Definitions

The Hazard and Operability Study (HAZOP) is a qualitative hazard evaluation method used to identify the consequences of all potential risk scenarios.

The HFT is calculated based on the architecture of a system. For example: an architecture with two valves with exactly the same function (1oo2) has an HFT of 1; when one of the valves fails, the other takes over the function. Although Hardware Fault Tolerance (HFT) resembles redundancy, it is not exactly the same. Consider, …

Functional Safety is a part of the overall safety of a system. Its purpose is to identify potential dangerous situations or events that could lead to accidents with consequences for people, the environment, and finances.

The enabling condition is directly related to the initiating event. It is the effect of the cause (initiating event) that enables the dangerous situation. For example: corrosion in a pipeline (initiating event) can lead to a gas leak (enabling condition), which can then lead to a gas explosion; the dangerous situation.

Dynamic imbalance is a combination of static and couple imbalance, which is most commonly encountered in practice.

A displacement sensor is used for low frequency vibration measurements.

In couple imbalance, two equal weights are positioned opposite each other so that the rotor is balanced in the resting position. However, when the rotor moves, these weights will move in opposite directions, causing the ends of the shaft to vibrate in opposite directions.

Condition monitoring is the monitoring of rotating machinery during active process conditions by measuring vibrations. Significant changes in vibration behavior indicate developing faults. Based on the vibration trends, necessary maintenance can be planned.

In an angular alignment error, the axes are aligned at an angle.

In aperiodic vibration, the movements are not repeated over time. As a result, no vibration trend can be established, and it is not possible to identify the necessary maintenance based on this type of vibration.