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Blackmer SGLWD3 Sliding Vane Pump Cutaway-1 Blackmer SGLW2 Sliding Vane Pump Cutaway Blackmer SGLWD3 Sliding Vane Pump Cutaway-2

SGL 2-4 Inch Sliding Vane Pumps Ductile-Iron Pump for Liquefied Gas Transfer Applications

Blackmer® SGL pumps, which are part of the Cavitation Line of sliding vane pumps, are designed for the liquid transfer or recirculation of refrigerants and other liquefied gasses. Constructed of shock-resistant ductile iron and available with a wide variety of seal materials, SGL pumps are ideally suited for almost any liquefied gas application.

The sliding vane, positive displacement design provides excellent priming capability and high performance over a wide range of temperatures and differential pressures. The vanes self-adjust as they wear, maintaining the efficiency of a new pump. The vanes, liner and end discs are all easily replaced, bringing the pump back to like new condition. In addition, SGL pumps feature a cavitation suppression liner designed for reducing the noise, vibration, and wear normally caused by entrained vapors.

SGL pumps are available in 2-, 3- and 4-inch sizes. Available options include a double mechanical seal.

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 SGL 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
  • Mechanical seal and elastomer options assure compatibility with refrigerants and other specialty gases
  • Available in 2-, 3- and 4-inch sizes
  • 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
  • Optional double mechanical seal
  • 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


  • Butadiene
  • Butene
  • Dimethyl ether
  • Ethyl chloride
  • Refrigerants - MF/TA/TMS/TF
  • Most 400 & 500 series blends
  • Sulfur dioxide

Performance and Specifications

  • SGLD2
  • SGLD3
  • SGLWD3
  • SGLD4
  • SGLWD4
  • SGLD2: 14 - 67 gpm (53 - 254 L/min)
  • SGL(W)D3: 30 - 133 gpm (114 - 503 L/min)
  • SGL(W)D4: 55 - 270 gpm (203 - 1,022 L/min)
  • SGLD2, SGL(W)D3: 150 psi (10.3 bar)
  • SGL(W)D4: 125 psi (8.62 bar)
  • Single Seal: 525 psi (36.2 bar)
  • Dual Seal: 350 psi (24.1 bar)
  • 0.2 - 4,250 cP
  • -30°F to 240°F (-34°C to 115°C)
  • 350 - 640
  • Ductile Iron
  • Side Inlet | Top Outlet
  • Duravane
  • EC Laminate
  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)


PUMP MODEL L W H Approx. Wt.
SGLD2 in 16-15/16 11 10 85 lb
mm 430.2 281 254 38.6 kg
SGLD3, SGLWD3 in 20-3/8 15-7/8 13-3/8 160 lb
mm 517.5 403.2 339.7 72.6 kg
SGLD4, SGLWD4 in 20-7/8 16-15/16 15-4/9 205 lb
mm 530.2 430.2 392.2 93 kg

Materials of Construction

Pressure Parts Materials 
Casing, Heads, Relief Valve Cover Ductile Iron: ASTM 536

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 mechanical seal - single or dual

Connection Options

Pump Size Standard Optional
SGLD2 Two 2" NPT Flanges
Ductile Iron: ASTM A536
Two 2" Weld Flanges
Steel: ASTM A216 WCB
SGL(W)D3 Two 3" NPT Flanges
Ductile Iron: ASTM A536
Two 3" Weld Flanges
Steel: ASTM A216 WCB
SGL(W)D4 4" x 3" Weld Flanges
Steel: ASTM A216 WCB
4" x 4" Weld Flanges
Steel: ASTM A216 WCB

Vane Options

Material Temperature Limits Viscosity
Duravane -25°F to 240°F (-32°C to 115°C) 0.2 - 4,250 cP
EC Laminate -30°F to 240°F (-34°C to 115°C) 0.2 - 4,250 cP

Elastomer Options

Material Temperature Limits
HNBR -30°F to 240°F (-34°C to 115°C)
FKM -15°F to 240°F (-26°C to 115°C)
PTFE - SS Spring 0°F to 240°F (-18°C to 115°C)
Neoprene -30°F to 240°F (-34°C to 115°C)

Maintenance Kits

Model(s) Description Part Number
SGLD2 Kit - Maintenance 898935
SGLD2 Kit - Rebuild 899035
SGLD3 Kit - Maintenance 898936
SGLD3 Kit - Rebuild 899036
SGLD4 Kit - Maintenance 898937
SGLD4 Kit - Rebuild 899037