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.