Important steps for cleaning coated composite pipes
Release time:
2020-12-10
During the maintenance of coated composite pipes, there is a cleaning and washing step. Therefore, the cleaning step is extremely important. So how can we ensure that it’s carried out effectively? Below, the manufacturer of coated composite pipes provides some detailed insights on this topic—hopefully, you’ll find these tips helpful.
Plastic-coated composite pipe During maintenance, there’s a step involving cleaning and washing, so the cleaning step is also extremely important. So how can we ensure that this step is carried out effectively? Below, the manufacturer of coated composite pipes provides some detailed insights on these aspects—hopefully, you’ll find them helpful.
Plastic-coated composite pipe The cleaning process uses solvents and emulsions to clean the surface of steel, thereby removing oil, grease, dust, lubricants, and similar organic contaminants. However, it cannot remove rust, oxide scale, welding flux, or other similar substances from the steel surface; therefore, in corrosion-resistant production, it serves only as a supplementary step.
Rust Removal: Using tools such as wire brushes to grind the surface of steel can remove loose or flaking oxide scale, rust, welding slag, and other contaminants. Manual tools can achieve a Sa2 grade of surface preparation, while power tools can reach a Sa3 grade. However, if the steel surface is covered with firmly adhered iron oxide scale, the rust removal results may be unsatisfactory and fail to meet the required anchor profile depth for corrosion protection work.
Pickling: Both chemical and electrolytic methods are commonly used for pickling treatment; however, for pipeline corrosion protection, only chemical pickling is employed. Pickling can remove scale, rust, and old coatings. Sometimes, it can also serve as a post-treatment following sandblasting for rust removal. Although chemical cleaning can achieve a certain level of cleanliness and surface roughness, the resulting anchor profile is shallow, and the process is prone to causing contamination.
Shot (or blast) rust removal: Shot (or blast) rust removal involves using a high-power motor to drive rotating blades at high speed, causing abrasive materials such as steel grit, steel shots, wire segments, and minerals to be propelled onto the surface of both inner and outer coated pipes under the influence of centrifugal force. This shot (or blast) rust removal method not only thoroughly removes rust, oxides, and contaminants but also achieves the desired uniform roughness on the inner and outer coated pipes due to the intense impact and friction exerted by the abrasive materials.
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