Pressure Rating Lb to Kilogram and MPa Conversion Table
In the field of valves and pipe fittings, the pressure unit rating Lb originates from American standards. With the increase in international engineering cooperation, domestic projects also often encounter designations such as 150Lb, 300Lb, 600Lb. For convenient selection, it is necessary to convert them to the commonly used domestic units kilogram and MPa.
Rating Lb to MPa and PN Comparison Table
The table below lists the nominal pressure MPa and PN levels corresponding to common rating pressures, which can be directly used for valve or pipe fitting selection.
| Rating Pressure Class | Corresponding Nominal Pressure MPa | Corresponding Pressure Level PN |
|---|---|---|
| 150Lb | 2.0 MPa | PN20 |
| 300Lb | 5.0 MPa | PN50 |
| 400Lb | 6.4 MPa | PN64 |
| 600Lb | 10.0 MPa | PN100 |
| 800Lb | 13.0 MPa | PN130 |
| 900Lb | 15.0 MPa | PN150 |
| 1500Lb | 25.0 MPa | PN250 |
| 2500Lb | 42.0 MPa | PN420 |
Quick Conversion Rules
In addition to looking up the table, the MPa value can also be estimated by simple division. The specific rules are as follows:
- 150Lb series: Divide the rating number by 75, for example, 150Lb ÷ 75 = 2.0 MPa.
- 300Lb series: Divide the rating number by 60, for example, 600Lb ÷ 60 = 10.0 MPa.
Note: The above rules are approximate conversions. Actual selection should be based on standard specifications or manufacturer data.
Selection Precautions
- Confirm the working pressure and temperature of the medium, and avoid selecting solely based on the rating.
- Check the correspondence between the nominal pressure PN and the rating Class of the valve or pipe fitting.
- Different standards (such as ASME B16.34 and GB) may have differences and require cross-verification.
Mastering the above conversion table and rules allows for quickly converting rating pressure to commonly used domestic MPa or kilograms, improving engineering selection efficiency.