TACTICAL USE OF FIRE HYDRANTS.

That generally is true, about using a 35 ft. 5" feedline/supply line to the pumps, can give good water. The reason for the hard Suction is for Drafting or other situations where a negative pressure, such as low hydrant pressure at a major fire. or when the Engine Company tries to pump to too, many lines or large lines and the Intake Pressure falls below normal. The Hard Suction will not collapse under negative pressure. I have been are major fires in the summer when civilian opened too many hydrants for cooling purposes and the Hydrant Pressure drops. Undersized water mains supplying the Hydrant system can also cause low Intake Pressure. Captain Bob Rainey FDNY Engine 26 retired.
 
captaindewey50267021@gm said:
That generally is true, about using a 35 ft. 5" feedline/supply line to the pumps, can give good water. The reason for the hard Suction is for Drafting or other situations where a negative pressure, such as low hydrant pressure at a major fire. or when the Engine Company tries to pump to too, many lines or large lines and the Intake Pressure falls below normal. The Hard Suction will not collapse under negative pressure. I have been are major fires in the summer when civilian opened too many hydrants for cooling purposes and the Hydrant Pressure drops. Undersized water mains supplying the Hydrant system can also cause low Intake Pressure. Captain Bob Rainey FDNY Engine 26 retired.
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Don’t know if this is in the books for Engine operations or not but, I remember reading or hearing something that Engine companies responding on second alarm or greater could only use the hard suction when they hooked up to avoid exactly what you described.
 
That is a fact. I think it is still so, that FDNY Book of regulations Requires units arriving on 2nd or greater alarm, MUST us a 4 1/2" (Now Normally 5") ridged Hard Suction. I still think that the FDNY Book of Regulations states that the 1sd due Engine on the 1srt Alarm can use inline pumping if Necessary or 3 1/2" semi ridged connection or of cause the Hard Suction. All this is to prevent the Supply line or Suction Line form Collapsing if the Intake of the Engine Co. drops to a negative or close to negative due to low hydrant pressure, or the Engine trying to supply more outlets than the G.P.M. of the water Entering the pump. This can be a real problem anytime, but the situation is even greater when many units are taking water from, the same water mains at a major fire, or in the Summer when hydrants are illegally open by civilians. FDNY Engine Operations also states the same concepts as well as some FDNY All Unit Circulars. Captain Bob Rainey FDNY Engine 26 retired. FDNY Black Out July 1977 Thruxton St. 5-5.jpg
 
captaindewey50267021@gm said:
That is a fact. I think it is still so, that FDNY Book of regulations Requires units arriving on 2nd or greater alarm, MUST us a 4 1/2" (Now Normally 5") ridged Hard Suction. I still think that the FDNY Book of Regulations states that the 1sd due Engine on the 1srt Alarm can use inline pumping if Necessary or 3 1/2" semi ridged connection or of cause the Hard Suction. All this is to prevent the Supply line or Suction Line form Collapsing if the Intake of the Engine Co. drops to a negative or close to negative due to low hydrant pressure, or the Engine trying to supply more outlets than the G.P.M. of the water Entering the pump. This can be a real problem anytime, but the situation is even greater when many units are taking water from, the same water mains at a major fire, or in the Summer when hydrants are illegally open by civilians. FDNY Engine Operations also states the same concepts as well as some FDNY All Unit Circulars. Captain Bob Rainey FDNY Engine 26 retired. View attachment 48172
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Thank you !
 
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