Supplying a 200ft structure with water. Single pump or boosters or ?
Supplying a 200ft structure with water. Single pump or boosters or ?
(OP)
Theoretically I am needing to get water to the top of a ~200ft structure while also supplying two units along the way. The top of the structure will just need to be able to supply water when needed for general use and occasionally hooking up a pressure washer (40psi, 3gpm typical?). The water at the top will only need to be used every few weeks. However, I also need to supply a 10gpm unit 70ft up the structure and two more 10gpm units 120ft up the structure. These units will need water flow at all times.
If I have single pump that can meet the whole systems demands, will it deadhead the pump since the top of the structure will not have flow? Should I use a VFD for when we need water at the top and just meet the demands of the units for the majority of the time? I also am not sure if break tanks and boosters should be used in this scenario. Just wanting to know how some of you would approach this problem.
Thanks
If I have single pump that can meet the whole systems demands, will it deadhead the pump since the top of the structure will not have flow? Should I use a VFD for when we need water at the top and just meet the demands of the units for the majority of the time? I also am not sure if break tanks and boosters should be used in this scenario. Just wanting to know how some of you would approach this problem.
Thanks





RE: Supplying a 200ft structure with water. Single pump or boosters or ?
What is incoming water pressure?
Can you mount intermediate tanks on the structure?
What are pressure requirements / limitations on the intermediate water users?
If these users at intermediate levels are continuous, I think you're better off with three pump units specifically aiming to get highest efficiency possible. Trying to get this level of difference efficiently is too difficult. When you work out operating costs it makes sense to do it this way for continuous applications.
if the pressures and structure allow then I would go for a buffer tank somewhere above 120ft to feed the other users by gravity and then use a small booster pump from the tank to service the occasional user on the top. You can size the pump for the just above the continuous flow and control on level in the tank.
You want to avoid putting energy (pressure) or lifting it high and then loosing that energy by throttling it on a continuous basis
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Supplying a 200ft structure with water. Single pump or boosters or ?
Using a storage tank you can size it and set the on / off pump / tank levels to suit demand with the pump only required to fill the o/head tank, no need for VFD of fancy control systems .
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Supplying a 200ft structure with water. Single pump or boosters or ?
Too many unknowns at present.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Supplying a 200ft structure with water. Single pump or boosters or ?
Pressure reducing valve/s will take care of the lower levels.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Supplying a 200ft structure with water. Single pump or boosters or ?
As said - not enough detail to know which or what is best for this location - 3 separate pumps and no tanks, 1 pump and 3 tanks or anything in between....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Supplying a 200ft structure with water. Single pump or boosters or ?
Best bet is to contract out the problem to a company specialising in high-rise water reticulation systems -- probably been done 100's of times.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Supplying a 200ft structure with water. Single pump or boosters or ?
Food for thought for the OP.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)