Blackmer Technology

Your Pump Questions Answered

Get in-depth information about Blackmer pump and compressor technologies while learning why our solutions are the ideal choice to help solve your most critical fluid-handling applications.

View Our Technologies

Blackmer Products

Better Get Blackmer®

Blackmer® is the leading global provider of innovative, high-quality sliding vane, centrifugal, screw and regenerative turbine pump, and reciprocating gas compressor technologies for the safe transfer of liquids and gases.

View Our Products

Sliding Vane Pumps

View All

Blackmer Markets

Providing Innovative Product-Transfer Solutions for a Variety of Markets and Applications

Blackmer provides innovative product transfer solutions for many markets and applications, including in the chemical process, energy, transport, military & marine; general industrial, and oil & gas industries.

View Our Markets
Blackmer CRL2 Sliding Vane Pump CO2

CRL 2-4 Inch Sliding Vane Pumps Ductile-Iron Pump for Bulk Transfer of Liquefied CO2 Transfer Applications

CRL 2- to 4-in pumps, which are part of the Cavitation Line of sliding vane pumps, are widely used for rugged bulk-transfer and recirculation applications which include industrial and food-processing systems, refrigeration, process plants and transport loading and unloading.

The 2-, 3-, 4-in port size models have capacities ranging from 25 to 300 U.S. gpm (95-1134 L/min). All models have a double-ended drive shaft arrangement, which allows the pump to be easily positioned for clockwise or counterclockwise shaft rotation. These pumps are equipped with an internal relief valve, and a replaceable casing liner and end discs for easy rebuilding of the pumping chamber if ever necessary. In addition, these pumps feature cavitation suppression liners to reduce noise, vibration and wear.

Standard construction materials for these models include silicon carbide mechanical seals and laminate vanes. Ports are offered with NPT tapped companion flanges or weld flanges (see companion flange chart below). Maximum differential pressure is 100 psi (6.89 bar) for all models.

Standard base-mounted unit assemblies are available from the factory with helical gear reduction or V-belt drives. All assembled units are available with or without motors. For dimensions of assembled pump units, refer to catalog dimension sheets. Alternate drive arrangements include P.T.O., hydraulic motor or engine drivers.

Blackmer fully Integrated Unit Assemblies are the pre-engineered and pre-designed drop-in pumping solution. These unit assemblies, include motor, gearbox, baseplate, coupling safety covers, and a CRL Sliding Vane Pump (2, 3 & 4-inch size). No alignment required with these pre-configured fully Integrated Unit Assemblies as they are ready for immediate drop-in installation.

Features and Benefits

  • Cavitation suppression liner design for reducing the noise, vibration, and wear normally caused by entrained vapors
  • Replaceable casing, liners and end discs allow easy rebuilding of the pumping chamber to like-new condition
  • Ductile-iron construction with internal relief valve
  • Blackmer mechanical seal and ball bearing construction provide maximum reliability
  • Symmetrical bearing support assures even loading and wear for long life
  • Adjustable relief valve protects pump against excessive pressures
  • External ball bearings are isolated from pumpage by mechanical seals to maximize bearing life and minimize contamination risk
  • Advantages of sliding vane technology:
    • Unique sliding-vane pump design self-adjusts for wear to maintain flow rates
    • Excellent self-priming and dry-run capabilities
    • Sliding vane design provides sustained performance and trouble-free operation
    • Easy maintenance: vanes can be easily replaced without removing the pump from the piping system
    • High suction lift and line-stripping capabilities
    • Low maintenance and low life-cycle costs


  • CO2
    • Recirculation
    • Processing
    • Bulk transfer
    • Truck & transport
    • Railcar unloading
    • Vapor recovery

Performance and Specifications



  • CRL2: 18 - 72 gpm (68 - 273 L/min)
  • CRL3: 20 - 150 gpm (76 - 568 L/min)
  • CRL4: 75 - 320 gpm (284 - 1,211 L/min)
Differential Pressure

100 psi (6.9 bar)

  • CRL2-4: 525 psi (36.2 bar)

0.2 - 4,250 cP


-30°F to 240°F (-34°C to 115°C)

  • CRL2-4: 330 - 640

Ductile Iron


CRL2-4: Side Inlet | Top Outlet



  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)


Pump Model L W H Approx. Wt.
CRL2 in 16-15/16 9-2/3 10 85 lb
mm 430.2 246.1 254 38.6 kg
CRL3 in 20-3/8 13-1/4 13-3/8 160 lb
mm 517.5 336.6 339.7 72.6 kg
CRL4 in 20-2/3 16-15/16 15-4/9 205 lb
mm 525.5 430.2 392.2 93 kg

Materials of Construction

 Part  Material
Cylinder, Head, Relief Valve Cover Ductile Iron: ASTM 536
Liner, Discs Cast Iron: ASTM A48

Pump Options

Options Details
Orientation Options Right Hand: INLET is to the right, when looking from driven side
Left Hand: INLET is to the left, when looking from driven side
Porting Options Top Outlet: Outlet 90° offset from inlet
Mounting Options Pump Only
Unit: Pump, Motor, Baseplate, Couplings, Guards
Sealing Options Blackmer single mechanical seal

Connection Options

Pump Size Standard Optional
CRL2 Two 2" NPT Flanges
Ductile Iron: ASTM A536
Two 2" Weld Flanges
Ductile Iron: ASTM A216 WCB
CRL3 Two 3" NPT Flanges
Ductile Iron: ASTM A536
Two 3" Weld Flanges
Ductile Iron: ASTM A216 WCB
CRL4B One 4" Weld Flange (inlet)
Steel: ASTM A216 WCB
One 3" Weld Flange (discharge)
Steel: ASTM A216 WCB
Two 3" NPT Flanges
Ductile Iron: ASTM A536
Two 3" Weld
Steel: ASTM A216 WCB
Two 4" Weld Flanges
Steel: ASTM A216 WCB

Vane Options

Material Temperature Limits Viscosity
STD Laminate -30°F to 240°F (-34°C to 115°C) 0.2 - 4,250 cP

Elastomers Options

Material Temperature Limits
Buna-N -30°F to 240°F (-34°C to 115°C)

Maintenance Kits

Model(s) Description Part Number
CRL2 Kit - Maintenance 898905
CRL2 Kit - Rebuild 899005
CRL3 Kit - Maintenance 898906
CRL3 Kit - Rebuild 899006
CRL3-OE1 Kit - Rebuild 899119
CRL3-OE1 Kit - Maintenance 899219
CRL4B Kit - Maintenance 898907
CRL4B Kit - Rebuild 899007
CRL4B-OE1 Kit - Maintenance 899131