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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.

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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.

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General Industrial

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GNX - GNXH Series 1 600 GNX_Front-Facing GNX2_Full-Assembly_composite-baseplate GNX2_Full-Assembly_metal-baseplate

GNX Series Sliding Vane Pumps Alignment-Free, Reduced-Speed Positive Displacement Pump for Non-Corrosive Liquids and Petroleum Products

Part of the Iron Line of sliding vane pumps, these Blackmer® pumps are the market’s only alignment-free, reduced-speed positive displacement pumps. They are suited for both portable and stationary applications. GNX Series pumps include the proven features of Blackmer legacy GX Series pumps but take them to the next level with the incorporation of a commercial-grade, single-stage gearbox. This innovative new gearbox fits between the motor and pump and is held in place by a permanent dowelled connection that creates a structural link between the high-speed and low-speed sides of the system. This results in a pump that will not need to be realigned either at initial installation or following a maintenance procedure, resulting in improved peace of mind for the operator. The pre-grouted GNX composite baseplate adds additional value to the pump, gearbox and motor setup by providing unmatched surface flatness, significant vibration damping, and reduced installation costs.

The GNX and GNXH Series pumps are designed to handle a wide range of non-corrosive, clean industrial liquids and petroleum products and are available in 2-, 2.5-, 3-, and 4-in sizes. The GNX Series pumps have a 90° porting orientation and the GNXH Series pumps have a 180° porting orientation.

Features and Benefits

  • Alignment-free, reduced-speed pumps
  • Robust commercial-grade gear reducer with expanded ratio options
  • Eliminates traditional couplings
  • Retained rotor between bearing design extends mechanical seal life
  • Compact footprint utilizing close coupled, inline design
  • Alignment free design reduces downtime and simplifies maintenance
  • Flexible porting – 90° and 180° options
  • Corrosion resistant composite baseplate with pre-grouted build, flatness of 0.002” per foot, and 24 times increased vibration damping of steel
  • 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

Applications

Non-corrosive, clean industrial liquids
  • Fuel oils
  • Lube oils
  • Jet fuels
  • Gasoline
  • Edible oils
Solvents & thinners
  • Esters
  • Ketones
  • Naphthas
  • Ethers
  • Amines
  • Aromatics
  • Alcohols
  • Terpenes
  • Glycols

Performance and Specifications

AVAILABLE MODELS
  • GNX2
  • GNX2.5
  • GNX3
  • GNX4
  • GNXH2
  • GNXH2.5
  • GNXH3
  • GNXH4
NOMINAL FLOW RATE RANGE
  • GNX2: 7 - 86 gpm (26 - 325 L/min) 
  • GNX2.5: 12 - 155 gpm (45 - 587 L/min)
  • GNX3: 100 - 275 gpm (379 - 1,041 L/min)
  • GNX4: 250 - 500 gpm (946 - 1,893 L/min)
DIFFERENTIAL PRESSURE
  • 2" & 2.5": 125 psi (8.6 bar)
  • 3" & 4": 100 psi (6.9 bar)
MAXIMUM WORKING PRESSURE (MAWP)
  • 175 psi (12.1 bar)
VISCOSITY
  • 0.2 - 4,250 cP
TEMPERATURE
  • -25°F to 240°F (-32°C to 115°C)
MIN/MAX SPEED (rpm)
  • 2" & 2.5": 323 - 814 rpm
  • 3": 332 - 700 rpm
  • 4": 257 - 563 rpm
PRIMARY MATERIALS OF CONSTRUCTION
  • Ductile Iron, Cast Iron
CONNECTION ORIENTATION
  • Side Inlet | Top Outlet (GNX)
  • Side Inlet | Side Outlet (GNXH)
VANE MATERIALS
  • Duravane
  • EC Laminate
  • EC Cast Iron
AVAILABLE CERTIFICATES
  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)

Dimensions

Pump Model L W H Approx. Wt.
GNX2 in 22-1/5 10-7/16 8-4/5 76 lb
mm 563.9 265.1 223.5 34 kg
GNX2.5 in 24 11-3/8 9-5/8 102 lb
mm 609.6 288.9 244.5 46 kg
GNX3 in 28 13-5/8 12-3/8 150 lb
mm 711.2 346.1 314.3 68 kg
GNX4 in 34-3/8 15-5/8 15-4/7 310 lb
mm 873.1 396.9 395.3 141 kg
GNXH2 in 22-1/5 10-7/16 8-7/8 74 lb
mm 563.6 265.1 225.4 34 kg
GNXH2.5 in 24 11-3/8 9-4/5 93 lb
mm 609.6 288.9 249.2 42 kg
GNXH3 in 28 13-1/2 12-3/8 146 lb
mm 711.2 342.9 314.3 66 kg
GNXH4 in 34-3/8 15-5/8 15-4/7 300 lb
mm 873.1 396.9 395.3 136 kg

Materials of Construction

Part Models Material
Cylinder
 
GNX 4, All GNXH
Ductile Iron: ASTM 536
 GNX 2, 2.5, 3  Cast Iron: ASTM 48
 Heads GNX(H) 4 outboard 
Ductile Iron: ASTM 536
 2, 2.5, 3, GNX(H)4 inboard Cast Iron: ASTM 48 
 Relief Valve Cover GNX 4, All GNXH  Ductile Iron: ASTM 536
GNX 2, 2.5, 3  Cast Iron: ASTM 48
Bearing Covers 2, 2.5, 3
Steel
 Cast Iron: ASTM 48
Locknut and Lockwasher GNX(H) 2, 2.5, 3 Only Steel
Rotor All GNX Models Ductile Iron: ASTM 536
Shaft 2, 2.5
High Strength Steel
 3, 4  High Strength Stainless Steel
Relief Valve (R/V) All GNX(H) Models Cast Iron: ASTM 48
Relief Valve Cap 2, 2.5
Steel
3, 4  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 GNX: Top Outlet: Outlet 90º offset from inlet 
GNXH: Side Outlet: Outlet 180° inline porting
CONNECTION OPTIONS NPT (threaded)
MOUNTING OPTIONS Pump Only
Unit: Pump, Motor, Baseplate, Couplings, Guards
SEALING OPTIONS Blackmer single mechanical seal

Vane Options

Material Temperature Limits Viscosity
Duravane -25°F to 240°F (-32°C to 115°C) 1 - 4,250 cP
EC Laminate -25°F to 240°F (-32°C to 115°C) 1 - 4,250 cP
Cast Iron -25°F to 240°F (-32°C to 115°C) 105 - 4,250 cP

Elastomer Options

Material Temperature Limits
FKM -15°F to 240°F (-26°C to 115°C)
PTFE - SS Spring 0°F to 240°F (-18°C to 115°C)
Buna-N -25°F to 240°F (-32°C to 115°C)

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