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2022

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06

How to convert PSI and MPa pressure units?

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PSI and MPa conversion, psi is a unit of pressure, defined as pounds per square inch, 145psi = 1MPa, PSI English full name Poundspersquareinch. P is pound, S is square square, and I is inch. Replace all the units with metric units to calculate: 1bar≈14.5psi, 1psi=6.895kPa=0.06895bar Europe and the United States and other countries are accustomed to using psi as a unit.

In China, we generally describe the pressure of the gas in "kilograms" (not "kilograms"), the body unit is "kg/cm^2", and the pressure of one kilogram is the force of one kilogram acting on a square centimeter.

The commonly used unit in foreign countries is "Psi", the specific unit is "lb/in2", that is, "pounds per square inch", this unit is like the Fahrenheit temperature scale (F).

In addition, there are pressure units such as Pa (Pascal, one Newton acting on one square meter), KPa, Mpa, Bar, millimeter water column, millimeter mercury, etc.     

1 bar = 0.1 MPa (MPa) = 100 kilopascals (KPa) = 1.0197 kg/cm²

1 standard atmospheric pressure (ATM) = 0.101325 MPa (MPa) = 1.0333 bar (bar)

Because the difference in units is very small, you can remember it like this:

    1 bar = 1 standard atmospheric pressure (ATM) = 1 kg/cm² = 100 kPa (KPa) = 0.1 MPa

The PSI conversion is as follows:

    1 standard atm = 14.696 psi

Pressure conversion relationship:

   

Pressure 1 bar = 10^5 Pa (Pa) 1 dyne/cm2 (dyn/cm2) = 0.1 Pa (Pa)

1 torr = 133.322 Pa (Pa) 1 millimeter Hg (mmHg) = 133.322 Pa (Pa)

1 mm water column (mmH2O) = 9.80665 Pa (Pa)

1 engineering atmospheric pressure = 98.0665 kPa (kPa)

1 kilopascal (kPa) = 0.145 pound-force/in2 (psi) = 0.0102 kilogram-force/cm2 (kgf/cm2) = 0.0098 atm

1 pound force/in2 (psi) = 6.895 kilopascals (kPa) = 0.0703 kilogram forces/cm2 (kg/cm2) = 0.0689 bar (bar) = 0.068 atm

1 physical atmospheric pressure (atm) = 101.325 kilopascals (kPa) = 14.696 pounds/in2 (psi) = 1.0333 bar (bar)

There are two types of valve systems: one is the "nominal pressure" system represented by Germany (including China) based on the allowable working pressure at room temperature (100 degrees in China and 120 degrees in Germany). One is the "temperature pressure system" represented by the allowable working pressure at a certain temperature represented by the United States

In the U.S. temperature and pressure system, except for 150LB, which is based on 260 degrees, all other levels are based on 454 degrees.

The allowable stress of the 150-pound (150psi=1MPa) No. 25 carbon steel valve is 1MPa at 260 degrees, and the allowable stress at room temperature is much greater than 1MPa, about 2.0MPa.

Therefore, it is generally said that the nominal pressure level corresponding to the American standard 150LB is 2.0MPa, and the nominal pressure level corresponding to 300LB is 5.0MPa, and so on.

Therefore, the nominal pressure and temperature pressure level cannot be changed casually according to the pressure transformation formula

PSI to MPa pressure conversion table

PSI and MPa conversion, psi is a unit of pressure, defined as pounds per square inch, 145psi = 1MPa, PSI English full name Poundspersquareinch. P is pound, S is square square, and I is inch. Replace all the units with metric units to calculate: 1bar≈14.5psi, 1psi=6.895kPa=0.06895bar Europe and the United States and other countries are accustomed to using psi as a unit.

In China, we generally describe the pressure of the gas in "kilograms" (not "kilograms"), the body unit is "kg/cm^2", and the pressure of one kilogram is the force of one kilogram acting on a square centimeter.

The commonly used unit in foreign countries is "Psi", the specific unit is "lb/in2", that is, "pounds per square inch", this unit is like the Fahrenheit temperature scale (F).

In addition, there are pressure units such as Pa (Pascal, one Newton acting on one square meter), KPa, Mpa, Bar, millimeter water column, millimeter mercury, etc.

   

 1 bar = 0.1 MPa (MPa) = 100 kilopascals (KPa) = 1.0197 kg/cm²

1 standard atmospheric pressure (ATM) = 0.101325 MPa (MPa) = 1.0333 bar (bar)

Because the difference in units is very small, you can remember it like this:

     1 bar = 1 standard atmospheric pressure (ATM) = 1 kg/cm² = 100 kPa (KPa) = 0.1 MPa

The PSI conversion is as follows:

     1 standard atm = 14.696 psi

Pressure conversion relationship:

   

 Pressure 1 bar = 10^5 Pa (Pa) 1 dyne/cm2 (dyn/cm2) = 0.1 Pa (Pa)

1 torr = 133.322 Pa (Pa) 1 millimeter Hg (mmHg) = 133.322 Pa (Pa)

1 mm water column (mmH2O) = 9.80665 Pa (Pa)

1 engineering atmospheric pressure = 98.0665 kPa (kPa)

1 kilopascal (kPa) = 0.145 pound-force/in2 (psi) = 0.0102 kilogram-force/cm2 (kgf/cm2) = 0.0098 atm

1 pound force/in2 (psi) = 6.895 kilopascals (kPa) = 0.0703 kilogram forces/cm2 (kg/cm2) = 0.0689 bar (bar) = 0.068 atm

1 physical atmospheric pressure (atm) = 101.325 kilopascals (kPa) = 14.696 pounds/in2 (psi) = 1.0333 bar (bar)

There are two types of valve systems: one is the "nominal pressure" system represented by Germany (including China) based on the allowable working pressure at room temperature (100 degrees in China and 120 degrees in Germany). One is the "temperature pressure system" represented by the allowable working pressure at a certain temperature represented by the United States

In the U.S. temperature and pressure system, except for 150LB, which is based on 260 degrees, all other levels are based on 454 degrees.

The allowable stress of the 150-pound (150psi=1MPa) No. 25 carbon steel valve is 1MPa at 260 degrees, and the allowable stress at room temperature is much greater than 1MPa, about 2.0MPa.

Therefore, it is generally said that the nominal pressure level corresponding to the American standard 150LB is 2.0MPa, and the nominal pressure level corresponding to 300LB is 5.0MPa, and so on.

Therefore, the nominal pressure and temperature pressure level cannot be changed casually according to the pressure transformation formula

PSI to MPa pressure conversion table

 

PSI,MPa