Construction and Benefits of Hot Dipped Galvanised Pipe

A hot dipped galvanised pipe is preferred over other materials mainly due to its high corrosion resistance. It is created by plunging steel in molten zinc at high temperatures of 450°C and coating it with an extra layer of zinc. This is why this kind of pipe is best suited for applications that require high-temperature tolerance. It is easy to weld too and is extensively used in gas, hydro, oil and petroleum industries. The barrier coating on these pipes gives them long-run protection, thereby making them suitable for indoor as well as outdoor environmental conditions. Here in this article, we will find out more important information about these pipes.

How Hot Dipped Galvanised Pipe Is Created

A typical process of hot-dipped galvanisation is done as follows:

1. A caustic solution is used to remove any oil, paint, dirt or grease from the surface of the steel

2. An acidic solution is used to pickle the steel to remove any mill scale

3. Zinc ammonium chloride or any other flux is applied to steel to prevent oxidation when exposed to air

4. When the flux dries up, the molten zinc is wetted and applied on the steel

5. A zinc bath is prepared in which steel is dipped

6. The steel is kept in the bath until the steel temperature reaches that of the bath

7. Then the steel is allowed to cool down in a tank so that any reaction does not take place when exposed to the atmosphere

8. In some cases, lead is added to the bath to improve its fluidity, improve drainage, prevent floating dross, prevent uneven distribution of heat, and enable recycling of dross

Why zinc is used as the coated layer in Galvanized pipes?

Zinc element is far more active than the steel element. The zinc oxide layer in the surface of galvanized steel pipe prevents oxidation. During the time of electric-chemical corrosion, zinc absorbs the effects and decelerates the corrosion to save the steel pipe.

Benefits of Using Hot Dipped Galvanised Pipe

The major advantage of hot dip galvanising is to prevent steel corrosion. However, there are a number of other benefits too. Let’s talk about a few of them.

1. If you are going to use your pipes in harsh atmospheric conditions, then you need something that does not corrode over time. Hot dipped galvanised pipes provide long-lasting protection to the steel against corrosion.

2. Galvanisation coating will isolate the underlying steel from environmental conditions. The zinc layer remains tightly bonded with the steel inside to make damage difficult. Galvanisation will also provide cathodic protection to the steel, which means zinc will sacrifice itself to keep the steel protected. Even if the coating gets scratched, the zinc surrounding it will continue providing protection to the underlying steel.

3. Hot dipped galvanised pipe is extremely durable even when installed in a harsh atmospheric condition. This is probably due to the abrasion resistance, advanced coverage and even protection given by the galvanised coating. The zinc layer applied on the top is ductile and can absorb impact to a great extent.

4. These pipes are widely available in the market and are created in a huge variety of sizes and shapes. So, you can choose the one exactly as per your project requirements.

5. These pipes can be safely stocked or stored outside where they are being erected

6. Both steel and zinc, the two components of these pipes, are abundantly available on earth. Both of them are natural, and both are completely recyclable without losing any physical or chemical properties.

7. Hot dipped galvanised pipe does not demand any maintenance, thus providing an economic and environment-friendly solution for the future as well.

8. Since both zinc and steel can be used again and again for different purposes, these pipes are 100% renewable and recyclable.

Hot dipped galvanised steel pipes are extremely popular among people and constructors for a variety of indoor and outdoor applications. Due to their high corrosion resistance properties, they are being used today in different types of applications, including soil, sea water, fresh water, extreme temperatures, and concrete structures. A hot dipped galvanised pipe is much more durable than bare steel or iron. It is safe for the environment too in many ways. So, consider installing them in your structure and enjoy all of their benefits for long.