For piping systems over 1,000,000 BTU input, the testing duration is not to exceed how many hours?

For piping systems over 1,000,000 BTU input, the testing duration is not to exceed how many hours?

• A. 8 hours
• B. 12 hours
• C. 24 hours
• D. 48 hours

Answer: (C)

When testing large gas piping, the duration is set to give enough time to reveal leaks under the test pressure while keeping the work practical in the field. For piping systems with input over 1,000,000 BTU, the allowable testing time is 24 hours. This duration balances the need to observe pressure stability and potential slow leaks with the reality of job-site constraints. If the system maintains pressure for the full 24 hours with no leaks, it passes; any drop in pressure or visible leak requires repairs and a retest. Shorter times (8 or 12 hours) may not be sufficient to detect slow leaks in large networks, while a 48-hour test would exceed the standard limit for this size of system.

When testing large gas piping, the duration is set to give enough time to reveal leaks under the test pressure while keeping the work practical in the field. For piping systems with input over 1,000,000 BTU, the allowable testing time is 24 hours. This duration balances the need to observe pressure stability and potential slow leaks with the reality of job-site constraints. If the system maintains pressure for the full 24 hours with no leaks, it passes; any drop in pressure or visible leak requires repairs and a retest. Shorter times (8 or 12 hours) may not be sufficient to detect slow leaks in large networks, while a 48-hour test would exceed the standard limit for this size of system.