What is the correct way to test a 13D system?
Please see NFPA 13 D Chapters 11 and 12 for the answer to your question. Just my opinion. Hope this is helpful.
As above, from the Automatic Sprinkler Systems for Residential Occupancies Handbook - Chapter 12
When an FDC is not provided, residential sprinkler systems are still required to undergo a hydrostatic test, but the test can be conducted at the pressure the system would normally experience, rather than the higher pressure that would normally be associated with use of an FDC. The test is conducted by opening the system control valve once the system installation is completed and filling the system with water from the water supply at whatever pressure is available from the water supply. If leakage is to be determined by a drop in pressureat a gauge, the water control valve should be temporarily closed to isolate the water supplypressure. The system should be checked for leaks to verify that the piping connections are installed correctly. This process is consistent with the means by which plumbing systems are checked. It is recommended that this test be conducted prior to concealing the piping so that any problems can be detected and repaired without damaging or replacing walls or ceilings.
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