Vibration Protection
for Pumps

Elastic Decouplingof Pumps

Noise and vibrations are reduced by
the elastic decoupling of pumps

The application
Whether a pump is conveying gaseous or liquid media is irrelevant– they all share a common feature:pumps generate vibrations and hence
secondary airborne noise. An effective way of isolating these vibrations
is to elastically decouple the pump.
This can be done directly on thepump (e.g. machine base) or under
the pump foundation(e.g. foundation bearing).
he best results are obtained when
the resilient bearing of the pumpis considered at the design andplanning stage. Every manufacturer
benefits from a smooth and stable
operation. A resilient bearing can also
be introduced during the installation
and assembly of the pump. The
retrofitting of existing systems – usually using sandwich elements or afoundation bearing – is also possible.

T

Advantages of a resilient bearing
Installing a resilient bearing for apump in a professional mannerprotects the surroundings and thepump from vibrations. If there is novibration, e.g. in a building, then novibration can be transmitted; thepump itself is also protected from theeffects of external vibrations.
This increases the service life of all
items in the vicinity, e.g. machineryand buildings, including that of thepump itself.

If the vibrations generated by a pump
act on a vibrating mass, such as aceiling within a building, then thesebody-mass vibrations can be transformed into airborne noise. Thissecondary airborne noise is one of
the main reasons for increased noiselevels around pumps. An elastic
decoupling can significantly reduce
secondary airborne noise, and lower
noise levels result in better working
conditions in the vicinity of machinery. A resilient bearing made from
Sylomer® or Sylodyn® is maintenance-free. The individual polyurethane bearings can be tailored to therequirements of the particularinstallation, which means that every
bearing is able to achieve the highest

possible level of effectiveness. The
material properties of the bearing
remain unchanged over the entire
service life of the pump and guarantee that the bearing remains maintenance-free.
The broad selection of standard
polyurethane materials and the ability
to cut them to size as required
enables bearings to be provided forpumps ranging from just a few
kilograms to several tonnes. Depending on the nature and thickness of thebearing, natural frequencies of up to7 Hz are possible.

Decoupling ofceiling hanger

Options for the elastic
decoupling of a pumpResilientseal

Resilient machinebase

Insulation ofpipeworkDamping vibrations efficiently:
decoupling pumps and pipework

Advantages of a resilient
pump bearing

Challenge

Service provision

A customised bearing for a pump will
only be effective if all the framework
conditions are considered and included in the calculation. Therefore, it isimportant to ensure that elastic
connectors (e.g. compensators) areselected. In addition to the material
recommendation, all the relevant
parameters for the resilient bearing,such as its static deflection andnatural frequency, can be calculated.

Getzner Werkstoffe has been providing pump bearings around the world
for decades and offers the following
range of services:— Customised calculations for every
bearing – to achieve the highest
levels of effectiveness— Support during design and development – to achieve the most efficientand cost-effective solution— Help in conjunction with othermaterials (e.g. surface coatings,recommended bonders)— Decades of experience in the designof pump bearings— Development of all materials in ourin-house laboratory

Vibration reduction with a resilient bearing
Leq / dB

The centre of gravity distribution of
the pump must also be taken into
account in the calculation to counterany tendency of the pump to tip over.
Floor bolts should be elastic in design
rather than rigid to prevent themtransmitting structure-borne noise.
Climatic influences often pose afurther challenge. Frequent temperature changes, the effects of water andthe sun cause brittleness and a loss ofeffectiveness to conventional bearings(e.g. rubber). Pump bearings madefrom Sylomer® and Sylodyn® areresistant to hydrolysis and UV. Thematerials remain fit for purpose overthe entire service life of the pump
– and in a temperature range of -30 °C
to 70 °C. Temperatures lower andhigher than these for short periods
only result in a brief reduction in
effectiveness and cause no lastingdamage to the materials.

— Longer service life of the pump
— Fewer vibrations— Lower noise levels— Maintenance-free bearings— Smoother operation— Customised calculations— Various bearing sizes

140120100

Resilient bearing of afeed pump with fourSylomer® SR 220 point
bearings, natural
frequency 12 Hz

80

Result: noticeable
reduction in thetransmission of vibrations
to the building

60

40
Feed pump without
resilient bearing

20

Feed pump withresilient bearing
0025

50

75

100

125

150

175

200
f / HzHow Sylomer® SR, Sylodyn® and Sylodamp® work
Sylomer® – Universally applicableresilient PU material,
spring /damper combination

1Sylodyn® – Technical springwith pronounced dynamic,
highly elastic behaviour

0Sylodamp® – Damper withspecial energy-absorbing
properties

Transmission factor in dB-130

References

20

Renowned pump manufacturers around the world –manufacturers of heat pumps, water pumps, etc. –place their trust in the effectiveness and reliability ofGetzner.

100-10Vibration isolation-20

Natural frequencyof the resilient
bearing

Excitation frequencyof the pump

-30
0

1

2

345
Excitation frequency in f
Natural frequency in f0

Over the decades, bearings for a whole range ofpumps in the project business have been preparedwith the help of Getzner calculations.

Reference projects (extract from reference list)
TYPE OF PUMPPROJECT

COUNTRY

Water pump

Water supply pipelines

Saudi Arabia

Oil pump

Oil pump bearing for pipeline

The Netherlands

Feed pump

Elastic decoupling of oil feed pump for pipeline

Spain

Water pumpFoundation bearing for feed water pump, Mellach power station

Austria

AUSTRIA — Bürs GERMANY — Berlin — Munich — Stuttgart FRANCE — Lyon
JAPAN — Tokyo INDIA — Pune CHINA — Beijing USA — Charlotte

JORDAN — Amman
www.getzner.com

TB Pumps en Copyright by Getzner Werkstoffe GmbH | 11-2016

The installation instructions of numerous pump manufacturers even contain recommendations that theirproducts are mounted on Sylomer® and Sylodyn®
bearings from Getzner.