Maintenance & Repair
Final thoughts
There is the risk of finding trouble while working on any of milestones listed previously . Once the valve is removed , inspection might reveal unacceptable corrosion damage under thermal insulation ; or piping flanges might have a misalignment in excess of what is prescribed in the design code . The MP ( or its representative ) must know the company ’ s structure and be able to summon the required specialists to address the situation and give guidance on how to proceed .
Figure 3 : GV-001A valve . Source : https :// www . americanheatingco . com / heat-exchangers / shell-and-tubeexchangers /.
insert it in the resources report , along with the correspondent isometric drawing ( also highlighting which valve must be replaced ). Proper identification is vital to avoid misunderstandings and the very real possibility of replacing the wrong valve . The field planner has also to list resources ( equipment and manpower ) and estimate task duration . Considering that a 6 ” # 150 flanged gate valve weighs roughly 90kg ( 198lbs ), a crane or some type of lifting device will be necessary . There is also some thermal insulation that will require reinstallation . A typical list will likely have the milestones highlighted in Figure 3 .
This is not an exhaustive list , of course . Many more details can be added , such as logistics challenges or prior removal of equipment , and structure or piping needed in order to be able to move the valve in and out of the specific location . All of the milestones above can also be further divided in sub-milestones . For example , ‘ new valve installation ’ can become ‘ create rigging and lifting procedure ’, ‘ train field technicians on the specific instructions for that particular model ’ and ‘ install new valve .’
About the author Davi Correia is a Senior Mechanical Engineer who has worked at a major Brazil-based oil company for the last 15 years . Correia is part of multi-disciplinary team that provides technical support for topside piping and equipment of production platforms . During this period , he began to work with materials and corrosion , and later moved to piping and accessories technology , where he has become one of the lead technical advisors on valve issues . Correia was part of the task force that revised the IOGP S-562 standard , and wrote the S-611 standard . Correia has a master ’ s and a doctor ’ s degree in welding by the Universidade Federal de Uberlandia .
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