name of pressure is Pressure Unit.

2.PSI and MPa conversion 1bar=1ATM=1kg/square centimeter=100KPa=0.1MPa 1ATM=14.696PSI

3.Pressure system of valves and pipe fittings

1).One is the "nominal pressure" system represented by Germany, which is based on the allowable working pressure at normal temperature (100 degrees in China and 120 degrees in Germany).

2).One is the "temperature and pressure system" represented by the United States, which is represented by the allowable working pressure at a certain temperature. In the temperature and pressure system of the United States, except for 150LB, which is based on 260 degrees, other levels are based on 454 degrees. .

3).The allowable stress of a 150-pound grade (150psi=1MPa) No. 25 carbon steel valve at 260 degrees is 1MPa, while the allowable stress at normal temperature is much greater than 1MPa, about 2.0MPa. Therefore, generally speaking, the nominal pressure level corresponding to the American standard 150LB is 2.0MPa, the nominal pressure level corresponding to the 300LB is 5.0MPa, and so on.

4).In American standard 150LB,2.0MPa＝20ATM＝293.92PSI (the working pressure of jianzhi brand pipe fittings is 363PSI, which meets the standard of American standard 150LB)

5).In American standard 300LB,5.0MPa＝50ATM＝734.8PSI

4.Pressure conversion table Please see the attached picture, you can save it and use it when converting.

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