DESCRIPTION

CNSDp pumps are horizontal, double-casing, radially split, multistage, between-bearings pumps of a BB5 type (barrel pumps), in full compliance with ANSI/API standard 610 (ISO 13709:2009).

APPLICATION

• Water injection into reservoirs to maintain formation pressure
• High-pressure oil refining processes
• Various applications in petrochemical and gas processing industry
• Gas condensate treatment units

TECHNICAL DATA

• Capacity: up to 1840 m³/h
• Head: up to 2800 m
• Pressure: up to 300 bar
• Max temperature: + 400 °C

MATERIALS

Duplex steel (D-1 class according to API 610 11-th Ed.)	Super Duplex steel (D-2 class according to API 610 11-th Ed.)
Pressure casing: duplex steel GX2CrNiMoCuN-25-6-3-3 Inner case parts: duplex steel GX2CrNiMoCuN-25-6-3-3     Shaft: duplex steel X2CrNiMoN-22-5-3 Wear rings parts: hard-faced duplex steel	Pressure casing: super duplex steel GX2CrNiMoN-26-7-4 Inner case parts: super duplex steel GX2CrNiMoN-26-7-4 Shaft: super duplex steel X2CrNiMoCuWN-25-7-4 Wear rings parts: hard-faced super duplex steel

DESIGN FEATURES

• The pump rotor is hydraulically unloaded by the oppositely arranged impellers fixed on the shaft by their press fit, embedded rings and shaft keys.
• The outer casing is engineered and rated for the maximum allowable working pressure (MAWP).
• Suction and discharge nozzles are directed vertically upwards. The pump supports are located on a centerline. The inner casing of a cartridge type consists of the radially split sections with metal-to-metal sealing and additional rubber rings completely eliminating internal circulation of the liquid. Due to a cartridge design the inner casing can be replaced on the site of operation without dismantling the outer casing.
• The pump rotor is supported by the segmented bearings with forced lubrication system.
• The residual axial force arising as a result of uneven wear of impellers' seals during operation is accepted by the Mitchell type thrust bearing with self-aligning pads and leveling system.
• An oil pump of the lubrication system can be optionally installed on the main pump shaft.
• The rotor sealing can be either single or double mechanical type in accordance with API 682. Pressure in the sealing system is maintained by a hydraulic accumulator. The impeller of a mechanical sealing provides circulation of the barrier fluid that is cooled in a heat exchanger. The pump is connected with a drive through the elastic diaphragm coupling.

PUMPED MEDIA

Highly-corrosive seawater, stratal water and waste water (including the fluids containing hydrogen sulfide):

• Density, kg /m³: up to 1180
• Max size of solid particles, mm: 0.2
• рH value: 4 ... 9
• Oil content, mg/L: up to 200
• H2S content, mg/L: up to 400

OPERATIONAL INTERVALS AND LIFETIME

Depending on the pumped media the average operational lifetime amounts to:

• Mean time between overhauls (MTBO): over 40000 hours
• Casing parts service life: over 30 years

PERFORMANCE RANGE

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