Single Casing, Radially Split Multistage Between Bearing Pumps

Pump Name: BB4 Feed Water Pump

Application: 

• High pressure boiler feed water applications
• High pressure mine drainage applications
• High pressure applications in water treatment plant.
• Pump as hydraulic power recovery turbine in water treatment plants.

Performance range:

Flow: Q=3~620m³/h
Head: H=55-2500m
Medium Temperature: T≤210ºC
Nozzle Orientation (suc/dis)Top-Top and Side-Side
Standard Motor Sync. Speed1000/1500/3000 rpm




Main parts :
1.Suction stage  2.Diffuser   3.Middle stage  4.Discharge stage  5. First stage impeller  6.Impeller  7.Balancing Disc
8. Balance plate  9.Cover  10. Packing 11. Balance sleeve 12.Packing gland 13. Oring 14.Bearing 
15.First stage sealing ring 16.Seal ring 17.Diffuser sleeve  18.Shaft  19.Shaft sleeve

Features:

• Design and manufacture as per company standard but can meet API610(BB4) requirements.
• Easy inspection and repair maintenance of bearings and mechanical seal after removal of coupling spacer only.
• Multistage pump with ring section diffuser casing design with centerline support to meet high temperature and high pressure applications especially in BFW applications.
• Pump with cartridge type mechanical seal at Driving end and Non driving end as per API682.
• First stage impeller with double suction is provided in KBDH models to improve NPSHR performance.
• Specially designed to meet high performance for superior and extended low cost operation.
• Pump family designed to have maximum parts interchangeability.

Casing:
The casing is multistage ring section, single casing, diffuser type centreline mounted on sturdy support pedestals.

The discharge casing is a structure prudently designed and fabricated of carefully selected material for high temperature and high pressure services. Particularly the balance chamber is of a unique construction achieved with year's long experience. The tests are secured at shaft centre for freedom from thermal effects.

Inter stage Casing is simplified in construction for freedom from thermal deformations, and is overall finished for minimum frictional loss in fluid. The interfaces at the respective stages are super finished for perfect seal without packing used.

Rodelta can also provide casings which are designed for maximum allowable working pressure and 2 times API nozzle loads and if required Rodelta can also provide casings which are designed for maximum allowable working pressure and 4 times API nozzle loads. If required Rodelta can also provide steam tracing/insulation to the casing, when high temperature application is involved. This is to avoid unwanted heat transfer or to avoid any accident/hazard due to high surface temperature of casing.

Nozzle orientation arrangement
Suction & discharge nozzles are designed in Top-Top configuration. Suction nozzles are available in 150/300 class flange rating as per ANSI B 16.5 whereas Discharge nozzles are available in 300/600/900/1500/2500 class flange rating (as applicable depending upon maximum working pressure). Flanges of suction & discharge nozzles are raised faced with a serrated finish. Nozzle loads are physically tested at our test bed centre by applying forces.

Auxiliary connections
Top-Top nozzle arrangements, a tapped and plugged vent is included in Rodelta's scope of supply. Drain holes are NPT and vent sizes are NPT. Seal circulation lines are ½" NPT, irrespective of discharge sizes. All provided connections are shipped with plugs made of materials compatible with the casings, unless otherwise specified. Additional connections can be provided for Quenching, Cooling water inlet & outlet & Warming line when specified.

Gasket
Liquid gasket is employed for sealing.

Stuffing box
Stuffing box is deep enough to accept various seal designs including tandem and double seals. Water cooled or Jacketing stuffing box designs are available at extra cost when specified or required. Cooling arrangement is provided for stuffing box depending upon the pumping temperatures.

Impeller
The impeller are of closed type, finished overall that a maximum hydraulic efficiency can be obtained. They are perfectly balanced, both dynamically and statically. The impellers are all located in one direction, with thrust balanced by drum. Impellers shall not be individually located along the shaft. Impellers are balanced individually as per ISO 1940 Gr 1/Gr 2.5.
If required Non - destructive like dye penetrant test on Machined surfaces or Radiography test can also be provided on impeller.

Impeller Wear Rings
The impeller wear rings are held on impeller with an interference fit and secured in positions with set screw to ensure positive fitment.

Lubrication
As a standard oil bath lubrication is provided to lubricate the bearing. In case of tilting pad bearings (hydrodynamic bearings) forced feed lubrication is provided. Lubrication system comply the latest API 614 chapter 2 & chapter 3 and also can fulfil customer specific requirements. Lube oil tanks are supplied separately mounted on base plate. Lube oil tanks can also supplied with in-built baseplate. Lubrication oil used is ISO VG46.

Delivery Packing :





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