UND III AE

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Introduction

The process pump line, model UND/III-AE is specifically designed to provide high quality performance for pumping services in general industries and in chemical processes that demand self-priming applications.

General Characteristics

  • Capacity: up to 350 m3/h (1540 GPM);
  • Total head: up to 120 m (394 ft);
  • Temperature: up to 260ºC (500 F);
  • Pressure: up to 2586 kPa (375 psi);
  • Effective suction head: 6 m (20 ft);
  • Casing molded in one piece with integrated self-priming chamber;
  • Suction retention valve not required;
  • Quick priming time;
  • Positive retention of liquid in the casing under siphon conditions;
  • Self–purging of vapors;
  • Project designed for back pull-out of roller bearings support;
  • Interchangeable parts with the UND/III model; and
  • External axial adjustment of the impeller.

Applications

  • Industrial collector wells/cisterns;
  • Dewatering of mines and galleries;
  • Chemical transfer;
  • Removal of water from vessel holds;
  • Unloading from water/fuelling trucks;
  • Petroleum transfer filter systems;
  • Aircraft supply; and
  • Column bottoms and reflux.

01

Design Features

1. Shaft and bearings for heavy-duty services The shaft is projected for minimum deflection, less than 0.002 inches (0.05 mm) on the sealing faces. The bearings are designed for long service life under strenuous operating conditions.

2. A compact casing design molded in one piece Eliminates the need for a separate priming chamber, air separator or valves. The discharge on centerline is self-ventilated. Back pull-out design.

3. Sealing flexibility SUPERBOXTM or CONEBOXTM or standard sealing chambers for maximum flexibility in order to withstand any type of service conditions.

4. Lubrication flexibility In addition to the normal splash system, allows for the adoption of lubrication by oil mist and alternatively grease lubrication.

5. Totally open impeller Recognized as the best option for services in industries that process-handle solids, viscous material, corrosives and abrasives. Back pumping blades help to minimize the pressure in the sealing chamber.

6. Ductile iron adapter  Resistance equal to carbon steel. Higher security guarantee.

02

Description and Illustration of the Priming Cycle

1. Casing filling, pump stopped:  For a good operation of self-priming the casing should be filled with sufficient volume of priming liquid required to entrain the air contained in the suction line.

2. Pump start-up: With the spin of the impeller the priming liquid assists the aspiration of the air contained in the suction tubing and it is pumped to the inside the priming chamber. The air is expelled while the priming liquid flows through the casing and returns to the eye of the impeller. As the priming liquid circulates, it re-entrains more air, creating a depression in the suction line which implies that the pumped liquid is then pushed upward into the tubing by the action of atmospheric pressure.

3. After the priming cycle has sucked up all the air in the Tubing, the liquid fills up the volute and priming chamber and then the effective pumping of the liquid begins.

4. Pump stopped: When the pump is not functioning, the liquid in the discharge tubing returns to the pump, leaving the priming chamber filled with sufficient liquid for the next priming cycle.

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