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Started By
Message
Engineer Math Question. Pump and flow related
Posted on 12/9/20 at 6:11 pm
Posted on 12/9/20 at 6:11 pm
Im looking for the longest run of suction pipe either 1" or 1&1/4" for my well pump.
Pump is a 1hp 24.5 gpm shallow well jet pump with a 1&1/4" inlet. Pump specs says it has 25' of suction lift. I would imagine I would only have around 15' max
Im looking for the longest possible run I can have with either line size before I would encounter cavitation issues. The well head is roughly 350' away from house and I would like to have pump placed near the house if at all possible.
Pump is a 1hp 24.5 gpm shallow well jet pump with a 1&1/4" inlet. Pump specs says it has 25' of suction lift. I would imagine I would only have around 15' max
Im looking for the longest possible run I can have with either line size before I would encounter cavitation issues. The well head is roughly 350' away from house and I would like to have pump placed near the house if at all possible.
27
Posted on 12/9/20 at 6:12 pm to geauxcats10
:bout350OTgif:
Posted on 12/9/20 at 6:14 pm to geauxcats10
288 or -1
Depends on your order of operations
This is like engineering 101...you don’t sound very good at your job
Depends on your order of operations
This is like engineering 101...you don’t sound very good at your job
This post was edited on 12/9/20 at 6:15 pm
Posted on 12/9/20 at 6:14 pm to geauxcats10
PEMDAS
Posted on 12/9/20 at 6:14 pm to geauxcats10
I would’ve failed this class real quick
Posted on 12/9/20 at 6:15 pm to geauxcats10
bErNoULLi
Posted on 12/9/20 at 6:16 pm to geauxcats10
Probably easier to run power out to the well and put the pump there IMO 
Posted on 12/9/20 at 6:16 pm to geauxcats10
quote:
The well head is roughly 350' away from house
Posted on 12/9/20 at 6:17 pm to geauxcats10
Can you wait until DukkeV is available?
This sounds right up his alley.
This sounds right up his alley.
Posted on 12/9/20 at 6:18 pm to geauxcats10
Is there level ground between the well and the house?
Posted on 12/9/20 at 6:20 pm to geauxcats10
quote:
Pump is a 1hp 24.5 gpm
Posted on 12/9/20 at 6:22 pm to geauxcats10
That pump will cavitate to all hell with a 350ft run of pipe from suction well. Take the advice and move the pump closer to the well. Also, you may have too much piping loss with said pump with either size line. You're looking at 32.9 ft head loss/100 ft of pipe for the 1" and 8.5ft head loss/100 ft of pipe for 1.25".
Posted on 12/9/20 at 6:25 pm to geauxcats10
Based on charts in the Google...
At ~20 gpm:
For 1” pipe, you lose 20 ft of head per 100 ft.
For 1.25” pipe, you lose 5 ft of head per 100 ft.
This doesn’t account for any fittings or elevation changes. You’d also have to keep this amount of piping primed for the pump to push it through.
If you want it closer, definitely need to go 1.25” pipe. Sounds like you could go 200’ away and be okay
But I’m not really a pump guy.
At ~20 gpm:
For 1” pipe, you lose 20 ft of head per 100 ft.
For 1.25” pipe, you lose 5 ft of head per 100 ft.
This doesn’t account for any fittings or elevation changes. You’d also have to keep this amount of piping primed for the pump to push it through.
If you want it closer, definitely need to go 1.25” pipe. Sounds like you could go 200’ away and be okay
But I’m not really a pump guy.
Posted on 12/9/20 at 6:27 pm to Spankum
quote:
Is there level ground between the well and the house?
Yes, the ground is relatively flat between the well head and the house
Posted on 12/9/20 at 6:32 pm to geauxcats10
That’s a lot of expensive suction hose that won’t collapse. Friction on that long of a run is going to be a problem. Much more efficient and MUCH easier on your pump to put it closer to source.
Posted on 12/9/20 at 6:34 pm to geauxcats10
So the correct and short answer is the pump goes at the well. It will lift what the spec sheet says that is why they have engineers design and test them it is not a guess.
The pump is there to lift the water then pump it to the house not suck it over to the house.
If you really want the pump by the house you have 3 options
1. Drill a new well next to the house.
2. Find/Pay an engineer to make a hydraulic model for you based on the piping, pump, distances you have provided. FYI I do this for a living and would feel bad taking you money to tell you put it at the well.
3. Say screw it and install it by the house and see if it works. You might get something but it won’t be 24.5 GPM.
The pump is there to lift the water then pump it to the house not suck it over to the house.
If you really want the pump by the house you have 3 options
1. Drill a new well next to the house.
2. Find/Pay an engineer to make a hydraulic model for you based on the piping, pump, distances you have provided. FYI I do this for a living and would feel bad taking you money to tell you put it at the well.
3. Say screw it and install it by the house and see if it works. You might get something but it won’t be 24.5 GPM.
Posted on 12/9/20 at 6:36 pm to geauxcats10
Those are 1st year operator questions, or IE questions on a test.... Engineering math.... 
talk to a plant baw....
talk to a plant baw....Posted on 12/9/20 at 6:38 pm to biohzrd
I’m not an engineer Baw. I’m the guy needing a pump for a well.
Posted on 12/9/20 at 6:38 pm to geauxcats10
I pumped your mom’s well last night.
Posted on 12/9/20 at 6:38 pm to geauxcats10
I would pump into a tank and then use another pump for the supply line personally.
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