Main Drain Inspections Included with Fire Suppression System Inspection Services
Main drain inspections are limited to main drain flow only. This is a limited inspection that is included as part of all Annual, Quarterly, and Riser inspections.
Usually, the only time there is a request for a main drain inspection (and ONLY a main drain inspection) would come from your insurance provider. In this case, the inspector wants to verify that the main water supply from the street is not blocked or compromised. The main drain test evaluates the condition of the water supply to a fire sprinkler system and also ensures that the water supply valve is fully open. Any deterioration or change in the water supply is noted by comparing test results to previous test results.
While this is an important test, it cannot be considered a sprinkler system inspection, nor take the place of a full fire system suppression inspection. The local Fire Marshal will not accept it as such.