Messages

1

Applications / Re: Pumping from a Cistern

« on: August 04, 2020, 10:07:45 AM »

Hi, Cary.

I contacted Hallmark Industries after receiving my pump because the actual specs on the pump did not match the listing on their website.  They kindly responded and told me what I received was the new all stainless steel [including the discharge] version of the pump, MA0460X-9A-DO, 1 hp, 5.2 amps, with a max head of 220’.

So, using the information/formulas you previously provided, this is what I came up with:
-   Pump max head = 220’, or 95.2 psi (max head divided by 2.31) = maximum back pressure on pipe.
-   Pump height/2.31 = 53/2.31 = 22.9 = psi lost
-   PSI available at the house = 95.2 – 22.9 = 72.3
-   Pressure differential between max head and 50psi CSV setting = 95.2 – 50 = 45.2
-   [From the pump manufacturer] Flow at water level of 53’:
           The minimum total head (@40 psi) = 53' + 40 x 2.307 = 145.28'
           The maximum total head (@60 psi) = 53' + 60 x 2.307 = 191.42'
-   Max pumping level to a pressure tank, 40/60 psi switch @60 psi:
           220 – 60 x 2.307 = 81.58’

Can you confirm the calculations/assumptions above look correct, and would this work with the Pside-kick kit with a 10-gallon tank, 40/60 switch, 50 psi setting?

2

Applications / Re: Pumping from a Cistern

« on: July 24, 2020, 12:20:11 PM »

So my new pump arrived today.  It's the Hallmark MA0460X-9A.  My last concern is backpressure on the pipe between the pump and the CSV since it will be buried in a trench and not easily accessible.  Would you mind telling me how to calculate the backpressure on the pipe?  I don't know if this is too little/much information. 
Elevation from cistern to house is 53'. 
Total length of 1 1/2" PVC pipe is 350'.
Pump is 1hp, 230V, 5.8amps, 240' max head for open water tanks, 25 gpm (max), 13 gpm (rated)
The CSV I am looking at is the Pside-kick kit with a 10 gallon tank, 40-60 switch, 50psi setting.
My apologies for so many questions.

3

Applications / Re: Pumping from a Cistern

« on: July 21, 2020, 11:47:15 AM »

Cary,
Thanks so much for your response.  I have some updated information regarding the pump height from the cistern.  Maybe not the best method, but I used 4 different devices [2 cell phones using triangulation and 2 Fitbits measuring floors climbed] and got an average pump height of 52.9’.  Using your previous calculations with my pump with a max head of 207’ (or 89psi), my psi lost would be 52.9’/2.31 = 22.9, with 66.1 psi available at the house.  Is that correct?

I’m not sure if I will be able to return the pump I just bought.  If not, would it be acceptable to use with a 30-50 pressure switch and a CSV setting of 40?  Would the adjusted numbers allow use of a 40-60 pressure switch, or is it still too marginal?  If I can return it, I’m looking at a slightly smaller Hallmark MA0460X-9A pump with max head of 240’.  Would that be a better option?

MikeInTN

4

Applications / Pumping from a Cistern

« on: July 20, 2020, 12:54:28 PM »

Hi, I’m new to the forum after lurking for some time.  I spoke with someone very helpful in your office last week – Sam – but have a few follow-up questions I wanted to post and thought it might prove useful to others who may encounter a similar situation.  After a couple of failed attempts with low producing wells, I am having a spring developed that produces ~7gpm.  This spring will be feeding a 1200-gallon cistern buried a few feet below the source of the spring.  I purchased a Hallmark Industries MA0414X-7A [230V 2-wire] submersible pump.  Pump will be mounted in a 4” flow inducer sleeve and mounted horizontally on top of two 4” PVC pipes as I’ve seen pictured elsewhere here on your forum.

This set-up, initially, will be supplying a single-story home located ~70 feet above the cistern, with a horizontal distance of [I’m guessing] 350 feet.  The person developing the spring and installing the tank is burying 1½” PVC and 10-3 wire.  I could’ve used 10-2 but I didn’t know at the time what pump I would be using.  I want to use the PK1A Pressure Tank Kit with the 10-gallon tank, 40-60 pressure switch, with the CSV setting of 50psi.  The pressure tank and CSV will be located at the house, and not at the cistern so that I can weather/critter-proof them. 

Most of the discussions posted here relate to using wells as the water supply, so I’m not sure how things like maximum head and backpressure come into play when pumping from a cistern.  Could you comment on this set up?  Also, I’ll need to install a 1¼” nipple, check valve, and 90* elbow on the pump, and I’m curious what you used in your example picture [the one with the horizontal installation] – brass, stainless, galvanized?  On the flow inducer sleeve, would 4” pipe give enough flow around the motor for cooling?  My pump is listed as having a max diameter of 3.8”, but I think that includes the bump out for the wiring.  Is SDR35 safe for drinking water or would you use PVC in that case?  Do you use or recommend anything to center the pump in the sleeve, such as bolts spaced at 120*?  Anything else I should be concerned about?

Thanks in advance,

MikeInTN