| What is a Captive Acceleration Tube? |
| The Captive Acceleration Tube [C.A.T.] is a devise used at the inlet of the pump to assure consistent inlet pressure. It requires a positive inlet pressure to the pump. It does not operate with negative suction or correct for starvation [lack of sufficient liquid to the pump]. The C.A.T. is typically used in systems with booster pumps, long feed lines and high temperature liquids requiring boosted inlet pressures. The devise is relatively simple, but has gone through years of testing and field performance to prove its success in virtually eliminating cavitation. It is a specially designed hose that stores liquid energy and releases it as requried to fill the pumping chambers with each stroke. Using a pressure transducer to take accurate readings of the inlet pressure in a system with cavitation, you will notice peaks and valleys in the pressure readings. A pulsation dampener will help reduce the peaks, but only the C.A.T. will handle both the peaks and valleys and deliver a smooth, consistent inlet pressure.
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| What is Cavitation? |
| Cavitation is the formation and collapse of vapor bubbles in the
liquid being pumped. The energy released from the collapse of these
bubbles during the suction stroke causes erosion to the interior
surfaces of the pump. Metal parts become pitted and elastomers can
appear frayed or torn. This condition can be the result of excessive
liquid temperature, high vapor liquids, long feed lines, spiking by-pass valve
or excessive turbulence in the supply tank. A pressurized pump inlet and a C.A.T. installed at the pump inlet will help maintain a consistent inlet pressure to the pump. Seals and Valves are the primary parts affected by cavitation, however, sleeves and cylinders will also show pitting. With severe or prolonged cavitation a hammering type vibration develops and the crosshead section of the plunger rods and connecting rods can be weakened. Your plumbing is also affected. Cavitation should be corrected as soon as detected.
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