Next, let’s talk about selection. Hot-dip coated steel pipe What should I pay attention to?

　　What factors should be considered when selecting hot-dip galvanized steel pipes with plastic coating?

　　The transportation of petroleum, natural gas, and other liquids has long been a significant concern, as these substances pose substantial risks during transit. A leak can result in severe losses and even endanger human life. Therefore, it is essential to ensure the quality of plastic‑coated steel pipes. So, what should you consider when selecting hot‑dip plastic‑coated steel pipes? First, pay attention to wall thickness: the pipe diameter should exceed 0.02 inches. Only under such conditions can the pipe withstand high pressure and remain intact even when subjected to tensile forces.

　　Secondly, check whether the surface is smooth. Inferior plastic‑coated steel pipes often have an uneven surface, and some may even exhibit tiny cracks; their finish lacks luster. In addition, measure the pipe diameter at several points to see if it remains consistent—high‑quality pipes should be uniform throughout. If variations are noticeable, the product is substandard. When selecting, opt for products from reputable manufacturers, as they typically use rigorous packaging; loose or irregular packaging is a red flag.

　　Connection methods for hot-dip coated steel pipes

　　During pipeline installation, the addition of water is strictly prohibited, as exposure to moisture accelerates the corrosion of steel pipes, posing significant risks. Therefore, during acceptance testing, pipe sections must remain free from contact with water; non‑plastic‑coated fittings must not be substituted for plastic‑coated ones, and plastic‑coated fittings are not permitted in malleable cast‑iron pipe assemblies. Necked, raised‑face threaded steel flanges should be equipped with injection‑molded ports. Hot‑dip galvanized steel pipes with plastic coatings, when connected to valve outlets, represent a highly versatile piping material whose performance characteristics can be daunting to many manufacturers. Let us begin by examining its plastic‑coated fittings to clearly understand its connection methods.

　　First, during pipeline installation, adding water is strictly prohibited, as exposure to moisture accelerates the corrosion of steel pipes, posing significant damage. Therefore, during acceptance, pipe sections must remain free from contact with water; non‑plastic‑coated fittings must not be substituted for plastic‑coated ones; and plastic‑coated fittings should not be used in malleable cast‑iron pipe assemblies. For raised‑face threaded steel flanges with a neck, an injection‑molded port must be provided. Valve‑port threads should be connected via transition fittings, water‑supply connections require dedicated transition components, and grooved connections necessitate specially designed rubber sealing rings. Once a transition plan has been established, we should proceed with using its proprietary materials to ensure superior joint integrity. This process is critical yet prone to errors; therefore, when preparing the assembled… Hot-dip coated steel pipe When inserting the pipe into the heating furnace for heat treatment, both time and temperature must be carefully controlled. Moreover, plastic‑lined composite steel pipes exhibit stable performance, with the steel pipe and its inner and outer plastic coatings tightly bonded, making them an ideal choice for conveying hot and cold water. Consequently, they continue to be widely recognized by manufacturers and are steadily gaining a larger share of the market.