MCC-NH Gas Fitters Practice Exam

If the pressure rises in a gas piping system, is a formula needed to prove to the inspector that the system is gastight?

1. Yes, always required by code

2. No, unless requested by the AHJ

3. Yes, for all types of installations

4. No, it is never required

The correct answer is: No, unless requested by the AHJ

The correct response is based on the understanding of local codes and the discretion of the Authority Having Jurisdiction (AHJ). Generally, if there is an increase in pressure within a gas piping system, it can indicate a potential issue, such as a leak or an installation flaw. The inspector may require verification that the system is gastight, but this requirement can vary depending on the specific codes in place and the practices adopted by the AHJ. Under typical circumstances, if the inspector specifies that proof of gastightness is necessary, a formula or a specific testing method might be required to demonstrate compliance with safety standards. However, if the inspector does not request this proof, then it is not obligatory to provide it. This makes it clear that while it’s good practice to be prepared with evidence of integrity in the system, the duty to provide it only arises if expressly requested by the AHJ, allowing some flexibility based on the situation and jurisdiction.