Model: Deep well submersible pumps
The riser pipe carries the water and hangs the pump. How to choose between steel, plastic and flexible riser for a deep well submersible pump.
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In a deep well, the riser does two jobs at once: it carries the water up, and it carries the weight of the pump, the cable and the water inside it. Deep well submersible pumps place no special demand on the riser material, as long as it can take the pressure and the load.
| Riser | Good for | Watch out for |
|---|---|---|
| Steel pipe with flanges | Deep settings, high heads, large pumps | Weight, and corrosion in aggressive water |
| Stainless steel pipe | Corrosive or drinking water | Cost |
| Plastic pipe | Shallower settings within its pressure rating | Pressure at the bottom of the column, and the hanging load |
| Flexible hose | Light pumps, temporary or quick installation | Its pressure and load rating, and twisting on start |
The bottom of the riser sees at least the full head of the pump. A pump rated for 200 m puts about 20 bar on the lowest joint, so choose the pipe and gaskets for that, not for the pressure at the top.
Fix the cable to the riser at every pipe, in the groove of the flange where there is one, so it cannot rub against the well wall or be crushed by the clamps when the pump is lowered.
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