The US standard issue for LB
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In ANSI standards, the issue of LB is often mentioned to indicate the pressure rating. Are there any relevant standard specifications in China regarding this? What are the standards for converting LB to PN? ? Thank you! !
I’m not sure if there are any relevant standards, but the correspondence between pound ratings and nominal pressures should be easy to find. Corresponding grades under the HG standard for the American system: PN2.0MPa(150lb), PN5.0MPa(300lb), PN11.0MPa(600lb), PN15.0MPa(900lb), PN26.0MPa(1500lb), PN42.0MPa(2500lb). Corresponding grades under the SH standard: PN2.0MPa(150lb), PN5.0MPa(300lb), PN6.8MPa(400lb), PN10.0MPa(600lb), PN15.0MPa(900lb), PN25.0MPa(1500lb), PN42.0MPa(2500lb)
For valves, the pressure class is determined according to ASME B16.34; different materials have various pressure classes. The pressure class represents a graph or table showing the temperature and pressure characteristics of a particular material. PN refers to the nominal pressure, which provides only a rough specification for the pressure or pressure resistance capacity. It does not involve material or temperature. Typically, the conversion from CL to PN involves replacing the material with ordinary carbon steel or carbon steel, at room temperature. Without these two conditions, conversion cannot be carried out arbitrarily. At room temperature, copper valves with a capacity of 600 cl and steel valves with the same capacity clearly have different PN values.