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mechanical stress analysis of pipes, vessels, structures and other mechanical components. The company was selected by a client to discover where and why extensive vibrations were coming from a high pressure (HP) mud system on a Norwegian oil rig, that was being manufactured in a shipyard in China.","paragraph",{"data":253,"content":254,"nodeType":251},{},[255],{"data":256,"marks":257,"value":258,"nodeType":242},{},[],"Stressman Engineering needed a solution that would enable them to execute advanced analysis while adhering to industry standards to ensure safety, compliance and fitness for service.",{"data":260,"content":261,"nodeType":251},{},[262],{"data":263,"marks":264,"value":265,"nodeType":242},{},[],"The goal of the multidiscipline project was to find the source of the vibrations and to carry out extensive pipe analysis to pinpoint the problem area. Resolving this would reduce stress and long-term damage to the client’s piping system. This case study focuses on the initial problem of the excessive vibrations.",{"data":267,"content":268,"nodeType":243},{},[269],{"data":270,"marks":271,"value":272,"nodeType":242},{},[],"Overcoming challenges",{"data":274,"content":275,"nodeType":251},{},[276],{"data":277,"marks":278,"value":279,"nodeType":242},{},[],"With the source of the pipe vibrations unknown in the HP mud system, Stressman Engineering was selected to find the exact location and why they were occurring. The client’s shipyard had previously carried out analysis with Octave Aspect Pipe Stress to find the source, but had no success in doing so. This was due to extensive shaking by the heavy mud pumps, in addition to the system vibrating in different areas, making it hard to distinguish the exact problem. Using the shipyard’s initial Aspect Pipe Stress analysis and reports, Stressman could transfer the files into their own Aspect Pipe Stress application seamlessly and begin modeling, comparing, updating and carrying out further analysis swiftly in that area. application seamlessly and begin modeling, comparing, updating and carrying out further analysis swiftly in that area.",{"data":281,"content":282,"nodeType":251},{},[283],{"data":284,"marks":285,"value":286,"nodeType":242},{},[],"The engineers at Stressman Engineering had decades of extensive experience with Aspect Pipe Stress solution. ",{"data":288,"content":289,"nodeType":243},{},[290],{"data":291,"marks":292,"value":293,"nodeType":242},{},[],"Realizing results",{"data":295,"content":296,"nodeType":251},{},[297],{"data":298,"marks":299,"value":300,"nodeType":242},{},[],"The starting point of the project involved modeling the existing files again according to the system drawings via Aspect Pipe Stress, to ensure an accurate analysis. From there, the Aspect Pipe Stress piping files were exported for computational fluid dynamics (CFD) evaluation. The BOSpulse application from DYNAFLOW, a third-party application, enabled further analysis working with Aspect Pipe Stress to carry out the fluid pulsation investigation. The pulsation analysis data was then pulled from BOSpulse and imported quickly and accurately back into Aspect Pipe Stress, to run the harmonic analysis. The harmonic analysis gave Stressman a clear visibility of how the piping system was responding to the pulsations.",{"data":302,"content":303,"nodeType":251},{},[304],{"data":305,"marks":306,"value":307,"nodeType":242},{},[],"Initially, the vibrations could not be seen in the analysis data where they were expected to be seen, when compared to the location of the vibration in real life.",{"data":309,"content":310,"nodeType":251},{},[311],{"data":312,"marks":313,"value":314,"nodeType":242},{},[],"Therefore, it was decided that more in-depth analysis was required, taking into account all the pipe supports. This was done by modeling them in the SAP2000, powered by Computers and Structures INC, another third-party solution, which processed the stiffness of the pipe supports in the system. Once the analyses were re-run, it resulted in the natural frequency of the system going down.",{"data":316,"content":317,"nodeType":251},{},[318],{"data":319,"marks":320,"value":321,"nodeType":242},{},[],"However, the pipe vibrations were still not amplifying as much as they were in real life. Backward engineering was then viewed as the best way forward to methodically work through the client’s HP mud system to find the source of the problem. ",{"data":323,"content":324,"nodeType":251},{},[325],{"data":326,"marks":327,"value":328,"nodeType":242},{},[],"This would enable Stressman Engineering to see if, during installation, pipe support functions had been missed or incorrectly added to the structure, resulting in the vibrations exhibited. With a pinpointed area of where in the system the vibrations were coming from, it was then a clear process of working through the different supports and running and re-running of analysis.",{"data":330,"content":331,"nodeType":251},{},[332],{"data":333,"marks":334,"value":335,"nodeType":242},{},[],"Throughout this part of the project, efficiency was maintained due to the ability to smoothly transfer data and files between Aspect Pipe Stress and third-party applications, maintaining the accuracy of data and results. As the analysis was carried out, Stressman Engineering identified a key pipe support in the system. The analysis showed that when the pipe support in question was removed from the Aspect Pipe Stress analysis model, a high-level of vibrations similar to the current response the HP mud system was exhibiting occurred.",{"data":337,"content":338,"nodeType":251},{},[339],{"data":340,"marks":341,"value":342,"nodeType":242},{},[],"The next step was to discuss the drawings with the onsite implementation team. The drawings stated the pipe support was welded. Stressman Engineering believed that either the guide support had been missed in the assembly of the system, or it was acting as a rest support. The best way to find out if this was the case was for one of the team to physically climb to the top of the structure and photograph what could be seen. It could then be concluded from the photography that the pipe support had been installed but not welded to the support structure. This resulted in the pipe support acting as a rest support, sliding back and forth when the system was in use, causing extensive vibrations and not supporting the system, producing further vibrations. The support was then welded into place, and the vibrations stopped. ",{"data":344,"content":345,"nodeType":251},{},[346],{"data":347,"marks":348,"value":349,"nodeType":242},{},[],"It took approximately three months for Stressman Engineering to find the source of vibration. The team began the project onsite in China before going back to Norway to run and complete pipe analysis and modeling remotely. The consequences of not being able to find where and why the vibrations were occurring could have resulted in a fatigue fracture and loss of structural integrity, which is critical. The HP mud system is an integral part of the drilling process, controlling the well pressure. Failure of the main mud pipe can lead to accidents, rig downtime and financial loss.",{"data":351,"content":352,"nodeType":243},{},[353],{"data":354,"marks":355,"value":356,"nodeType":242},{},[],"Moving forward",{"data":358,"content":359,"nodeType":251},{},[360],{"data":361,"marks":362,"value":363,"nodeType":242},{},[],"Octave solutions were chosen because of their ease of use, accurate integration to third party analysis solutions and due to being specified by the client. Stressman Engineering was able to carry out detailed modeling and analysis of the client’s HP mud system to find the area vibration and stop it. In the long term, this has saved Stressman Engineerings’ client loss of structural integrity in the system, which could have led to rig downtime, compromised safety and substantial financial losses.",{"data":365,"content":366,"nodeType":251},{},[367],{"data":368,"marks":369,"value":370,"nodeType":242},{},[],"The most significant benefit has been the optimization of work processes throughout the project due to easy integration with other third-party solutions, increasing accuracy and visibility. Time efficiency was also maintained because no manual calculating of data was required.",{"data":372,"content":373,"nodeType":251},{},[374],{"data":375,"marks":376,"value":377,"nodeType":242},{},[],"Stressman Engineering will continue using Aspect Pipe Stress solution in its upcoming projects to ensure productivity and accuracy, with error-free analysis and 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