TriContinent C24000, Product Manual

Page: 135 / 144

Optimizing tubing performance
C-Series Product Manual
135
Optimizing tubing performance
There are two types of liquid transfer lines in a typical system: suction
and delivery .
• Suction lines transfer liquid from a vessel to the input port of the pump.
• Delivery lines transfer liquid from the output port of the pump to
another location (i.e., cuvette or test tube).
When selecting liquid lines, the parameters to pay attention to are tub-
ing I.D, length, material, secure port connection, and smooth ID transi-
tions.
Tubing I.D.
• Suction line I.D.
–
Too small will restrict flow causing the pump to cavitate.
–
Too large will generate additional priming requirements.
• Delivery line I.D.
–
Too small will cause additional back pressure and excessive liquid
velocity.
–
Too large may slow liquid velocity excessively and generate addi-
tional priming requirements.
Tubing length
• Suction line: excessive length may prevent the pump from priming and
introduce pressure drop that will restrict flow to the pump.
• Delivery line: excessive length will introduce back pressure, increasing
pressure at the pump.
Tubing material
• Suction line: soft tubing will collapse and pulse causing flow restriction,
blockage, and pump cavitation.
• Delivery line: soft tubing will expand and pulse causing flow fluctuations,
undermining the system's C.V.
Semi-rigid tubing such as Teflon® or L.D.P.E. is preferred for consis-
tent performance of the liquid transfer system.
Port connection
• Suction line: should be bubble tight to prevent introduction of micro air
bubbles into the pump input port.
• Delivery line: should be bubble tight to prevent leakage of liquid from the
pump output port.
Smooth ID transitions (contour)
Configurations should be used to prevent particle entrapment and mini-
mize flow turbulence. Particle entrapment may cause material carry-
over contamination. Flow turbulence may introduce additional back
pressure, affecting system performance.