Masterflex Pump FAQs

Masterflex FAQs

Flow Rates

What flow rates are attainable?
Our C/L® systems deliver flow rates from 0.002 to 37 mL/min.
L/S® systems deliver flow rates from 0.0006 to 3400 mL/min.
I/P® systems deliver flow rates from 0.012 to 13 LPM and
B/T® systems deliver flow rates from 0.3 to 45 LPM.

What flow precision can I expect?
You can obtain a flow precision of better than ±0.5% with calibrated flow systems. For other systems, you can obtain ±3% precision for general transfer applications.

Are measured volumes repeatable?
Volumes are repeatable with accuracies of ±0.25% or better using calibrated systems.

What is the effect of viscosity on flow?
All flow rates are based on water. Increasing the fluid viscosity will decrease the flow rate.

Pump Heads

What is the maximum pressure?
Depending on your choice of tubing, the maximum pressure is 40 psi (2.7 bar); nominal pressure is 25 psi (1.7 bar). Our PTFE pump head can operate at pressures up to 100 psi.

What is the maximum inlet pressure?
Typically 40 psi (2.7 bar), depending on tubing ID, wall thickness, and formulation. Our PTFE pump head can operate at pressures up to 100 psi.

What is the maximum suction lift?
The maximum suction lift is 29 ft H20.

Are check valves required?
No. Our unique designs eliminate this need.

Can MASTERFLEX pumps run dry?
Yes. They can pump gases, liquids, or mixed phases. Our PTFE pump head may overheat when run dry and should not be used to pump gases.

Are MASTERFLEX pumps self-priming?
Yes. They can develop a vacuum in excess of 26" Hg (660 mm Hg).

Are MASTERFLEX pumps positive displacement type pumps?
Yes. The flow rate with water is directly proportional to the rotor speed up to the maximum capabilities of the drive.

Are MASTERFLEX pumps nonsiphoning?
Yes. One roller is always squeezing the tubing closed, so you don’t get any backflow.

Can slurries or abrasive solutions be pumped?
Yes. The limitations are viscosity and particle size relative to selected tubing ID.

Why are so many pump heads and tubing sizes offered?
To provide maximum flexibility in achieving desired flow at optimum rpm.

Is flow reversible?
Yes. All specifications apply in either clockwise or counterclockwise rotation.


Is the tubing important?
The tubing is the pump chamber. The elasticity of the tubing provides suction lift; its strength provides pressure handling ability; its flexiblity determines pumping life; its bore determines the flow rate, and its wall thickness determines pumping efficiency.

What are the temperature ranges of a MASTERFLEX pump?
Optimum temperature range is from 32 to 104°F (0 to 40°C). The maximum temperature range is from ­100 to 460°F (­73 to 232°C) for tubing and from ­148°F to 230°F (­100 to 110°C) for the pump head.

What is the chemical resistance?
Depends on tubing style (see Tubing and Chemical Compatibility Table).

What determines tubing life?
Pump speed and pressure, tubing material and chemical compatibility, and abrasiveness of the liquid (media) being pumped. For life expectancy, see Tubing Life Technical Data.

What tubing formulation gives longest life?
NORPRENE®, PHARMED®, TYGON® LFL, silicone, TYGON silicone, C-FLEX®, TYGON, and VITON®, in that order. For more information, see Tubing Life Technical Data.

How does pump speed affect tubing life?
Tubing life is inversely proportional to pump speed. Minimum speed gives maximum life.

Is the tubing compatible for food and sterile applications?
Yes. Some tubing formulations meet NSF specifications and FDA and USDA requirements for food handling. Many can be sterilized. For more information, see specific tubing’s Formulation Specification Sheets.

Is the tubing difficult to replace?
No. The EASY-LOAD®, EASY-LOAD® II, High-Performance, cartridge, RAPID-LOAD®, and QUICK LOAD® pump heads make tubing changes quick and easy. With the Standard pump head, tubing is easy to change using the loading key provided.


Why are pump heads available without drives in the L/S, I/P, and B/T pump groups?
The modular concept lets you customize your system for flexibility and economy.

Can more than one pump head be used with a single drive?
Yes. Any number (typically two to four) can be stacked together in any combination using Standard or EASY-LOAD heads up to the maximum torque capability of the drive.

Are drive systems other than those shown in your catalog available?
Yes. Our Engineering Department can customize, design, or modify a drive or drive package to your specifications for quantity purchases and OEM applications. Call 1-800-MASTERFLEX.