degrub

Drift

Challenger

Bali

Wight

(at the ) wheel ( US band)

For the overflow return, knowing the inlet flow, the height between the overflow nozzle and the top hat relief ( max driving force for return without overflow out top hat) , pressure drop from pump discharge to fill inlet, & pump head curve, one could predict the line size required to prevent overflow out the top hat. To minimize the increase, just run the overflow return from the chosen height to ground level and use a trench back to the pond. My guess would be a 4 or 6 inch might do it.

At least everyone would know when the battery died ….

Donovan

Ginger

Done

Smoke

Chic

Rose

Traveler

Money

Garlic

Pennsylvania

A

Bernard

Where is the switch to turn the pump on/off ? you could replace or supplement the switch with a timer set to the minimum fill time from empty or less. i would not put in a block valve on the line to the tank in any case without a relief path for deadhead that allows flow through the pump. This system does not appear to be designed to be blocked in and appears “safe” as designed. Steam/water explosions are nasty and will throw pump casing bits quite a ways . from the description, it appears there is already an overflow on the tank . Since it has happened before, i assume there was no harm to the tank. if you only have a couple days to deal with this, it sound s like calling bil daily is the plan. The worst case seems to be overflowing the tank for a while.

Assuming the pump is on land, Just cut in a reducing T close to the pump discharge and either connect a 5-10 mm line/hose going back to pond or same with a spring upstream pressure regulating valve set for slightly less than the pump deadhead pressure. pump will turn itself off every night , correct ? is the pump for the line from the lake to the tank also submersible? If so, dead heading should not matter. it would help if we knew where there are check valves and other valves in the lines between the lake and the tank. Also, brand and model of pump, self priming, etc. most atmospheric tanks will have a vapor vent line on the roof to handle overflow conditions. If not, then rupturing the tank at a bottom seam is possible since the piping is usually stronger.

Righteous

heretic

Raven

Skill