The schedule for tightness testing of American-style suction piping is best described as what interval?

• A. Monthly
• B. Every three years
• C. Every year
• D. Every five years

Answer: (B)

Regular tightness testing intervals for suction piping are about balancing the risk of leaks against maintenance cost and downtime. For American-style suction piping, the common practice is to conduct tightness tests every three years. This interval reflects a judgment that, under typical operating conditions and with proper materials and installation, the chance of a developing leak significant enough to cause harm or shutdown is low enough to justify a longer interval, while still providing a reasonable mechanism to detect issues before they escalate. The test itself usually involves pressurizing the piping to a specified level, holding it for a set duration, and checking for any pressure drop or leakage—if the system passes, it reinforces that it’s performing as designed; if not, corrective actions are taken and the interval can be shortened. Shorter intervals, like monthly or yearly, would add unnecessary maintenance burden, while a five-year span could miss developing problems.