Method for coating a pipeline field joint
A coating and pipeline technology, applied in the direction of pipes/pipe joints/fittings, pipeline protection, pipeline anti-corrosion/rust protection, etc., can solve the problems of corrosion of pipe fittings, different chemical properties, low maximum bonding strength and maximum bonding strength.
Inactive Publication Date: 2020-03-06
DOW GLOBAL TECH LLC
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Problems solved by technology
However, due to the different chemical properties of the new field joint coating and the PP pipe fitting coating, the maximum bond strength achievable between them and polypropylene with conventional adhesive layers and / or primers is lower than that of polypropylene / polypropylene or Maximum achievable bond strength between polyurethane / polypropylene
Therefore, there is a perceived risk that cracks can develop between the fitting and the new non-PP field joint coating, which is undesirable as it allows water to penetrate the fitting coating, causing corrosion of the fitting
Method used
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Examples
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example 1
[0162] Example 1 is VERSIFY 4200, Example 2 is MHA-g-VERSIFY 4200, and Example 3 is INTUNE 5545. Examples 4 to 6 are 5% by weight primer solutions of Examples 1 to 3, respectively, in methylcyclohexane (MCH).
[0163] For the comparative examples, a 2 to 3 mm thick layer of GSPP was used without a primer solution. For the examples of the invention, a 2 to 3 mm thick layer of GSPP was coated with the primer solution and allowed to dry completely. A 2 to 3 mm layer of X-Linked PE was placed on top of the uncoated and primer-coated GSPP substrates, heated to 190°C for 2 minutes, and pressed together in a compression press at 6,000 psi for 4 minutes, then 4 minutes at 10,000psi, then 2 minutes at 15,000psi. The temperature was lowered to 25°C and the press was held at 6,000 psi for 4 minutes, then 10,000 psi for 4 minutes, then 15,000 psi for 2 minutes. Comparative Example A is a control and has X-linked PE molded to GSPP without primer. Examples 7 to 9 are molded substrates u...
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Abstract
The present invention relates to a method of coating a pipeline field joint comprising the steps of (1) applying a layer of a first coating material comprising a substantially linear ethylene polymer,a linear ethylene polymer, or an olefin block copolymer to the uncoated region of the field joint and (2) subsequently applying a layer of a second coating material comprising a polyurethane, an epoxy, or a cross linked polyethylene to the field joint.
Description
technical field [0001] The present invention relates to improvements in coating pipe fittings, and more particularly to a method for coating a pipe field joint and a coated pipe field joint. Background technique [0002] Pipelines used in the oil and gas industry are typically formed from lengths of steel pipe that are welded together end-to-end when the pipeline is laid. The pipe rods are also usually fabricated at the onshore spool base and the prefabricated pipe elements are transported offshore for laying, for example in a drum lay operation where the pipe rods are welded together and stored in compact coiled form at the pipelay on board. [0003] In order to mitigate corrosion of the pipes and optionally also insulate the fluid carried by the pipes in use, the pipe fittings are pre-coated with a protective coating, which is also optionally thermally insulating. The structure and composition of the coating can vary in many ways to obtain the desired protective or insul...
Claims
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IPC IPC(8): B29C63/18
CPCB29C63/18B29C63/0073B29L2023/22C09D5/002C09D123/12C09D123/16C09D123/26C09D153/00C09D163/00C09D175/08C09D183/10F16L58/18
Inventor R·M·梅塔M·W·布朗二世A·M·古德曼B·库马万启春
Owner DOW GLOBAL TECH LLC