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
VISCOSITY
- 0.2 - 4,250 cP
CONNECTION ORIENTATION
- Side Inlet | Top Outlet (GNX)
- Side Inlet | Side Outlet (GNXH)
TEMPERATURE
- -25°F to 240°F (-32°C to 115°C)
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)
AVAILABLE CERTIFICATES
- Hydrostatic Test
- Performance Test
- NPSH Test
- Material (actual or typical)
- Dimensional (pump only or unit)
PRIMARY MATERIALS OF CONSTRUCTION
- Ductile Iron, Cast Iron
VANE MATERIALS
- Duravane
- EC Laminate
- EC Cast Iron
MIN/MAX SPEED (rpm)
- 2" & 2.5": 323 - 814 rpm
- 3": 332 - 700 rpm
- 4": 257 - 563 rpm
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 |
| 4 | 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) Welded, ANSI Flange (Cl 150 RF) |
| 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) |
Maintenance Kits
| Model(s) | Description | Part Number |
|---|---|---|
| GNX2A, GNXH2A | Kit - Maintenance | 898908 |
| GNX2.5A, GNXH2.5A | Kit - Maintenance | 898909 |
| GNX3A, GNXH3A | Kit - Maintenance | 898958 |
| GNX4A, GNXH4A | Kit - Maintenance | 898959 |