Magnetic seal gear pumps – TGMAG series

Magnetic seal gear pumps – TGMAG series

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SPX Johnson TG MAG gear pumps are seal-less gear pumps for low or high viscosity liquids that are corrosive, toxic, aggressive, or expensive. Total confinement of the liquid inside the pump is achieved through a hermetically sealed system that isolates the liquid from the surrounding environment. This design ensures clean and safe operation without leakage of the pumped medium. Magnetically driven pumps are therefore not only environmentally friendly, but also contribute to improved safety in chemical and processing plant environments, and are also compliant with the ATEX directive. This series has a wide selection of material designs and additional options, such as heating jackets, relief valves, or temperature sensors.

TopGear Mag gear pumps can operate in the chemical, petrochemical, and machine manufacturing industries.

SPX Johnson TG MAG gear pumps are seal-less gear pumps for low or high viscosity liquids that are corrosive, toxic, aggressive, or expensive. Total confinement of the liquid inside the pump is achieved through a hermetically sealed system that isolates the liquid from the surrounding environment. This design ensures clean and safe operation without leakage of the pumped medium. Magnetically driven pumps are therefore not only environmentally friendly, but also contribute to improved safety in chemical and processing plant environments, and are also compliant with the ATEX directive. This series has a wide selection of material designs and additional options, such as heating jackets, relief valves, or temperature sensors.

TopGear Mag gear pumps can operate in the chemical, petrochemical, and machine manufacturing industries.

Technical data
Pump capacity: 80 m3/h
Max. rotational speed: 1450 rpm
Max. discharge pressure: 16 bar
Temperature: 260 °C
Viscosity: 10,000 mPa·s
Max size of solids: 150 µm
Impeller type: gear, made of nitrided carbon steel or stainless steel
Pump materialss: grey cast iron or AISI316 stainless steel
Insulating jacket: Hastelloy C4
Magnets: SmCo (standard) good chemical and temperature resistance up to 260 °C
NdFeB (optional) for applications requiring higher torque – temp. limit to 120 °C
Elastomer materials: FPM, PTFE
other materials on request
Typical applications
Application example
Toxic and hazardous liquids Phenols, solvents, isocyanates, sodium hydroxides, epoxy resins, paints, adhesives, inks, fuel additives, corrosive solutions, sugar solutions, oils, bitumens, alcohols and other crystallizing or hardening liquids.
Product features

The TopGear (TG) series combines robust construction with small or large clearances and a unique tooth profile on the active gear. TG MAG series pumps are seal-less internal gear pumps designed for low or high viscosity liquids that are corrosive, toxic, aggressive, or expensive. This series also offers a wide selection of material designs and additional options, such as heating jackets, relief valves, or temperature sensors.

TopGear MAG pumps are equipped with a unique forced circulation and cooling system. This is a patented, integrated circulation system located in the intermediate cover. It guarantees cooling and lubrication of the magnetic coupling and sleeve regardless of operating pressure or liquid viscosity. Complete enclosure of the liquid inside the pump is achieved thanks to a hermetically sealed system that isolates the liquid from the surrounding environment. This eliminates the need for shaft seals and the associated wear and leakage that would normally occur. This design ensures clean and safe operation. Magnetically driven pumps are therefore not only environmentally friendly, but also contribute to improved safety in chemical and processing plant environments. TG Mag series pumps also comply with the ATEX directive.

  • Proven hydraulics – TG MAG pumps utilize proven TopGear series technology for high reliability.
  • Magnetically coupled pumps – the closed pumping system ensures clean, safe operation without leakage of hazardous, toxic, or expensive liquids.
  • Unique forced circulation and cooling system – the patented integrated circulation system in the intermediate cover guarantees cooling and lubrication of the magnetic coupling and sleeve regardless of operating pressure or liquid viscosity.
  • Large distance between the inner magnet and the containment shell – minimized friction when pumping highly viscous liquids ensures reduced heat generation and long-lasting operation. Sleeves made of special silicon carbide can handle low viscosity liquids and are extremely resistant to abrasion.
  • Containment shell between magnets made of Hastelloy C4 – the chemically resistant shell ensures reduced eddy current losses, increases efficiency, and minimizes temperature rise. Safe operation for a long time.
  • Bushing protection system – protects both the outer and inner magnets from operating with a damaged containment shell caused by bushing failure. No risk of leakage or contamination.
  • Monitoring options – possibility of installing temperature, pressure, and vibration sensors to minimize operating costs.
  • Heating jackets and safety valves – heating jackets ensure safety during pump start-up and shutdown. Pump heating can be done with steam or thermal oil.
  • Easy maintenance – possibility of disassembly and access to the pump from both the front and the rear.
  • High level of interchangeability with the TopGear GM series – easier servicing and fewer spare parts in stock.
  • Design for use in potentially explosive atmospheres – compliant with ATEX Directive, category II 2G.
Operation principle

Operating principle of SPX Johnson TopGear gear pumps
 

The rotor and pinion mesh together as they rotate. 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 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 decreasing volume of the inter-tooth spaces.

Modular design
SPX Johnson TG Mag gear pump housing Pump housing with integrated feet and line connections

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

Front access module of the SPX Johnson TG Mag gear pump Front access module

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

Rear access module of SPX Johnson TG Mag gear pumps Rear access module

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

Top-mounted relief valve in SPX Johnson TG Mag gear pumps Top-mounted relief valve

The pre-assembled and pre-set overpressure relief valve can be removed for inspection, repair and if the direction of rotation or pressure needs to be changed.

Construction

SPX Johnson TG Mag magnetically coupled gear pump design
 

1. Pump Casing

  • horizontal line connections above the center line,
  • several PN flanged connections available,
  • possibility of connecting large diameter pipes,
  • pressure gauge connections on both flanges,
  • plug for filling, venting and drainage,
  • integrated feet under the pump casing,
  • free thermal expansion towards the rear,
  • lower pipeline velocity and pressure losses,
  • good NPSH properties,
  • liquid remains in the pump until the next start,
  • facilitated maintenance.
Front Access Module

Cover with gear pin in SPX Johnson TGG gear pumps. 2. Cover with Gear Pin

  • large recesses at the inlet and outlet,
  • fixed gear pin thanks to press-fit,
  • several pin material options,
  • axial liquid inlet relative to the gears improves NPSHr properties,
  • possibility of selecting appropriate gear pin materials for a given application.
Heating jacket of SPX Johnson TGG gear pumps. “S” or “T” type heating jacket mounted on the cover (optional)

Additional front cover with heating jacket with several types of connections:

  • steam-powered version with threaded connections (“S” type),
  • thermal oil powered version with flanged connections (“T” type),
  • heats the pump casing, internal elements and the relief valve body.
Gear of SPX Johnson TGG gear pumps. 3. Gear with Sleeve

  • unique tooth profile,
  • large gear pin and sleeve diameter,
  • possibility of using low and high viscosity media,
  • possibility of hydrodynamic lubrication by the pumped liquid to reduce wear of the sleeve and gear pin,
  • possibility of selecting appropriate materials needed for a given application.
Rear Access Module

Rear access module of SPX Johnson TG Mag gear pumps

Impeller and shaft of the SPX Johnson TopGear Mag gear pump. 4. Impeller and Pump Shaft

  • rotor shaft machined in one piece,
  • construction materials: carbon steel or stainless steel,
  • unique tooth profile,
  • high safety margin in case of mechanical failure,
  • reduced bearing forces and low noise level,
  • possibility of choosing corrosion-resistant material.
Bearing of the SPX Johnson TG Mag gear pump. 5. Bearing

  • compact, pre-assembled bearing set,
  • bearings lubricated by the pumped medium,
  • cooling and lubrication system integrated in the bearing system,
  • no adjustment shims or axial bearing clearance adjustment required,
  • the use of a wear-resistant shaft sleeve protects the shaft,
  • bearing load reduced thanks to the compact design and hydraulic balancing.
Bearing bracket of SPX Johnson TopGear Mag gear pumps. 6. Bearing Bracket

  • possibility of exchanging elements with TG GM series pumps with double mechanical seal,
  • additional support under the bearing bracket relieves the pump feet and enables the pump to be driven by a belt drive,
  • maintenance-free,
  • anti-spark safety bearing prevents the outer magnetic rotor from hitting the bracket in case of ball bearing failure,
  • possibility of installing a PT100 temperature sensor,
  • additional protection of bearings against water and contamination thanks to the labyrinth seal design.
Magnetic coupling of SPX Johnson TopGear Mag gear pumps. 7. Magnetic Coupling

  • small dimensions and minimized hydraulic friction losses inside the coupling,
  • good thermal stability of SmCo magnets allows for safe operation at temperatures up to 250 °C,
  • magnets protected against corrosion from the pumped medium,
  • large gaps minimize hydraulic friction losses and make the magnetic coupling suitable for high viscosity media,
  • easy assembly and disassembly.
Intermediate cover of SPX Johnson TopGear Mag gear pumps. 8. Intermediate Cover

  • compact design combined with a bearing set,
  • integrated circulation pump,
  • available in carbon steel or stainless steel versions,
  • various heating options.
Options, accessories
Heating jacket for SPX Johnson TopGear Mag. gear pumps “S” Type Heating Jacket Mounted on the Cover

Steam-powered version with threaded connections.

  • heats the pump body, internal elements, and relief valve body,
  • allows for safe pump start-up and shutdown,
  • allows the pump to reach the correct temperature when the liquid solidifies or has excessive viscosity,
  • possibility of later adding the jacket cover without the need to replace the main pump parts.
Heating jacket for SPX Johnson TopGear Mag. gear pumps “T” Type Heating Jacket Mounted on the Cover

Thermal oil-powered version with flanged connections.

  • heats the pump body, internal elements, and relief valve body,
  • allows for safe pump start-up and shutdown,
  • allows the pump to reach the correct temperature when the liquid solidifies or has excessive viscosity,
  • possibility of later adding the jacket cover without the need to replace the main pump parts.
Gear shaft cover for SPX Johnson TopGear Mag. gear pumps Gear Shaft Cover (available only with the “T” type heating jacket option)

  • ensures tightness between the pump interior and the heating jacket at extreme temperature and pressure,
  • very tight gear shaft seal,
  • high-temperature design – strong bolts and thick cover wall.
Top-mounted relief valve in SPX Johnson TopGear Mag. gear pumps Relief Valve

  • protects the pump and installation against excessive overpressure by limiting the pressure difference between the suction and discharge sides,
  • mounted on top of the pump, horizontally or vertically 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.
PT100 temperature sensor in SPX Johnson TopGear Mag. gear pumps PT100 Temperature Sensor

  • used to measure the temperature of the pumped liquid,
  • the obtained measurement can be used to set a process interruption when a pre-set temperature limit is reached.
Operation principle of relief valves

Operating principle of relief valves in SPX Johnson TopGear gear pumps

The relief valves used in the TG Mag series are spring-loaded valves that open rapidly when the operating pressure rises to the set pressure value, which is pre-set by the spring. These valves limit the pressure difference (∆p) (or working pressure) between the 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, directing the media back to the suction side after a certain pressure level is reached. An open relief valve signals that the system is not working properly.

  • Technical data

  • Typical applications

  • Product features

  • Operation principle

  • Modular design

  • Construction

  • Options, accessories

  • Operation principle of relief valves

Pump capacity: 80 m3/h
Max. rotational speed: 1450 rpm
Max. discharge pressure: 16 bar
Temperature: 260 °C
Viscosity: 10,000 mPa·s
Max size of solids: 150 µm
Impeller type: gear, made of nitrided carbon steel or stainless steel
Pump materialss: grey cast iron or AISI316 stainless steel
Insulating jacket: Hastelloy C4
Magnets: SmCo (standard) good chemical and temperature resistance up to 260 °C
NdFeB (optional) for applications requiring higher torque – temp. limit to 120 °C
Elastomer materials: FPM, PTFE
other materials on request

Performance curves