The piping for a dry chemical system is required to be hydrostatically tested.

The piping for a dry chemical system is required to be hydrostatically tested.

• A. True
• B. False
• C. Only if requested
• D. Not required

Answer: (B)

Dry chemical piping isn’t tested with a hydrostatic, water-filled pressure test. The lines in a dry chemical system carry dry powder and are not intended to be filled with water, because moisture can contaminate the powder and affect performance. Instead, the piping is typically pressure tested with air or another inert gas (a pneumatic leak test) to verify integrity before the system is charged and activated, in accordance with the installer’s procedures and applicable standards. Because hydrostatic testing uses water, which isn’t appropriate for this type of system, the requirement to perform a hydrostatic test on the piping is not applicable.

Dry chemical piping isn’t tested with a hydrostatic, water-filled pressure test. The lines in a dry chemical system carry dry powder and are not intended to be filled with water, because moisture can contaminate the powder and affect performance. Instead, the piping is typically pressure tested with air or another inert gas (a pneumatic leak test) to verify integrity before the system is charged and activated, in accordance with the installer’s procedures and applicable standards. Because hydrostatic testing uses water, which isn’t appropriate for this type of system, the requirement to perform a hydrostatic test on the piping is not applicable.