Show Posts
1
Frequently Asked Questions / Adding a CSV1A and booster pump to existing pump system
« on: August 23, 2022, 10:08:26 PM »
I am considering a CSV1A/PK1A but have a couple of concerns/questions. I think the CSV might work, but want to double check my understanding.
Our current set up is a 20 year old Myers 1hp deep well jet pump pulling from a lake, set at 40/60 psi. I get a measured max flow at the pump discharge of 15-18 gpm. It goes into an 86 gallon diaphragm tank. I then have various filters after the tank. The issue is the top floor of our single family house is 20+ ft above the pump house. I get a measured static pressure drop of ~ 10psi at the house. So with no water flowing I get 30/50 at the house. With flow and of course some pressure drop across filters, we can get less than 30psi at the low end. I would like to change that and target a constant (or near constant) 45-50psi at the house.
So to get 50 psi at the house I need 60 psi at the pump/pump house. Now I don’t simply want to increase the pressure switch to 60/80 for a number of reasons. Our pump hits 60 psi no problem, but does not like much higher than that. I am sure it won’t hit 80 psi or even 70psi. That plus the higher range would significantly reduce our tank draw down, and puts more pressure on our supply lines from the lake (which for other reasons would be bad).
What I am thinking of doing is putting a booster pump plus small second tank in series after all the filters with a check valve in the line from the current system main to the booster pump suction. In this case, I would lower the current system to maybe 20-40 or so. Then have the booster pump set at 50-70 with the CSV set at 60 (would give me roughly 50 at the house).
One other, possibly the biggest issue, is that we live in Texas and the pumps and plumbing are in a 6 x 12 un-conditioned pump house. This year we have a had a lot of days of 100F+ days. I actually monitor the temp in the pump house, and I looked back and even on 110deg days, the pump house only got up to 96-97 deg.
Now the questions/concerns. While the temp seems to only have gotten to ~96-97 deg in the pump house, I see the CSV1A specs say max temp is 100deg. It is also possible that there could be local spots hotter than where I have the temp probe. Is getting close to that 100F on a possibly week or month long basis going to be a reliability problem for the CSV1A?
At a 50/70 booster pump setting, will a 5gal tank be too small and fill up/draw down too fast to keep a min 1 min on time and min 1 min off time (would the pump cycle too much). Would a 10 gal or even 20 gal be better? I see a post where you suggested a 10gal for a 50-70 setting so I suspect the answer is still yes. Now I understand that the CSV holds a relatively constant pressure (subject to reduced pressure fall off) when the pump is on. When it is off you will see the total pressure tank range. This means when you turn on a faucet you will see a high pressure falling off to the low setting until the pump comes on and the pressure stabilizes at the CSV setpoint, correct? I assume this is why a smaller tank works better, because the small (but not too small) draw down minimizes the time of that dropping pressure?
Any issue using the booster pump + CSV after the main pump+tank+filters?
One last thing, talking of pressure, how do you get the total pressure drop across the CSV from the tables? For the CSV1A at 10 gpm is it a total of about a 10psi drop (5 psi for friction and 5 psi for reduced pressure fall off)?
Thanks
Our current set up is a 20 year old Myers 1hp deep well jet pump pulling from a lake, set at 40/60 psi. I get a measured max flow at the pump discharge of 15-18 gpm. It goes into an 86 gallon diaphragm tank. I then have various filters after the tank. The issue is the top floor of our single family house is 20+ ft above the pump house. I get a measured static pressure drop of ~ 10psi at the house. So with no water flowing I get 30/50 at the house. With flow and of course some pressure drop across filters, we can get less than 30psi at the low end. I would like to change that and target a constant (or near constant) 45-50psi at the house.
So to get 50 psi at the house I need 60 psi at the pump/pump house. Now I don’t simply want to increase the pressure switch to 60/80 for a number of reasons. Our pump hits 60 psi no problem, but does not like much higher than that. I am sure it won’t hit 80 psi or even 70psi. That plus the higher range would significantly reduce our tank draw down, and puts more pressure on our supply lines from the lake (which for other reasons would be bad).
What I am thinking of doing is putting a booster pump plus small second tank in series after all the filters with a check valve in the line from the current system main to the booster pump suction. In this case, I would lower the current system to maybe 20-40 or so. Then have the booster pump set at 50-70 with the CSV set at 60 (would give me roughly 50 at the house).
One other, possibly the biggest issue, is that we live in Texas and the pumps and plumbing are in a 6 x 12 un-conditioned pump house. This year we have a had a lot of days of 100F+ days. I actually monitor the temp in the pump house, and I looked back and even on 110deg days, the pump house only got up to 96-97 deg.
Now the questions/concerns. While the temp seems to only have gotten to ~96-97 deg in the pump house, I see the CSV1A specs say max temp is 100deg. It is also possible that there could be local spots hotter than where I have the temp probe. Is getting close to that 100F on a possibly week or month long basis going to be a reliability problem for the CSV1A?
At a 50/70 booster pump setting, will a 5gal tank be too small and fill up/draw down too fast to keep a min 1 min on time and min 1 min off time (would the pump cycle too much). Would a 10 gal or even 20 gal be better? I see a post where you suggested a 10gal for a 50-70 setting so I suspect the answer is still yes. Now I understand that the CSV holds a relatively constant pressure (subject to reduced pressure fall off) when the pump is on. When it is off you will see the total pressure tank range. This means when you turn on a faucet you will see a high pressure falling off to the low setting until the pump comes on and the pressure stabilizes at the CSV setpoint, correct? I assume this is why a smaller tank works better, because the small (but not too small) draw down minimizes the time of that dropping pressure?
Any issue using the booster pump + CSV after the main pump+tank+filters?
One last thing, talking of pressure, how do you get the total pressure drop across the CSV from the tables? For the CSV1A at 10 gpm is it a total of about a 10psi drop (5 psi for friction and 5 psi for reduced pressure fall off)?
Thanks