Slurry & Dredging Lines
Abrasion-resistant HDPE for pumped solids and floating discharge.
Overview
Pumped slurry, ash, sand and dredge spoil lines for mineral processing, thermal power ash handling and river or harbour dredging. Chosen for wear life against grit-laden flow and for the ability to fuse a floating discharge string.
Specification
- Product range: QFlow Solid-Wall + Alcorr DWC HDPE
- Standard: IS 4984 / IS 16098
- Pumped Line Sizes: Up to 315 mm OD
- Gravity Line Sizes: ID 100 mm to ID 800 mm
- Standards Used: IS 4984 + IS 16098
Why HDPE here
- Wear life against grit-laden flow well beyond that of steel of the same bore
- Fused empty string floats, so a discharge line is welded ashore and towed out to the cut
- Sections can be rotated to move the wear scar off the invert and extend life
Typical deployments
- Dredge spoil discharge strings
- Thermal power ash slurry lines
- Mineral tailings transport
- Sand and gravel pumping
Specification and site notes
Velocity is the whole design
Too slow and solids settle and block the line; too fast and wear rate climbs steeply. The workable window is narrow and depends on particle size and concentration, so it has to be set from the slurry characterisation before any pipe is selected.
Rotate the string to buy wear life
Wear concentrates on the invert. Rotating each fused section periodically moves the scar onto fresh wall and can extend service life substantially. Design the supports and the joints so rotation is actually possible.
Floating discharge
An empty capped HDPE string floats, which is what makes a dredge discharge line practical to place: it is fused ashore, towed out and anchored, then repositioned as the cut advances. Once it is running full of slurry the line is heavier than water, so a surface discharge run carries pontoons or clamp-on floats. HDPE's near-neutral density is what keeps that float requirement small.
Ash handling is a chemistry job too
Thermal power ash slurry is alkaline and abrasive at once. HDPE handles both, but confirm the temperature of the discharge, because that is the parameter that limits any polyolefin rather than the pH.
FAQ
Does HDPE outlast steel on a slurry line?
On abrasion, generally yes for the same bore. HDPE's resilient surface deflects rather than being cut by impinging particles, and there is no corrosion running alongside the wear. The trade is a lower pressure rating, so the two are chosen by duty rather than one always winning.
How do you get more life out of a slurry line?
Rotate the fused sections periodically. Wear concentrates on the invert, so turning the string moves the scar onto fresh wall. Designing the supports and joints so rotation is practical is worth doing at the outset.
Why does an HDPE dredge line float?
An empty capped string does, which is why the line is fused ashore and towed out to the cut. In service it is full of slurry heavier than water, so a floating discharge run needs pontoons or clamp-on floats. HDPE's near-neutral density is what keeps that float requirement small, and the fused line has no joint to work loose under wave action.
What limits the design of a slurry pipeline?
Velocity. Below the deposition velocity solids settle and block the line; well above it the wear rate climbs steeply. The workable window depends on particle size and concentration, so the slurry has to be characterised before pipe is selected.
Commonly specified sizes
Related applications
See also
For CAD drawings, compliance certificates and B2B pricing estimates, contact mktg@alom.in.
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