Evidence-first editorial standard
This guide separates observed facts, engineering assumptions and data that still require confirmation. It does not promise a universal service life or replace the exact product data and project specification.
The outlet is where wear and flow problems meet
In a silo, bin or hopper, the material converges in the cone and accelerates towards the opening, so the lower cone and the outlet flange see the highest sliding velocity and pressure. They are also where arching, ratholing and segregation begin. A liner chosen only for wear can make flow worse; one chosen for flow alone may not last. Both must be checked together, as explained in hopper lining, wear and flow.
The flow pattern sets where the cone wears
In mass flow, all the material moves and slides along the cone walls, so wear is spread over the cone and peaks near the outlet. In funnel flow, material moves in a central channel and the walls see little sliding, except where the channel meets them, often near the outlet or at a transition. Off-centre outlets and partial feeders make the wear one-sided. Map the wear inside the cone and relate it to the flow you observe at the outlet.
A liner must lower wall friction, not raise it
Mass-flow cones are designed for a given wall friction; a liner with higher friction can turn mass flow into funnel flow, with ratholes and stale material. Smooth alumina tiles laid with tight, flush joints and no steps against the flow keep friction low. Joint orientation matters: edges must not face the flow. Where the material is cohesive or wet, elastomer or polymer liners may flow better, compared in rubber, polyurethane or ceramic.
The outlet flange, gate and transition need shaped parts
The last part of the cone, the outlet flange and the slide or rotary gate below take the highest velocity in the smallest area, and standard tiles leave too many joints there. Shaped segments in IC CUSTOM made to the cone angle and outlet diameter reduce joints, and alumina tiles in IC TILE cover the upper cone. Check that the lining thickness does not reduce the outlet size below what the flow requires.
The feeder below is part of the same system
Belt, apron, vibrating or screw feeders under the outlet determine how the material is drawn and where it wears; an uneven draw makes the cone wear unevenly and can cause funnel flow. The liner of the feeder skirt and the transition to it must match the outlet, as discussed in apron feeder liner wear and screw conveyor wear. Treat cone, outlet and feeder as one wear and flow problem.
What to send for a silo outlet liner quote
Send the cone geometry (angle, outlet size, transitions), the design flow pattern if known, the material with particle size, moisture and cohesiveness, the throughput, the temperature, the feeder type, the measured wear map and any flow problems observed. Induscoat then proposes the lining by zone with a low-friction joint layout and IC BOND fixing; the approach for bins and hoppers is on our page on ceramic linings for chutes and hoppers.