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Overspeed

Safety integrity levels for overspeed detection system (ODS)

During normal operation, a turbine’s own speed control system regulates the rotational speed of the machine. However, in the event of a problem with the turbine and/or its control system, an overspeed detection system (ODS) provides an isolated layer of protection that will automatically and immediately initiate a shutdown of the machine should this become […]

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Six benefits of using a scalable overspeed protection system

Overspeed protection systems (ODSs) play a key role in ensuring the safe operation of power plants and their machinery. In the past, ODSs were predominantly mechanical devices but nowadays, most overspeed systems are electronic in nature.   While an ODS can be integrated in the control system of a machine, it is strongly recommended that […]

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Long proof test intervals for SIL overspeed detection systems

Proof testing is a routine action that helps ensure the integrity (SIL level) of a safety instrumented system (SIS) throughout its lifecycle. Long proof test intervals are preferable to short proof test intervals because they reduce unnecessary downtime, especially if the proof testing can be aligned with a machine’s periodic maintenance procedures.   Proof test […]

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Maintenance and proof test requirements for SIL overspeed detection systems

Because the integrity of a safety-related system degrades over time, periodic testing (known as proof testing) is essential in order to detect hidden failures. So it is of crucial importance that all safety instrumented systems (SISs) have a maintenance plan in place to support their ongoing operation. This compensates for the safety system integrity degrading […]

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Proximity measurement systems as speed sensors

When it comes to the design and specification of an overspeed detection system (ODS), the selection of the correct speed sensors for each specific application is essential in order to achieve an accurate and reliable measurement of the rotational speed and/or acceleration. In every ODS application, particular attention has to be given both to the […]

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Key aspects to consider when selecting an overspeed detection system

According to the API standard 670 for Machinery Protection Systems, an electronic overspeed detection system (ODS) consists of speed sensors, power supplies, output relays, signal processing, and alarm/shutdown/integrity logic. Its function is to continuously measure shaft rotational speed and activate its output relays when an overspeed condition is detected.   API 670 defines multiple requirements […]

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Overspeed detection system should always be an isolated layer of protection

An Overspeed Detection System (ODS) has one job and one job only – detect an overspeed event and initiate an emergency trip sequence.

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