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Uniform pressure thoroughout ANY piping system is only possible if the velocity is ZERO. Under any other flow conditions, there will be variations in pressure; between user and first storage tank; between first storage tank and second storage tank; etc., etc. It's just like one of those "Balancing Reservoirs" excercises from Venard's: "Fluid Mechanics and Hydraulics"

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You'll have to forgive me, I'm not an engineer, I'm just an old guy that works on well water systems with a fair troubleshooting and mechanical hands on ability.

Actually, the velocity IS ZERO before he opens a tap, and the switch and guage at the pumps will show/sense the pressure drop as the water exits the tap, unless there are check valves on the line from each pump to the tee tying the two tanks system together. Then the pump with the shortest distance should see it first.

Yes he will have a dynamic pressure loss due to the friction loss in the line and any fittings and dynamic pressure is different and less than static pressure but again, the switch and guage on/at each pump will see EITHER type pressure decrease with the tap opened. I'm sure you will agree with that or we'd be talking about how to get the pumps to run when needed...

Also, I see him using a submersible pump in the tanks OR a jet or centrifical pump outside the tanks with flooded suction. For general discussion purposes (again), the pumps are going to pressurize the system, not the water in the tanks. The switch and guage will be outside the tank and on the service side of the system, not on the tank side.

Additionally, his system is far from being "balanced" because of hundreds of feet of 2" pipe! And I can see many service line joints at least every 20' if the system is using anything other than PE tubing. AND he says there are various valves tying the two tank system together.

Also recall that as yet we don't know of any elevation variance between the tanks. Nor do we know if there are any check valves in the system; which certainly cause an imbalanced system between these two tanks. So IMO a "balanced" system is out and there is no possible way to balance it as designed and supposedly already installed plumbing.

BTW, because Cycle Stop Valves provide constant pressure (controlled at the pump outlet), I'm fairly sure that Cycle Stop Valves would tend to balance flow and user end pressure. And that goes to the original subject/question "2 Booster Pumps, Same mainline". One pump, the one with the longest line to the mainline, will have to be larger in GPM and possibly hp, than the other UNLESS or UNTIL we plug in a negative elevation to the tee to the mainline. Is that right or wrong?

Gary Slusser

Gary Slusser
Quality Water Associates

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My railroad experience was in the mid 60's and used on the passenger train dining cars. The cabooses still had coal fired stoves in them then.

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I guess the railroads were going downhill then up there, as they were here. Until March '64 when I joined the police department, I was working registered mail at the post office and used to take it out to the RPO car (railroad post office) on all the passenger trains going through Dallas. A lot of the really valuable mail had to be transferred from one individual to another, and signed for each time. Although we usually never knew exactly what was in a sack or package, there were codes for different value amounts. I remember once taking new, freshly printed cash off a train once that was going to the Federal Reserve Bank; don't know the exact amount, but the codes indicated a minimum of $8 million. But by '64, the passenger cars were getting in bad shape and carried very few passengers.

Of course my grandfather hauled the mail between the post office and the train station in Ardmore, OK, from 1943 until trains no longer carried mail, so when I was a kid I used to ride with him when the trains were still steam engines.

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