Pipes can be of different sizes according to the usage that is high or low pressure exposure so that the size or measurement of the pipes or tubes defines usage. The diameter of the steel pipe is modified depending on usage as well as the wall thickness. Welded non – alloy steel pipes of circular cross section not be more than 3.0 4.8 millimeter (12 inches). Outside diameter steel pipes regardless of wall – thickness, the surface finish of standard steel pipes could be black, galvanized or painted. Whereas, end product can be plain, leveled threaded and coupled.

The standard steel pipes intended for the low pressure convergence of water, steam, natural gas, other liquids and other gases in plumbing and heating systems, air conditioning units, automatic sprinkler systems and other related usage. Standard steel pipes and tubes may also be used for light loading bearing applications such as fence tubing.

Structural pipe tubing of framing and support members for recreation or load bearing purposes in construction, ship building, trucking, farm equipped and related industries.

Plumbing is referred to as system of pipes and fixtures installed in a building for the supply & distribution of portable water and removal of water borne wastes. Plumbing is generally is differentiated from water and sewerage system and serves for a single building while water and sewerage systems serve a group of buildings or a city. Plumbing industry forms a basic and important part of every developed economy due to requirement of clean and pure water and proper collection and transport of wastes. Plumbing tubes are specifically designed tubes for uses in plumbing systems and applications. These tubes are used for variety of purposes such:
• Underground water services,
• Portable water distribution,
• Drainage and waste system,
• Medical gas system,
• Fuel oil and gas distribution systems.

Rectangular steel pipes are tubes are used in different industrial equipment’s. These are used for accomplishing different purposes. The common areas, where these rectangular pipes are used are supermarkets roads, container fabrication, industrial plant structure, bicycles, furniture etc. There are several guide lines for defining the rectangular pipes and tubes.

These guide lines are length, width, height, welding gap, radius , diameter. According to the nature of the requirements, the size of rectangular steel pipes and tubes can be altered. The thinner or be slimmer tubes are used for developing structures and frames.

Due to its versatility the rectangular tubes are commonly used in various segments. For structure Building or house construction, the rectangular steel pipes are used as beams.

Galvanization is the use of chemical process to cover the steel with a layer of Zinc. The idea of Galvanization was born in 1770; however, the actual process of galvanization took place in 1830’s. After twenty years of experiments, finally galvanized steel pipes are manufactured and being used

In 1850’s. Initially, initially the production of galvanized steel was complicated only in Europe, Italy. Later in 1870, followed by United States.
The first patent for galvanization process was used by French engineer in 1937.

Galvanized steel are those steel that has been covered with a layer of Zinc metal. During galvanization, steel is immersed in a molten Zinc both ensuring a tough uniforms barriers coating Zinc’s natural corrosion resistance provides long term production to the steel pipes when it’s expressed outdoor . Apart from presenting water corrosion it’s equally effective for dry indoor use.

A pipe formed by electric resistance welding or ERW having one vertical beam without addition of any metal is called ERW pipes or tubes . It can be available in varied diameter and wall and wall thickness . The sizes of pipes ERW pipes can range from 23/8 inch to 24 inch outer diameter length can over 100 feet.

How ERW Pipe is made?

First the iron is flatten then place it into roller to form a tube and passes through a Welding electrode made of copper disc which is connected to revolving transformers. When electrodes Contact each side the temperature is measured to the welding paint . Once the tubes leaves the Electrodes, the inside flash is removed by after rolling the tube with a hammer and the outer flash by Cutting tool. The finished surface could be either bare or coated.

Qualities of ERW Steel Pipes:-

Before reaching the market place, ERW steel tubes and pipes are routed through numerous tests including a hydro-test an ultra-sonic weld injection bevel check micro meter check, straight meters evaluation and ring gauge to ensure its quality. The high performance ERW steel pipes and tube possesses better corrosion resistance ,deformable and toughness.

Usage of ERW steel pipes & Tubes:-

These pipes are used in fencing pipe lines, water and gas convergence, structural engineering purposes. There has been tremendous increase in the production of ERW steel tubes due to growing demand in oil & gas industry, infrastructure and automobile usages.