Glycol Mix and the Flow Correction Factor
If using glycol, it is FlowCon’s recommendation to check the graph below for an adequate flow correction factor. Such flow correction factor should be based on media temperature and the percentage of glycol.
How to read the Flow Correction Factor Graph:
- What is the % of glycol?
Select the curve appropriate for your selected water/glycol mixture. The mentioned percentage refers to the concentration of glycol in the fluid
- What is the media temperature in °C?
On the top scale, select the appropriate media temperature and then identify the intersection with the glycol mix curve
- What is the flow correction factor?
Draw a horizontal line from this intersection to the left axis and determine the specific gravity. This will correspond to the flow correction factor.
Glycol Mix Calculation Example
A 0°C media with 30% glycol should provide a required flow of 2.7 l/sec. Flow correction factor is determined to 1.045 (see orange lines in the graph above).
For a Diaphragm Design, e.g. FlowCon Green.3 DN40/50, a flow rate of 2.7 l/sec would equal setting 3.2. But with 30% glycol at 0°C, setting should be adjusted. The required flow is multiplied with the flow correction factor → 2.7 x 1.045 = 2.82 l/sec. Consequently, the valve should be set to 3.35.
For a Moving Cup Design, e.g. FlowCon K DN40/50, a flow rate of 2.7 l/sec would equal a F3C2466 stainless steel insert providing 2.78 l/sec. The required flow is multiplied with the square root of the flow correction factor → 2.7 x √1.045 = 2.76 l/sec. Still, the F3C2466 insert will be the valid choice.
Need more Information ?
Contact FlowCon for more information or help in how to determine your flow correction factor.