N/A The intermediate shafts and the pump shaft are carried in sleeve bearings which are corrosion and abrasion resistant. The maximum space between the shaft guide bearings follows the recommendation of API 610.

The drive shaft is carried in two angular ball bearings. These bearings are grease lubricated and protected against shaft sealing leakage by two grease filled radial seal rings.

Several sleeve bearing options are available. E.g. for handling liquids with solids we can offer pure and wear resistant Silicon Carbide bearing sets.

N/A

• Mechanical seal acc. to API 682
• impeller- and casing wear rings

N/A The drive shaft is sealed against the atmosphere by a shaft sealing arrangement, located in the motor support lantern. The shaft sealing is not pressurized by the pump itself. Besides the standard gland packing with self-lubricating graphite ring, mechanical seals can also be applied. Retrofitting from packing to seal on site is possible without remachining any pump parts.

N/A Design
The chemical submersible pump NCT is a single-stage, single-flow volute casing pump with separate column pipe and discharge pipe. The hydraulic part of the pump is mounted inside of the vessel, the driving motor is located outside. All standard motors with normal shaft design can be used. No special shaft design is required. The motor shaft is connected with the pump shaft via an elastic coupling. By using spacer type couplings, service on ball bearings or on the available shaft sealing system can be performed without removing the motor. Submersible length according to customer's specification.

Volute casing
The volute casing is a one piece casting and bolted to the column pipe via the intermediate casing. In case the liquid temperature drops below the melting- or crystallization point, volute casings and tubes with heating jackets are available. For example: handling of sulphur liquid or viscose residuals or sump liquids.

Impeller
The standard design of the DICKOW® submersible pump has a closed impeller. The impeller is cast in one piece and hydraulically balanced to reduce thrust loads to a minimum. Residual loads are carried by the double ball bearings located in the motor support lantern. All impellers are dynamically balanced, according to DIN ISO 1940T1 balance grade 6.3 which grants a smooth vibration free operation. Finer balancing grades are available on request.

The impellers are placed on the pump shaft in overhung position and secured by key and cap nut with Heli-Coil insert.

NCTo-design
For handling liquids with solids or suspensions, the type NCTo with open impeller is also available. The NCTo-pumps are fitted with renewable wear disks to minimize maintenance costs.

Wear rings
The volute casings and the intermediate casings of the NCT-pumps are fitted with renewable wear rings as standard. The running clearances between casing wear rings and impeller comply with the recommendation of API 610.

Shaft
The shaft assembly consists of the drive shaft, one or more intermediate shafts and the pump shaft. These shafts are connected by rigid metallic plug-in couplings, secured by keys and locking fasteners.

Discharge pipe, column pipe
The discharge and column pipes consist of seamless pipe material with welded connection flanges.

Dome cover plate (mounting flange)
Standard material for the cover plate is carbon steel, 1.4571 (AISI 316L) S.S. is available as an option on request.

The cover plate with the drilled holes for pump installation on site is made according to customer's specification, or approved dimensional drawing.

If the pump is supposed to be installed in a pressurized vessel, the thickness of the cover plate will be calculated and sized according to the German Pressure Vessel Code. Material certificates 3.1 can be supplied on request.

Motor support lantern
The welded motor support lantern is made of fabricated steel. Ball bearings and shaft sealing are integrated in the support lantern. The lantern is machined in a way that alignment to the cover plate and alignment of drive shaft and motor shaft is guaranteed.