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1

What is the reason of being the UNE-EN 1299 norn?

UNE-EN 1299. Mechanical vibration and shock. Vibration isolation of machines. Information for the application of source isolation.

In order to meet the requirements of vibration protection, system optimization requires a detailed knowledge of all factors that influence the design and effective implementation of vibration isolation for a particular machine or system. Within this context, it is of paramount importance the exchange of information between the machine manufacturer, supplier and user isolatio.

In terms of its scope, the rule only refers to the isolation of the source.

An insulation system of the source may be necessary:
 

  • For the safety of the operators of vibrating machines.
  • For the safety of people close to vibrating machines.
  • For the safety of buildings or structures where the vibrating equipment.
  • For the safety of those buildings are likely to be subjected to intense vibrational excitation.
  • When values ​​exceed legislated limits vibration.

In addition to design measures that reduce the effects of vibration, use an insulation system of the source. Apply:
 

  • When designing or installing vibrating machines.
  • When designing or modifying the buildings, where vibrating machines are.


First, it is necessary to examine the vibration phenomenon and background vibration environment. It is important to record the variation of the vibration function of the time and analyze the characteristic frequencies for a sufficient time duty to the cycle of the machine. The analysis of the frequency response of the structures transmiting and receiving vibration provide the optimal choice of systems and avoid overlap between the dominant frequency of the source and the frequencies of these structures.

Measures should be in environmental conditions representative of the location of the machine.

The measurements and analysis should help to understand the origin of the problem and to provide the extent possible information on possible solutions. The measures should be carried out under an appropriate standard, and this should be identified.
The selection of the insulation system must consider not only the static characteristics of the machine but also its dynamic characteristics and dynamic characteristics of the structure around it (and other sources).

There are basically three streams of information that should be considered in depth:
 

  • Information to be provided by the manufacturer of the machine.
  • Information to be ask by the manufacturer of the machine to the user.
  • Guidelines for the validation of the effectiveness of the insulation.

2

What kind of information must be supplied by the manufacturer of the machine?

Manufacturer should provide the user with the maximum of the following information to ensure proper installation, using, if necessary, the supplier of vibration isolation. We will provide information on the machine and isolation. As regards the physical data of the machine have included:

1. A map of the machine including:
 

  • The installation and configuration of the machine.
  • The global dimensions.
  • The total weight, location of center of gravity and rotational inertia.
  • Specifications for the size of anchor bolts and special connections for attaching the machine.


2. Vibration excitation. To ensure safe installation and use of the machine, describe the excitement generated vibration.

3. Specifications.
 

  • The electrical connections, ducts, conduits or pipes which may alter the mechanical response of the assembly system (type, size, stiffness ...).
  • The forces and moments applied externally.
  • The areas of access required.
  • The minimum tolerance needed for the circulation of cooling air.
  • We must indicated on the map any temperature gradient that could affect the operation of the isolator and must be expected temperature range.
  • Electrical characteristics. Must appear in the plane, in the form of notes, the provisions for grounding and applicable specifications.

4. Particular specifications for mechanical stability. Specifications must be specific for mechanical stability. For example, you may need special attention to the teams that have a high center of gravity.

On the other hand, will also include information necessary for the physical data of the insulation system, which can be distinguished:

1. General information.
The supplier of the insulation system must provide detailed information on the characteristics of it: the type of system, materials, weight, leveling characteristics, the static stiffness of the isolators, the maximum and minimum (Newtons) in the conditions operation of the machine, the size and location of isolation (eg a picture) and the aging of the insulators due to the load and time.

2. Dynamic behavior. The supplier should describe the dynamic behavior of the insulation system, in terms of dynamic stiffness.

The dynamic behavior may be related to variations of the following input parameters: resonant frequency depending on load, amplitude, temperature and buffer.

3. Durability. The supplier must provide information on the durability or better on the change of physical characteristics such as:
 

  • The time limit associated with the deformation and repeated shocks.
  •   When necessary, the data of elongation (permanent deformation) and how they were obtained.
  • The effects of the passage of time due to storage / use in certain environments, taking into account the maximum and minimum temperatures.



4. Environmental conditions.
The supplier must provide the following information from the isolators to ensure proper use:
 

  • Temperature limits above and below from which the insulator under nominal loads do not perform their function properly or suffer permanent modifications of their characteristics.
  • The ability of the insulator to resist corrosion or damage caused by factors such as humidity, water, oils, fuels, corrosive fumes, sun, etc.
  • The ability to function in adverse conditions, for example in an atmosphere full of sand or dust.
  • The service environment acceptable.


5. Maintenance data. The supplier should provide details on requirements for maintenance, regular inspection and service.

 

 

 

3

What information should ask the manufacturer of the machine to  the user?

1. Technical information about the peripheral structure of the machine.

It should be a brief description to have a good understanding of the technical characteristics of the proposed locations. This information should include:
 

  • The type of structure to be mounted on the machine (ship building steel structure, concrete structure building, etc.).
  • The location in the structure (engine room, main deck, roof, etc..).
  • The data support structure (type of soil, soil allowable load, natural frequency and mobility of the support structure, etc.)..
  • The effectiveness of the insulation or the user acceptance criteria (the neighborhood, for example a residential or industrial areas, the type of neighboring machines.)

2. Status of vibrations and shocks of the peripheral structure.

Before installing the machine is to describe the situation of vibrations and shocks of the peripheral structure based on the vibration amplitude (displacement, velocity or acceleration), the corresponding frequencies and the duration during which they occurred. The registration function of time, spectral analysis and other descriptive parameters.

3. Climatic environment.
When necessary, the user must provide the following information on the climatic environment: the limits of upper and lower temperature, humidity, the presence of water, sand or dust, oils, solvents, radiation, etc..

4

Which are the guidelines for validating the effectiveness of isolation in a facility?

Normally, the isolated machine supplier of insulation systems must test the effectiveness of vibration isolation in the structure around the machine. This efficiency should be evaluated by an experimental method. Values ​​should be contractual limits accepted by the supplier.

5

What is the reason of being the UNE- 1001253 IN?

UNE - 1001253 IN. Air conditioning. Vibration isolators. Selection criteria.

The purpose of this rule is to establish criteria to be follow in her choice of elastic supports, to be installed between equipment and pipes with vibrational motions on one hand, and, secondly, the structure of the building to reduce vibration transmission and noise.


Vibration isolation.

This section of the standard, is a table (see the Standard) which indicates the minimum deflection (mm) of vibration isolators to be installed between the base or base of the team and the support structure for different types equipment, also differentiated according to their power or speed, and depending on the light of the structure on which they rest.

Where the possibility of supporting a machine on the ground or in a basement, may not be required the installation of vibration, provided that the manufacturer does not require protection of the machine itself. In these cases, the machine will rest on a concrete block, whose mass should be one or two times that of the machine and should not be in contact with the structure of the building.

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