Qiyansun
New Member
The attached shows my fire sprinkler system and the plumbing for the house. When I open the hose bib below or any faucet inside the house, the needle of the pressure gauge attached to the fire sprinkler system bounces and thundering noises from the ceiling. If I open the hose bib slowly, I don’t hear the noise and the pressure gauge needle moves from 65psi to 60psi gradually. Is this a water hammer inside the fire sprinkler system? Does the pressure change inside the fire sprinkler system indicates the check valve is bad?