Rodelta KBSD (BB2) acc API 610

Features: BB2

• Conforming to latest API 610. (BB2)
• Between bearing pump, single stage
• Double suction impeller pump
• Casing is center line mounted and with case wear ring
• Removal of rotor or inner elements is possible without disconnecting suction or discharge piping or moving the driver.
• Enclosed impellers with wear rings.
• Inherent axial thrust balancing because of double suction impeller.
• Impeller is keyed to the shaft
• Impellers located using impeller nut with threads to tighten by liquid drag on the impeller during normal rotation.
• Shaft supported on antifriction bearings
• DE – A roller bearing with C3 clearance
• NDE – A pair of angular contact ball bearing in back to back arrangement
• Thrust bearing is located on the shaft with the help of lock washer and lock nut.
• Oil level monitoring of the pump by constant level oiler.
• Bearing housing is with bearing covers having replaceable labyrinth type end seals.
• Pump with cartridge type mechanical seals at DE and NDE as per API682.
• Pump is available with taper shaft which makes easier removal of the coupling.

Optional Features:

• Pump with Sleeve – Ball bearings
• Jacketed casing for steam circulation
• Pump with purge mist on pure mist lubrication
• Steam traced casing for heating of casing.

Special Features:

• Casing with Side -Top Nozzle
• Pump with sleeve-hydrodynamic thrust bearing arrangement (Pressurized oil lubrication)

Pump Casing
The casing is radially  split  and  centerline  mounted  on  pedestals.  This reduces the  effect  of  non-uniform  thermal  expansion  of  casing  caused  when  pump  is  subjected  to  high  temperature  working  liquid  and/or external  nozzle  loads.

All casings are double volute  type  to  take  care  of  radial  load  generated  during  operational of the pump. The double volute design minimizes shaft deflection and eliminates unpredictable bearing and seal failures. Casing with thermal insulation can be provided to avoid unwanted heat transfer from liquid to surroundings & also to safe guard operator from getting injured because of direct contact with casing with high temperature.  Provisions for mounting temperature / pressure gauge can be made on casing.

Nozzle orientation arrangement & pressure ratings
Possible suction & discharge nozzle arrangements available are Top‐Top, Side‐Top or Side‐Side. Depending on customer’s requirement pump with any of the above configurations can be designed & manufactured. Depending upon MAWP of pump, nozzle rating according to ASME B16.5 ranging from Class #150 to #600 with Raised Face (RF) & with Ring Type Joint (RTJ) above Cl.#900 are available.

Auxiliary Connections
Pumps with Top‐Top & Side‐Top nozzle orientations are with self‐Venting arrangement whereas drain connection of ¾ inch  is  taken  out  from  the  bottom  of  casing  &  flange  connection  is  provided  within battery limit. Drain connection with Flanged + Valve arrangement can be provided if specified.

Casing Gasket
An 18-8 stainless steel spiral wound gasket with non-Asbestos filter is provided  between  the  casing cover and the pump casing.

Stuffing box
The stuffing box is deep enough to accept various seal designs including tandem and double seals. Pump with conversion kit can also be supplied at site. After reaching pump to site this conversion kit can be removed & job specific seal can be assembled. Water cooled or steam heated stuffing box designs are available at extra cost when specified or required. Hydro‐test pressure for standard water jacket is 9.8 bar (G).

Impeller
The impeller is a closed & is double suction type. It is provided with both front and back wear rings fixed with grub screw to ensure positive fitment of wear rings on impeller hub. Being a double suction design it helps in balancing of axial thrust developed during operation of pump. It also helps in reducing the suction specific speed of the pump which sometimes becomes hurdle in technical acceptance of model. Optional  Inducer  design  is  also  available  for  critical  NPSH  requirement  or  under  critical  suction conditions. These impellers are located on shaft using impeller nut with threads to tighten by liquid drag on the impeller during normal operation of pump.

Impeller wear-rings
The impeller wear rings are made in same MOC as that of impeller & held on with an interference fit and secured in positions with grub screws radially to ensure positive fitment on impeller hub. In case process liquid contains solid particles, then serrations or wear ring flushing can be provided to avoid choking of these solid particles in wear rings.

Case Wear-rings
The  case  wear  rings  are  inserted  in  the  casing  and  the  casing  cover  with  an interference fit and secured in position with grub screws radially to ensure positive fitment.

Pump Shaft and bearings
Generally shafts are made up of bar materials, in some cases where there is not possible to make shaft from  bar  material,  shafts  can  be  made  by  forging  process.

These  shafts  are  supported  on  antifriction  bearing on both DE & NDE side of pump. On DE side a roller bearing with C3 clearance & on NDE side a pair of angular contact ball bearing in back to back arrangement in provided to take care of radial thrust developed during normal operation of pump. On DE side tapered shaft end is provided for easy removal of coupling hub & space during maintenance period. Thrust bearings are located on shaft with help of lock washer & loch nut.

Bearing Housing
Normally the bearing housings is designed to accommodate antifriction bearings which are lubricated through an integral splash type system accompanied with an oil Ring. This oil ring is freely suspended over  shaft  &  because  of  relative  motion  between  shaft  &  oil  ring it rotates freely

splashing  oil form  bearing  housing  on  bearing  to  lubricate  them.  Dual,  single  row,  back  to  back,  angular  contact  thrust bearings  and  single  row  radial bearings are  provided as

standard.  For  high  power  pumps,  bearing  housing can  be designed to accommodate sleeve ball arrangement. The bearing housing  has an extra large oil reservoir to provide sufficient cooling capacity. It is provided with arrangement for fitment of a constant level oiler which includes a mechanically lockable adjustment and a protecting wire cage.

The following optional features are available at extra cost.

1. Oil mist lubrication
2. Water cooled bearing housing
3. Fan cooled bearing housing

Also  flat  face  on  top  of  bearing  housing  is  provided  to  facilitate  the  mounting  of  bearing
RTD’s  for  temperature monitoring of bearings.

Applications:

• Fluid handling in oil refineries and petrochemical industry.
• High temperature and high pressure critical applications in chemical and allied industry
• Pumps as Hydraulic Power Recovery Turbine (HPRT) in chemical and process plants.

Variety of materials of constructions and seal flushing plans are available to cater to a wide range of applications.