FITNESS FOR SERVICE ASSESSMENTS (FFSAs) R-R-R-R DECISIONS We see lots of FFSAs during our training and consultancy activities at WILKINSON COUTTS. With the best of intentions, things sometimes get more complicated than they need to be. Let’s simplify things…. There are only possible output decisions of a FFSA, as shown in table 1 below; Run (as-is) Re-rate Repair Replace …
HF Damage Mechanisms – the threat to your assets. The US Chemical Safety and Hazard Investigation Board have issued the final report on a significant fire and related explosions that occurred in June 2019 at the Philadelphia Energy Solutions (PES) Refinery in Philadelphia, Pennsylvania (CSB). The cause of the accident, which shut down a refinery that could produce …
HTHA – A serious threat to pressure equipment integrity. Covered extensively in our API 571 Training Course, we’re often asked about HTHA. When carbon steel is used to manufacture pressure equipment for hydrogen-containing (gaseous or liquid, even when it is a constituent portion of a fluid) service, the service conditions should be limited to avoid High-Temperature Hydrogen Attack (HTHA). …
Fitness For Service – Local Metal Loss Level 1 Assessment. Part 3 of our 3 part series takes a look at the assessment of local metal loss. As we discussed in Part 1, there is strictly no definition of what constitutes local metal loss compared to general, so the accepted rule of thumb is to start with a Part 4 …
Fitness For Service General Metal Loss One of the most common damage classes (modes) found in static mechanical plant is metal loss. It can be caused by a number of damage mechanisms such as; -Atmospheric corrosion -Erosion -Sulphidation -Corrosion Under Insulation (CUI) -Microbiological Induced Corrosion (MIC) -Under Deposit Corrosion(UDC) -CO2 corrosion There are many more, and these can …
What are the PSSRs and what do they cover? The Pressure Systems Safety Regulations 2000 (PSSR) cover the safe design and use of pressure systems with the aim to prevent serious injury from the hazard of stored energy (pressure) as a result of the failure of a pressure system or one of its component parts. The regulations are …
This article ‘Back to basics – Material Properties’ covers the essential properties when considering asset integrity. Material science in itself is a huge subject, with endless reference books and academic courses that cover the subject. Only a high-level understanding will be provided in this article. Stakeholders should be concerned with ensuring pressure equipment is safe to operate and the …
Pressure Relief Valves – Pressure equipment requires protection from over pressurisation. A common way to protect vessels is the installation of a pressure relief valve. A pressure relief device is actuated by inlet static pressure and designed to open during an emergency or abnormal conditions to prevent a rise of internal fluid pressure above the specified design value. This device …
Calculating Branch Connections: ASME B31.3 Para. 304.3.2 – Whenever a branch is added to the main pipe run (header) an opening is created by the removal of a predetermined amount of metal. We use Branch Connections: ASME B31.3 Para. 304.3.2 to consider the design. The header pipe is weakened as the metal removed is no longer there to resist the …
What is fitness for service? Fitness For Service (FFS) assessments are a set of methods that use quantitative data to determine if a degraded component is fit for continued service at the current operating parameters and to establish the useful remaining life of the component. Some case examples are found in this research paper. It is an analysis that …
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