Side seals fit into the gap between the grate surface and the side wall. Their job is to stop air from bypassing so that the supply air actually passes through the combustion layer. We supply this spare part, and it can be supplied as a set with grate plates, chain links, pin shafts and similar items.
Seal position and function
In a flake-type chain grate system, the side seal is the part that prevents air bypass and is fixed at the edges on both sides of the grate. Once the sealing area wears, air leakage rises, and the excess air and slagging behaviour in the furnace change with it. Together with the adjacent side liner and clamping plates, it maintains the clearance at the grate edge.
Material and replacement interval
Spare parts for flake-type grates differ in typical service life depending on material, and side seals are usually made of ductile iron or alloy steel. The specifications and service life are compared below:
| Part | Material | Typical service life |
|---|---|---|
| Grate plate | Cr25Ni20 / Cr26Ni12 | 12-24 months |
| Chain link | Cr25Ni20 | 12-18 months |
| Pin shaft | Cr25Ni20 / Inconel | 8-15 months |
| Side seal | Ductile iron / alloy steel | 18-30 months |
Dimensions and tolerances
All parts are made to OEM dimensions and tolerances and shipped after precision casting and machining. The product meets technical standard NB/T 47050-2016; dimensions and material can be customised to customer requirements, and we also provide selection advice and matching of spare parts.





