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Main factors affecting wall thickness selection of stainless steel water supply pipe

Author:     Date: March 13, 2019    Source:    Focus on:

1、   Mechanical properties, corrosion resistance and wear resistance of materials

Stainless steel is a kind of metal material with excellent mechanical properties, excellent corrosion resistance and excellent wear resistance. Using sus The tensile strength of stainless steel pipe made of 304 stainless steel is more than 520mpa. The thin and dense chromium rich oxide film on the surface of stainless steel makes the stainless steel pipe have good corrosion resistance in all water quality including soft water, and the stainless steel pipe can withstand the erosion of high-speed water flow. According to the experience of more than 50 years of stainless steel water pipes in Germany and Japan, CJ / T 151-2001 is used standard The thick wall stainless steel water pipe specified in the paper can meet the requirements of water pipe More than 70 years of service life.

2、   Connection type of stainless steel pipe

Due to the characteristics of the installation process, the traditional welding, flange and other connection methods can only use the stainless steel pipe with relatively thick wall thickness. In order to ensure the connection strength and welding reliability of the pipeline, the wall thickness of the stainless steel pipe is generally required to be within Above 2.0 mm.

At present, the connection methods of various thin-walled stainless steel pipes are popular in the market,

 

Such as DN15 Stainless steel pipe is generally used zero point six The wall thickness above mm can meet the connection strength of the pipeline. However, stainless steel pipe with thicker wall thickness is adopted, such as DN15 Stainless steel pipe of zero point eight The wall thickness of MM can ensure the rigidity of the pipe and the connection strength of the pipe.

In the domestic market There are often manufacturers to recommend to customers In fact, most of the cheap stainless steel water pipes sacrifice wall thickness and strength to meet the demand of domestic price war Thin wall stainless steel pipe Connections have a lot of negative effects, Especially for the connection mode of clamping or ring pressure, Because these connections are based on the thickness of the wall to deform and form a seal with the fastener, but too thin pipe wall can not meet the strength requirements of uniform surface deformation, and it is easy to cause water leakage or water seepage accidents.

3. Economic requirements of users

In a sense, of course, the use of thicker stainless steel pipe can ensure the safety and reliability of the pipeline system. However, due to the high price of stainless steel, the increase of wall thickness inevitably means the increase of pipeline system cost. From the point of view of the user's economic requirements, as long as the wall thickness which can meet the service life requirements can be used. According to the use experience of stainless steel water supply pipe in Germany, Japan and other countries, the thick wall stainless steel pipe specified in the industry standard is adopted, such as The wall thickness of DN 15 stainless steel pipe is 0.8mm, which can fully meet the requirements of water pipe service life of more than 70 years.

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