Bearing Load; System Design - Total Control Systems 700-20 Engineering Manual

K) Bearing Load
The product viscosity will have a direct relationship on the flow rate of the system. The
following chart is a flow meter selection guide based on the relationship of viscosity and
flow rate. The bearing material is illustrated according to maximum bearing load allowable.
In the following flow chart, please choose the system flow rate and the product viscosity.
Then select the proper bearing sleeve material to identify the flow limitations of the flow
meter. If the system flow rate and viscosity do not meet your requirements, choose the next
size of flow meter or reduce the flow rate.

SYSTEM DESIGN

Meter Selection
The flow meter must be carefully chosen from the Meter Selection factors in the Engineering
Manual. The meter must be selected based on the operating system and product characteristics.
System variables include flow rate, temperature and pressure. The product characteristics
include the material compatibility, lubricity, viscosity, suspensions, pH, and whether the product
can congeal, crystallize or leave a dry film. Failure to select the correct flow meter may result in
system failure or serious injury.
Air Elimination
In any system that the tank may be completely drained or multiple products manifold into one
metering system, the possibility of air being present increases. The solution is an air or vapor
eliminator located before the flow meter to vent the air or vapor from the system before it can be
measured. Air or vapor elimination is required for all weights and measures regulatory
approvals in custody transfer applications.
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