Hi,
there is and underground water tank for sprinkler system and it is horizontally ~20 m from pump room (technologically it is not possible to design it closer). Are there any restrictions about maximum distance from sprinkler suction pumps to water tank? What is the maximum horizontal distance allowed? What shall be evaluated in this design in order to avoid system failure.Any information would help a lot
Thank you!
It is below
If the tank's connection flange is at the same level or higher than the fire pump's suction flange, there's no maximum distance as long as the suction pipeline complies with NPFA 20 section 4.15.
The tank is below than the pumps are, but not more than 3.2 meters according to EN 12845. What are max horizontal distance requirement for underground water tank?
As per NFPA 20 is concerned, negative suction is not allowed for centrifugal pump.
Thank you, bus centrifugal pumps are not designed. The question is about the horizontal distance between pumps
What type of pumps will you use? How will you draw water from negative suction lift?
When water supply is below the fire pump your only choice is a vertical turbine pump, if compliance with NFPA is desired. Also if there's a vertical turbine pump, there's no need for a second pump in series unless it is a high rise building.
Correct, therefore if vertical turbine pump to be use. What is the maximum horizontal distance between tank and suction? I guess that is the question right?
So the answer would be zero. Since vertical turbine is directly above the underground tank and the only type of pump applicable for negative suction application.
Is the tank below the pump room?