Comparison of the application of PB pipe and copper pipe in water supply pipe.

- Jul 25, 2018-

With the development of science and technology, people's living standards have improved, and "health" and "security" have become the two most concerned topics of modern people. The quality of drinking water and the safety of water pipes have naturally become one of the focuses of attention.


Water supply system (watersupplysystem) water supply, water delivery, water treatment and water distribution facilities are combined in a certain way. It refers to a network that is organized and transported to water use sites through pipelines and ancillary equipment in accordance with the production, living and fire protection needs of buildings and users. At present, hot water supply pipes for civil buildings usually use copper pipes and PB (polybutylene) pipes. The two pipes are now compared as follows:

First, the manufacturer


Copper tube


Due to its long history of use, its processing and molding processes and equipment are very mature and are mastered by most similar manufacturers. Therefore, there are many manufacturers of copper pipes at home and abroad, and the quality and price are also very different. Moreover, the recycling rate of copper is very high, so that in the production process of individual manufacturers, in order to reduce costs, recycled copper scrap is often used (the difference between pure copper and copper is very large, and the copper is not used in the water supply pipeline. In line with the health standards), coupled with the comprehensive factors of production management, equipment, technology, quality awareness, etc., the quality of copper pipes currently on the market is mixed. According to the survey, the copper pipes with better quality are produced by well-known foreign companies. In addition to the more expensive prices, their technical services and support are restricted by the production bases abroad.


2. PB tube


The development of PB polybutene was applied in the early 1970s. Its material properties determined that the technology and equipment for production profiles were high, and the fixed assets were large. The general small-scale manufacturers did not have the technical conditions and capital capacity for production. Therefore, only a fairly large-scale, well-established, well-managed enterprise has the ability to produce. At present, well-known foreign companies have successively established the production base of PB pipes in China through sole proprietorship or joint venture. With over 150 years of research, development, production and application of piping systems, the Swiss company George Fischer has set up a production base for PB pipes in Pudong, Shanghai, and established Shanghai George Fischer Piping Systems Co., Ltd. Shenzhen has set up a branch to provide customers with the most complete after-sales service and strong technical support. It is understood that the PB-INSTAFLEX hot water pipeline system produced by the company is the hot water water supply pipeline system with the most complete system support, the most comprehensive system technology application and the most guaranteed product quality.


Second, economic evaluation


Due to the essential difference between copper and polybutene materials in the production of raw materials and the density of copper materials is more than 8 times that of polybutene materials, and the complexity of the copper pipe system connection process, resulting in the production, processing and transportation of copper pipes. To the construction, it is much larger than the PB pipe in terms of energy loss and difficulty in operation. Whether it is for the society or for the specific construction and use units, the cost and cost are high. Taking installation as an example, according to the quota, the overall price of the copper pipe is 1.7 times higher than that of the plastic pipe. Therefore, in terms of social and economic benefits, PB pipes have more vitality than copper pipes.

Third, the performance characteristics are compared


Copper tube


Copper is a traditional metal material. It has a long history of pipe and good mechanical properties such as impact strength and pressure resistance. Chemical and physical properties such as corrosion resistance, heat conduction, electrical conductivity and continuous crack resistance are not conducive to use in hot water supply pipes. The system is easy to scale due to the roughness of the inner surface of the pipe, and slowly releases heavy metal ions in long-term use, which affects the water quality to some extent.


Copper pipes are a relatively traditional but expensive pipe material that is resistant to heat, corrosion, pressure and fire and copper can inhibit bacterial growth and keep drinking water clean. Among many imported sanitary products, copper pipes are the first choice. Price is the most important factor affecting its use.


Advantages: high strength, stable performance, not easy to corrode.


Disadvantages: high price, difficult construction, in the northern climate environment, it is easy to cause heat loss, energy consumption, high cost of use.


2.PB tube


The PB tube is a polybutene polymer material, which was jointly developed by the Swiss company George Fischer and US Shell in the late 1970s for the water supply pipeline system. The material is light in weight, flexible and corrosion resistant. It is particularly resistant to high temperature when used in pressure pipes. It can be used at 95oC for a long time, and the maximum operating temperature is 110oC. The surface roughness of the pipe is 0.007, no scaling, no need for insulation, protection of water quality, and the effect is very good. Soft texture, suitable for floor heating / high temperature heating, so it is mostly used in heating / hot water systems.


At present, in developed countries such as Europe and the United States, PB pipes have been widely used, and copper pipes have become the preferred material for hot water supply pipes.


Advantages: high temperature resistance and not easy to deform, non-toxic and harmless, smooth pipe wall, no scaling, good thermal expansion, easy to repair and modify.


Disadvantages: domestic raw material manufacturers are expensive


Fourth, system technology application


1. Copper tube (traditional product):


The piping system of the copper pipe is relatively complete, but the connection must be welded and threaded. The process is complicated, and the installation technicians have high operational requirements, which are difficult to grasp and the reliability is not high. At the same time, the pipeline layout is relatively rigid and the flexibility is very poor. As well as the pipe fittings are heavy and need to be insulated, it also brings inconvenience to a series of work such as transportation, handling, storage and installation.


2.PB pipe (green product):


The connection of the PB pipe is a hot-melt connection method, the process is simple and easy to grasp, the steel-plastic conversion is realized by the squeeze clamping method, and the installation connection is less affected by human factors, safe and reliable. The flexibility of the PB tube brings great flexibility to the arrangement of the pipeline, especially the small-diameter coil, which makes it easier to realize various forms such as special line, ring line and circulation line in the pipeline arrangement. The PB-INSTAFLEX hot water piping system produced by George Fischer is particularly prominent in system technology applications, from pipe placement to nozzle positioning; from thermal energy distributors to jacketed pipes; from proprietary hot melt Machine tools, tools and patented extrusion clamping technology cover every detail of the whole pipeline system, which better solves the positioning of hot and cold water tap installation and the heat energy existing in the arrangement of traditional hot water piping system (hot water The output is gradually attenuated, so that the pipeline system is safe, reliable, energy-saving and efficient.