Engineered Design

The WEBA design philosophy is simple:

To provide you with a total solution for problems traditionally associated with transfer points.

There is no doubt that the transfer chute is one of the most overlooked components in any bulk materials handling installation, especially since this relatively low-cost item can be the source of a number of major problems.

Armed with information gathered from flow studies, on-site investigations and extensive operational experience, the WEBA team set about designing a transfer chute which would eliminate the problems associated with conventional types of transfer chutes. This led to the birth of the award-winning patented WEBA transfer chute system.

Design Criteria for WEBA Chutes

The design criteria for bulk solids transfer chutes are based largely on steel chutes which may be fitted with steel alloys, ceramic or rubber linings to reduce wear and costs and facilitate maintenance.

Assuming material characteristics are known, the design of chutes depends on the following factors:

  1. ​​​​​Material trajectory into the chute
  2. Material flow from the initial impact area​​​​​
  3. Material flow through the chute​​​​​
  4. Material flows through the discharge area​​​​​

Structure of WEBA Chutes

Visual evidence including video photography indicates that material flows through the WEBA chutes in a flow pattern referred to as “the supertube”. This flow structure results in the elimination of a number of problems experienced in steel-lined chutes.

Figure 1 General Layout of a Reverse Flow Weba Chute

Advantages of WEBA Chute Engineered Design

Based on the operational experience of a large number of WEBA chutes worldwide, it can be concluded that retrofit and new projects can benefit from integrating the WEBA chute design into their transfer systems.

These advantages include:

  1. Frictional effects are less effective in WEBA chutes compared to normal steel chutes. In conventional steel chutes material slides in contact with the liners, while in WEBA chutes material flows in the form of a “supertube” and is not continuously in contact with stationary material
  2. Due to material essentially flowing on material, wear of steel liner components is significantly reduced, resulting in much reduced maintenance and the associated downtime and costs
  3. Due to the action of material impacting on material and material moving over like material, the degradation of the material is reduced compared to conventional chutes as is the generation of dust
  4. The ability to control the velocity, flow direction and cross-sectional area at the discharge ensures a flow which is similar to what is required for example, in feeding belt conveyors. The result is lower belt wear, degradation of material, and spillage problems at the discharge.
  5. A number of factors which require design in conventional chutes are eliminated. These include the necessity of determining frictional factors which are dependent on bed depth, and the calculation of the effects of drop or free fall heights in the chute
  6. The material collected between the wear plates reduces and absorbs sound, reducing the external noise levels of WEBA chutes