Pipe
traditional galvanized steel and cast iron for easy drainage of general corrosion because of involvement of the main causes of anger building transport to be replaced. Water supply and sewage pipes are mainly used in plastic pipes, metal pipes composite of three.

Plastic Pipe

plastic tube is a resin additive made by melt molding products. The additives are plasticizers, stabilizers, fillers, lubricants, dyes, UV absorbers, modifier.

plastic pipes commonly used are the following: rigid PVC pipe (PVC-U), high density polyethylene pipe (HDPE) pipes of crosslinked polyethylene (PE-X), a tube Polypropylene Random Copolymer (PP-R), polybutylene pipes (PB), engineering plastics, acrylonitrile – butadiene – styrene (ABS) and so on.

Widely used in the construction of new sewers

1 1 The composition of the raw materials determines the properties of plastic pipe plastic pipes. The major advantages of plastic pipes:

(1), chemically resistant, good free of environmental factors and the impact of the pipeline components in the media, corrosion resistance.

(2) small thermal conductivity, low thermal conductivity, thermal insulation, the effect of saving energy well.

(3) power hydraulic line, smooth wall, the drag coefficient is small and difficult not to change fouling channel section of the tube with time, channel blocking low probability.

(4) compared to metal pipe, the density, lightweight materials, transport, easy to install, flexible, simple and easy maintenance.

(5) can have a natural inclination or cold, may have power, the means for the supply coil are used to reduce the number of pipe connections.

The main disadvantage of plastic pipe systems:

(a little) resistance to mechanical stress, poor, poor stiffness, straight sex was bad and thus the control the density of the high cards and suspension.

(2) flame retardants is low, most plastics fuels, pyrolysis and combustion, there are toxic gases and smoke.

(3) thermal expansion coefficient of flexible, must pay very stressed.

performance of plastic pipes

The physical properties

The physical properties of plastic pipe. And the channels of aluminum-plastic composite pipe, steel pipe, copper pipe, plastic pipe physical properties such as the use of offsets and pipe insulation and so on. For example, are:

(1) PVC-U, PP, ABS relatively high mechanical properties, such as “tight control” considered, the installation better tomorrow. On the contrary, PE, PE-X PB as a tube “for hidden.

(2) the use of plastic pipe and the temperature determines the heat resistance of PVC-U, PE, ABS can not be used for cold water pipes and PE-X, PP, PB can act as a hot water line. In building a system of water pipes and hot water and cold when the heat resistance of the uniform as an important goal.
< br /> (3) plastic tube by thermal expansion coefficient is high, especially in the plastic pipe as a water pipe, with flexible interfaces, expansion joints or curves of the various compensatory measures such as more heat. Among them, PE, PP, and most other polyolefins. If this is not the time of construction and installation of adequate attention and appropriate technical measures to take, is extremely vulnerable to the interface of joints and remove the problem.

(4) the low thermal conductivity, superior thermal insulation performance of plastic pipes can turn the thickness of the insulation or without thermal insulation. If on between the various plastic pipe insulation thermal conductivity, but also with their respective thickness.

performance under Print

The performances are by the pressure in the plastic tubes affected under certain conditions, to withstand pressure and internal destruction of the time under constant pressure. To determine the design parameters and in relation to the quality of evaluation and monitoring. the implementation of general two tests: hydraulic pressure test and long-term test at high temperature hydraulic pressure. On the water piping used.

Health Performance Indicators

physical health. If PE, PE-X, PP, ABS and PB simply compliance. The U-PVC pipe should be in the production of PVC resin and non-toxic stabilizers for the health and hygiene to be performance requirements .

(1) the application of plastic pipes for water

PVC pipe usually low cost, without considering the impact on the quality of water supply in water are preferred in the cold water line, and if the temperature is high, can be used, or cross-linked polyethylene pipes and tubes made of polyethylene, polypropylene tubes, pipes polybutylene terephthalate.

(2 ) the application of plastic drain pipe

single material: PVC structure in various forms: base pipe layer foam pipe blank wall, spiral pipe, spiral layer of foam core and spiral air wall. The existence of Some problems:

(1) thermal expansion coefficient must be compensation for the expansion to solve to resolve.

(2) stiffness of the small, straight, mismanagement must encrypt the card, the chassis, suspension to solve.

(3) poor heat resistance, is the low softening temperature, should control the water temperature to limit and the restriction of the use of space and distance to the solution of the heat source.

(4) flame retardants arms on the floor, roof Master firewall, coat-tree-service needs of the fire and fire to solve Schubring height.

(5), low impact strength, construction technology and careful design must resolve to strengthen.
(6), poor insulation, the sound of the plastic pipe is larger than cast iron pipes, pipeline construction and pipeline near Ming bedrooms located, the problem is particularly important. Noise reduction methods to the acoustic pipe insulation to improve materials, pipe foam pipe layer white wall is made of this idea, the sound of a different kind manner and is constructed to the flow, tube change spiral is developed on the basis of this idea. The idea of combining these two methods is the core layer and the spiral development of air-walls.

; the same conditions, different types of plastic drainage pipes, the results of the investigation of the noise:

芯层 发泡 管> 空 壁 螺旋管 管. “onmouseover =” this. Style. backgroundColor = “# ebeff9″ onmouseout = “this. style. backgroundColor =” # fff “> General Management> Foam core pipe layer” empty spiral> pipe wall.

The use of drainage drainage instead of plastic work in the iron pipe. Currently, the plastic drain pipe a height of 100m in the building for use in buildings, but progress varies in different areas. If the building height greater than, equal to 100 m tall buildings and are not suitable for plastic drainage pipes in hand, cast iron drainage pipe can be used flexibly earthquake.

metal pipes third galvanized steel
< br /> galvanized pipe n is not intended to replace the metal pipes have been replaced or that the water supply of galvanized steel will be replaced in the building.

3 2
;
copper pipe metal is the dominant copper, brass and more applications, more services, pipes and fittings are complete, the interface methods varied, more applications in the hot water pipe is the main problem that the amount of available copper fold slightly higher.

3 3 cast iron pipe

; iron pipes and water is not easy, compared to corrosion, low cost and good durability suitable for the funeral. drawback is alive, the weight of the long, large and small. Socket Connections commonly used connection.

Clamp style cast iron pipes is the construction of a new drainage pipe, 20 century, access to international markets since the 60s, after decades of promotion and use of this tube has been widely recognized by the international community. That made pipe with a drainage pipe, traditional style cast iron has many advantages in comparison, is a substitute, but because pipes and Connections for relatively expensive, it was not in the country to promote popular.

composite pipe

complex with a lead pipe coating, rubber tube glass-lined. composite pipe especially when working on (which requires water corrosion), base course, requires the protective layer (corrosion resistant) form. “br /> /> < br generally metal composite pipe for coupons, coated with epoxy resin and cement It is light weight, smooth-walled, low resistance power has marked a good resistance to corrosion; parties support soft and the high-strength metal, non-metallic pipes and internal and external, such as plastic pipe aluminum composite panel, which is characterized by corrosion and Wall-scale pipeline will ensure that the quality of water, metal pipes in the medial and lateral non-metallic tube, such as copper and plastic, the use is of poor thermal conductivity of plastic pipes covered insulation and protection.

After the metal parts can be divided:

(1) steel-plastic composite pipe;

(2) made of stainless steel – composite plastic pipe, plastic coated steel pipe; />




< br (5) lined aluminum tubes.

It must be said composite pipe of the pipe diameter of ≥ 300 mm or more in the sewer line is better. It combines the advantages of a metal tube strength, stiffness and non-metallic pipe corrosion. But it is the slow development of a tube. This is because:

(1) The two types of tubes and the high price of a single tube. />
< Br (2) thermal expansion coefficient difference of two important documents, such as the obligation is not strong and modify the ambient temperature and the average temperature is more intense, easily torn, which led to lower quality.

composite pipe joints, the cold heat treatment methods, the plastic liner to melt elongation, deformation or even. Generally, threaded, ring, necklace and other compounds.

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