Prior to acceptance testing, the piping of a dry chemical system must be checked for which condition?

• A. Flow rate
• B. Thermal stability
• C. Tightness
• D. Electrical continuity

Answer: (C)

The main idea is ensuring the piping is leak-tight. Before acceptance testing, the piping must be checked to make sure there are no leaks under the service pressure, with joints, valves, and connections securely sealed. This tightness check guarantees the system will hold the dry chemical and maintain the proper pressure when it’s activated, preventing powder loss or contamination and ensuring reliable operation.

Flow rate isn’t the focus of this initial check—it's a performance parameter assessed during or after commissioning. Thermal stability isn’t about whether the piping holds pressure, and electrical continuity relates to wiring rather than the piping itself.