523’ deep with 6gpm and 45’ static level. I am putting my well pump at 300’ .... I’m getting a 1.5hp pump from RPS.
Suggest stating which specific pump model you are considering. A 1.5 HP pump would typically be too much pump for supplying water from a 45' to 300' depth, which would likely result in the longevity of the pump being compromised due operating in an upthrust condition.
To address your initial question, a 'pump saver' device would typically be utilized when there is a high potential for the well becoming pumped too low, down to the pump's inlet screen, thereby resulting in the pump drawing air and not being adequately cooled.
By your comments in this and your other thread, it seems there is little potential for your well to become pumped too low. Although a pump protection device is likely not necessary, there would be no harm in installing one if that would make you more at ease. The device most often recommended in this forum is the Cycle Stop Valve Cycle Sensor shown
HERE.
I’ll go deeper later if it comes to light that the pump is not deep enough.
Since this is a new well, and because there is substantial depth still available below 300', and as you are not fully comfortable that 300' will be adequate, why not simply place the pump at a deeper depth right from the start such as at 350' or 400'? In this manner, you will likely never need to pull up the pump to extend the length of the electrical supply cable and drop pipe.
Recommendations: If your well casing is 4" or larger in diameter, suggest utilizing a flow inducer sleeve around the pump. This will ensure water drawn into the pump's inlet screen, will flow closely past the pump's electric motor from below, to ensure the motor will continue to be sufficiently cooled while operating.
Although a submersible pump's built-in check valve is usually the only check valve needed, for redundancy, suggest threading a high quality check valve directly into the pump's outlet connection before installing the drop pipe fitting.
Recommend upgrading your well water system with a Cycle Stop Valve. The PK1A kit shown
HERE, includes a CSV device, pressure tank, pressure switch, pressure relief valve, fittings and wall brackets.
A CSV will extend the life span of the pump, pressure tank, pressure switch and other components. Because the CSV will cause the pump to supply only the exact amount of water that is being consumed at any particular time, the pressure supplied to fixtures will remain constant once the pump is operating. Because the CSV will prevent the pump from cycling whenever more than 1 GPM is being consumed, a large pressure tank will no longer be necessary so the 5 gallon pressure tank normally included in the kit, will typically be all that is needed for a single residence system.
To view how a CSV functions, see the following ink:
CSV Interactive Animation
