1. Traditional pipeline with messy material
Traditional pipelines have the following problems, which can easily lead to leakage, cracking and bursting, and high leakage rate:
● Water pipes are susceptible to aging and bursting under ultraviolet radiation.
● The pipe material is easy to oxidize, and corrosion leads to secondary pollution of water quality.
● Traditional pipes have poor pull-out resistance, soft materials and poor pressure resistance, and are easy to delaminate and fall off when thermal expansion and contraction are serious.

2. Unclear responsibility and authority, absence of management

The absence of pipeline management in front of the resident water meter is prone to responsibility shirking and management vacuum.

3. People's livelihood project and public opinion focus

Water quality is closely related to people's lives, and it is easy to become a hot and sensitive issue of public interest.

1, the State Council issued a policy

On September 6, 2013, the State Council issued the opinions on strengthening urban infrastructure construction
◇ Premier Li Keqiang emphasized: Accelerate the transformation and construction of urban water supply facilities, actively promote the overall planning of urban and rural regional water supply, and strive to achieve the dual goals of 95% of the national urban water supply penetration rate and water quality standards by 2015.
● In 2015, the State Council officially issued the "Water Ten Articles", with special emphasis on
◇ Clarify the drinking water standard time, main rectification measures, detection methods and detection points and the main body responsible for the implementation
◇ By 2020, the quality of centralized drinking water in cities above the prefecture level will reach or be better than the three categories, and the overall proportion will be higher than 93%
◇ By 2030 or so, the proportion of centralized drinking water quality in cities above prefecture-level cities to or better than three categories is generally higher than about 95%

2, the central ministries issued policies

●In January 2007, the Ministry of Health issued a new drinking water standard GB5749-2006 the "Sanitary Standards for Drinking Water". The water quality monitoring indicators for residents' drinking water were increased from 35 to 106, and water quality monitoring sampling points were required to be extended to The end of the pipe network.
●The notice and GB50015 of the "National Civil Building Engineering Design Technical Measures" issued by the Ministry of Housing and Urban-Rural Development on January 2, 2013 The "Code for Design of Building Water Supply and Drainage" clearly emphasizes that water supply pipes should be thin-walled stainless steel pipes.
On February 17, 2015, the Ministry of housing and urban rural development, the national development and Reform Commission, the Ministry of public security and the health and Family Planning Commission jointly issued the notice on strengthening and improving the construction and management of secondary water supply facilities for urban residents to ensure water quality safety, which will improve the quality of secondary water supply to the height of the national anti-terrorism strategy, It is clear that the pipelines, pools and equipment from household water meters (including) to municipal water supply facilities are entrusted by the owners or designated by the local people are responsible for operation and maintenance, actively encourage water supply enterprises to gradually extend the management of water supply facilities to residential water meters.
●The Ministry of Housing and Urban-Rural Development issued the "CJJ/T110-2017: Technical Regulations for Direct Drinking Water Systems for Buildings and Communities" on May 15, 2017, which clearly pointed out that the direct drinking water system should use stainless steel pipes and other high-quality pipes that meet food-grade requirements.
●The Ministry of Housing and Urban-Rural Development specifically pointed out in the "GB/T50378-2019 Green Building Evaluation Standards" implemented on August 1, 2019: Indoor water supply pipelines require stainless steel pipes and fittings.
The GB50015-2019 "Building Water Supply and Drainage Design Standard" implemented on March 1, 2020 points out that indoor water supply pipes should be made of stainless steel pipes with corrosion resistance and convenient installation and connection.

3. Local government policy

●Fujian, Changsha, Shenzhen, Nantong and other places have issued relevant regulatory documents, formulated technical specifications for secondary water supply pipeline systems, and clearly stipulated that secondary water supply pipelines into households should use stainless steel pipelines.

① Cold and hot water pipe network
② Solar energy pipe network
③ Direct drinking water pipe network
④ Secondary water supply network

Connection mode of combination of clamping and groove
DN15-DN100 double card pressure connection;>DN100 is groove connection
Connection mode of combination of clamping and welding
DN15-DN100 double card pressure connection;>DN100 is welded connection

Zhengkang brand stainless steel pipes and fittings are food grade stainless steel materials that are used in accordance with the national standard of the People's Republic of China "National Food Safety Standards, General Safety Requirements for Food Contact Materials and Products" (GB 4806.1-2016).
● No precipitation will not cause pollution to the water quality.
Stable performance, no chemical components volatile.
● metal pipe does not exist semi-permeable membrane effect, will not breed bacteria and other microorganisms.
● Stainless steel itself is not easy to corrode;
● Almost unaffected by the speed of water flow;
● Not affected by dissolved oxygen elements in water.
● Maintenance cost reduction
● Easy installation, fast installation
The life span can reach 70 years, and the average annual use cost is low.
● Stainless steel materials can be fully recycled.

GB/T29038-2012-Walled Stainless Steel Piping-Technical Specification
22S407-2 "building water supply thin-walled stainless steel pipe installation"
CECS153-2003 "Technical specification for building water supply thin-walled stainless steel pipe engineering"