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ISO 20816-2:2017

Mechanical vibration - Measurement and evaluation of machine vibration - Part 2: Land-based gas turbines, steam turbines and generators in excess of 40 MW, with fluid-film bearings and rated speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min
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ISO 20816-2:2017

Mechanical vibration - Measurement and evaluation of machine vibration - Part 2: Land-based gas turbines, steam turbines and generators in excess of 40 MW, with fluid-film bearings and rated speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min

PUBLISH DATE 2017
ISO 20816-2:2017

ISO 20816-2:2017 is applicable to land-based gas turbines, steam turbines and generators (whether coupled with gas and/or steam turbines) with power outputs greater than 40 MW, fluid-film bearings and rated speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min or 3 600 r/min.

The criteria provided in ISO 20816-2:2017 can be applied to the vibration of the gas turbine, steam turbine and generator (including synchronizing clutches).

ISO 20816-2:2017 establishes provisions for evaluating the severity of the following in-situ, broad-band vibration:

  • a) structural vibration at all main bearing housings or pedestals measured radial (i.e. transverse) to the shaft axis;
  • b) structural vibration at thrust bearing housings measured in the axial direction;
  • c) vibration of rotating shafts radial (i.e. transverse) to the shaft axis at, or close to, the main bearings.

These are in terms of the following:

  • - vibration under normal steady-state operating conditions;
  • - vibration during other (non-steady-state) conditions when transient changes are taking place, including run up or run down, initial loading and load changes;
  • - changes in vibration which can occur during normal steady-state operation.

ISO 20816-2:2017 is not applicable to the following:

  • i) electromagnetic excited vibration with twice line frequency at the generator stator windings, core and housing;
  • ii) aero-derivative gas turbines (including gas turbines with dynamic properties similar to those of aero-derivatives);

NOTE ISO 3977‑3 defines aero-derivatives as aircraft propulsion gas generators adapted to drive mechanical, electrical or marine propulsion equipment. Large differences exist between heavy-duty and aero-derivative gas turbines, for example, in casing flexibility, bearing design, rotor-to-stator mass ratio and mounting structure. Different criteria, therefore, apply for these two turbine types.

  • iii) steam turbines and/or generators with outputs less than or equal to 40 MW or with rated speeds other than 1 500 r/min, 1 800 r/min, 3 000 r/min or 3 600 r/min (although generators seldom fall into this latter category) (see ISO 7919‑3 and ISO 10816‑3);
  • iv) gas turbines with outputs less than or equal to 40 MW or with rated speeds other than 1 500 r/min, 1 800 r/min, 3 000 r/min or 3 600 r/min (see ISO 7919‑3 or ISO 7919‑4 and ISO 10816‑3 or ISO 10816‑4);
  • v) the evaluation of combustion vibration but does not preclude monitoring of combustion vibration.
SDO ISO: International Organization for Standardization
Document Number ISO 20816
Publication Date July 1, 2017
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 108/SC 2
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