Gear pumps with mechanical seal – TGGS series

Gear pumps with mechanical seal – TGGS series

SPEAK TO US TODAY +27 31 701 52 55

SPX Johnson TGGS to mechanically sealed internal gear pumps. Their main features are a combination of solid construction, flexibility in the selection of clearances, a unique shape of the interdental spaces, and a wide range of material designs and additional options, such as a heating jacket or overflow valves. They are characterized by a simple operating principle in which the liquid flows through the pump evenly with little pulsation. These pumps can also have a reversed flow direction.

TGGS gear pumps are used for pumping oils and lubricating fluidsincreased or low viscosity, and also high-temperature media. TGGS gear pumps are used for pumping oils and lubricating fluids with increased or low viscosity, as well as high-temperature media. TopGear series pumps are self-priming and are used in many industries, such as: food, chemical and construction industries.

SPX Johnson TGGS to mechanically sealed internal gear pumps. Their main features are a combination of solid construction, flexibility in the selection of clearances, a unique shape of the interdental spaces, and a wide range of material designs and additional options, such as a heating jacket or overflow valves. They are characterized by a simple operating principle in which the liquid flows through the pump evenly with little pulsation. These pumps can also have a reversed flow direction.

TGGS gear pumps are used for pumping oils and lubricating fluidsincreased or low viscosity, and also high-temperature media. TGGS gear pumps are used for pumping oils and lubricating fluids with increased or low viscosity, as well as high-temperature media. TopGear series pumps are self-priming and are used in many industries, such as: food, chemical and construction industries.

Technical specifications
Pump capacity: 80 m3/h
Max. rotational speed: 1450 rounds/min
Max. discharge pressure: 10 bars
Temperature: 200 °C
Viscosity: 5000 mPa·s
Max. particle size: 190 µm
Impeller type: gear, made of cast iron, nitrided ductile iron or stainless steel
Structural materials: Gray cast iron
Mechanical seal single type:
Burgmann MG12: Graphite/SiC/FPM or SiC/SiC/FPM
Burgmann M7N: SiC/Graphite/FPM, SiC/Graphite/PTFE jacket, SiC/SiC/FPM or SiC/SiC/PTFE-FFKM
Roplan RTI 239: SiC/Graphite/FPM Optionally: O-ring sets made of EPDM and FFKM (Chemraz®)
Typical applications
Industry Example of use
Petrochemical industry Pure asphalt or asphalt mixtures, diesel fuel, crude oil, lubricating oil, base oil, lubricants.
Chemical and dye industry Glycerin, polyols and polyurethanes.
Food industry Fats and vegetable and animal oils.
Product features

The TopGear (TG) series is a combination of solid construction with small clearances and a unique tooth profile on the drive gear. TG GS series pumps are mechanically sealed internal gear pumps. Their main features are a combination of solid construction, flexibility in the selection of clearances, a unique shape of the interdental spaces, and a wide range of material designs and additional options, such as a heating jacket or overflow valves.

Pumps in the TG GS series feature a simple operating principle in which the liquid flows through the pump evenly with minimal pulsations. These pumps can also have a reversed flow direction. Most models in the TG G series are designed to operate at the normal rotational speed of a 50 Hz electric motor – allowing for direct drive.

Pumps of this series are used for pumping oils and lubricating liquids with increased or low viscosity, as well as high-temperature media. TopGear series pumps are self-priming and are used in many industries, such as: food, chemical, and construction.

  • High performance – the design of pumps in this series features axial rotor locking, adjustable clearances and a balanced hydraulic design. The TG GS series is characterized by high permissible torque and one clearance class enabling very good overall efficiency.
  • 8 sizes – a range of models with maximum performance up to 80 m3/h and 10 bar pressure, allowing the pump to be tailored to the customer’s specific requirements.
  • Better Flooding – oversized ports for better performance, located above the pump centerline. This translates to a lower required NPSH (Net Positive Suction Head Required).
  • Designed for low or high viscosity media – unobstructed flow thanks to the optimized tooth profile on the drive gear.
  • No leaks due to thermal expansion – positive seal and pinion plug with cover.
  • Thoughtful construction – based on two ball bearings with adjustable axial clearance. Pumps in this series are able to withstand greater permissible axial forces.
  • Easy maintenance – possibility of dismantling and accessing the pump from both the front and the rear. Simple design and shorter service downtimes.
  • Wide range of material options – various bearing and hydraulic part designs available.
  • Extended service life – compact rotor, durable shafts, optimal bearing design, choice of hard metal bearings, vented sealing zone thanks to bleed channel.
  • Various connection options – compliant with EN or ANSI.
  • Explosion-proof design – compliant with ATEX directive, category II 2G.
Operation principle

Operating principle of SPX Johnson TopGear gear pumps
 

The rotor and pinion rotate and mesh with each other. This creates sealed chambers with variable volume, resulting in a vacuum that forces the medium to flow into these spaces. The liquid is transported in the chambers from the suction side to the discharge side. The spaces are separated from each other by an element that prevents the liquid from returning to the suction side. The medium is pumped to the discharge side as a result of the reduction in the volume of the interdental spaces.

Modular design
SPX Johnson TGG gear pump body. Pump housing with integrated feet and in-line ports

The pump housing can remain installed in the piping system during rotor and shaft seal inspection and repair.

SPX Johnson TGG Gear Pump Front Access Module. Front Access Module

The entire front (pinion, cover and pinion shaft) can be removed for easy internal inspection and repair.

SPX Johnson TGG Gear Pump Rear Access Module. Back pull-out design

Impeller with shaft, intermediate housing with rotor bearing, shaft seal and bearing bracket can be removed for easy inspection, repair and replacement of the shaft seal.

Top mounted relief valve for SPX Johnson TGG gear pumps. Top-mounted overflow valve

The pre-assembled and adjusted overpressure relief valve can be disassembled for inspection, repair, and if it is necessary to change the direction of rotation or pressure.

Construction

SPX Johnson TGGS gear pump construction.

1. Pump body

  • horizontal linear connections above the center line
  • available with several PN flange connections
  • ability to connect large diameter pipes
  • pressure gauge connections on both flanges
  • cork for filling, venting and draining
  • integrated feet on the pump body
  • unconstrained thermal expansion towards the rear
  • lower velocity in the pipeline and pressure losses
  • good NPSH characteristics
  • the liquid remains in the pump until the next start-up
  • easy servicing.
Front Access Module

Pinion cover in SPX Johnson TGG gear pumps. 2. Pinion cover with spigot

  • large recesses at the inlet and outlet
  • fixed pinion journal due to interference fit
  • several material options for plugs
  • Axial liquid inlet relative to the gears improves NPSHr characteristics.
  • the ability to select appropriate pinion gear materials for a given application.
SPX Johnson TGG Gear Pump Pinion. 3. Pinion with bushing

  • unique tooth profile
  • large pinion and sleeve journal diameter
  • ability to use low and high viscosity media
  • hydrodynamic lubrication capability through pumped liquid to reduce sleeve and pinion journal wear,
  • the ability to choose the right materials needed for a given application.
Rear access module

Impeller and shaft of SPX Johnson TGG gear pump. 4. Impeller and pump shaft

  • unique tooth profile and strong rotor teeth
  • durable rotor and shaft mounting via interference fit
  • several material options
  • ability to use high-viscosity liquids
  • high torque and radial force permissible even at high temperature and with standard clearances
  • Easy installation of shaft seals without the risk of damaging the elastomers.
  • possible V-belt drive
  • the ability to choose the right materials needed for a given application.
SPX Johnson TGG gear pump intermediate body. 5. Intermediate corpus

  • rotor radial bearing outside the pumped medium
  • easy maintenance and repair
  • single mechanical shaft seal
  • grease-lubricated radial cylindrical roller bearing
  • catching leaks between the mechanical seal and the roller bearing.
SPX Johnson TGG gear pump single mechanical seal.SPX Johnson TGG gear pump single mechanical seal. 6. Single mechanical seal

  • single short mechanical seal according to DIN24960
  • Large body diameter around the mechanical seal.
  • Improved design for viscous and particulate media, such as pigments.
  • Solid particles kept away from the sealing surfaces thanks to the conical shape of the cover.
  • Solid particles kept away from the sealing surfaces thanks to the conical shape of the cover.
  • possibility of cooling or heating via a jacket option in the intermediate piece
  • possibility of using different materials and workmanship
  • Easy maintenance and repair.
SPX Johnson TGG gear pump bearing bracket. 7. Ball bearing bracket with additional support

  • durable construction
  • long service life of ball bearings
  • easy maintenance and relubrication
  • drain port for draining liquid from the shaft seal
  • additional support enables axial thermal expansion and V-belt drive
  • possibility of readjusting axial play and compensating for axial wear.
Options, accessories
PEX Johnson TGG gear pump heating jacket. “S” type heating mantle mounted on the lid

  • designed for use with saturated steam or water vapor
  • heats the pump body, internal components, and relief valve body.
  • enables safe pump start-up and shut-down
  • allows the pump to be brought to the correct temperature when the liquid solidifies or is too viscous.
  • the possibility of adding a jacket cover later without having to replace the main pump parts.
Relief valve

  • protects the pump and installation against excessive overpressure by limiting the pressure difference between the suction and discharge sides
  • mounting on top of the pump, horizontal or vertical depending on the pump size,
  • Available in a double version: 2 single valves mounted opposite each other protect both flow directions through the pump.
  • optionally available with heating.
Operating principle of pressure relief valves

The operating principle of pressure relief valves in SPX Johnson TopGear gear pumps

Relief valves used in the TG GS series are spring-loaded valves that open abruptly when the operating pressure rises to the set pressure value, which the spring is preset to. These valves limit the differential pressure (∆p) (or operating pressure) between suction and discharge, not the maximum pressure in the system. If the liquid cannot escape when the discharge side of the pump is blocked, overpressure can cause serious damage to the pump. The relief valve provides an escape route by directing the media back to the suction side once a certain pressure level is reached. An open relief valve signals that the system is not working properly.

  • Technical specifications

  • Typical applications

  • Product features

  • Operation principle

  • Modular design

  • Construction

  • Options, accessories

  • Operating principle of pressure relief valves

Pump capacity: 80 m3/h
Max. rotational speed: 1450 rounds/min
Max. discharge pressure: 10 bars
Temperature: 200 °C
Viscosity: 5000 mPa·s
Max. particle size: 190 µm
Impeller type: gear, made of cast iron, nitrided ductile iron or stainless steel
Structural materials: Gray cast iron
Mechanical seal single type:
Burgmann MG12: Graphite/SiC/FPM or SiC/SiC/FPM
Burgmann M7N: SiC/Graphite/FPM, SiC/Graphite/PTFE jacket, SiC/SiC/FPM or SiC/SiC/PTFE-FFKM
Roplan RTI 239: SiC/Graphite/FPM Optionally: O-ring sets made of EPDM and FFKM (Chemraz®)

Performance curves