FAQs: Screw Auger

Or-Tec Shaftless Screw Auger for Sludge, Screenings & Difficult-to-Convey Materials

The Or-Tec Shaftless Screw Auger is a shaftless screw conveyor designed to transport dewatered sludge, screenings, solid waste, food processing byproducts, paper mill waste, and other difficult-to-convey materials. Available in horizontal, inclined, vertical, and reversing configurations, the Or-Tec Screw Auger provides reliable material handling with no intermediate bearings, reducing the risk of blockages and minimizing maintenance requirements.

• Shaftless solids conveying system: The Or-Tec Screw Auger is a shaftless screw conveyor designed to transport sludge cake, wastewater screenings, solid waste, and other difficult-to-convey materials.
• Designed for wastewater and industrial applications: It is commonly used in municipal wastewater treatment plants, industrial facilities, food processing plants, and paper mills where dependable solids conveying is required.

• Shaftless conveying design: The Or-Tec Shaftless Screw Auger uses a shaftless screw design with no intermediate bearings inside the conveying area.
• Reduces common blockage points: Eliminating intermediate bearings removes locations where rags, stringy materials, and sludge commonly accumulate, helping reduce blockages and maintenance requirements.
• Reliable solids handling: The auger is designed to convey dewatered sludge cake, wastewater screenings, and other difficult-to-convey materials with dependable performance.

Feature	Specification
Conveyor Type	Shaftless Screw Auger
Installation Options	Horizontal, Inclined, Vertical
Optional Configuration	Reversing screw with multiple discharge points
Construction	Stainless steel trough, supports, covers & fasteners
Screw Materials	AISI 304 SS, 316 SS, or epoxy-coated hardened carbon steel
Intermediate Bearings	None
Typical Speed	29 RPM
Diameter Range	6"-20"
Applications	Sludge Cake, Screenings, Food Processing, Paper Mills, Industrial Materials

• The Or-Tec Screw Auger uses a shaftless screw design with no intermediate bearings inside the conveying area.
• Reduced blockages and maintenance: Eliminating intermediate bearings removes common obstruction points where stringy materials, rags, and sludge can accumulate, helping reduce blockages and maintenance requirements.

• Designed for difficult materials: Or-Tec's Screw Auger is specifically designed to convey dewatered sludge cake, wastewater screenings, solid waste, food processing byproducts, and paper mill waste.
• Handles challenging solids: Its shaftless design makes it especially suitable for materials that are sticky, fibrous, or prone to wrapping, where conventional screw conveyors may experience plugging.
• Flexible installation: Available in horizontal, inclined, and vertical configurations, the system can be adapted to a wide range of wastewater and industrial facilities.

• Dewatered sludge cake
• Wastewater screenings
• Solid waste
• Food processing byproducts
• Paper mill waste
• Industrial materials that are difficult to convey

Its shaftless design makes it especially suitable for materials that are sticky, fibrous, or prone to wrapping.

• Flexible installation options: The Or-Tec Screw Auger is available for horizontal, inclined, and vertical installations.
• Multiple discharge points: It can also be supplied with reversing screws and knife-gate valves to create multiple discharge points, allowing operators to load multiple containers or disposal vehicles safely and evenly.

• Corrosion-resistant construction: The trough, supports, covers, and fasteners are manufactured from stainless steel for corrosion resistance and long service life.
• Material options: Depending on the application, the screw itself can be manufactured from AISI 304 stainless steel, AISI 316 stainless steel, or epoxy-coated hardened carbon steel.

• Low-maintenance operation: No. The Or-Tec Shaftless Screw Auger is designed for low maintenance operation.
• Simplified conveying design: Because there are no intermediate bearings in the conveying zone and no mechanical components directly contacting the conveyed material, maintenance requirements are reduced compared to many conventional screw conveyor designs.

• Reliable solids conveying: Wastewater treatment plants choose the Or-Tec Shaftless Screw Auger because it provides reliable conveying of sludge cake and screenings, supports horizontal, inclined, and vertical installations, and offers low maintenance and low capital cost.
• Operational flexibility: Optional reversing screws and multiple discharge points provide additional operational flexibility for solids handling systems.

Reference capacities vary by auger diameter and installation angle.

Diameter	Reference Capacity (0-15 degrees)	Reference Capacity (15-30 degrees)
6 in	52 cu ft/hr	28 cu ft/hr
9 in	105 cu ft/hr	60 cu ft/hr
10 in	245 cu ft/hr	136 cu ft/hr
12 in	385 cu ft/hr	210 cu ft/hr
16 in	805 cu ft/hr	455 cu ft/hr
20 in	1,575 cu ft/hr	910 cu ft/hr

• Typical operating speed: 29 RPM
• Horsepower range: 0.75-7.5 HP

Capacities are provided as reference values. Final sizing depends on the material being conveyed and project-specific operating conditions.

• Multiple discharge capability: The Or-Tec Shaftless Screw Auger can be supplied with reversing screws and knife-gate valves to create multiple discharge points.
• Improved operational flexibility: This configuration allows operators to load multiple containers or disposal vehicles safely and evenly from a single conveying system.
• Adaptable to plant layouts: Multiple installation configurations and discharge options provide a flexible solids handling solution for municipal wastewater treatment plants, food processing facilities, paper mills, and industrial operations.

• Municipal wastewater treatment plants
• Wastewater sludge handling systems
• Screening handling systems
• Food processing facilities
• Food packaging plants
• Paper and pulp mills
• Industrial manufacturing
• Solid waste handling systems
• OEM wastewater treatment equipment

Capability	Or-Tec Shaftless Screw Auger
Shaftless Screw Conveyor	Yes
Sludge Cake Conveying	Yes
Screenings Conveying	Yes
Difficult-to-Convey Materials	Yes
Horizontal Installation	Yes
Inclined Installation	Yes
Vertical Installation	Yes
Multiple Discharge Points Available	Yes
Reversing Screw Available	Yes
Intermediate Bearings Required	No
Stainless Steel Construction	Yes
304 or 316 Stainless Steel Screw Available	Yes
Low Maintenance	Yes
Typical Speed	29 RPM
Diameter Range	6-20 in

• Designed to transport sludge cake, screenings, and difficult-to-convey materials with reliable performance.
• Shaftless screw design eliminates intermediate bearings that commonly cause blockages in conventional conveyors.
• Available in horizontal, inclined, vertical, and reversing configurations to fit a wide range of plant layouts.
• Manufactured with stainless steel construction and multiple screw material options to suit municipal and industrial applications.
• Offers low maintenance, low capital cost, and dependable solids conveying for wastewater treatment and industrial processing facilities.