What is the minimum requirement for unions in concealed locations within gas piping systems?

• A. Must be utilized freely
• B. Must not be installed
• C. Can be installed with limitations
• D. Must be approved by a licensed inspector

Answer: (A)

The minimum requirement for unions in concealed locations within gas piping systems is that they must be utilized freely. This indicates that unions, which are fittings used to connect sections of pipe, should be allowed in concealed areas to ensure that parts of the gas piping system can be easily joined or removed when necessary. Allowing for the free use of unions facilitates maintenance and repair work without needing to access areas that may be difficult to reach.

Alternatives like not allowing unions or restricting their installation could create barriers to necessary maintenance and repair, which could pose safety risks and complicate system functionality. Approval by a licensed inspector might be a standard practice in some instances, but it is not the primary requirement regarding their use in concealed locations. Therefore, the focus is on the accessibility and functionality of the unions rather than prohibiting them or placing stringent limitations on their use.