Pipework and vessel wall thickness inspection
Corrosion is a rate and the next inspection date should come from it. A fixed interval is either too soon for most lines or too late for the one that matters.
What does a pipework and vessel wall thickness inspection involve?
Pipework and vessel wall thickness inspection checks: wall thickness at marked points (mm), corrosion rate (mm per year), probe reading. Observed by ultrasonic thickness gauge at marked points; permanently installed thickness sensors or corrosion probes on critical lines. The measurement converts to a rate-based interval; where the pipework is part of a registered pressure system the written scheme still sets a maximum interval.
- Condition that replaces the interval
- Wall thickness approaching the minimum allowable by the corrosion rate calculated from the last two readings, or a corrosion probe showing the rate rising
- Reading that proves it
- Wall thickness at marked points (mm), corrosion rate (mm per year), probe reading
- Why the interval stays
- The measurement converts to a rate-based interval; where the pipework is part of a registered pressure system the written scheme still sets a maximum interval.
- Evidence an auditor accepts
- Thickness record per point with the minimum allowable, the rate and the next inspection date derived from the rate
- First move
- Mark and photograph every measurement point; a reading from a slightly different spot is a different number.
What it is evidence for
Clause references from the published standards text. A clause marked reference is named, not reproduced.
Calendar tasks a monitored condition could replace ISO 55001:2014 9.1 · ISO 55001:2014 8.1 · ISO 55001:2014 6.2.2 · ISO 55001:2014 8.2 · ISO 55001:2014 10.3 · ISO 45001:2018 8.1.3
ISO 55001:2014 9.1 Monitoring, measurement, analysis and evaluationThe organization decides what is to be monitored and measured, which methods of monitoring, measurement, analysis and evaluation will give valid results, when monitoring and measuring take place, and when results are analysed and evaluated. It assesses and reports on how the assets perform, on how asset management perf...
ISO 55001:2014 8.1 Operational planning and controlThe organization plans, carries out and controls the processes needed to satisfy requirements and to deliver three things: the asset management plans set out under 6.2, the actions on risks and opportunities decided under 6.1, and the preventive and corrective actions decided under clauses 10.1 and 10.2. It does so by ...
ISO 55001:2014 6.2.2 Planning to achieve asset management objectivesThe organization joins up its planning for asset management objectives with the rest of its planning, including finance, human resources and other support functions. It sets up, documents and maintains asset management plans that state the method and criteria for making decisions, the processes and methods for managing...
ISO 55001:2014 8.2 Management of changeBefore any planned change is made, whether temporary or permanent, that could affect whether the asset management objectives are met, its risks are assessed, and the organization makes sure those risks are handled as 6.1 and 6.2.2 require. It controls changes it has planned and reviews the consequences of changes that ...
ISO 55001:2014 10.3 Continual improvementThe organization keeps making both its asset management and its system for it more suitable, more adequate and more effective.
ISO 45001:2018 8.1.3 Management of changeThe organization sets up processes to put in place, and keep under control, planned changes, temporary or permanent, that affect OH&S performance. These include: new products, services and processes, or alterations to existing ones (such as where workplaces are and what surrounds them, how work is organized, working co...
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Paste your maintenance schedule or log and get this classification for every line at once, with the findings, the overdue items and the clauses the register is evidence for. First 15 items free, no account.
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