Who knows that 150 Lb = MPa?

150LB is 2MPA, unit conversion between imperial and metric systems

Please refer to the instructions below regarding how to make the conversion; there’s no need to repeat that. Is there any information available on how many that is in terms of 300 Lb? I hope for a detailed explanation

Abroad, the design pressure is set at 150 LB at a design temperature of 350 degrees. The pressure rating in China is determined at a design temperature of 20 degrees. In this case, flanges and valves with a pressure rating of 150LB abroad are equivalent to those with a PN2.0MPa rating in China. You can’t directly use unit conversions.

The conversion relationship between nominal pressure and pounds (LB): MPa 1.6-2.0, 2.5-5.0, 6.3, 10.0, 13.0, 15.0, 25.0, 42.0; MPa classes: 150, 300, 400, 600, 800, 900, 1500, 2500; LB. PN and Class are both methods used to express pressure; the difference lies in the reference temperature at which the corresponding pressures are defined. The PN system used in Europe refers to pressures at 120°C, whereas the Class system used in the United States refers to pressures at 425.5°C. Therefore, in engineering conversions, it is not sufficient to simply perform pressure conversions; for example, the pressure corresponding to Class 300# based on mere pressure conversion would be 2.1 MPa. However, when the operating temperature is taken into account, the corresponding pressure increases, and according to the material’s temperature resistance tests, it is equivalent to 5.0 MPa. There are two systems for valves: one is the \"nominal pressure\" system, represented by Germany (including China), which is based on the allowable operating pressure at normal temperatures (100 degrees in China and 120 degrees in Germany). One is the “temperature-pressure system” represented by the United States, which is based on the allowable operating pressure at a certain temperature. In the temperature and pressure system of the United States, with 150LB based on 260 degrees, all other levels are based on 454 degrees. For a 25-grade carbon steel valve rated at 150 pounds per square inch (150 psi = 1 MPa), the allowable stress at 260 degrees is 1 MPa; whereas at room temperature, the allowable stress is much higher, around 2.0 MPa. Therefore, generally speaking, the nominal pressure rating corresponding to US standard 150LB is 2.0 MPa, while that corresponding to 300LB is 5.0 MPa, and so on. Therefore, the nominal pressure and temperature-pressure class cannot be arbitrarily changed using pressure conversion formulas.

1.5MPA is 150LB, 5.0MPA is 300LB

I have studied it in depth. I was wondering if the moderator could send me some relevant materials? lbzhayh@126.com

Generally, this notation is used for American-style flanges. The unit “Lb” used for American-style flanges is similar to kilograms; when we talk about kilograms, we actually mean kgf/cm2. In the case of American standards, “Lb” refers to pounds-force, that is, Lb/in2. The latter unit represents pressure, measured in Psi. In this case, 1 Psi = 0.07 kgf/cm2, which means that 150 Lb = 10 kgf/cm2. 1 lb = 0.4356 kg = 4.45 N. 1 in = 0.0254 m, and 1 in^2 = 6.45x10^(-4) m^2. Therefore, 1 LB = 4.45/6.45x10^(-4) = 6899 N/m^2 = 6899 Pa. 150 LB = 150(6899) = 1.035x10^6 Pa = 1.035 MPa. Thus, 150 LB = 1 MPa

150LB is the nominal pressure pipeline class, approximately 2MPA

Conversion between US Standard Class pressure ratings and MPa ratings http://bbs.hcbbs.com/viewthread.php?tid=677959&highlight=%BB%BB%CB%E3

The team on the 5th floor is truly professional; this issue has been bothering me for a long time as I couldn’t figure out the relationship between various elements. Thank you so much today