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.
Both are mineral linings inside a steel pipe, made differently
Cast basalt is molten rock cast into sleeves or tiles and recrystallised; it is usually installed as thick sleeves grouted into the steel. Alumina ceramic is pressed and fired, then installed as tiles or as an integral sleeve, generally in thinner sections. Both resist sliding abrasion far better than plain steel; they differ in hardness, toughness, thickness and weight, and therefore in where along a line each one makes sense.
Straight runs and gentle wear suit cast basalt
On straight sections of slurry or pneumatic lines where the flow is steady and the wear is moderate and even, thick basalt sleeves provide a long-lasting wear layer at a material cost that is often competitive. The trade-offs are weight, a reduced bore for the same outer diameter, and sensitivity to thermal shock and heavy impact, which matter at supports, joints and during handling.
Bends, tees and high-velocity sections suit alumina
Where the flow turns, accelerates or becomes turbulent — elbows, tees, reducers, the spools after pumps and valves — the local wear is far higher than on the straight run, and a harder, thinner lining keeps the bore and the weight under control. That is where alumina-lined fittings such as IC PIPE are normally placed, as explained in ceramic-lined elbows and, for mining lines, tailings pipeline wear protection.
Weight, bore and joints often decide before wear does
Thick linings add significant weight per metre, which affects supports, handling and installation time, and they reduce the free bore, which matters for flow and pressure drop. At every joint, the lining must be continuous or protected, or wear starts at the step; see flange and bore misalignment. Compare options on the same outer diameter, the same flange standard and the same bore.
Temperature and thermal shock narrow the choice in power and process plants
In hot pneumatic lines — ash, pulverised coal, dried concentrate — both materials tolerate temperature, but the grout or adhesive behind them has limits, and rapid temperature changes stress thick, brittle sleeves. The fixing must be chosen for the steel temperature, as described in choosing an adhesive for ceramic tiles, and the power-plant case is detailed in pulverised coal pipe lining.
A typical split, and what to send for an offer
A common, economical arrangement keeps straight runs in basalt, rubber or steel and puts alumina in the fittings and the sections that fail first. Send the line isometric or a list of fittings with sizes, radii and flange standards, the slurry or conveyed material, velocity, temperature and the failure history. Induscoat then proposes the alumina-lined fittings and IC CUSTOM parts; the full approach is on our page on wear lining for slurry pipes and elbows, and the comparison with cast iron is in ceramic-lined, Ni-Hard or wearback pipe.