MCC-NH Gas Fitters Practice Exam

What is the maximum design operating pressure for any gas piping system?

1. 100 PSIg

2. 110 PSIg

3. 125 PSIg

4. 150 PSIg

The correct answer is: 125 PSIg

The maximum design operating pressure for any gas piping system is established by the industry standards and safety codes that govern the installation and operation of gas systems. In this context, the correct choice of 125 PSIg represents a common maximum design pressure for gas piping systems, which provides a balance between safety and the ability to transport gas efficiently. This pressure level, 125 PSIg, is typically used in many applications and is specified in various codes, including the National Fuel Gas Code (NFPA 54) and ANSI Z223.1, which help ensure that the gas systems can operate safely under normal and anticipated operating conditions while minimizing risks of failure or accidents. The other options, while they may be relevant in specific contexts or types of systems, do not universally apply as the established maximum design operating pressure for gas piping systems, making the choice of 125 PSIg the most appropriate and widely accepted standard.