ShawCor has been granted a patent for a method of coating field joints in pipe sections. The method involves providing angular cut backs in the parent coating of each pipe section, resulting in a stepped profile. The field joint coating is then injection molded to have a maximum height of 5mm. GlobalData’s report on ShawCor gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on ShawCor, fiber-reinforced material joining techniques was a key innovation area identified from patents. ShawCor's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Method of coating a field joint with stepped profile
A recently granted patent (Publication Number: US11685090B2) describes a method for coating a field joint that joins two pipe sections. The method involves providing angular cut backs in the parent coating of each pipe section, resulting in a stepped profile. The first angular cut back is positioned closer to the field joint than the second angular cut back. The step in the stepped profile is defined between these two cut backs and is parallel to the longitudinal axis of the field joint. The thickness of the step is less than one third of the thickness of the parent coating.
The method also includes injection molding a field joint coating over the uncoated ends and the angular cut backs. The field joint coating is molded to have an upstand that is less than or equal to about 5 mm. The patent claims specify various angles and tolerances for the angular cut backs, with the preferred angle being about 30°±5°. The field joint coating is made of injection molded polypropylene, and the upstand is about 0 mm.
In addition to the coating process, the patent also mentions the use of a mold for positioning around the cut backs during injection molding, as well as pre-treating exposed surfaces of the field joint before applying the field joint coating.
The patent also includes a second set of claims that are similar to the first set, with some variations in the dimensions and angles. The second set of claims describes a method for coating a field joint with a stepped profile that is about 8 to about 20 mm from the outer surface of the parent coating.
Overall, this patent describes a method for coating field joints in pipe sections using angular cut backs and injection molding. The method aims to provide a stepped profile that enhances the durability and integrity of the coating. The use of specific angles, tolerances, and materials ensures consistent and reliable results.
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