Views: 0 Author: Site Editor Publish Time: 2022-04-02 Origin: Site
Steel pipes are the most commonly used pipes in water supply systems. They are also used in pipelines for natural gas, and sewerage systems. Although comparatively expensive to other pipes, they hold the advantage of being able to withstand high pressures and are available in more convenient lengths, and can also be welded easily, thereby resulting in lower installation and transportation costs. These types of pipes are highly efficient and can be used in small diameters as needed and are 100% recyclable compared to other materials. The pipes can further be melted down and turned into other usable material in industry. Furthermore, the high strength of these pipes and resistance to damage caused by human errors, tree roots, and extreme weather conditions make these pipes the ideal choice for most water and sewerage supply systems.
The disadvantages of steel pipes include thermal conductivity, which is very poor as there is a difference in heat transfer. These types of pipes are usually bonded with aluminum or copper to increase thermal conductivity and improve heat transfer. Cost is another issue, as these pipes are expensive and this is guided by the misconception of being a one-time purchase. However, steel pipes are difficult to fabricate and lack the malleable qualities that other materials have, therefore repairs and replacements of steel pipes are extra difficult
Steel pipes to BS 1387 are normally specified in the nominal bore sizes given in Table 1. Finishes can be black or galvanised, the latter being preferred for corrosion resistance.
TABLE 1. Nominal bore size steel tubes to BS 1387
Nominal size | Actual bore | Approximate o.d. | ||||
---|---|---|---|---|---|---|
Medium | Heavy | |||||
in | in | mm | in | mm | in | mm |
1/8 | 0.226 | 5.77 | 0.178 | 4.52 | 13/32 | 10.3 |
1/4 | 0.338 | 8.59 | 0.290 | 7.37 | 17/32 | 13.5 |
3/8 | 0.476 | 12.09 | 0.428 | 10.87 | 11/16 | 17.5 |
1/2 | 0.623 | 15.82 | 0.575 | 14.60 | 27/32 | 21.5 |
3/4 | 0.839 | 21.31 | 0.791 | 20.09 | 1.1/16 | 27 |
1 | 1.060 | 26.92 | 0.996 | 25.30 | 1.11/32 | 34 |
1.1/4 | 1.401 | 35.59 | 1.337 | 33.96 | 1.11/16 | 43 |
1.1/2 | 1.633 | 41.48 | 1.569 | 39.85 | 1.29/32 | 48 |
2 | 2.066 | 52.48 | 2.002 | 50.80 | 2.3/8 | 60 |
Steel pipes are normally used with threaded connections. Above 65 mm nominal bore, welded fittings to BS 1965 are recommended, although cast iron pipes with integral flanges or steel pipes with welded-on flanges may be used. In sizes smaller than 65 mm malleable iron fittings conforming to BS 143 and BS 1256 may be used for pressures up to 10 bar.
Screwed connections, to BS 21, are restricted to metallic tubes with thick walls.
Pre-Galvanizing Pipe is widely used in petroleum ,chemical industry, construction, shipbuilding, communications, electricity and underground gas pipelines and many other fields.
Pre-Galvanizing Pipe is galvanizing, Zinc layer is an electroplating layer, and zinc layer is separately stratified with the steel tube matrix.
Pre-galvanized steel pipe is the treatment of steel pipe before galvanizing: degreasing treatment, derusting treatment, phosphating treatment, drying treatment.
Hot dipped galvanized steel pipe is in manufacturing process using steel pipes of removed rust dipped into zinc liquid of 500℃ temperatures, and making steel surface attached zinc layer so as to achieve the purpose of anti-corrosion.
Hot galvanizing process specially suitable for kinds of strong-acid, alkali fog and other strong corrosive conditions. This kinds of fastener used a lot in outside of steel tower contribution.
Black steel pipes have a variety of use. Thanks to their strength and needs for little maintenance. They tend to be used for transporting gas and water to rural areas and urban areas or for conduits that protect electrical wiring and deliver high pressure steam and air. In addition, black steel pipes are also used in oil and petroleum industries for piping large quantities of oil through remote areas.
Other uses of black steel pipes include gas distribution inside and outside homes, water wells and sewage systems. However, black steel pipes are never used for transporting potable water due to the fact that they tend to corrode in water and mineral of the pipe will dissolve into the water and clog the line as well.
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Seamless pipes are manufactured by extruding the metal to the desired length. Thus, they do not have any joint in its cross-section throughout its length. seamless pipes are marketed on an outdated myth that it does not have flaws but that welded has an inherent flaw throughout the length of each tube, as stated above. Intuitively this concept is easily accepted by purchasers and designers with limited experience with the various products.
Steel porp refers to the use of steel pipe, H-shaped steel, angle steel, etc. to enhance the stability of the engineering structure. Generally, it is an inclined connecting member, and the most common are herringbone and cross shapes. Steel supports are widely used in subways and foundation pits. Because the steel support can be recycled and reused, it is economical and environmentally friendly.
Steel coil is sheet metal supplied in coil form. Depending on the production method, such coil is classified as hot-rolled, cold-rolled, galvanised or polymer-coated . Steel coil is used across industry, the main consumers being the construction and machine-building sectors.
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