Some of the most common coating & lining services are FBE (Fusion Bond Epoxy), Synergy Wrap, Scotch Coating (Fletcher Coating), Spiral Wrap and Galvanizing. Common lining types are FBE (Fusion Bond Epoxy) & Cement lining. Casing and tubing, seamless steel pipe, drill pipes, pup joints and drill collars all require coating protection during use.These coatings are widely used to protect the steel pipe used in pipeline construction, reinforcement steel, and on a wide variety of piping connections. This protective layer of coating helps prevent corrosion, which can lead to leaks, service interruptions, and even explosions of the steel wall. The pipe size range for these services are normally 1/8” OD and up. Traditionally, this service is order specific.

Applied to the pipe exterior, coatings are the first line of protection against corrosion and other elements. Coatings prohibit corrosion, which can occur from corrosive soils, dissimilar metals, bacteria, stresses, or stray electrical current in the ground. To further the long performance life of steel pipe, Baowi Steel offers both dielectric and chemical inhibitor pipe coatings such as polyurethane and tape.

Cement Mortar Coating
Cement mortar provides a highly alkaline environment at the surface of the steel cylinder that chemically inhibits or dramatically reduces the rate of corrosion, commonly referred to as “passivation.” Applied under AWWA C205 conditions, rotating belts apply cement mortar to steel pipe in a high-velocity stream to a slowly rotating and translating steel pipe. Simultaneously, reinforcing steel wire is embedded into the mortar coating. Like cement mortar lining, the strength of the mortar coating adds to the pipe stiffness strength.

Polyurethane Coating
Polyurethane coating is a spray-applied bonded dielectric coating, which has excellent water and chemical resistance properties. Applied in a single coat process to meet AWWA C222 standards, polyurethane is tough, resilient, and extremely abrasion resistant. Like polyurethanes lining, polyurethane coating is a resilient coating that cures in minutes.

Epoxy Coating
Applied in a thin film to a near-white blast steel surface, epoxy coating is a bonded dielectric coating that provides optimum protection against abrasion, corrosive fluids, and extreme temperatures. Epoxy coating is durable and impact resistant resulting in a coating that will not crack, split, or fracture with impact. Baowi Steel applies epoxy coating in accordance with AWWA C210. Cure times for epoxy coating varies depending on product specified.

Galvanized steel pipes are steel pipes that have undergone a specialized coating process to prevent corrosion and increase their longevity. These pipes are typically made from carbon steel and are coated with a layer of zinc, forming a protective barrier between the steel and the surrounding environment. The zinc coating not only provides exceptional resistance against rust and corrosion but also enhances the overall strength of the pipe. They are also known as galvanizing pipes or pipes galvanized.

Manufacturing Process

Cleaning: The steel pipes are thoroughly cleaned to remove any impurities or residues, ensuring proper adhesion of the zinc coating.

Pickling: The pipes are then immersed in an acidic solution to remove any mill scale or oxides present on the surface. This step further prepares the steel for the galvanizing process.

Galvanizing: The cleaned and pickled pipes are submerged in a bath of molten zinc. Through a metallurgical reaction known as hot-dip galvanizing, the zinc forms a tightly boned coating on the steel surface.

Cooling and Inspection: After galvanization, the pipes are cooled and inspected for quality control. This step ensures that the zinc coating is uniform and free from any defects.

Do seamless steel pipes need galvanizing?
1. The answer is yes. Galvanizing is to coat the surface of the steel pipe with a layer of zinc, so that the steel pipe is protected by the zinc layer and is not easy to rust. Seamless steel pipes are also a type of steel pipe, and they can be galvanized. Moreover, galvanized seamless steel pipes have better performance than ordinary steel pipes.

2. Seamless steel pipes are not necessarily galvanized. The materials can be divided into carbon steel, stainless steel, and alloy steel. Generally, if the material is not specified, it is considered to be carbon steel. It is also possible to galvanize the pipe.

3. Galvanized steel pipes are steel pipes with galvanized surface. Galvanized pipes can be galvanized with seamless steel pipes or welded steel pipes. Whether it is a seamless steel pipe or a welded steel pipe, the surface is galvanized. It is called a galvanized steel pipe.

4. Galvanized steel pipes are also very durable, and their service life is much longer than that of seamless steel pipes. If the quality is excellent, it should not be a problem to use it for more than 20 years. Of course, welding and painting should also be done well, so as not to affect the service life of the galvanized steel pipe.