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 uni-directional 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 environments

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

Submerged Overhanging Idler (SOI)

PCD	d/mm	p	q
400	19	24	83
400	22	27	92
400	26	32	107
566	30	36	113
560	34	42	127
566	36	42	136
650	42	50	155
511	30	36	113