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
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
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 23
- Дата публикации:
- 27 июля 2017 г.
- Издание:
- ISO IS 20816 edition 1 version 1
- ICS:
- 17.160
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 this document can be applied to the vibration of the gas turbine, steam turbine and generator and other shaftline components (such as synchronizing clutches, exciters or flywheel masses). 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 20816-3); 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 20816-3 or ISO 20816-4); v) the evaluation of combustion vibration but does not preclude monitoring of combustion vibration.
Abstract
Overview
ISO 20816-2:2017 - Mechanical vibration - Measurement and evaluation of machine vibration - Part 2 - provides practical, in-situ guidance and severity criteria for broad‑band vibration of large land‑based gas turbines, steam turbines and generators. It applies to machines with fluid‑film bearings, rated speeds of 1 500, 1 800, 3 000 or 3 600 r/min, and power outputs greater than 40 MW. The standard covers vibration measured on main bearing housings (radial), thrust bearing housings (axial) and rotating shafts near main bearings under steady‑state and transient operating conditions.
Key topics and technical requirements
- Scope and exclusions
- Applies to land‑based gas/steam turbines and coupled generators >40 MW with specified rated speeds.
- Excludes aero‑derivative turbines, electromagnetic twice‑line‑frequency generator vibration, and machines outside the speed/power ranges; combustion vibration is not evaluated (but may be monitored).
- Measurement procedures
- Broad‑band vibration measurement (recommended frequency range: 10 Hz to at least 500 Hz for non‑rotating parts).
- Guidance on transducer selection, mounting and orientation (typically two orthogonal radial transducers per main bearing housing).
- Consideration of environmental influences (temperature, electromagnetic fields, cable effects, structure‑borne noise).
- Evaluation criteria
- Two primary criteria for steady‑state operation:
- Criterion I - Vibration magnitude: assesses absolute vibration level at rated speed.
- Criterion II - Change in vibration: assesses changes in vibration magnitude over time.
- Additional guidance for transient conditions (run up/down, load changes) and use of vector information.
- Normative annexes provide evaluation zone boundaries for non‑rotating parts and rotating shafts, plus guidance for alarm/trip setting and low‑speed velocity issues.
- Two primary criteria for steady‑state operation:
Practical applications
- Establishing acceptance checks and routine vibration limits during commissioning of large turbines and generators.
- Defining alarm and trip thresholds for condition monitoring systems.
- Performing site vibration surveys, periodic vibration assessments and trend analysis to detect deterioration or developing faults.
- Supporting maintenance decision‑making (repair, balancing, alignment) and validating installation quality.
Who uses this standard
- Power plant operators and maintenance teams
- Condition monitoring and vibration analysts
- Turbine and generator OEMs and suppliers
- Commissioning engineers and technical consultants
- Reliability and asset management professionals
Related standards
- ISO 20816-1:2016 - general guidelines for measurement and evaluation of machine vibration (normative reference).
- See also parts ISO 20816-3 and ISO 20816-4 for turbines/generators outside the power/speed ranges and for other machine types.
Keywords: ISO 20816-2, mechanical vibration, turbine vibration measurement, generator vibration, fluid‑film bearings, vibration criteria, vibration monitoring, broad‑band vibration.
Технические детали
- Технический комитет
- ISO/TC 108/SC 2 - Measurement and evaluation of mechanical vibration and shock as applied to machines, vehicles and structures
- SKU
- ISO 20816-2:2017
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