GENERAL DESCRIPTION

CN Series are single stage centrifugal pumps, hydraulically balanced overhung impeller, simple volute casing, axial suction and radial discharge. Bearings are oil bath lubricated. The high standardization of the common parts simplifies spare parts storage. The bolting to the base plate through the casing feet together with spacer coupling, allow an easy disassembly of the rotating parts without disturbing the alignment and without disconnecting pipes and motor. UNI 2223-2229 NP 16 pipe flanges are used for standard construction. On request flanges can be drilled according to UNI NP 25, ANSI 150 RF or other standard.

OPTIONAL REALISATIONS

Following optional configurations, according to the service required, can be provided: semi open impeller for abrasive and high viscosity liquids, for liquids with suspended solids that can clog the impeller. Inducer to decrease the NPSH required value. Heated casing and stuffing box when the pumped liquid needs a working temperature constantly higher than that of the environment temperature. Cooled stuffing box for cooling the seal. Heavy duty service bearings when the working conditions overstress the bearing. Bearing cooling for high temperature. On request constant level oiler – Purge oil mist – Oil labirynt seals.

SEALS

The stuffing box dimension permits the interchangeability between packing and standard mechanical seals. The standard construction uses mechanical seal according to DIN; it is also possible to fit every kind of mechanical seal. Standard mechanical seal flushing is realized with internal recirculation from pressure side to seal chamber. It is still possible to realize every kind of flushing line in an execution similar to API 610 standard.

CONSTRUCTION MATERIALS

Standard constructions are in cast iron, carbon steel, stainless steel, on request we can realize other metallurgic combinations.