ISO 10816-5 pdf download – Mechanical vibration- Evaluationof machine vibration by measurementson non-rotating parts 一 Part 5: Machine sets in hydraulic power generating and pumping plants.
The criteria are applicable mairy for the vibration produced by the machine set itself. Special considerations should be made when necessary lot vibration transmitted to the machine set from external sources.
2 Normative references
The following normative documents contain provisions which, through reference in this text. constitute provisions of this part of ISO 10816. For dated references, ssequent amendments to, or revisions of. any of these publications do not apply. However, parties to agreements based on this part of ISO 10816 are encouraged to investigate the possibility of applying the most recent editions of the normative documents Indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and lEG maintain registers of currently valid International Standards.
ISO 10816-1:1995. Mocflanicai vibration — Evakiat,on ol machine vibration by measurements on non-rotating parts — Pair f. General guidelines.
lEG 60994, Guide for field measurement of vibrations and pulsat,ons in hydraulic machines (turbines, storage pumps and punp-flirbnes).
3 Machine arrangements
Significant differences In design and arrangement of hypaulic machine sets require a sepaf ation mo tour pnnclpal groups with regard to the radial bearing stiffness, as follows
Group 1: Horizontal machine sets with pedestal or end-shied bearings mounted on a rigid foundation, usually with operational speeds of above 300 rimin.
Group 2: Horizontal machine sets with bearing housings which are only braced against the casing of the hydraulic machine. usualy with operational speeds of less than 300 i/mm.
Group 3: Vertical machine sets with beanng housings which are all braced against the foundation, usualy with operational speeds of between 60 r/rnin and 1 800 i/mm,
Group 4: Vertical machine sets with lower bearing housings braced against the foundation and upper bearing housings braced against the generator stator only. usually with operational speeds of between 60 i/mm and 1000 rmm.
NOTE Unrelta-Iype machines beleng to Group 4.
Absolute bearing housing vration measurements are commonty made on hydraulic machine sets using seismic transducers measuring Itie vibration velocy v,,, In millimetres per second or, after electronic integration, the vibration displacement in micrometres The vibration displacement can also be measured directly as a relative quantity using £lacement transducers m the case where a rigid non-vibrating support can be found.
Because of the special nature of the vibratory behaviour of hydraulic macxnes and their different speed ranges, these quantities have favoured ranges of application as follows:
a) For low-speed machines (below 300 r/mwi), the preferred measurement quantity is the vibration displacement lithe spectrum is expected to contain high-frequency components, the evaluation should normally be
based on broad-band measurements of both displacement and velocity.
b) For medium- and high-speed machines (300 rlmpi to 1 800 rin,iri), the preferred measurement quantily is the vibration velocity v. It the spectrum is expected to contain low-frequency components, the evaluation should normally be based on broad-band measurements of both velocity and displacement.
4.3 Measurement locations and directions
Measurement tasks A and B (see clause 1) requwe measurements to be taken on exposed parts of the machine that are normally acoessible and are representative locations for the so-called force flow in the supporting structure, for example on all main bearings of me machine set. Tical examples of measurement localions for hydraulic machines are shown In Figures Ito 5.
Care shall be taken in this context to ensure that measurements reasonably represent the vibration of the bearing housings and do net include any local resonance or amplification. The locations arid directions for vibration measurements shall be such that they provide adequate sensitivity to the dynamic farces of the machine under various operating conditions. Typicaly. this will often require two orthogonal radial measurement directions on each bearing cep. pedestal or housing For low-speed machines with a horizontal shaft axis, such as bulb-turbines as shown in Figure 2. the measurement locations and directions shall be determined with great care.
ISO 10816-5 pdf download – Mechanical vibration- Evaluationof machine vibration by measurementson non-rotating parts 一 Part 5: Machine sets in hydraulic power generating and pumping plants
