Horizontal end suction pumps of Neptune NC series

TECHNICAL SPECIFICATION

• Capacity – 20-1,600 m3/h
• Head – 9-250 mlc
• Medium – fresh water, sea water and dredging water with abrasive particles

Impeller

The impeller design can be fully adapted to the kind of liquid to be pumped. By means of pressure-leveling holes, the impeller is axially relieved. The impeller is fixed on the shaft cone, which is a great advantage with diesel drive. The cone is designed to enable a very easy disengaging of the impeller.

Pump casing

The liquid velocities in the pump have been kept very low, which results in minimum wear. The flanges may be drilled according to DIN or ASA standards. The pressure flange may be fitted in 4 positions with intervals of 90°. The sealing between pump casing, suction cover and casing cover with stuffing box is obtained by “O”-rings.

Pump shaft

Standard pump design involves a ground stainless steel shaft (according to DIN 4122), protected by a specially treated shaft sleeve, also made of stainless steel (AISI 304). Pump shaft and bearings are enclosed in a ball bearing cartridge, which enables a very quick replacement of the shaft and bearings unit. Moreover, this design enables an accurate axial adjustment of the impeller, which is an advantage with open impellers, equipped with a wearing plate. The front bearing is protected against the penetration of water by a rotating disk-shaped water flinger.

Packing

The pump of standard design is equipped with an easily accessible stuffing box with split gland. Gland bolts and nuts are made of stainless steel. Many different gland arrangements are possible. Moreover, simple and twin mechanical seals can be built in.

Materials

• cast-iron
• nodular cast-iron
• ni-resist
• bronze 90-10, 88-10-2
• aluminiumbronze
• monel metal
• stainless steel.

Nijhuis Pompen company has the ability to manufacture the Neptune series pumps in a special design with a capacity of up to 30,000 m³/h and water head up to 90 m.