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Rodelta CNP (OH1)

Product Description:
The OH1, type CNP is an over hung end suction, volute casing, radially split pump with a back pullout design. These pumps are suitable for process applications in chemical process industries and refinery for handling corrosive acids, alkalies, hydrocarbons, etc. The impellers are offered with enclosed type and semi-open type depending on the application and pump size. Their delivery size ranges from 20 mm to 350 mm. The CNP is conforming DIN 24256 (EN22858) and ISO 2858.

For alternative specifications contact us.

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Rodelta CNP (OH1)


  • Conforming to DIN 24256 (EN22858) and ISO 2858
  • The pumps are offered with CE marking
  • Depending on the application, area classification ATEX certification possible
  • Back pull-out design
  • Generally conforming to API 610 and ISO5199 with deviations
  • Gland Packed / Mechanical Seal
  • Customization possible in vertical execution upon request
  • Foot and center line mounting options available
  • Jacketing arrangement for heating/cooling by steam or water


  • Delivery size up to 350 mm
  • Capacity up to 2500 m³ /hr
  • Head up to 225 m
  • Temperature up to (-) 50 °C to 350 °C


ISO 2858, DIN 24256 (EN 22858)


Chemical Process Industries, Petro Chemical, Nuclear, Refinery, Paper and Power Plants, etc. Pumps suitable for handling Corrosive Acids, Alkalies, Salt Solutions, Caustics, Hydro Carbons, Oils, Thermic Fluids, Liquefied Gases, Condensates, Viscous Liquids etc.

Constructional features:

The casing has axial suction and top center line delivery. Smooth hydraulic passages ensure high efficiency. Normal design is for foot mounted pumps. Centre line mounting for special applications are also available.

The impellers are of enclosed type and semi-open impellers can also be supplied. Hydraulic balancing of impellers is achieved either by back vanes or by balancing holes. The impellers are statically and dynamically balanced. Reliable fixing of the impeller on shaft is achieved by using Heli coil insert under impeller nut. To improve NPSH performance, inducer can be supplied.

The shaft is supported by two antifriction bearings to take residual axial thrust and prevent axial float or radial run out. It is fully protected from the liquid handled by means of a shaft sleeve and gaskets between impeller nut, impeller hub and shaft sleeve.

Stuffing Box:
The stuffing box is sealed by gland packing or by cartridge type mechanical seal. Conversion from gland packing to mechanical seal is achieved by changing some standardized parts. Re-machining of stuffing box is not necessary. Stuffing box cooling is provided for operating temperature 105°C for gland packed and 140°C for mechanical seal fitted pumps.

The bearings are oil lubricated. For high temperature (above 180°C) application, bearing oil cooling arrangement is provided. All pumps are provided with reinforced bearing arrangement as standard supply.

Direction of Rotation:
Clockwise viewed from driving end.

Pumps can be driven by electric motor or engine.

– ANSI B 16.1, CL 125 Flat Face: for Cast Iron/Bronze
– ANSI B 16.5, CL 150 Raised Face – for special metals viz. stainless steel, cast steel etc. Drilling as per DIN, ASA, BS EN etc. (Optional)


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  • Design standard DIN 24256, EN 22858, ISO 2858 DIN 24256, EN 22858, ISO 2858
  • Features OH1-Over hung end suction, volute casing, radially split design, back Pull-out
  • Capacity @ BEP Upto 2500 m3/hr Upto 11000 Gpm
  • Head Upto 225 m Upto 738 feet
  • Temperature range -50 to 350 °C -58 to 662 °F
  • Discharge pressure upto PN 16/PN 20 upto Class 125/150
  • Material (Casing/Impeller) Cast Iron, Bronze, SS, Duplex, Super Duplex, Hast alloy
  • Nozzle Orientation (suc/dis) Top Center-line discharge(self venting)
  • Standard Motor Sync. Speed 1000/1500/3000 rpm 1200/1800/3600 rpm
  • Options Gland packing / Mechanical Seal
  • Flange drilling standard BS EN/DIN/ANSI /ASA
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