Valve Test Frequency Service

Analysis of valve signature data to estimate valve failure rates and optimize test intervals

Have you wondered if your valve testing frequency is helping you have more confidence in your valve reliability, or if it is increasing wear out of your valve? Have you struggled to know just how often you should test your valves to have most confidence in their reliability through life to operate on demand, for example to isolate a hazardous leak?

It is often difficult to know accurately, the condition of a valve and how reliable it is for future operations, especially if it is located in an inaccessible location, such a remote processing plant or subsea.  Knowing the condition and reliability of the valve(s) is however of critical importance, both in terms of assuring the continued safety isolation capability of the installation and its availability for production.  If valve signatures are measured during tests and other actuations, even without inspection, it is possible to determine valve status (new, degraded or failed) at each actuation by comparing pressure, time and volume measurements over time. 

Astrimar provide a service to analyse the data gathered through valve signature readings over time and perform statistical analysis to determine the probability of the valve being in each state and the associated state transition rates. Astrimar then make a comparison between the predicted probability of failure and the maximum allowable failure risk, in order to estimate the maximum time before the next test.

Purchase our Valve Test Frequency Optimization service through:

Astrimar’s valve test optimization service is also able to interface with and use the results generated in the Intelligent Plant Valve Signature Tool, also available on the Industrial Appstore.  Astrimar can also support the use of the Valve Signature Tool, through definition of baseline signatures and uncertainty analysis for both the signature data and acceptance criteria.

Astrimar are able to provide further services beyond the single valve test optimization.  For example, analysis of multiple valves utilized within a system, to determine the overall failure risk (and hence optimum test and maintenance strategies) for the system of valves, where multiple valves are required / available to provide a single function (e.g. isolation).  Additional services available also include common cause failure analysis (CCFA) to assess the vulnerability of a system of valves to a simultaneous or near-simultaneous failure cause, and root cause failure analysis (RCFA) to determine ultimate causes of failure, to enable effective improvements and corrective actions to be put in place to limit the probability of subsequent failures of the same or other valves.  Our services align to the best practices defined in API RP 17N. Please contact us for more information on these additional services.

Make better use of the data you already have, to efficiently manage the reliability and availability of your critical process and safety valves.