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.
 
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