Borewell Rising Mains
Rising mains strong enough to hang a submersible pump on.
Overview
The pressure line from a submersible pump deep in a borewell up to the overhead tank. It is strong enough to carry the weight of the pump and springy enough to absorb the shock every time the pump starts.
Specification
- Product range: QFlow Solid-Wall HDPE
- Standard: IS 4984
- Rising Main Sizes: 32 mm to 110 mm OD
- Pressure Rating: PN 10 to PN 20 (SDR 9)
- Standard Code: IS 4984 / PE 100 grade
Why HDPE here
- Never rusts and never scales up inside
- Soaks up the shock each time the pump switches on and off
- A smooth bore means less resistance, so the motor draws less power
Typical deployments
- Submersible pump columns
- Deep borewell discharge
- Tubewell distribution lines
- Drinking water lifts
Specification and site notes
Pressure class comes from head plus surge
The rising main sees static head to the delivery point plus the surge when the pump cuts in or out. PN 10 suits shallow lifts; deep borewells and high-head duties need PN 16 or PN 20 (SDR 9). Under-specifying here shows up as a burst at the surge, not at steady state.
Suspended load
The column carries the pump, the water in it and the cable. Confirm the total suspended weight against the pipe's tensile capacity at the setting depth, and support the head with a proper clamp, never on the fitting alone.
Why the energy bill falls
A scale-free bore holds its friction loss for the life of the main, where a galvanised iron column rusts up inside and the head loss climbs year after year. The pump then has to work harder for the same output. HDPE does not do this.
Surge and cycling
The pipe's elasticity absorbs water hammer when the pump cycles, which protects the joints and the non-return valve. A rigid column transmits that shock straight into the fittings.
FAQ
What pressure class should a borewell rising main be?
Size it on the static head to the delivery point plus a surge allowance. PN 10 covers shallow lifts; deep borewells and high-head duties need PN 16 or PN 20 (SDR 9). Under-specifying shows up as a failure at the surge, not at steady running.
Can HDPE pipe carry the weight of a submersible pump?
Yes, within its tensile capacity at the setting depth. Check the total suspended load (pump, water column and cable) against the pipe rating, and support the head with a proper clamp rather than on the fitting.
Why does an HDPE rising main reduce pumping cost?
Because the bore does not scale up. A galvanised iron column rusts up over the years and the friction head climbs, so the pump has to work harder for the same output. HDPE holds its original friction loss for the life of the main.
What sizes are used for rising mains?
32 mm to 110 mm OD covers the great majority of submersible installations. Coiled supply is available to order across that range, so a column can go down with no intermediate joints; from 63 mm upward 6 m sticks are the default and are jointed as the string is lowered.
Commonly specified sizes
Related applications
See also
For CAD drawings, compliance certificates and B2B pricing estimates, contact mktg@alom.in.
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