1、 In the 17th and 18th centuries, these tubes were made of wood, and still exist in London today, but they were replaced when they were found to be moldy and infected with E.coli.
Before the 1860s, most of the water pipes were made of lead and tin, but they were found to be too dangerous and weak to drink, so they were replaced.
Before 2000, most countries began to use galvanized pipes. Due to the low cost, it was later found that they would rust, so they were replaced. A few rich developed countries, with stainless steel pipes, so far have no problems.
After 2000, it is the age of plastics. The strength density of PVC / UPVC is very small. Now there is no problem.
2、 Due to its low cost, other hot-dip galvanized pipes can also be corrosion-resistant within a certain period of time. It is forbidden to use cold galvanized galvanized pipes. There may be plasticizer residues in PPR pipes. In fact, 316 medical stainless steel pipes have molybdenum (titanium alloy is not included, it is too expensive, maybe UAE oil prince can afford it? But they may use golden faucets. And prince charming but even in Beijing's Olympic Stadium, as the only level of use 304 bar. Good materials are too expensive.
3、 It can't change the customs and the Customs said that although there is a trend to replace the old type of pipes such as copper pipes with new materials such as PVC plastic pipes, with the production and use, the results show that the chemical additive phthalein in PVC (in order to make the pipes soft) has great damage to human body, kidney, liver, Since 2004, the Ministry of construction has restricted the use of technology, and has stopped using lead salt as a safety agent for PVC pipes. In recent years, the domestic research mood seems to return to the traditional discussion of steel pipe. After all, copper is safe It is still a new type of high quality pipe There are many stories. But it reminds people that although it is good to seek innovation, we should be down-to-earth and pay more attention to problems rather than surface phenomena.
4、 So there are many common dangerous houses such as low-cost houses and large plate buildings that have been in use for 20 or 30 years. So the building materials are seeking capital. The regulation is 0. Galvanized steel pipes and even hot-dip galvanized steel pipes will corrode in about 20 years. They can be used outdoors for 10 years. Now, the galvanized pipes of the new national standard are 300g / m2. Once there is a standard, the water pipes are mainly galvanized pipes and cast iron pipes, PVC lead salt pollution.
The above is the relevant content introduced by Jinan galvanized pipe manufacturer. For more information, please visit the website: http://www.jnxxjm.com