National Bulk Equipment, Inc.


Flexible Screw Conveyors

In-Use Advantages

Flexible Screw Conveyor for Dry Bulk Materials

The NBE line of application-specific flexible screw conveyors and hoppers is built to ensure power, performance, and longevity in harsh applications, in demanding environments, and in extreme duty cycles. NBE systems are highly configurable; enabling the design of a flexible screw conveyor, hopper, or combination system that is particular to the requirements of each application. NBE flexible screw conveyors are expertly specified, including: material testing, controls, and integration. Specify NBE for process-critical flexible conveyor systems, not consumable commodities.

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Features & Integration Guide

Gear Drives & Motors:
Optimal output torque and motor horsepower combine to bring maximum power and efficiency to the most challenging flexible screw conveying operations.

> Gear Drives & Motors

Gear Drives & Motors

Optimal output torque and motor horsepower combine to bring maximum power and efficiency to the most challenging flexible screw conveying operations. NBE motor and gear drive specifications turn difficult material types, capacity requirements, and conveying distances from problems to production.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Gear Drive and Motor

Discharge Head:
Formed-and-welded, 12 gauge 304 stainless steel construction; continuous-weld seams are ground to a No. 4 finish and hand-burnished to ensure no gaps, joints, bolts, or material buildup.

> Formed-and-Welded Construction

Formed-and-Welded Discharge Head Construction

Continuous-weld seams, ground to a No. 4 finish, are hand-burnished to ensure the 12 gauge, 304 stainless steel discharge head has no gaps, joints, bolts, or resulting material buildup common with bolt-together, sheet metal construction of commodity discharge head designs.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Discharge Head Construction

Flexible Screw Materials of Construction & Flight Design:
The principle of helicoid motion as a conveying method is widely applied; yet, NBE has advanced this science with performance-proven flexible screw materials of construction and process-specific flight designs that ensure sustained conveying, at designed capacities, of even the most demanding materials and bulk densities.

> Flat Wire Flights (Regular & Wide-face)
flat-wire-flights

Flat Wire Flights (Regular & Wide-face)

Recommended for use with lightweight material types, including those that are highly aerated, powdered, or fluidizing; material is typically free- to semi-free flowing.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Flat Wire Flights
Flexible Screw Specifications:
Flat Wire Type (Regular & Wide-face) Serial No. Diameter & Pitch (in.) Flight Dimensions (in.)
Recommended for use with lightweight material types, including those that are highly aerated, powdered, or fluidizing; material is typically free- to semi-free flowing. 250-FW 1.75 OD x 1.00 ID x 1.75 pitch .1875 x .375
350-FW 2.375 OD x 1.50 ID x 2.00 pitch .1875 x .4375
350-HDFW 2.375 OD x 1.50 ID x 2.00 pitch .250 x .4375
450-FW 3.50 OD x 2.00 ID x 3.50 pitch .250 x .750
450-HDFW 3.50 OD x 2.00 ID x 3.50 pitch .375 x .750
450-WFFW 3.625 OD x 1.375 ID x 3.25 pitch .1875 x 1.125
500-FW 4.00 OD x 2.00 ID x 4.00 pitch .250 x 1.00
650-FW 5.50 OD x 2.50 ID x 5.50 pitch .375 x 1.50
850-FW 7.50 OD x 2.50 ID x 7.50 pitch .375 x 2.50
flat-wire-flights
> Beveled Wire Flights (Regular & Wide-face)
beveled-wire-flights

Beveled Wire Flights (Regular & Wide-face)

Recommended for use with flow-resistant material types, including those that are sticky, tend to pack, smear, cake, or crumble; material is typically semi-free to sluggish flowing.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Beveled Wire Flights
Flexible Screw Specifications:
Beveled Wire Type (Regular & Wide-face) Serial No. Diameter & Pitch (in.) Flight Dimensions (in.)
Recommended for use with flow-resistant material types, including those that are sticky, tend to pack, smear, cake, or crumble; material is typically semi-free to sluggish flowing. 350-KE 2.375 OD x 1.50 ID x 2.00 pitch .250 x .4375
450-KE 3.50 OD x 2.00 ID x 3.50 pitch .250 x .750
450-HDKE 3.50 OD x 2.00 ID x 3.50 pitch .375 x .750
450-WFKE 3.625 OD x 1.375 ID x 3.50 pitch .1875 x 1.125
500-KE 4.00 OD x 2.00 ID x 4.00 pitch .250 x 1.00
500-HDKE 4.00 OD x 2.00 ID x 4.00 pitch .375 x 1.00
650-KE 5.50 OD x 2.50 ID x 5.50 pitch .375 x 1.50
850-FW 7.50 OD x 2.50 ID x 7.50 pitch .375 x 2.50
beveled-wire-flights
> Round Bar Wire Flights
round-wire-flights

Round Bar Wire Flights

Recommended for use with highly abrasive material types, including those that are granular, irregular shaped, or flakes or pellets; material is typically semi-free to sluggish flowing.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Round Wire Flights
Flexible Screw Specifications:
Round Bar Wire Type Serial No. Diameter & Pitch (in.) Flight Dimensions (in.)
Recommended for use with highly abrasive material types, including those that are granular, irregular shaped, or flakes or pellets; material is typically semi-free to sluggish flowing. 250-RW 1.50 OD x 1.00 ID x 1.75 pitch 0.250
350-RW 2.25 OD x 1.50 ID x 2.00 pitch 0.375
350-HDRW 2.375 OD x 1.50 ID x 2.00 pitch 0.438
450-RW 3.00 OD x 2.00 ID x 2.50 pitch 0.500
450-HDRW 3.50 OD x 2.00 ID x 3.25 pitch 0.750
500-RW 4.00 OD x 2.875 ID x 4.00 pitch 0.563
650-RW 5.125 OD x 3.625 ID x 4.875 pitch 0.750
round-wire-flights
> Square Bar Wire Flights
square-wire-flights

Square Bar Wire Flights

Recommended for use with high-bulk density material types, including those that are highly abrasive; material can be free-, semi-free, to sluggish flowing.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Square Wire Flights
Flexible Screw Specifications:
Square Bar Wire Type Serial No. Diameter & Pitch (in.) Flight Dimensions (in.)
Recommended for use with high-bulk density material types, including those that are highly abrasive; material can be free-, semi-free, to sluggish flowing. 350-SB 2.375 OD x 1.50 ID x 2.00 pitch 0.375
450-SB 3.00 OD x 2.00 ID x 2.50 pitch 0.500
square-wire-flights

Screw Conveyor Casings Materials of Construction:
Double the thickness of typical casings, NBE UHMW or polypropylene casings protect crucial process operations. For harsh application requirements or harsh environments, NBE 11 gauge stainless steel or carbon steel casings ensure reliable, long-term operation.

> UHMW-Polyethylene Casing
UHMW

UHMW-Polyethylene Casing

Provides the highest impact strength and tensile strength of any thermoplastic; is non-corrosive, temperature resistant, FDA and USDA approved, and aids material flow.

Casing Specifications:
UHMW-Polyethylene Serial No. Diameter (in.) Bend Radius (ft.)
Provides the highest impact strength and tensile stength of any thermoplastic; is non- corrosive, temperature resistant, FDA and USDA approved, and aids material flow. 250 2.50 OD x 2.00 ID 6
350 3.50 OD x 3.00 ID 12
450 4.50 OD x 4.00 ID 20
500 5.00 OD x 4.50 ID

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

UHMW
> Polypropylene Casing
polypropylene

Polypropylene Casing

For tough materials and tough duty cycles that require large-diameter casings; NBE polypropylene casings provide an excellent alternative to UHMW-PE casings.

Casing Specifications:
Polypropylene Serial No. Diameter (in.)
Provides an alternative to UHMW-PE for applications with large-diameter casing requirements. 650 6.625 OD x 6.00 ID
850 8.625 OD x 8.00 ID

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

polypropylene
> Type 304 Stainless Steel Casing
stainless-casing

Type 304 Stainless Steel Casing

Provides excellent corrosion and contamination resistance relative to carbon steel casing; is FDA and USDA approved; inherent rigidity enables longer casing runs between supports than UHMW, simplifying installation.

Casing Specifications:
Type 304 Stainless Steel Serial No. Diameter (in.)
Provides excellent corrosion and contamination resistance relative to carbon steel; is FDA and USDA approved; rigidity enables longer runs between supports than UHMW. 250 2.50 OD x 16
350 3.50 OD x 12
450 4.50 OD x 12
500 5.00 OD x 11
650 6.625 OD x 11
850 8.625 OD x 11

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

stainless-casing
> Carbon Steel Casing
carbon-steel-casing

Carbon Steel Casing

Provides an economical alternative to thermoplastic materials in large-diameter applications when FDA or USDA compliance is not necessary, and where high-strength performance and corrosion resistance are not required.

Casing Specifications:
Carbon Steel Serial No. Diameter (in.)
Provides high-strength performance where corrosion resistance is not required; an economical alternative when FDA or USDA compliance is not necessary. 250 2.50 OD x 16
350 3.50 OD x 12
450 4.50 OD x 12
500 5.00 OD x 11
650 6.625 OD x 11
850 8.625 OD x 11

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

carbon-steel-casing
> Inner Core
inner-core

Inner Core

For improving material flow efficiency; the inner core, placed through the length of the screw axis, prevents reverse flow or flooding of highly aerated material, easily fluidized material, or material being conveyed up extreme inclines.

Inner Core Specifications:
UHMW-Polyethylene Serial No. Outside Diameter (in.)
For improving material flow efficiency; the inner core, placed through the length of the screw axis, prevents reverse flow or flooding of highly aerated material, easily fluidized material, or material being conveyed up extreme inclines. 250 .6875 OD, inner core
400 1.875 OD, inner core
500 1.875 OD, inner core
650 2.32 OD, inner core, flat wire only
650 2.96 OD, inner core, round wire only
850 2.96 OD, inner core, flat wire only
850 2.96 OD, inner core, round wire only

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

inner-core

Material Hopper Design & Construction:
Accurate, repeatable, and reliable downstream material supply begins at the hopper. NBE flexible screw conveyor hoppers are designed with a flangeless conveyor intake that ensures consistent infeed of material to the flexible screw conveyor; eliminating the bridging, ratholing, and sporadic material supply common with flange-style designs.

> Process-specific Hopper Design
hopper-design

Process-specific Hopper Design

Accurate, repeatable, and reliable downstream material supply begins at the hopper. NBE hopper designs have steep-slope sidewalls, sheer-drop material feed guides, and a flangeless conveyor intake that draws in material flow and eliminates the bridging, ratholing, and cleaning access problems associated with typical flange-style designs.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Flat Wire Flights
hopper-design
> 12, 10, and 7 gauge Stainless Steel Construction
heavy-gauge

12, 10, and 7 gauge Stainless Steel Construction

12 gauge, 304 stainless hopper walls; 10 gauge, 304 stainless hopper legs; 7 gauge, 304 stainless component stand-offs; continuous-weld seams, ground to a No. 4 finish then hand-burnished to improve material release; and a 1/4-inch diameter, resistance-welded, stainless steel grate. NBE hoppers are built to specs that will keep your process running; without a doubt.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Flat Wire Flights
heavy-gauge

Controls & Integrated Automation:
Whether a stand-alone process operation, or as a vital component in a comprehensive processing line, NBE flexible screw conveyors can be built with single-unit controls, or with integrated automation tied to a central SCADA system. NBE controls and integrated automation capabilities push control functionality farther out, and deeper into equipment operations to optimize throughput and deliver improved process efficiency and operator safety.

> Controls & Integrated Automation

Controls & Integrated Automation

Whether as a stand-alone process operation, or as a vital component in a comprehensive processing line, NBE flexible screw conveyors can be built with single-unit controls, or with integrated automation tied to a central SCADA system. NBE controls and integrated automation capabilities push control functionality farther out, and deeper into equipment operations to optimize throughput and deliver improved process efficiency and operator safety.

For a detailed Flexible Screw Conveyors specifications sheet PDF, click here:

Screw Conveyor Literature

Screw Conveyor Automation