{"id":2533,"date":"2026-05-29T19:41:09","date_gmt":"2026-05-29T19:41:09","guid":{"rendered":"https:\/\/petrostreet.com\/main\/?p=2533"},"modified":"2026-05-29T19:43:23","modified_gmt":"2026-05-29T19:43:23","slug":"primary-containment-inspection-test-results-outside-acceptable-limits","status":"publish","type":"post","link":"https:\/\/petrostreet.com\/main\/primary-containment-inspection-test-results-outside-acceptable-limits\/","title":{"rendered":"Primary Containment Inspection & Test Results Outside Acceptable Limits"},"content":{"rendered":"\n

One of the very important defined Tier-3 indicators as per API 754 is the primary containment inspection & test results outside acceptable limits. It is significant to properly understand this indicator, report, analyze, investigate, and improve to avoid escalation. By definition, it asks users to identify those cases where any primary containment has been found operated beyond acceptable limits asking for a replacement in kind, repair, rerate, derate, replace with other materials or support with enhanced inspection. Some of the cases come straight forwardly within this definition, and can easily be identified, reported, analyzed, investigated, and improved. However, there are other inspection findings which may not directly be reported and requires site interpretation, or development of specific guidelines. Not supporting with that may filter out all those inspection findings which could have been brought under process safety reporting umbrella providing necessary site management focus, follow-up, and application of learning to other such cases. This indicator provides asset owner with an opportunity that inspection & integrity are well versed with its reporting, and addressing the underlying issues before there is any process safety incident of any smaller or greater consequences.<\/p>\n\n\n\n

The easiest of the cases to pick and report under this indicator include those where damage is of an extent asking for replacement-in-kind, repair, rerate or derate straight away without returning the equipment to service. It is very important to note here that normally these cases are identified upon failure and already have resulted in LOPC. Therefore, once reported in LOPC, they would not be becoming a finding under the indicator we have been discussing. This means that primary containment inspection & test results outside acceptable limits indicator is a proactive one at least before the leak event. Damage might have been in advanced stage declaring the primary containment unfit to operate but loss of primary containment has still not occurred. Inspection & integrity personnel identifying any such findings should declare them to HSE or process safety personnel. Thinning is the main feature which might have happened and trigger the replacement, repair, rerate or derate. However, inspection findings do not get limited to thinning only as identification of an unacceptable crack, and temperature related damages also qualify to be reported. A furnace tube, boiler tube identified with a hot spot, identified material embrittlement all are the cases coming within the coverage of this indicator.<\/p>\n\n\n\n

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Now coming to the cases where significant damage has happened to the primary containment however the equipment has still been evaluated as fit to operate with no immediate replacement, repair, rerate or derate recommendations. Take the case where a corrosion rate has been identified which was not anticipated as in RBI assessments. Though that corrosion has not happened beyond minimum required thickness, Tmin of the pressure equipment however accelerated corrosion has been reported. In this case, the equipment has not yet been operated outside acceptable limits as that has been declared still, fit for service. By definition, the case does not fit to be reported however it is recommended that those potential cases must be picked up with a flag approaching to face operating conditions outside acceptable limits. On an official database, it is still not recommended that such cases are reported as Tier-3 process safety indicators. Inspection & integrity teams should make sure that remaining life assessment calculations must be done for all such cases with a timeline for next inspection, replacement, repair, rerating or derating.<\/p>\n\n\n\n

Another classic case is of a pressure safety valve, failing a bench test and found stuck or popping beyond 120%. That should also be reported as a primary containment inspection & test result outside acceptable limits as PSV might have not been functioning as intended upon demand leading to a process safety event of concerning consequences. Similarly, within the inspection program, an unexpected CUI result should also be declared as a case of primary containment inspection & test results outside acceptable limits.<\/p>\n\n\n\n

While this indicator is being considered, it is good to connect this with Integrity Operating Windows (IOWs) as we do not find IOWs excursions anywhere within API 754 indicators. Integrity operating windows when defined clearly, and found to be excursed should be reported as a flag case like we discussed in the paragraph below no matter that excursion has actually resulted in a damage or not. Safe operating limits connected to basic process control system are entirely different than IOWs. Chemical composition of the input feed may not be concerning for process control system but that composition can trigger corrosion. Take the case of free water in hydrocarbon service, and how that can critically impact the mechanical integrity of the primary containment through corrosion. These are the conditions which can adversely affect the already defined or assumed corrosion rates of all feeds during RBI assessment studies. Therefore, an increase in corrosion rate could be connected with defined IOWs. Cases where IOWs are not defined, it is recommended that RBI program should have validation checks as well to make sure that nothing goes wrong within the inspection interval when the inspection is not made.<\/p>\n\n\n\n

Once identified, what exactly is required to be done with all cases of primary containment inspection & test results outside acceptable limits? This becomes important and it requires probing through an investigation process. Every such case should be declared as pressure equipment integrity incident or a near miss. It is strongly recommended to apply API 585 here. Based upon the criticality of the incident or near miss, a formal investigation team can be developed focusing on identifying the root causes, contributing causes, immediate actions, and the long-term action addressing the learnings to be applied. Recommendations should be generated in a way that they should address the systemic causes, addressing the integrity program in place enabling personnel to clearly understand which barrier failed, and how can that be fixed with no failures in future. Many of the primary containment related findings point towards operating conditions and sites lacking IOWs program are vulnerable to have findings which were not anticipated by inspection & integrity personnel. Application of this indicator should be on safety critical equipment operating flammable, toxic or hazardous fluids as other utility processes may get exempted to ensure the focus is on the right set of primary containment when reporting this indicator.<\/p>\n\n\n\n

Process safety & mechanical integrity of hydrocarbon processing industries highly depend on the inspection & test results from intensive inspection & integrity program in place. These results when indicate that the equipment has been operated outside acceptable limits should be identified, reported, analyzed, investigated, actions, and learned from. Failing to do so at an early stage may lead to loss of primary containment cases with concerning consequences in terms of HSE, financial, and reputation.<\/p>\n","protected":false},"excerpt":{"rendered":"

One of the very important defined Tier-3 indicators as per API 754 is the primary containment inspection & test results […]<\/p>\n","protected":false},"author":1,"featured_media":2538,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","_ppp_document_settings_meta":"{\"product_ids\":[{\"label\":\"Primary Containment Inspection & Test Results Outside Acceptable Limits - 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