What is the maximum working pressure for black iron pipe?

The maximum working pressure for black iron pipe, typically used for gas and water lines, is indeed recognized as 125 psi. This standard is based on the pipe's ability to withstand pressure without risking structural failure or leakage under normal operating conditions.

Black iron pipe is commonly utilized in heating and gas systems due to its strength and durability. The pressure rating of 125 psi provides a safe operating limit for most residential and commercial applications, ensuring that the pipe can handle the typical pressures encountered without compromising safety. This rating serves as a guideline for installers to ensure that the systems they create comply with safety standards and operate effectively without failures.

It's important to note that while black iron pipe can be rated for higher pressures in certain contexts, the general maximum working pressure used in gas and heating applications is capped at 125 psi in order to maintain safety and integrity of the system. Understanding this limit is crucial for professionals in the field when designing and installing piping systems.