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Photograph of a drilled well casingWell Pump Life Expectancy
Life of Jet Pumps, Submersible Pumps, Hand Pumps, Solar Pumps, VFD Pumps, Wind Operated Pumps

Well pump & water pump life:

This article series describes the different types of water pumps or well pumps, and we list the factors affecting the life expectancy of water pumps and we include a list of steps to take to maximize the life of a well or water pump and its motor.

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Life Expectancy of Water Pumps - varies by pump type, usage, and other factors

Types of water pumps (C) Carson Dunlop AssociatesIn this article we discuss how long you can expect a water pump to last and what factors affect its life.

Specifics of different types of water pumps can be read in detail at these articles:

How Long Does a Water Pump Last?

Well pump life depends - on pump type, duty cycle, usage, water chemistry, even voltage levels.

Above, our sketch of a types of well water pumps is courtesy of Carson Dunlop Associates. The drawing shows the key differences between a one line jet pump, two line jet pump, and a submersible water pump.

Jet Pump Life Expectancy

An above-ground one line (shallow well) or two line (deep well) jet pump often operates for a considerable range of years, as few as 4 years or as many as 15 or 20 years before needing replacement.

A typical well pump life expectancy (lumping both the electric pump motor and the pump assembly together) is about 10 years in the U.S. and Canada, and about 5 years in Mexico and Central America.

See details about jet pumps at

WATER PUMP, ONE LINE JET

and

WATER PUMP, TWO LINE JET

Submersible Water Pump Life Expectancy

A submersible well pump, perhaps because the motor is kept cool by being immersed in well water, can also have a considerable range of life expectancies depending on the variables which we list below.

A submersible pump operating in low-sediment water may have a 15 year life while the same pump in high sedimented water and without adequate sediment and check valve protection may fail in 5 or 6 years.

See details at WATER PUMP, SUBMERSIBLE

Hand dug well Pitcher Pump Life Expectancy

Below we illustrate a traditional cast-iron hand pump on a drilled well in Two Harbors, Minnesota.

Summerblue arts camp water pump, Two Harbors MN (C) Daniel Friedman Lon Church

Photo above, courtesy Lon Church, Summerblue Arts Camp, Two Harbors, MN.

A pitcher pump or hand pump itself, has a design life of 15-20 years but with a little maintenance such as lubrication, can last decades.

The leathers that produce the water lift ability on hand pumps or pitcher pumps on shallow wells need to be replaced every 3-5 years.

Hand-operated well pumps or pitcher pumps may last for 50 years or more, thanks to their mechanical simplicity and provided that the well itself is constructed for long life.

However replacement of the hand pump's working parts, particularly the pump leathers, will be required as often as every 5-10 years depending on the pump's use, climate, and maintenance.

See details at HAND PUMP for WELLS

HAND DUG WELLS includes sources for hand pumps or pitcher pumps and repair parts.

Rope & Bucket, Hand Dug Well Life

Below: in the simplest of wells, the rope and bucket and winch system of this 1700's dug well is still in operation at Las Trancas in Guanajuato, Mexico.

Rope and bucket in dug well, Las Trancas, Guanajuato (C) Daniel Friedman

The life expectancy of these simple hand dug wells depends on the climate and changes in the water table rather than on the equipment used to lift water from the well.

Factors Affecting the Expected Life of a Well Water Pump

Which Parts Wear Out on Water Pumps?

Schematic of a centrfugal water pump (C) Carson Dunlop Associates

Water pumps operated by an electric motor

What looks like "a well pump or water pump" actually is a collection of major assemblies and more numerous minor parts.

The major assemblies on an above ground water pump (such as a one line or two line jet pump) include the electric motor that drives the pump and the actual pumping assembly that moves water from the well to the water pressure tank and on into the building.

You an see the pump impeller in the sketch at left. Hard water, dirt and sediment, little stones, or other debris can damage this component: the pump motor may run just fine but less water pressure or flow may be delivered by the pump.

A submersible pump includes these two major assemblies (electric pump motor and water pump assembly) and adds an internal check valve.

Sketch courtesy of Carson Dunlop Associates, a Toronto home inspection, education & report writing tool company [ carsondunlop.com ].

Also see WATER PUMP LIFE MAXIMIZATION for a list of steps to take to get the most life out of a well pump or water pump.

What is Well Pump Cavitation?

Well pump cavitation describes the entry of air or gases into the mechanical parts that are trying to move water through a water pump.

The presence of air or other gases in the actual pump chambers or around the water pump impellers leads to overheating of these parts and mechanical damage to the pump moving parts.

Cavitation can also cause the pump to have to work longer to satisfy the water demand and thus its electric motor to overheat, also reducing motor life.

Cavitation inside of a water pump can be caused by several problems including:

  1. Inadequate well yield: if the yield of a well drops for any reason, trying to pump water beyond the safe yield of a well pump can introduce air into the well pump and water piping.

    See WELL YIELD DEFINITION where we define safe well yield.

    Also see AIR DISCHARGE at FAUCETS, FIXTURES.
  2. Oversized pumps that mismatch the well flow rate to the pump's output rate can also cause the pump to form a strong vacuum inside the pumping chamber around the pump impeller. The vacuum, in turn, causes dissolved gases in the water itself to leave solution and return to bubble form.

Low Water Cutoff Devices and Well Tailpieces for Well Pump Protection on a Low-Flow-Rate Well

Well pump protection tailpiece © D Friedman at InspectApedia.com For details about well pipe tailpieces, tail pipes, or other low water cutoff devices that protect the well pump from damage when the well flow is too limited, please see our compete article at WELL PIPING TAIL PIECE. Excerpts are just below.

When the well pump's capacity is known to exceed the flow rate of the well, a tail pipe, tail piece, or low water cutoff control is installed to protect the pump from damage.

The well piping tailpiece (also shown in this sketch [image file]) permits the in-well water pump to continue to run by recirculating well water within the pump but by halting delivery of water or slowing delivery of water to the building.

Many sources, including the Penn State School of Forest Resources recommend installing a low water cutoff device to protect a well pump that has to operate in an inadequate or low-yield well.

A still different approach that may provide some water pump protection by reducing the well pump cycling rate is the installation of a Smart Tank that regulates water flow in the building.

Pressure Sensitive Water Pumps & Inline Control Water Pumps

Pressure sensitive pumps and inline pump controllers provide water pressure boosting, rainwater harvesting, or similar functions without requiring a water pressure tank.

See WATER PUMP VARIABLE FREQUENCY / VARIABLE SPEED DRIVE (VFDs)

Research on Life Expectancy of Various Types of Water Well Pumps

 




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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

Question: does pressure control switch setting level affect well pump life?

2019/03/31 Gary said:

Are low (20/40) or high (40/60) switch settings better or worse for pump life, and why?

This Q&A were posted originally at WATER PUMP DRAWDOWN VOLUME & TIME

Reply:

Gary

I offer two apparently but not really contradictory answers:

1. A pump that is required to reach a higher cut-off pressure before it turns off - all else being equal - has to work a bit harder so might run a bit longer or a bit hotter, factors that *could* affect pump life.

2. However, As long as you are operating a water pump within the pressure range for which it is designed and more-important the duty cycle for which it's designed, the cut-off pressure range should not measurably affect the pump life.

Starting at WATER PUMP LIFE EXPECTANCY (at the top of this very page) you'll see that there are factors that affect well pump life, among which the pressure control switch does, indirectly play a part.

In my opinion the most harmful problems affecting pump life are rapid on-off short-cycling. (see SHORT CYCLING at the end of this page)


...

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Or see WATER PUMP LIFE EXPECTANCY FAQs - questions and answers posted originally at the end of this article.

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WATER PUMP LIFE EXPECTANCY at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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