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Lower Operational Cost, Longer Up-Time, Rapid Replacement of Wear Components

With over 50 years of experience and know how, we understand how to build ash coolers that out last anything else on the market.  Our proprietary hard surfacing and tile overlays insure maximum life and operational uptime.  The extreme temperatures and abrasive characteristics wear down specific points on the rotor and housing much faster than other areas on the cooler.  Our replaceable inlet troughs are manufactured as a removable section that can quickly be removed and replaced, providing access for maintaining the high wear points on the rotor and housing, and reducing repair time and cost.

  • Environmentally Friendly & Economical Solution
  • Discharged Ash is Delivered as a Useful Product
  • Heat Energy can be Recovered from the ash
  • Highly Dependable and Safe to Operate
  • Low Operational and Maintenance Cost
  • Does not Require Hydration of the Ash


Blue cooler
HSC 24S-24-6 Single Scru Holo-Scru Cooler
Ash Cooler
HSC 30D-24-6 Twin Scru Holo-Scru Cooler


Holo-Scru™ coolers are the best solution for efficiently cooling of hot ash and some inert material such as sand.


Applications include cooling bottom ash, fly ash, gasification solids, and incinerator ash.  Fly ash and bottom ash are the two most common applications, and both have significant value when cooled indirectly in a Holo-Scru™.   Indirectly cooling fly ash ensures the maximum product valve is retained when the end use is for cement-based products.  Indirectly cooling bottom ash avoids the environmental problems created by the leachate in drying beds and eliminates the need for ash impoundment ponds.  Bottom Ash in the dry form produced by indirect cooling, is considered a valuable product that is in high demand for cement and road construction.

Larger boiler designs require larger ash handling capacities. Often single screw designs just can’t handle the required capacity. Holo-Scru™ ash coolers can be manufactured in single, twin and quad screw configurations with rotor sizes from 8 to 48 inches in diameter.

Holo-Scru™ ash coolers operate similarly to a traditional heat exchanger.  The hot ash begins to cool immediately on contact with the water-cooled screw flighting and rotor shaft.  The housing is also water-jacketed and cooled to maximize the usable heat transfer surface area.  The cooling is indirect meaning the cooling water does not directly mix with the ash, and the maximum value of the ash is retained.   Ash cooling™ screws are typically designed to handle boiler ash with a screw entry temperature of up to 1800° F. Ash is typically cooled down to 400° F before being discharged, and for bagging operations, it can be cooled even lower as required.

Holo-Scru™ ash coolers can be customized to meet your needs.  We offer a variety of standard options including:

  • Replaceable housing Inlet Sections
  • Hard Surfacing on the flighting
  • Replaceable hard surfacing tiles on the rotor
  • Quick change-Out wear components
  • Thermal Spray Abrasive Resistant Coatings
  • Conic Inlets for reduced wear
  • Tubular or U-Trough Housings

Many of the options, like our replaceable inlet sections and abrasive resistant hard surfacing have been developed specifically to increase the life of the cooler. The inlet section of the Holo-Scru™ ash cooler is subjected to the greatest pressure and abrasion. In most instances, it is the first part of the Ash cooler to erode.  Often it will need to be replaced before significant wear is visible elsewhere on the rotor.  Including a removable and replaceable section of solid flighting which can be quickly removed and replaced, reducing repair time and maintenance cost.  From weld on hard surfacing to replaceable wear tiles, we have developed the right materials to withstand the most abrasive ash.

CustomerApprox. CapacityModel No.Temp Range
ABT (UK) Ltd.9,500 lb/hrHSC 24-20-5, 1500°F – 300°F
ACE Cogeneration3,000 lb/hrHSC 12-16-4, 1600°F – 300°F
Air Products3,000 lb/hrHSC 12-16-4, 1700°F – 350°F
Alstom Power (ABB)9,500 lb/hrHSC 24-20-6, 1650°F – 250°F
Babcock and Wilcox10,000 lb/hrHSC 24-20-5, 1500°F – 300°F
Beaumont Birch Co.7,500 lb/hrHSC 24-10-5, 1500°F – 250°F
Berlie Technologies16,000 lb/hrHSC 24-20-5, 1500°F – 300°F
Coal Technology Corp.12,500 lb/hrHSC 36-10-6, 1600°F – 300°F
City of Los Angeles1,350 lb/hrHSC 9-15-3, 1500°F – 300°F
Denver Equipment1,000 lb/hrHSC 7-10-2, 1500°F – 300°F
Foster Wheeler USA Corp.4,000 lb/hrHSC 18-20-4, 1600°F – 200°F
GDC Engineering3,500 lb/hrHSC 12-20-3, 1500°F – 300°F
GWF Power Systems3,000 lb/hrHSC 12-16-5, 1600°F – 250°F
Heyl and Patterson1,200 lb/hrHSC 9-10-3, 1500°F – 300°F
Kellogg Co.20,000 lb/hrHSC 36-20-6, 1600°F – 250°F
Pine Mountain34,500 lb/hrSSC 48-43-8, 1000°F – 300°F
Pyropower3,500 lb/hrHSC 12-15-3, 1400°F – 300°F
Reilly Industries4,000 lb/hrHSC 20-20-4, 1500°F – 300°F
Ridge International3,000 lb/hrHSC 12-15-3, 1500°F – 200°F
Rollins Environmental4,500 lb/hrHSC 18-22-4, 1400°F – 200°F
RUST Environmental9,500 lb/hrHSC 24-20-5, 1550°F – 300°F
Separation and Recovery Sys9,500 lb/hrSSC 12-20-2, 1400°F – 300°F
Southern Company Services,2,500 lb/hrHSC 12-16-3, 1500°F – 300°F
Tampella Power Co.9,500 lb/hrHSC 24-20-5, 1500°F – 300°F
TUV Industry Services.5,000 lb/hrHSC 24-16-5, 1600°F – 300°F
ACE Cogeneration5,000 lb/hrHSC 24-16-5, 1600°F – 300°F
Westinghouse4,500 lb/hrHSC 18-18-4, 1500°F – 300°F
Model Number / Size Key:

“XX – YY – ZZ, Style (SSC or HSC)” 

XX = Nominal Outside Diameter of flights in inches (i.e. “24” is a 24-inch or 610mm diameter screw).

YY = Screw rotor length in feet (i.e. “20” is a 20-feet or 6.1m length screw rotor, not including the shafts).

ZZ = Pitch of the screw flights in inches (i.e. “6” is a 6-inch or 152mm screw pitch).

SSC = Rotor(s) with solid flights. No heat transfer medium is circulated through the flights.

HSC = Rotor(s) with hollow flights. Heat transfer medium is circulated through the flights for maximum heat transfer surface area.


Read through BCR’s technical literature to discover our difference.