Dry chemical system tests are required to be conducted in a manner that does not expose the system to moisture that may cause corrosion. Which type of test is not permitted for pressure testing?

Dry chemical system tests are required to be conducted in a manner that does not expose the system to moisture that may cause corrosion. Which type of test is not permitted for pressure testing?

• A. Pneumatic test
• B. Hydrostatic test
• C. Hydraulic test
• D. Vacuum test

Answer: (B)

Moisture control is essential when testing dry chemical systems because the dry powder is sensitive to water. A hydrostatic test uses water to pressurize the piping, which bathes the system in moisture. That moisture can cause the dry chemical to cake, clump, or agglomerate, hindering flow and deployment, and it can also promote corrosion of metal components inside the system. For that reason, hydrostatic testing is not permitted for pressure testing of dry chemical systems. Alternative methods that avoid introducing moisture, such as pneumatic testing with air (or inert gas) and vacuum testing, are used to ensure the system stays dry and ready for service.

Moisture control is essential when testing dry chemical systems because the dry powder is sensitive to water. A hydrostatic test uses water to pressurize the piping, which bathes the system in moisture. That moisture can cause the dry chemical to cake, clump, or agglomerate, hindering flow and deployment, and it can also promote corrosion of metal components inside the system. For that reason, hydrostatic testing is not permitted for pressure testing of dry chemical systems. Alternative methods that avoid introducing moisture, such as pneumatic testing with air (or inert gas) and vacuum testing, are used to ensure the system stays dry and ready for service.