General
The DICKOW-Standard pumps, series NKXs according to EN 733, are designed as centrifugal pumps of light duty for handling heat transfer media.
Dimensions and performance range comply with the requirements of EN 733. Thus, the performance range is subdivided such that best efficiency is granted at all service conditions.

Application
The NKXs pumps will be applied as circulating pumps in industrial heating plants. The performance range covers capacities up to 400 nf/h and differential heads up to 90 mLC in 50 cycles service.

The maximum allowable operating temperature PT is 340°C without additional cooling. The NKXs-pumps with the single acting N10q- seals can be applied when handling HTM with boiling pressure at operating temperature below the atmospheric pressure (<1 bar abs).

The DICKOW® medium duty pump is designed for handling liquids in the chemical and petrochemical industry, in refineries, for heat transfer liquids etc.

Dimensions and performance range are developed in accordance to EN 22858 (ISO 2858). The whole range is so subdivided that for all service conditions the best efficiency is guaranteed. The maximum capacity goes up to 900 m³/h or 3960 US gpm.

With a wide selection of materials and shaft sealing systems they are suitable to handle nearly all kind of liquids which are usual in the above mentioned industries. For example we call light fuels (all kinds), acids, lye, solvents, hydrocarbons, heat transfer liquids, heavy fuel, liquid sulphur, melted plastics, bitumen etc.

For handling hot water above 190 ºC (375 ºF), our pump types NHL are available.

Relevant documents on request.

Dickow NHX hot water circulation pumps have been developed for medium and large size heating plants, for calendars, presses, large buildings and similar applications which require temperatures > 140 °C (284 °F). The patented cooling and degassing system ensures cooler temperatures and a stable fluid film at the seal faces allowing for more reliable operations. The NHX does not require any external water cooling. The sleeve bearing behind the impeller reduces the radial loading seen on the pump shaft. NHX pumps can be offered for temperatures up to 220 °C (428 °F) and operating pressures of 40 bar (580 psi). Maximum capacity is 1,400 m 3 /hr (6,160 gpm) and a max differential head of 220 m (722 ft) is possible.