CTM Magnetically Driven Centrifugal Pump

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What is a CTM Magnetically Driven Centrifugal Pump

Varying from the standard pumping mechanism, CTM Magnetically Driven Centrifugal Pump or 'Mag'drive pumps are designed so that the motor is coupled to the pump by magnets, instead of a direct mechanical shaft. The drive magnet works the pump, 'driving' the pump rotor, which is magnetically coupled to the primary shaft driven by the motor. Magnetic Pumps are used in industries where leakage of the agent being pumped could cause damage, such as in the chemical or nuclear industries.

How do Tapflo CTM Centrifugal Pumps work?

The CTM Centrifugal Pumps are Magnetical Driven End Suction, Close Coupled, Single Stage Centrifugal Pumps feature a Semi-Open or Closed Impeller and are manufactured from either Glass Fibre Reinforced Polypropylene or PVDF to offer high mechanical and corrosion resistance for a plethora of applications at competitive pricing.

Materials Data & Limits

Casing & Isolation Shell PP-GF (30%) or PVDF
Impeller PP or PVDF
Lantern (Not Wetted) PP-GF (30%)
Static Bushings Ceramic (Std.) or SiC
Rotating Bushings PTFE-Graphite (Std.) or SiC
O-Rings FKM, EPDM, FFKM, FEP / Silicon
Magnets NdFeB
Motor IEC standard, 3x400 VAC (other on request), 2900 rpm, IP55, B34 frame
Pressure Ratings CTM20:   PP pumps: PN4 at 20°C, PN2 at 70°C PVDF pumps: PN4 at 20°C, PN2 at 80°C   CTM25, CTM32, CTM40 and CTM50:   PP pumps: PN6 at 20°C; PN2 at 70°C PVDF pumps: PN6 at 20°C; PN2 at 90°C
Temperature Ranges PP Pumps: 0-70ºC PVDF Pumps: 0-80ºC (CTM 20) / 0-90ºC (CTM25 – 50)
Kinematic Viscosity 200 cSt (max)
Dynamic Viscosity 10 cP (max)

Capacity Range

The CTM Mag Drive Centrifugal Pumps are capable of a wide range flow and pressures to suit most applications. The capacity overview is below.

CTM-Capacity-Range

Dimensions

Dimensions are in mm and based on standard build constructions. DWG & STEP Files are available upon request for integration into system build designs. 

CTM-Dimensions

Model CTM 20-7 CTM 25-8 CTM 25-10 CTM 32-12.5 CTM 40-12.5 CTM 50-12.5
A 70 90 100 105 105 110
B 48 58.5 63 56 56.5 54
C 93.5 100.5 136.5 164 165 189
ØE 15 18 18 15 23 30.8
øF 15 18 18 23 30.5 42
G ¾” 1” 1” 1¼” 1½” 2”
H ¾” 1” 1” 1” 1¼” 1½”
L 248.5 279 334.5 374.5 402.5 446 453
M 36 40 45 54.5 56 63 70
N* 71 80 80 100 125 140
P* 9 10 10 13 14 15
Q 56 63 71 80 90 100 112
R 35 39.5 43.5 58.5 58.5 52
S* 90 100 112 125 140 160 190
T 112 126 141 160 170 200 230
U* 5.5 7 7 10 10 12
Motor
Power, kW 0.12 0.25 0.55 0.75 0.75 1.1 1.5 2.2 3.0 4.0
Frame Size 56 63 71 80 90 100 112
Weight, Kg (PP) 4.3 5.7 8.75 9 11.7 15.7 24 25.5 31.55 -
Weight, Kg (PVDF) 4.45 5.9 9.2 9.4 12.2 16.2 24.65 26.2 32.15 -
Optional Connections
Flanged - DN25 DN25 DN32 / DN25 DN40 / DN32 DN50 / DN40
Hose Tails - Ø25 Ø25 Ø32 / 25 Ø40 / 32 Ø50 / 40

Operating Principle of CTM Centrifugal Pumps

In order to start the pump, the casing has to be filled with liquid before start-up and have a positive suction head to operate efficiently. The NPSHr (Net Positive Suction Head Required) can be provided during the selection and assessment of the pump for your intended application.

Upon start-up, the liquid enters the pump casing axially onto the eye of the impeller. The rotating impeller generates a centrifugal force accelerating the liquid through the pump casing and into the discharge piping. As the fluid is accelerated by the impeller and thrown towards the discharge outlet a low pressure point is generated at the eye of the impeller effectively drawing fluid from the suction side to the pump and continuing the pumping cycle.

Unlike standard close coupled centrifugal pumps where the impeller is connected to the motor shaft directly, in a CTM Magnetically Driven Centrifugal Pump, the torque from the motor shaft is transmitted to the impeller by means of a magnetic coupling. The drive magnet is fixed on the motor shaft. The magnets installed in the drive magnet and in the impeller/magnet assemblies have different polarities.

When the pump is at rest, the magnets of both parts are aligned. When the motor is started and the drive magnet starts to rotate, the magnets create an attraction and repulsion force thus forcing the impeller to rotate. If the impeller gets blocked or the pumped liquid will be too dense and too much torque will be generated on the motor shaft, the magnet will de-couple and no damaged will be done to the motor. When the pump will come to a stop, the magnets will re-couple. Between both magnet assemblies there is an isolation shell that separates the liquid side from the motor side and from entering the atmosphere.

CTM 20-7

CTM-20-7

CTM 25-8

CTM-25-8

CTM 25-10

CTM-25-10

CTM 32-12.5
CTM-32-12.5
CTM 40-12.5

CTM-40-12.5

CTM 50-12.5

CTM-50-12.5

ctm

Design Features & Benefits

The CTM Mag Drive Centrifugal Pump is a close coupled compact pump ideal for service in little spaces like in OEM installations. The wetted components are non-metallic injection moulded thermoplastics enabling excellent corrosion resistance.

Part No. Description
1 Pump Casing
2 Impeller (With Magnet)
3 External Magnet (Drive)
4 Isolating Shell (Rear Casing)
5 Static Bushing
6 Rotating Bushing

CTM-Magnetically-Driven-Centrifugal-Pump-benefits

Magnet Cage System

ctm diagram

The magnets are totally encapsulated in their cage with the unique system that avoids the use of resins and glue. This grants a safe system with better performance at high temperatures. Furthermore, the impeller is injection moulded, resulting in excellent performance and no weak points.

Typical Applications

The CTM Centrifugal Pumps range is perfectly suited for a wide variety of applications for clean & thin liquids like pure chemicals, acids & alkalis.

Industry Example of application
Chemical stockists  Transfer of various chemicals from storage tanks to smaller containers
Surface treatment  Transfer, filtering and circulation of surface treatment baths
Food and beverage  Pumping of CIP detergent used for cleaning of pipes and other food     process equipment
Water treatment  Dosing of acids and alkalis used as cleaning chemicals in Nano filtration
Chemical manufacture  Pumping of chemicals in industrial detergent equipment
Demineralizing  Demi-water circulation and transfer in many industrial applications
Photo processing  Transfer of photo develop chemicals and inclusion in processing machines
Liquid crystal manufacture  Pumping of concentrated acids and alkalis

Typically, CTM Magnetically Driven Centrifugal pumps are used for tank to tank transfer applications however, they can also be used for pressure boosting, dispensing, loading and offloading, tank cleaning, batching & metering, when used in conjunction with some of our wide range of control accessories.

Connection Options

BSPT M (Standard) Flanged to DIN2633 (PN 10/16) Hose Tails  

Motor Options

The CTM units are fitted with Safe Area IP55 Motors in Aluminium Casings as standard and are in line with all current Energy Efficiency Class legislation. Motor Powers vary from 0.12 kW up to 4 kW in standard IEC frame sizes in both 50 & 60 Hz and Single or 3 Phase. S1 Duty Class is standard. 2 & 4 Pole are supplied as standard options however 6 Pole (1000 rpm) & 8 Pole (800 rpm) as well as 2 Speed can be provided upon request as well.  Cast Iron Casings can be supplied upon request to provide a more robust casing material for external applications or particularly arduous environments. Special Voltages are also available upon request, 110V & 500V for example.  PTC Thermistors can also be supplied upon request when motors are to be controlled by variable frequency drives and to monitor motor temperature rises.

Permitted Loads on Inlet & Outlet Connections

We recommend not exceeding the following loads & forces to ensure safe operation of the pump.

CTM-Permitted-loads

CTM 20 CTM 25
Direction Load (N) Moment of Force (Nm) Direction Load (N) Moment of Force (Nm)
X 15 3 X 15 3
Y 20 4 Y 20 4
Z 15 3 Z 15 3
CTM 32 CTM 40
Direction Load (N) Moment of Force (Nm) Direction Load (N) Moment of Force (Nm)
X 15 3 X 15 3
Y 20 4 Y 20 4
Z 15 3 Z 15 3
CTM 50
Direction Load (N) Moment of Force (Nm)
X 15 3
Y 20 4
Z 15 3
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