Standard NBN ISO 20816-2:2021

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 (ISO 20816-2:2017)
Status
:
Active
Publication date
:
6/2021
Languages
:
EN/FR
ICS
:
17.160 Vibrations, shock and vibration measurements 27.040 Gas and steam turbines. Steam engines 29.160.40 Generating sets
Summary :
This document is applicable to land-based gas turbines, steam turbines and generators (whether coupled with gas and/or steam turbine
s) 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 this document can be applied to the vibration of the gas turbine, steam turbine and generator (including synchronizing clutche
s). This document 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. transvers
e) to the shaft axis;
b) structural vibration at thrust bearing housings measured in the axial direction;
c) vibration of rotating shafts radial (i.e. transvers
e) 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-stat
e) 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. This document is not applicable to the following:
i) electromagnetic excited vibration with twice line frequency at the generator stator windings, core and housing; i
i) aero-derivative gas turbines (including gas turbines with dynamic properties similar to those of aero-derivative
s); 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. ii
i) 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 categor
y) (see ISO 7919-3 and ISO 10816-3); i
v) 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. INTERNATIONAL STANDARD ISO 20816-2:2017(E) © ISO 2017 – All rights reserved 1 ISO 20816-2:2017(E)
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