Rotor balancing is a procedure by which the mass distribution of a rotor is checked and, as necessary, adjusted to ensure the unbalance tolerance is met. BS ISO 21940-11:2016+A1:2022 establishes procedures and unbalance tolerances for balancing rotors with rigid behaviour, providing guidance on the magnitude of the permissible residual unbalance for a range of machine types.
BS ISO 21940-11 applies in a wide range of rotating machine design, construction and operation industries and is written for engineers and balance machine operators in balancing test facilities.
It establishes procedures and unbalance tolerances for balancing rotors with rigid behaviour. It specifies:
NOTE: In BS ISO 21940‑14, the assessment of balancing errors is considered in detail. Fundamentals of rotor balancing are contained in BS ISO 21940‑1, which introduces balancing.
BS ISO 21940-11:2016+A1:2022 does not cover the balancing of rotors with flexible behaviour. Procedures and tolerances for rotors with flexible behaviour are dealt with in BS ISO 21940‑12.
It provides a practical balancing approach that can minimize the costs and time of the balancing process
The standard is well established, recognized and accepted by the industry
It can help users access new markets
It can help users develop their expertise and improve their efficiency
It can help users increase confidence in products and manage risk
BS ISO 21940-11 contributes to UN Sustainable Development Goal 9 on industry, innovation and infrastructure.
This is an amendment to BS ISO 21940-11:2016. The major change in BS ISO 21940-11:2016+A1:2022 is the addition of a new annex that has a table of suggested information that could be added to a rotor’s design drawing. This gives the necessary details for balancing of rotors with rigid behaviour, which are frequently not supplied, leading to ambiguity or even incorrect balancing tolerances.
ISO 21940-11:2016/Amd 1