Advantages of stainless steel pipe compared with PPR pipe
The stainless steel water pipe is safe, clean, hygienic and durable. It is the best direct drinking water pipe.
Plastic pipe is generally made of synthetic resin, that is, polyester, stabilizer, lubricant, plasticizer, etc. It is mainly used for water supply system piping, drainage, exhaust and sewage sanitary pipe, underground drainage pipe system, rainwater pipe and threading pipe for wire installation.
The stainless steel water pipe has superior sanitary performance, eliminates the problems of “red water, blue-green water, dark water”, and has no peculiar smell, no scaling, no harmful substance precipitation, and keeps the water pure and harmless to human health. It has been used for decades in foreign countries. Laboratory tests in different countries show that the metal element precipitation of stainless steel is less than 5% of the standard value stipulated by who and European drinking water law (the regulations of all countries refer to these two standards). In fact, stainless steel has the characteristics of safety, non-toxic, clean and so on. The successful application of stainless steel in various fields related to human health for decades has fully proved this point and has become a well-known fact. With the continuous improvement of people’s requirements for water quality, the regulations and standards for pollutant discharge from water pipelines are more and more strict. The best pipeline for transporting high-quality drinking water is 304 food grade stainless steel.
Safety comparison between stainless steel pipe and PPR pipe
Safety and reliability is the most important requirement of building water supply, and the strength of material determines whether the water pipe is firm, durable, safe and reliable. The tensile strength of stainless steel pipe is 8-10 times of that of plastic pipe. In the case of external force impact, the possibility of leakage of stainless steel pipe is very small, while the leakage rate of plastic water pipe is relatively high, and the pipeline is easy to be damaged due to construction or secondary decoration.
The coefficient of thermal expansion of stainless steel pipe is similar to that of copper pipe, which is 1.5 times of that of ordinary steel pipe. In contrast, stainless steel pipe has the characteristics of slow thermal expansion and cold contraction, so it is suitable for hot water pipe. But the expansion coefficient of plastic pipe is too large, which is not suitable for hot water pipe. Under the condition of environmental temperature change, plastic pipeline is easy to leak, especially in concealed engineering
Comparison of corrosion resistance between stainless steel pipe and PPR pipe
One of the outstanding advantages of stainless steel pipe is its excellent corrosion resistance, which is the best among all kinds of pipe materials. Because stainless steel can be passivated with oxidant, a tough and dense chromium rich oxide protective film Cr2O3 is formed on the surface of stainless steel, which effectively prevents further oxidation reaction. The stainless steel pipe can withstand high flow rate, even if the flow rate exceeds 40 m / s, it still maintains a very low corrosion rate, no more than 0.003 mm / year, especially suitable for high-rise water supply. In general, stainless steel is not subject to localized corrosion. The chloride content of 304 stainless steel can reach 200 ppm, and that of 316 stainless steel can reach 1000 ppm. This conclusion is based on the experimental data and has been confirmed by experience.
How many people know that the plastic pipes we use have lethal causes like plasticizers? Because the plasticizers and antioxidants that must be added in the production of plastic pipes have carcinogenic effect on human body. The chemical additive “phthalein” softens the plastic pipe and has a great influence on human body. Recycling waste plastic and recycled plastic water supply pipe is also a big problem in the plastic water supply pipe market
Stainless steel pipe has the longest service life. The service life of stainless steel pipe can reach 100 years, which is the same as that of building. It is difficult to determine the service life of plastic pipe in China. The service life of plastic pipe is between 25-30 years. The aging problem of plastic pipe is more prominent. Sunlight, temperature, chemical substances, mechanical factors and time can all lead to its aging. Aging plastics are easy to explode under the impact of water pressure and water hammer, and their service life is greatly reduced. In addition, the hot-melt connection is easy to cause water leakage or material degradation.
Comparison of water flow between PPR plastic pipe of DN20 and stainless steel pipe of DN15
The stainless steel pipe wall is smooth, and there is no necking at the connection part of the pipe fitting. The water resistance ratio is much lower than that of the plastic pipe connected by hot melt, and the water pressure loss is small. Therefore, the pipe diameter of the stainless steel pipe is small and the flow rate is large.
Price comparison of stainless steel pipe and PPR pipe
From the economic point of view, people usually think that it is expensive to use stainless steel pipe, but the actual situation is not the case. The birth of thin-walled stainless steel pipe creates conditions for stainless steel pipe to enter the civil market. The service life of stainless steel water pipe is as high as 70 years. It can be said that the stainless steel water pipe is of high grade and the price is not high. This is the biggest advantage that other materials can’t match. When it comes to household water pipe, it must be in the impression of most people that PPR water pipe has been widely used in China for nearly 20 years due to its low price, light weight, high strength, easy construction and maintenance. PPR pipe is officially known as random copolymer polypropylene pipe, which is one of the most widely used water supply pipes in home decoration engineering. From the material itself, it is environmentally friendly and non-toxic, but do you know that because of PPR Plastic pipe has no self-cleaning function and bactericidal function, so it is easy to become the gathering place of water secondary pollutants and bacteria growing place, causing water environmental hormones and seriously threatening human health.
The advantages of stainless steel water pipes are particularly prominent
- 1. High strength, good seismic resistance and strong impact resistance, which is 3 times of copper pipe and 8-10 times of plastic water pipe;
- The flow velocity is large and can withstand the impact of high-speed water flow of 30 meters per second;
- 2. The coefficient of thermal expansion is low, which is 1 / 8 of that of plastic pipe. It has strong high temperature resistance, slow thermal expansion and cold contraction, and is not easy to leak;
- 3. It has strong corrosion resistance. After acid pickling and passivation, the inner and outer walls of stainless steel pipe produce oxide film, and the tolerable chloride content is up to 200ppm;
- 4. There is no hanging wall, the inner wall is smooth and clean without scaling, it is not easy to permeate, does not breed bacteria, does not release harmful substances under high temperature, and puts an end to secondary pollution;
- 5. The molecules in stainless steel pipe are closely arranged and the molecular weight is very small, so the aging and embrittlement will not occur under light and heat;
- 6. Health and safety: stainless steel is the only healthy material that can be implanted into human body, with a life span of 70 years; it is non-toxic, plastic and lead-free, and 100% of the materials can be recycled, which is green, environmentally friendly, energy-saving and emission reduction.
Source: China Stainless Steel Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.ugsteelmill.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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