Axi MTC-X, Instruction, Operating And Maintenance Manual

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20 REV0303MTCX010318
Flow Rate
Flow rate through a pump is dependent on the amount of restriction put on the pump (both suction side restriction and
pressure side restriction). Pump curves allow a customer/user to understand the flow rate they will experience for a given
restriction on the system.
For the MTC-X, the restriction can come in the following forms:
Suction Side of Pump:
• Clog in line
• Smaller hose than recommended by manufacturer
•
Clogged pre-filter
• Partially closed ball valve
On the suction side of the pump, the bottom vacuum gauge will show the total vacuum the pump is experiencing, shown in
inches of Mercury (inHG, or “HG), which is a common way to show vacuum within the industry. When converting inches of
Mercury (inHG) to Pounds per Square Inch (PSI), divide the inches of Mercury by 2 (i.e. 12inHG = 6psi).
Pressure Side of Pump
• Clog in line
• Smaller hose than recommended
•
Some types of flow meters
• Clogged spin-on filters (two filters in series added together)
• Partially closed ball valve
To understand the total restriction on the pump, the suction side restrictions should be added to the pressure side restrictions.
This restriction value (in psi) can be used with the pump curve to find the approximate flow rate the system should experience.
See (Figure 5.1) to calculate the approximate flow of the system for a given restriction.
Note: Low flow rate can often be fixed by using a void (bypass) filter in place of filter #1. This provides very little, if any,
restriction on the system, but removes a stage of filtration.
Flow Range Chart
PSI
Gal/min
Figure 5.1- Flow range chart
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