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Water Pump Bits and Pieces
By Steve Maxwell
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Few people with cottages or rural homes consider running water a luxury these days. That’s why water pumps are so common. But before you can select the best pump for your situation, there are two technical realities you must understand. First of all, water can’t be sucked up from vertical depths greater than 25 feet. If you try, the liquid water turns to vapour in the vacuum created, and nothing comes out of your pipes. That’s not to say that pumps can’t be used to move water into your home from greater depths, just that they don’t do it by suction. You’ve also got to realize that pumps must be filled with water before they can work. This is called priming and it has a sometimes-major effect on pump operation, depending on your situation. Some pumps are stopped when a tiny amount of air enters the system. And since some systems are more prone to air leaks than others, the prime-tolerance of a pump matters.
Jet Pumps
These are the most common residential water pumps because they have three things going for them. Jet pumps are comparatively inexpensive, mechanically simple, and have the ability to draw water from great depths. By locating the pump’s “jet” at the bottom of a deep well, connected to the pump by two poly pipes, jet pumps draw water by moving the suction-action down below. The job of the pump as it sits in your basement or pump house is simply to circulate water down to the jet through one pipe, and up from the jet through the other. A venturi within the heart of the submerged jet creates suction from this water flow, suction that pushes water up top through the return pipe. Jet pumps can also be used for shallow well operations (less than 25 feet lift), with the jet bolted to the pump itself, and one pipe leading down into the water. Jet pumps have two drawbacks: they’re the loudest of the three main types of residential water pumps, and a tiny amount of air in their impeller case will stop pumping action.
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Water Pump Bits and Pieces
By Steve Maxwell
|
|
|
Few people with cottages or rural homes consider running water a luxury these days. That’s why water pumps are so common. But before you can select the best pump for your situation, there are two technical realities you must understand. First of all, water can’t be sucked up from vertical depths greater than 25 feet. If you try, the liquid water turns to vapour in the vacuum created, and nothing comes out of your pipes. That’s not to say that pumps can’t be used to move water into your home from greater depths, just that they don’t do it by suction. You’ve also got to realize that pumps must be filled with water before they can work. This is called priming and it has a sometimes-major effect on pump operation, depending on your situation. Some pumps are stopped when a tiny amount of air enters the system. And since some systems are more prone to air leaks than others, the prime-tolerance of a pump matters.
Jet Pumps
These are the most common residential water pumps because they have three things going for them. Jet pumps are comparatively inexpensive, mechanically simple, and have the ability to draw water from great depths. By locating the pump’s “jet” at the bottom of a deep well, connected to the pump by two poly pipes, jet pumps draw water by moving the suction-action down below. The job of the pump as it sits in your basement or pump house is simply to circulate water down to the jet through one pipe, and up from the jet through the other. A venturi within the heart of the submerged jet creates suction from this water flow, suction that pushes water up top through the return pipe. Jet pumps can also be used for shallow well operations (less than 25 feet lift), with the jet bolted to the pump itself, and one pipe leading down into the water. Jet pumps have two drawbacks: they’re the loudest of the three main types of residential water pumps, and a tiny amount of air in their impeller case will stop pumping action. |
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