That is so you can trip the Valve without flooding the System, you would close those valves above the dry valve then trip the valve. Water would only go to that point. You see this application with pre action systems where they protect very expensive equipment and don’t want to flood the System when they are doing there 3-year full trip test

The main drain test, is a system's test. You cannot perform this test per floor

In Pennsylvania state

look online NICET training and certification. There is another certification program out there similar to NICET and it becoming widely accepted as the standard just like NICET. Can't remember the name of it, at this very moment.

Agreed. There is a pneumatic actuator on the priming line and he didn’t even mention it.

Interesting remark. is the water flow alarm supposed to be positioned before the drain? I thought that the inpector test connection was after the flow alarm, not the main drain.

@@cmarname The flow switches are located (in different areas) after the main drain. The main drain test is upstream of any flow switches. Typically, this should not trigger them. The inspectors test is located (usually near the end-of-the-line) at the end of the system. When the inspector's test is performed, a flow switch will detect flow, send a notification, and will trigger the alarm.

​@@paccbutler1826 I was flustered. It makes sense that the water comes upward and never hits the water flow switch so no alarm.

Agree.

Meant to say it states pre action

I think this one shows more specifically how that works kzfaq.info/get/bejne/jK55daqBy5a5aYk.html

In double interlock. If sprinkler brust water will not get into the piping network.. Actually it requires electric detection signal to open the solenoid valve. Than only the preaction valve will open.. Hope i am right. If i am wrong, please advise the correct operation.

The dry side has no flow switch. But it does have a pressure switch which will operate from flowing water from the test drain. This will ring the water motor alarm bell and activate the pressure switch to raise an alarm.

Dry Systems use a pressure switch in which you can test on the alarm line trim without tripping the system

Main drain below flow switch so no alarm

@@jaysonmengel2031 if the main drain pipe is located above the water flow switch, it WILL trigger the fire alarm.

Never put the fire pump out of service

simple answer: NO

@KZfaq Lover you always do the water supply test regardless if there is a data plate.

@KZfaq Lover Sometimes there isn't a hydraulic nameplate because it isn't required for certain systems.

Yes that’s correct. The air pressure in the field pipe is to monitor for any leaks. If you get a low air supervisory only the system will not trip, unless it’s coupled with a smoke/heat head to energize solenoid and dump the priming water. This is for coverage of areas you don’t want getting wet or having false trips at all costs. Once the air leak is detected the pipe can be repaired and you don’t damage any of the equipment that is being covered. If the system dumps on only one of these inputs alone it pretty much is defeating the purpose of the PreAc.

Hahahah he knows he will pop the valve if he opens it. Those things suck

actuall he does explained it in another small video.

Usually there is only 1 under ground Main that can feed several systems from a Manifold, Dry or Wet it doesn’t matter

Eric Corona jr that will depend on the type of hose valves. They might be using the flapping valves build in. But good observation

Great Point Bro!!