ISO 7919-3 PDF

ISO MECHANICAL VIBRATION – EVALUATION OF MACHINE VIBRATION BY MEASUREMENTS ON ROTATING SHAFTS – PART 3: COUPLED . Mechanical vibration – Evaluation of machine vibration by measurements on rotating shafts – Part 3: Coupled industrial machines (ISO. Full text of “IS/ISO Mechanical vibration – evaluation of machine vibration by measurements on rotating shafts, Part 3: Coupled Industrial Machines”.

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These guidelines are presented in terms of both steady running vibration and any amplitude changes which can occur in these steady values. One criterion considers the magnitude of the observed broad-band relative shaft vibration; the second considers changes in magnitude, irrespective of whether they are increases or decreases.

Change in vibration magnitude This criterion provides an assessment of a change in vibration magnitude from a previously established reference or baseline value for particular steady-state conditions. This does not preclude the free use, in course of imple- menting the standard, of necessary details, such as symbols and sizes, type or grade designations.

For undated references, the latest edition of the referenced document including any amendments applies. Copyright BIS has the copyright of 79919-3 its publications. The vibration of newly commissioned machines normally falls within this zone. Attention is particularly drawn to the following: Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee.

Machines with vibration within this zone are normally considered unsatisfactory for long-term continuous operation. In such cases, it is normally necessary to explain the reasons for this and, in particular, to confirm that the machine will not be endangered by operating with higher vibration values.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. These values are not intended to serve as acceptance specifications, which shall oso subject to agreement between the machine manufacturer and the customer.

Such things are often in the Tech manual. In industrial machines, shaft vibration relative to the bearing is normally measured. Different operational limits, reflecting differences in dynamic loading and support stiffness, may be specified for different measurement positions and directions.

Details and advice can be obtained from iiso Copyright and Licensing Manager.

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Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. They apply for normal slow changes in load but do not apply when different conditions exist or during transient changes, for example during start-up and shut-down and when passing through resonance ranges. If the steady-state baseline changes for example, after a machine overhaulthe ALARM setting should be revised accordingly.

This second edition cancels and replaces the first edition ISO In particular, the conditions for in-situ operation, performing acceptance tests and the influence of bearing clearance given in ISO shall be taken into account when evaluating the shaft vibration of pumps This part of ISO is neither applicable to land-based steam turbine-generator sets for power stations with outputs greater than 50 MW see ISOnor machine sets in hydraulic power generating and pumping plants with outputs of 1 MW or greater see ISO BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.

It presents the UK view on standards in Europe and at the international level. In particular, it should be recognized that the allowable vibration can be related to the journal diameter since, generally, running clearances will be greater for larger diameter bearings. ISO consists of the following parts, under the general title Mechanical vibration — Evaluation of machine vibration by measurements on rotating shafts: A list of organizations represented on this committee can be obtained on request to its secretary.

This Indian Standard has been developed from Doc No.: When Criterion II is applied, the vibration measurements being compared shall be taken at the same transducer location and orientation, and under approximately the same machine operating conditions.

Where there is no established baseline for example, with a new machine the initial ALARM setting should be based either on experience with other similar machines or relative to agreed acceptance values. Machines with vibration within this zone are normally considered unsatisfactory for long-term continuous operation. General guidelines [2] ISOMechanical vibration — Evaluation of machine vibration by measurements on non-rotating parts — Part 3: In particular, the conditions for in-situ operation, performing acceptance tests and the influence of bearing clearance given in ISO shall be taken into account when evaluating the shaft vibration of pumps This part of ISO is neither applicable to land-based steam turbine-generator sets for power stations with outputs greater than 50 MW see ISOnor machine sets in hydraulic power generating and pumping plants with outputs of 1 MW or greater see ISO The vibration of newly commissioned machines normally falls within this zone.

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BSI also holds the copyright, in the UK, of the publications of the international standardization bodies.

ISOMechanical vibration of non-reciprocating machines — Measurements on rotating shafts and evaluation criteria — Part 1: However, it should be noted that for diagnostic purposes it might be desirable to cover a wider frequency range.

ISO 7919-3 | AMP Maintenance Forums

Consequently, it can be difficult to identify the effects of the crack propagation by looking at the change in the broad-band vibration only. The maximum shaft vibration magnitude observed at each bearing is assessed against four evaluation zones established from international experience. In industrial machines, shaft vibration relative to the bearing is normally measured.

Rotodynamic pumps for industrial applications, including measurements on rotating shafts 7 Bureau of Indian Standards BIS is a statutory institution establislned under tine Bureau of Indian Standards Act, to promote 79919-3 development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. If only one measuring direction is used, care should be taken to ensure that it provides adequate information see ISO However, it should be noted that for diagnostic purposes it might be desirable to cover a wider frequency range.

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79193- guidelines [2] ISOMechanical vibration — Evaluation of machine vibration by measurements on non-rotating parts — Part 3: Generally, the machine may be operated for a limited period in this condition until a suitable opportunity arises for remedial action. Y 90 80 70 60 50 40 30 20 10 a! For details of these and izo benefits contact Membership Administration. Hence, the specification of detailed criteria for measurements of this type is beyond the scope of this part of ISO Caution should be exercised when using the criteria presented in Annex A to ensure that no contact occurs between the rotating shaft and stationary parts.