When is the initial pressure test conducted by the installer?

The correct choice highlights a critical step in ensuring the safe and reliable operation of medical gas systems. The initial pressure test is conducted after the blowdown of the distribution piping because this step is essential for verifying the integrity of the piping system before it goes into service.

Blowdown involves the removal of debris, moisture, or any contaminants that could interfere with the safe operation of the medical gas system. Once this cleaning process is completed, conducting the pressure test allows the installer to check for leaks and ensure that the system can maintain the necessary pressure levels without any drops due to faults in the installation. This test is vital for compliance with safety standards and regulations, ensuring that the system is safe for use in a medical environment where reliability is paramount.

Performing the pressure test after the blowdown ensures that any potential issues can be identified and rectified before the system is put into operation, effectively safeguarding patient care and the functionality of medical gas systems.