Flexible pipes dissection
The flexible pipes are multilayer structures that are constantly being used in offshore O&G exploration, mainly in Brazilian production fields. The layers that these pipes are made of are designed and manufactured using different materials, since each layer has a specific function. When combined, the layers form an equipment capable of transport fluids under extreme pressure and temperature conditions, besides withstanding the stresses from its proper weight, sea currents and oilrig movements. The flexible pipes have a number of advantages that justify their use, such as transport in reels, time and ease of installation, good accommodation to the seabed, reusability, among others. However, they also present some disadvantages, the main one being its sensibility to several different failure mechanisms, which, in many cases, results in premature decommissioning of flexible pipes before the end of its designed life.
The dissection is an investigative process, generally applied in equipment that presented some mode of failure in an accelerated or unexpected manner. The dissection technique consists in collecting information that lead to evidences about the origin and the evolution process of the structural degradation that the equipment suffered due to a combined action of physical phenomena present during the operation. With these evidences, the product engineering can develop or apply techniques that, at least, delay the degradation process, minimizing the consumption of service life of the equipment.
We have an experienced and specialized team that is familiar with the structural behavior and main failure modes that can be developed. This expertise enables Símeros to offer to the market flexible pipe dissection services, being the samples removed from operation or post experimental tests.
After several dissections have been carried out, we developed appropriated procedures and devices that support and organize all the dissection process, which usually involves mapping of the sample to be dissected, geometric survey of the pipe and its layers, section cuts, identification and registration of anomalies or failures found, and in the end, withdrawal and storage of samples. In the end of process, Símeros emits a dissection map, where is possible, through the referenced photographic record, identify each step, location and evidence found.