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Stainless steel plays an important role in water treatment, storage, and processing, whether it is drinking water, ultra-pure water, wastewater or runoff water. The value of stainless steel here is mainly due to its corrosion resistance in a wide variety of chemical water and the purity of drinking water and high purity water

In general, drinking water is less corrosive than food, and in the early days, when stainless steel was used in wading only for certain uses, it was often considered too expensive for general use. It took many years to show how cost-effective it was.

In the 1970s, the corrosion resistance of stainless steels in various treatment processes was evaluated systematically for the first time, and stainless steels and other alloys containing 9% nickel (S30400) and 12% nickel (S31600) were tested in a wastewater environment. Based on favorable test results, Austenitic stainless steel has gained greater application in water treatment piping and various other in-plant uses such as clarification facilities, mud scraper arms, and bolts.

Similarly, the use of stainless steel in the treatment of drinking water for human consumption has grown and is now considered a necessary material. Membrane treatment units are commonly used in water treatment plants to remove bacteria, gums, and drinking water pathogens such as cryptosporidium. Plants without membrane units use water purification methods such as ozone The treated water is chlorinated before being sent out and stored in a tank or tank. These tanks are made of stainless steel pipes and plates.

Desalination has become more important in water technology, turning seawater or salt water into fresh water. The treatment of more corrosive water requires more highly alloyed stainless steels, such as duplex steels, super duplex steels, and Austenitic stainless steel. They are used at all stages of water treatment processes such as chloride flow, membrane containment units, concentrated salt, and water, while standard materials can be used to store fresh water. The world desalination industry has grown by 240% in the past decade and shows no sign of slowing down.

 In Asia, Australia and Europe, stainless steel distribution and service pipes are used to deliver treated water directly to homes and businesses. In Japan, some water distribution pipelines are buried underground, while others are propped up on the side of a river-crossing highway bridge. In Europe, Germany is a leader in the use of stainless steel pipes. One famous example is the Allianz Stadium in Munich, which was built for the 2006 World Cup. More recently, China has switched to stainless steel water pipes to meet the needs of the 2008 Beijing Olympics, including for the Beijing National Stadium and the National Aquatics Center.

Stainless steel water pipes are commonly used in high-rise buildings to allow lift pumps and branch pipes to withstand high pump pressure. Examples of such applications include the Taipei financial center in Taiwan, petronas‘petronas‘Petronas towers in Kuala Lumpur, the China Central Television Headquarters in Beijing, and the Aurora Tower in Brisbane, Queensland, Australia. In Scotland, 316L (S31603) stainless steel is required for the delivery of hot and cold water to health facilities, as is the new Palomar Mercado Medical Center in San Diego County, California, the largest medical facility in North America to be built soon.

Piping materials are often used in conjunction with stainless steel fittings, pipe hoops, outlet sleeves, and repair clamps. These use usually involve buried structures, and although the fittings are exposed to a wide variety of soils, no problems have actually been reported.

Most of the stainless steels used in water pipes are austenitic steels (304 and 316), but duplex stainless steels are beginning to be used, especially in large diameter piping systems.

In the process of building a 244-cm (96-inch) diameter hoist for the Roundout reservoir, Manhattan I.‘s Drinking Water Source, the city‘s environmental protection agency conducted immersion tests to select reliable materials that could provide a service life of at least 100 years. Based on the results of this experiment, the EPA selected 304 and 316 stainless sheets of steel in the hope that they would still be in use in 2112, one hundred years from now.

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