Marelli BB2 radially split, centerline mounted, double volute, between-bearings centrifugal process pump

Designed for processes engineers requiring reliable operation in heavy-duty elevated temperature process services

The Marelli model KSMK, API 610 BB2 and ISO 13709 radially split, centerline mounted, double volute, between-bearings centrifugal process pump. It is available in one or two stage configurations. These pumps feature a double suction impeller. In-line and side by side flange configurations are available.

  • Flows to 13,208 gpm (2,400 m³/hr)
  • Heads to 1,640 ft (350 m)
  • Suction Pressure 290 psi (20 bar)
  • Temperature Range -22 to 752°F (-30 to 400°C)

Precision engineered API/ISO 13709 process pumps meeting rigorous engineering requirements for heavy duty, high temperature applications while receding the total life cycle cost and improving mean time between repairs.


  • Toppings
  • Gas condensate
  • HDS
  • Platforming
  • Thermal solar
  • crude oil pipelines
  • Gas pipelines
  • Charge pumps
  • Low shear applications

Proven to be reliable, efficient and long-lasting, Marelli BB2 pumps provide a number of operational benefits for process engineers and plant operators:

  • API 610 11th Edition/ISO 13709 full compliance for reliability and accountability
  • Suitable with 60 Hz and 50 kW motors
  • Choice of multiple impellers in each hydraulic pump casing for maximum efficiency over a wide operating range
  • Centerline mounted pump casing maintains alignment during operation at elevated temperatures
  • Low suction specific speed and low NPSH characteristics, with a wide choice of impellers for optimum efficiency over a large operating range
  • Finned bearing housing to provide maximum heat dissipation under API 610 compliance
  • Deflection system with fins to improve cooling
  • Labyrinth bearing seals to avoid external contamination and maximize seal and lubrication life
  • Highly maintainable and replaceable wear rings to reduce overall life cycle costs
  • Mechanical seal chamber suitable for cartridges defined under API 682 3rd Edition
  • Socket welded flanged drains and vents as standard. Gussets and bracing also available
  • A variety of instrumentation options are available for monitoring all key operating parameters (temperature, pressure, vibrations and more)

US 60 Hz

  • Heads to                                                  1,640 ft
  • Flows to                                                  13,208 gpm
  • Standards                                               API 610 BB2
  • Maximum Motor Power                           2,000 HP
  • Temperature Range                                -22 to 752°F
  • Maximum Case Working Pressure          870 psi
  • Maximum Suction Pressure                     290 psi
  • Differential Head                                      1,640 ft
  • Maximum Viscosity                                  Consult Factory
  • Mounting Configuration       Horizontal/Top-Top (optional side-side)
  • Seal Configurations                                 API 682

Metric 50 Hz

  • Heads to                                                  350 m
  • Flows to                                                   2,400 m3/hr
  • Standards                                                ISO 13709
  • Maximum Motor Power                           1,500 kW
  • Temperature Range                                -30 to 400°C
  • Maximum Case Working Pressure         60 bar
  • Maximum Suction Pressure                     20 bar
  • Differential Head                                      500 m
  • Maximum Viscosity                                 Consult factory
  • Mounting Configuration   Horizontal/Top-Top (optional side-side)
  • Seal Configurations                                 API 682
Part S1 S5 S6 S8 C6 A8 D1
Pressure Casing Carbon Steel (A216 WCB) 12% CHR 316 AUS Duplex
Impeller Cast Iron Carbon Steel 12% CHR 316 AUS 12% CHR 316 AUS Duplex
Wear Rings Cast Iron 12% CHR Hardened Hard-faced 316 AUS 12% CHR Hardened Hard-faced 316 AUS Hard-faced Duplex
Shaft Carbon Steel AISI 4140 316 AUS 12% CHR 316 AUS Duplex
Bearing Housing Carbon Steel (A216 WCB)
Base Gasket AUS, Spiral Wound 316 AUS Spiral Wound AUS, Spiral Wound 316 AUS, Spiral Wound Duplex SS Spiral Wound

About Sundyne

Sundyne sets the standard for centrifugal integrally geared pumps. Over the years, Sundyne has also acquired some of the industry’s leading brands. This combination has expanded the Sundyne product line, offering a wide range of fluid handling services and solutions.