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a valve. The openings of this valve allow water to run into the waste, thereby releasing the automatic control. This in turn, drops the pressure in the line, which starts the pump, This test should be made daily at the opening of the theatre, so that you will know that the pumps are in operating condition.
We then continue across the line coming in from the siamese connection at the sidewalk. There is a check valve in this line so installed that no water will pass when you have pressure in this line. Next in line is what is known as a 7 lb. drip cock. This valve remains open at all times as there should be no pressure or water in the line between the check valve and the siamese connection. This drip cock allows for the drainage of any water that may leak into this section of piping, as any water in this section would freeze in the cold weather,
The siamese connection is provided so that the Fire Department can pump water into your standpipe line as an additional supply to the standpipe tank and fire pump, and as a replacement in case of failure of either of these services. When the fire pump starts pumping and the pressure builds up, the 7 1b. drip cock will close at 7 lbs. and allow water to enter the system.
From this point we go to the roof of the theatre where there is installed a 5,000 gallon tank. In the majority of our theatres, this tank is so arranged that 1,500 gallons provide domestic water to the theatre and 3,500 gallons are held in reserve at all times for our standpipe system.
Underneath this tank you will note there is a stop valve and then a check valve. This check valve is so installed that, when pumping either from the siamese connection or from’the:fire pump, this valve will remain closed so as to maintain pressure in the lines, remaining closed as long as there is 50 lbs. of pressure. If the pressure drops below 50 lbs. the check opens and allows the reserved water in the tank to flow into the line,
You will also observe a stop valve on each side of the check valve. This is provided so that the check valve can be repaired, if
He eePone ys There is also a drain from the tank which drains on to the roof.
After the check valve, the main line branches into the various sections of the building where you find hose racks with stop valves which, in case of fire, can be used and can be controlled individually. A pressure test is required at each hose connece tion showing the maintenance of 50 lb. pressure.
Kach tank is equipped with a telltale which consists of a float in the tank with high and low alarm attachments that ring a bell in the basement adjacent to the fire pump. When the tank is full, beyond the point required by law, the high alarm will ring. When the tank is below the level required by law, the low alarm will ring.