Cast iron pipe can be used to carry steam at pressures up to what pressure (psig)?

Cast iron pipe is commonly used in various applications, including steam piping. It is recognized for its strength and durability, making it suitable for high-pressure environments. When it comes to steam applications, cast iron can typically carry steam at pressures up to 250 psig.

This pressure capacity is due to the inherent properties of cast iron, which can withstand the thermal expansion and contraction associated with steam systems. While certain codes and standards may limit the use of cast iron to more conservative pressure ratings depending on specific factors, the general consensus within industry publications clarifies that the maximum operational pressure for cast iron pipe in steam service is set at 250 psig.

In comparison, the pressures mentioned in the other options either exceed what is typically deemed safe for cast iron piping or are below the maximum limit established for its use in steam systems. Choosing 250 psig reflects knowledge of the material's specifications and aligns with accepted engineering practices in the pipefitting field.