Steel pipes with galvanized coating

Galvanized steel pipes are made by dipping steel pipes into molten zinc. Most homes built prior to the 1960’s and some even as late as the 1980’s used galvanized steel pipes for their plumbing system. The Pipes and tubes that we manufacture are made of galvanized steel, are primarily used as building materials in construction industries. ASPL┬ábrand galvanized tubes are hot dipped with zinc coated made of steel that has been covered with a layer of zinc metal. As a result, black steel pipes are more commonly used to transport substances like oil and gas rather than water. Unlike galvanized steel, which is coated with a layer of zinc, stainless steel is mixed with a metal alloy like chromium, nickel or carbon.

Consider choosing galvanized steel over other types of steel if you need an affordable option and if the material your pipes conduct, rather than the strength they need to support, is your primary consideration. Galvanized steel, or steel covered in zinc, was designed specifically to resist rust and corrosion. Remember, all types of industrial steel pipes – galvanized, stainless and black – come with these benefits.

It offers high corrosion resistance and a lower installation cost as compared with schedule 40 galvanized steel, or Type L copper pipe. Galvanized steel, primarily for storm systems, with mechanical couplings or plastic-bonded piping can be specified when a risk of flooding due to pressure seems possible. However, some contractors propose replacing galvanized steel domestic-water pipe with copper up to 6-in.

Galvanized steel pipe has all the advantages of steel pipe, plus improved corrosion resistance in most environments, although at a slightly higher cost. Galvanized steel pipe is steel pipe that is dipped into a pool of zinc (see Figure 1). Galvanizing has two methods of corrosion reduction: However, corrosion is an issue in steam-condensate pipes, and many engineers specify schedule 80 steel pipe simply because it takes about twice as long to rust through as schedule 40 pipe.

It also is a good choice for steam and steam-condensate systems because it handles high temperatures and pressures well, and corrosion is normally not an issue in steam pipes. Steel often is used for closed hydronic systems because it is inexpensive, especially when compared with other materials in systems with high pressures, and corrosion is relatively easily controlled in these systems. The ECS team was the first to identify the acute vulnerability to oxygen corrosion of galvanized steel piping in dry and preaction fire sprinkler systems.

Many continue to believe that galvanized steel pipe provides better corrosion protection in fire sprinkler piping installations. Wet Pipe Nitrogen Inerting (WPNI) must be used to stop ongoing corrosion in any galvanized steel or black steel wet pipe system that is experiencing corrosion-related leaks. Galvanized steel piping can be used in deluge systems if special care is taken to eliminate standing pools of water within the piping (pitch and auxiliary drains). Never use galvanized steel piping for wet pipe fire sprinkler systems.

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