Thanks again for all the replies.
I've narrowed my choice of pumps down to 2 choices.
Sorry for the long post, but I thought if I give all of my well specs., that someone might point me to the right choice.
My well is 6†diameter and 115' deep; it's rated output is 5gpm.
It was drilled on 4/30/13 and at that time the static water level was 50'.
As of Jan 4 this year, the static water level was 57'.
With the pump at 100' deep, the amount of water available from the static level to the pump (43')
is approx. 60 gal. (1.4gal/ft).
If I set the pump on/off at 30-50psi, the total head at the 30psi start is:
57' (ground to static level) + 4' (house sets 4' off ground) + 69' (30psi) + 8' (approx. friction loss, 100' of 1†pipe + 62' of 3/4†pipe @ approx. 5gpm) + 10' (approx. loss for (2) 90 deg. Elbows @ 5gpm) for a total head of 148'.
And the total head at the 50psi cutoff (after pumping 15 gals to fill the pressure tank) is:
68' (ground to static level after pumping down 11') + 4' (ground to house) +115' (50psi) + 3 (approx. friction loss, 100' of 1†pipe + 62' of 3/4†pipe @ approx. 2gpm) + 3' (approx. loss for (2) 90 deg. Elbows @ 2gpm) for a total head of 193'.
A total head worst case scenario would be if I were to pump down to the 100' level, at which point the total head at cutoff would be 193' + another 32' for a total of 225'.
My pressure tank will be a 44 gal. Model with a fill capacity of approx. 15 gals.
My water usage will be such that when the pump comes on, it will only pump the 15 gals to fill the tank. (Unless some flushes the toilet while the pump is running, then the pump would probably pump another 3 to 5 gals.)
Now, for the 2 pumps that I'm considering.
(Pump #1 will be marginal, and may not work on the worst total head scenario.)
It is a Grundfos Model 10SQ05-160-115v, a 10gpm rated pump, 2 wire, 1/2hp, 115v.
It's pump curve goes from 14gpm @ 80' total head to 1gpm @ 220' total head.
(The 5 & 7 gpm Grundfos pumps in 1/2hp, 115v seem to be special order items at a significantly higher price and 1 or more month lead time.)
Pump #2 is a Goulds Model 7GS05411C, a 7gpm rated pump, 3 wire, 1/2hp, 115v.
It's pump curve goes from 10gpm @ 120' total head to 1.5gpm @ 290' total head.
On pricing, the Goulds pump with control box is $28 more than the Grundfos pump.
One advantage of the Goulds model is that I could increase the pressure from 30-50 to 40-60.
Base on the test that VAWellDriller did with the 2 wire pump, from what I have been able to learn, the
3 wire pump should require even less start current from the Honda generator.
So, which pump of these two would you choose and why ?
Again, thank you so much for your replies,
Arky