FELUWA MULTISAFE® double hose-diaphragm pumps
for abrasive, aggressive and toxic media
 

FELUWA Piston Diaphragm Pumps

Wherever abrasive, aggressive and toxic media are conveyed, the hermetically sealed, oscillating displacement pumps from FELUWA are used.

FELUWA technology offers optimal pump systems to the customers for various applications, even for extreme operating temperatures and heterogeneous mixtures with high solids content.

Pressure: up to 500 bar 7250 psi
Flow rate: up to 1.000 m³/h  4400 gpm 
Drive power:  up to 5.000 kW 6700 hp
MULTISAFE® Double hose-diaphragm pump in quintuplex design at the FELUWA test rig.

The unique, patented MULTISAFE® technology with the hermetically sealed redundant double hose-diaphragms ensures double safety for transportation of critical and environmentally hazardous fluids.

Two hose-diaphragms, arranged one inside the other, are fixed in the pump head. These hose-diaphragms enclose the medium ensuring double separation of the hydraulic drive end.

Three sets of Hose diaphragm piston pumps, quadruplex design at coal gasification.

With the FELUWA hose diaphragm piston pump, the commonly utilised principle of a flat diaphragm has been extended by the additional provision of a flexible hose-diaphragm so that the conveyed fluid is in direct contact with the inside of the hose-diaphragm and check valves only. Wet end and drive end of the pump are separated by a flat diaphragm and a hose-diaphragm.


Video: "Heart of Steel"

In order to guarantee technical excellence to the customer, the custom-made pumps will only leave the FELUWA factory after they have proven effectiveness in an endurance test. All essential parameters like pressure, volume flow and temperature are verified and recorded.

Check out the process of our pump production in our image film "Heart of Steel" (7 min).


Applications of FELUWA Piston Diaphragm Pumps

With their almost linear flow without deviations and minimum wear FELUWA pumps are especially suitable to handle aggressive and/or abrasive, solids carrying media, e.g mine slurries and waste materials - even at high viscosity.

The linear flow path of the medium and the fact that it is only in contact with the internal hose-diaphragm and the check valve reduces erosion and corrosion to a minimum. Aggressive and abrasive fluids are not in contact with the pump casing rendering special materials, resistant to the medium, unnecessary.


The Evolution of Diaphragm Pumps

1. Diaphragm Piston Pumps (developed in 1960)

For a long time, diaphragm pumps or diaphragm piston pumps have been used for the handling of media in industrial applications. Internal parts of such pumps (diaphragm housing and pump cover for example) are in direct contact with the conveyed fluid so that in many cases (especially when handling corrosive slurries) expensive construction materials are required that are chemically resistant to the conveyed fluid. In addition, failure of single diaphragms results in damage to the hydraulic end of the pump (pistons, cylinder liners, etc.) and high cost for wear parts and downtime.

Diaphragm condition monitoring requires elaborate and sensitive conductivity measurement systems in the hydraulic chamber.

 

 

2. Hose Diaphragm Piston Pumps (developed 1970)

In order to avoid the disadvantages of traditional diaphragm pumps, FELUWA has developed its hermetically sealed, leakproof, reciprocating displacement pump, the aptly named Hose Diaphragm Piston Pump. This pump has been successfully operated in worldwide applications for 40 years. It is characterised by an extraordinarily high technical and economic value.

With the FELUWA hose diaphragm piston pump, the commonly utilised principle of a flat diaphragm has been extended by the additional provision of a flexible hose-diaphragm so that the conveyed fluid is in direct contact with the inside of the hose-diaphragm and check valves only. Wet end and drive end of the pump are separated by a flat diaphragm and a hose-diaphragm.

The second actuation fluid between flat and hose-diaphragm serves as hydraulic coupling and safety aid for leak detection. A mechanical valve system in the hydraulic chamber ensures automatic control and compensation of the actuation fluid volume without additional oil pump and control unit. Even in the event of a hose-diaphragm failure, the secondary diaphragm ensures that the slurry will not enter the hydraulic drive end so that operation can be maintained. This contributes to low costs for wear parts and high availability.

3. MULTISAFE® Double Hose-Diaphragm Pumps (developed 2002)

Although hose diaphragm piston pumps already represent significant advantages over diaphragm pumps with several thousand units being well proven, consistent further development has been pursued with the MULTISAFE® double hose-diaphragm process and transportation pump. Basically, it is a hermetically sealed, leak-proof, oscillating displacement pump with double sealing of the wet end from the hydraulic drive end and the environment by means of two hose-diaphragms, which are arranged one inside the other. The flat diaphragm is fully abandoned.

MULTISAFE® pumps utilise an overall diagnostic system for permanent condition monitoring of primary and secondary hose-diaphragms (by means of pressure sensors), check valves (FELUWA Valve Performance Monitoring System – FVPMS), suction pressure as well as hydraulic and gearbox oil temperature. Double hose-diaphragm pumps are characterised by unique design features and advantages.


Drives and Motors

FELUWA stroke and reduction gearboxes and crankdrives

The conversion of the rotary motion of the motor output shaft into a reduced axial reciprocating action of the pump piston or plunger is achieved by powerful combined FELUWA stroke and reduction gearboxes or by a combination of FELUWA crank drives with separate gear units. Both drives are available in various ratings for a maximum power transmission of 5,000 kW.

Drives made by FELUWA

Design and development of these units are based on high reliability and long service life. Fabrication, assembly and factory performance tests are carried out by a well educated and trained expert team. Innovative fabrication and machining methods, proven material qualities and calculation systems for component and design strength ensure that customers may rely on high availability even under the most arduous of conditions.

In order to offer maximum safety, finite element method (FEM) is applied for dimensioning and design. All bearings of driving and crank shafts are designed as large antifriction bearings with an expected service life of 100,000 hours plus.

 

Drive options

Electric motors for stationary operation

  • Mainly asynchronous three-phase current motors
  • Standard enclosure
  • Flameproof enclosure (Ex) acc. to ATEX
  • Low or medium voltage

Variable frequency drives

  • Low or medium voltage

Internal combustion engines for mobile applications

  • Diesel engines
  • Petrol engines

Static displacement drives for existing hydraulic systems

  • Stationary and mobile application
  • Fluid power motors

Pumping of heterogeneous mixtures and fluids containing coarse contaminations calls for custom-tailored solutions to ensure permanent trouble-free operation.

In order to avoid disadvantageous sedimentation, MULTISAFE® double hose-diaphragm pumps literally turn the traditional pumping principle upside down, which means flow from the top to the bottom.
The DownFlow Technology is therefore specially designed for the handling of particularly heavy solids and herterogeneos mixtures.


Quality assurance at the test rig

In order to guarantee technical excellence to the customer, the custom-made pumps will only leave the FELUWA factory after they have proven effectiveness in an endurance test. All essential parameters like pressure, volume flow and temperature are verified and recorded.

The pumps, their drive technology, measuring and regulation technology as well as the complementary products are synchronized at the FELUWA test rig so that the pumps are ready for use immediately after the commissioning on site by the FELUWA service engineers.

The implemented quality management system according to DIN EN ISO 9000:2008 ensures that a uniform and constant design and fabrication level is maintained.

 

Test procedures - Fabrication

  • Dimensional check agains fabrication drawing
    Actual-theoretical comparison with an accuracy of +/- 0.016 mm
  • Hardness test: Shore A measurements acc. to DIN 53505 for elastomere und synthetic materials (flat diaphragms and hose-diaphragms)
  • Brinell measurement system (HB) acc. to DIN 50351 for unhardened steels
  • Rockwell measurement system (HRB/HRC) acc. to DIN 50103 for hardened steels
  • Coating thickness test acc. to DIN EN ISO 2178
  • Surface test
    Ra, Rz, Rmax nach DIN 4768 and Rmr acc. to DIN EN ISO 4287
  • Liquid penetration test PT DIN EN 571-1
  • Liquid penetration test PT DIN EN ISO 9934-1

Test procedures - Pump test rig

  • Pressure test according to AD-Merkblatt HP30 and/or TRBF
  • Flow measurement at specified pressure and number of strokes
  • According to ISO 5168, VDI/VDE 2040, VDI/VDE 3513
  • Noise level measurement according to DIN 45 635
  • Absorbed power

Dowload Certificate ISO 9001:2008

 

For the good of the environment

FELUWA wants to contribute to environmental sustainabilty and sensible handling of our natural resources. Therefore, FELUWA has succesfully implemented a certified environmental management system according to DIN EN ISO 14001.

Download Certificate ISO 14001:2004

 

If you are interested in further information on our environmental management system, please send an email to umwelt[at]feluwa.de.


Contact us

We are pleased to provide customized advice. Please fill in the form without obligation and we will come back to you. We are looking forward to your message.

Manfred Braun

Regional Sales Manager
Europe, Japan, Russia
Phone: +49 (0) 6594 10 155
Fax: +49 (0) 6594 10 255
E-Mail: braun[at]feluwa.de

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