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In some applications, it is necessary to equip the load cells with additional structures that make the connection between the load and the support point through the load cell. These structures are known as the Tank Weigh System.

Purpose of use: An Tank Weigh System is a supplementary structure, which is sandwiched between the load cell and the actual load, and whose purpose is:

  • Accommodate the structure that is the base or bench (Normally a concrete or metal structure anchored to the ground).
  • Accommodate the structure that supports the load (silo, tank, hopper, etc ...).
  • Transmit the structure loads to the load cell, to allow the reading of the weight.
  • Limit the mobility of the supports.
  • Protect the structure from unwanted forces.
  • Facilitate the exchange and replacement of the load cell in case of failure.
strong>Parts of the Tank Weigh System: A Tank Weigh System consist of the following parts: Degrees of freedom. Limiting arm There are mainly 2 types of Tank Weigh System according to their degrees of freedom in plane:

  • Tank Weigh System without limiter arm. They have 4 degrees of freedom in plane.

  • Tank Weigh System with limiter arm. They have 2 degrees of freedom in plane. The horizontal stress limiter arm absorbs mobility in one direction and halves the mobility in the plane of the Tank Weigh System.

This is convenient because, as mentioned before, one of the functions of the Tank Weigh System is to reduce or limit the mobility of the supports and protect the structure from unwanted forces.

Although we are not interested in creating a system of hyperstatic and rigid supports with these Tank Weigh System, it is important to address the characteristics of each installation to minimize the effect of unwanted forces.

We call unwanted forces, those that can distort the reading of weight, or that can even compromise the safety of the installation: lateral forces due to wind, blows produced by mobile structures or machinery, or other external agents.

Through the correct combination of these 2 types of Tank Weigh System in an installation, we will obtain the optimal arrangement for weighing safely and efficiently.

Tank Weigh System floor layout Depending on the type of silo, tank or hopper and the number of feet or supports that it has, the arrangement of the Tank Weigh System can vary. Figures 1, 2, 3 and 4 show the plan view of some examples:

  • Figure 1. Round silo with 3 supports, arranged at 120° radially. All Tank Weigh System with limiter arm.
  • Figure 2. Round silo with 4 supports, arranged at 90° radially. 3 Tank Weigh System with limiter arm.
  • Figure 3. Silo or square tank with 3 supports, arranged at 120°. All Tank Weigh System with limiter arm.
  • Figure 4. Silo or square tank with 4 supports, arranged at 90°. 3 Tank Weigh System with limiter arm.

As a general rule, it will be necessary to install a number of Tank Weigh System with an arm equal to half of the silo brackets plus one, with rounding to the upper integer, with a minimum of 3 units. Example 1. A silo with 4 supports requires: Example 2. A silo with 7 supports requires: Other safety systems in working position

  • Silo tilt lock

The stop screws A and their corresponding lock nut prevent the plate from tilting if there are external forces that cause this movement.

  • Plate lifting block

Screw B prevents the silo from rising if there are external forces that cause this movement.

  • Installation block and load cell replacement. Both for the first installation of Tank Weigh System, and for a possible replacement of the load cell, the conical nut C allows the contact between the upper plate and the cell to be released to perform these tasks.