Submerged Overhanging Idler (SOI) / Inner Guide Wheel For Submerged Scraper Chain Conveyors in Thermal Power Plants

CMECH offers precision-engineered Submerged Overhanging Idler Wheels — also referred to as Inner Guide Wheels — specifically developed for bottom ash handling systems in submerged scraper chain conveyors (SSCCs). These wheels are a critical part of ash removal systems, operating in submerged and high-abrasion environments at the tail end of thermal power plant boilers.

Typical Application

Submerged Scraper Conveyors (SSCCs)
Bottom ash dewatering and discharge systems
Wet chain conveyors in boiler ash zones
Reversible and unidirectional bottom ash conveyors

Design & Construction

Each wheel is designed to operate in submerged or semi-submerged conditions with continuous exposure to:

Abrasive bottom ash
Water/moisture cycles
Thermal gradients and high mechanical loads

CMECH wheels are provided with:

Integrated cantilevered shaft mountings for direct frame fitment
Flanged outer ring design to guide the scraper chain movement within the trough
Stress-relieved cast or forged alloy steel bodies, for long-life performance in corrosive-slurry environment

Size Range & Variants

Available in PCD sizes from 400 mm to 650 mm
Shaft diameters from 19 mm to 42 mm, depending on load
Idler thickness and spacing as per OEM standards (Ashtech, Macawber, Clyde Bergemann, etc.)
Lubrication options: Sealed-for-life or grease-packed as per site demand

Why Choose CMECH Submerged Idlers?

Precision Fit for submerged chain tracks — avoids misalignment
Hardened bearing surface zones for increased wear resistance
Custom-built with flange & shaft assembly for direct integration
No jamming under thermal expansion due to guided axial tolerance
Field-tested in NTPC, Tata Power, JSW, and other thermal utility setups

Optional Enhancements:

316L stainless steel variants for higher corrosion resistance
Surface coatings for enhanced ash-slurry performance
Non-metallic wheel options for isolated applications

Let CMECH Support Your Bottom Ash Systems

Improve conveyor uptime, reduce idler jamming, and extend overhaul cycles.Ask for drawings, custom configurations, or drop-in replacements