The amazing uses of nylon 11 powder for pipe coatings
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As the title suggests, the main material used in Rilsan coatings is PA11 powder, which is derived from castor oil and belongs to the aliphatic polyamide category. It possesses the following properties: First, it offers good resistance to friction and impact from sand and stones; it can be applied to pipes containing sediment, and it is widely used on the surfaces of sludge removal rollers in sewage treatment. Its performance is superior to that of epoxy and polyester coatings as well as polyolefin coatings. Second, it has decent corrosion resistance, enabling it to withstand concentrated saline solutions, concentrated ammonia solutions, sodium acetate, seawater, saturated calcium chloride solutions, and propane. (Solving the anti-corrosion issue inside pipes) III. Salt spray resistance: Testing using these two standards (ISO 7253, EN 10310) yields values of less than 3,200; corrosion is less than 1 mm after 20,000 hours of testing. (Solving the issue of external corrosion protection for pipes) IV. An economic perspective: Using the combination of \"carbon steel + Rilsan\" as a substitute for \"stainless steel 316L/304L\" can save 10 yuan per kilogram, based on current market prices. V. Case studies (those who are interested can send me a private message). I’m unable to upload a sample image; it’s quite awkward.
There are a few questions; I hope the original poster can answer them: 1. Can the spraying pipe only be connected using flanges? Can’t weld it? 2. If welding is necessary, will it affect the coating? Can it be repainted on-site? 3. What are the upper and lower limits for temperature and pressure resistance? 4. How long can the coating last? For example, what is the service life of the outer coating under sunlight? 5. Are there any cases of working on clean pipelines?
1. It is recommended to apply the coating after the pipes have been prefabricated, as this material deteriorates at high temperatures; its suitable operating temperature range is 80 degrees to 90 degrees Celsius. 2. Coating can be applied on-site, but relevant spraying equipment is required. 3. The long-term operating temperature is 80–90 degrees, with peak temperatures reaching 120 degrees. An operating pressure of 60 kgf is no problem; a test pressure of 80 kgf has been successfully applied in previous cases. 4. To illustrate the service life of the coating, as an example, in 1990, the pipes, valves, and fittings in a reverse osmosis desalination plant in Okinawa Prefecture, Japan, which had a processing capacity of 40,000 m3 per day, are still in good condition to this day. External irradiation complies with the ASTM D 1235 standard established in Florida, USA; many materials used for automotive exterior components are also required to meet this standard. 5. It’s completely fine to use such materials for cleaning pipes; their low surface roughness combined with good antibacterial properties helps to reduce sources of contamination. They are widely used in Europe, but there are few examples of their use in China at present.