Marine Services

PNEUMAFLEX

• Clutch torques of up to 304 kNm
• Pneumatic switchable
• Reliably interrupts or establishes the flow of power

Experience since 1964 - proven reliability

The PNEUMAFLEX clutch is a combination unit comprising a double conical friction clutch and highly elastic coupling. The clutch components comprise two inner friction cones which are pressed against two outer friction conical faces via the pneumatically actuated clutch cylinder.

The elastic section consists of parallel-arranged rubber elements whose optimized design can support the reliability and power transmission performance of the coupling.

Due to the high torsional flexibility of the rubber elements, PNEUMAFLEX KA clutches shift resonance (torsional vibration) between the natural frequencies of the system and the exciting frequencies of the driving and driven machines across the operational speed range. Due to their high damping qualities, they also reduce the residual vibration amplitude and thus protect the valuable assets.

Moreover, the clutch compensates center mismatch, in both axial as well as angular misalignment, for connecting machinery elements (engines, gearboxes, generators, etc.) within a predetermined tolerance range. Additionally, the rubber elements effectively isolate structure-borne noise.

Your benefits at a glance

• Combination of a dry friction clutch and highly elastic coupling without short-lived idle bearing system
• Complete separation of primary and secondary sides
• Backlash-free, no wear of components subject to backlash
• Smooth and easily controllable engaging operation
• Protects the propulsion system against overloads if a slip monitoring unit is used
• Clutches of type KAP can be vertically removed

PNEUMASTAR

• Torsionally stiff clutch torques up to 1400 kNm
• Pneumatic switchable

Smooth engagement

The PNEUMASTAR is a torsionally stiff, double-cone, friction clutch. The clutch components consist of two inner and two outer friction cones which are pneumatically pressed against the outer tapered friction faces via a pneumatically operated clutching cylinder. Rubber sleeve springs form the torsionally stiff portion of the clutch.

Due to the high resilience of the rubber sleeve springs, the PNEUMASTAR coupling can compensate for radial, axial and angular misalignment within predefined limits. Wear caused by axial relative movement between contacting components can also be reduced when the coupling components move via the rubber sleeve springs during operation. Pneumatic actuation of the coupling supports fast and precise maneuvering.

Pneumatic operation of the clutch enables speedy and precise manoeuvring, which is a prerequisite for use in the marine application.

Your benefits at a glance

• For stiff, but interchangeable connections
• Backlash-free, no wear to components subject to backlash
• Smooth and easily controllable engaging operation
• A range of clutch types are available with different connections

Clutch Control Unit (Box 70/PFA 8600)

There is an electro-pneumatically operated remote clutch control device available for PNEUMAFLEX and PNEUMASTAR clutches, which performs the following functions:

• Adjustment of the engaging time
• Compressed air failure alarm signal
• Automatic disengagement of blocking of clutch operation if the standard solenoid valves have been actuated by external interlocking devices
• Automatic changeover from engaging air pressure to working air pressure
• Automatic disengagement of the clutch if the working air pressure falls below the value required for slip free torque transmission

The pneumatic control system might lose a bit in functionality over time due to various ambient conditions on board. Air leakage, dirt, even grease or oil in the valves or hoses inside the box may lead to catastrophic events such as a frozen clutch or failure in engaging / dis-engaging, resulting in reduced operational reliability.

To help avoid this, only a small investment is required for the switch-over control cabinet developed by Flender B.V. The cabinet enables the installation of a quick-change system on board. A switch-over control cabinet can help reduce downtime caused by malfunctions, and our service team supports the repair of damaged control cabinets in our workshop. Defective cabinets are inspected, quotations are prepared for faulty parts, and repairs are carried out after customer approval. Repair costs are limited to the replaced parts.

Electronic Slippage Monitoring Device CA

Clutch slippage is checked by the electronic monitoring device CA which has been designed to:

• Indication of coupling slip caused by overload
• Contactless operation
• Support for the early detection of impermissible loads
• Additional safety through support in identifying overload-related operating conditions

The CA slip monitoring device indicates impermissible slip in PNEUMAFLEX and PNEUMASTAR couplings. Its monitoring function is based on measuring the speed difference between the primary and secondary sides of the coupling.

The device operates without contact, preventing mechanical wear between the measuring elements. The use of integrated circuits supports a high level of functional reliability.

Spiroflex

• Highly elastic shaft coupling for torques up to 928 kNm
• Compensation of alignment errors
• High damping characteristics

Flexible solution for shaft connections

The elastic rubber elements have been extensively optimized and can help support the reliability and transmission performance of the coupling. The most significant feature of the coupling is its rubber high torsionally flexible elements. Moreover, the coupling compensates center mismatch, axial as well as angular misalignment of the shafts and machinery elements, to be connected (engines, gearboxes, generators etc.) within a predetermined tolerance range.

The coupling is especially suited for use in diesel engine propulsion systems and installations where torsional vibration must be considered.

Various rubber hardness grades effectively address the natural frequencies arising in the respective drive system.

SPIROFLEX KS couplings shift resonance (torsional vibration) between the natural frequencies of the system and the exciting frequencies of the driving and driven machines. Due to their high damping qualities they also reduce the residual vibration amplitude and thus protect the valuable plant. Additionally, the rubber elements isolate structure-borne noise effectively.

Sizes KS 100 to KS 370 are designed with ring elements EJN while sizes KS 390 to KS 530 are fitted with four EJK segments which together form a ring element.

Your benefits at a glance

• Elements can be removed radially
• Exclusively features frictionally locked connection
• Backlash-free torque transmission
• Flywheel connecting dimensions acc. to DIN 6288

DENTILUS gear couplings

• Easy to mount / dismantle
• Two-piece housing

High performance, low maintenance

DENTILUS gear couplings of the AS-, AG- and AV- type, formerly branded as Lohmann & Stolterfoht, are designed with crowned teeth and are used where torques must be transmitted through shafts that are subject to movement in all axis’s. The gear couplings can compensate angular, radial and axial misalignments.Bruinhof Marine utilizes these couplings for marine applications such as generators, (dredge/jet) pumps, cutter drive shafts and other shaft-to-shaft connections.

Your benefits at a glance

• Suitable for reverse operations
• Quiet operation due to head centering
• Special design for vertical operation available
• Large permissible finish bore
• Easy replacement of seals with split cover
• High level of operational reliability due to high quality materials
• Long service life with low levels of maintenance
• High ambient temperatures possible
• Interchangeable with preceding series

AXILUS thrust- and RADILUS shaft bearings

• Bearing design tailored especially for shipbuilding applications
• Self-lubricating operation, despite highly inclined positions
• Noise and vibrations during operation are generally low

Absorbing the propeller thrust

The wide range of LRL/LRH RADILUS shaft bearings and LAR/LAK AXILUS thrust bearings, formerly branded as Lohmann + Stolterfoht, are designed for either intermediate radial shaft support, or to take over axial thrust force out of the driven machine, or both at the same time. The bearings are supplied with white metal linings in the shell and suitable for shaft diameters between 110 and 850 mm. Various configurations are available, such as with / without built-in cooler, shaft load monitoring equipment, forced lubrication and similar features.

Your benefits at a glance

• Self-lubricated
• Low maintenance
• Reliable

Maintenance Supports the Availability of Industrial Equipment Worldwide

Inspections and preventive maintenance measures must be carried out regularly, particularly on machinery operating continuously under harsh environmental conditions. The purpose of inspections is to identify and assess the current condition of equipment through visual inspections or endoscopic examinations. The service includes a final report with recommendations.

To help reduce unplanned downtime, we offer a worldwide troubleshooting service for your equipment. The scope of service includes fault finding, root cause identification, repair or replacement of defective components, and preparation of a final report.

Your benefits at a glance

• Support for high equipment availability
• Repairs performed to manufacturer quality standards
• Transparency regarding completed services and spare parts used through repair reports

Predictive Maintenance Supports the Performance of Your Machines

Support the availability of your equipment with our predictive maintenance service. Regular maintenance activities tailored to the age and operating hours of installed machines help maintain reliable operating conditions.

Your benefits at a glance

• Planned maintenance periods instead of unplanned production downtime
• Inspection and predictive maintenance intervals tailored to operating conditions
• Support for high plant productivity and machine Performance

A. Friedrich Flender AG took over the gear unit portfolio and as such Bruinhof B.V. became part of that transaction, becoming their lifecycle support partner. The Lohmann + Stolterfoht NAVILUS range was re-branded as Flender NAVILUS. The DENTILUS gear couplings were sold to Malmedie Solingen and the AXILUS and RADILUS shaftline bearings acquired by Renk Hannover. The Spiroflex, Pneumaflex and Pneumastar products became part of the Bosch Rexroth portfolio (today ZF). Despite all these changes, and due to the extensive knowledge on product lifecycle, the new portfolio owners reinstated Bruinhof B.V. as their product and service representative.

As a result of the Siemens AG takeover of Flender in 2005, Bruinhof B.V. have been integrated into Siemens Netherlands N.V. with effect from February 2009.

Through a renewed global marine business engagement at corporate level as well as a focus on lifecycle services in 2011, Bruinhof Marine was assigned as the international center of competence for all marine mechanical drives and associated lifecycle support by Siemens.

Bruinhof Marine therefore became responsible for worldwide repair, service, modernization-modification, commissioning, parts supply and technical support for all current Flender and former Lohmann + Stolterfoht Marine drive systems and components. This comprises gearboxes, couplings/clutches, oil supply systems/heat exchangers and journal bearings.

To fulfil a role in the changing market, faced with increasingly fierce competition from Asia and price pressure from overcapacity, Siemens decided to transform their Mechanical Drives Business Unit into a standalone company within Siemens. In September 2018 Bruinhof Marine became a new legal entity as Flender B.V.

Flender Netherlands B.V.

Postal address:

PO Box 9607
3007 AP Rotterdam
The Netherlands

Visiting address:

Boterdiep 37
3077 AW Rotterdam
The Netherlands
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Billing address:

Attn.: Accounts payable
PO Box 9607
3007 AP Rotterdam
The Netherlands
flender.cred.efact.nl@flender.com

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