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Pipeline industry development present situati

发布日期: 2012-7-21          浏览次数: 871


From this year with the growth of China's building materials industry also successively rapid development, take a pipeline industry is new pipeline industry constantly poured down market, stainless steel corrugated pipe, stainless steel profile tubes products have been very good development, introduces below stainless steel bellows under heat exchanger design standard is introduced and its related discussion and market of pipes material requirement analysis.

 

Corrugated pipe heat exchanger design standard is introduced and its related discussion

 

Abstract: the corrugated pipe heat exchanger is a kind of high efficient tubular heat exchanger, to promote its application scope, and carry on the strength and security research is necessary. Introduces the corrugated pipe heat exchanger strength design methods and main contents of the corrugated pipe heat exchanger, running problems were summarized, through design and calculation example analysis, explain corrugated pipe heat exchanger designing and selecting the problems that should be paid attention to, in order to offer the corrugated pipe heat exchanger design, manufacture, safety supervision and use department reference.

 

1, overview

 

In the early 1990s, our country developed a high-efficiency heat exchange component --, corrugated of heat exchange tube. Ripple of heat exchange tube is by corrugated pipe and joint two parts.

 

With bellows instead of smooth straight into corrugated pipe heat exchanger, its heat efficiency can be increased by 2 ~ 4 times, the efficient heat exchanger also has not fouling, temperature stress small advantages. However, due to the corrugated pipe is by thin-walled (wall thickness for 5 ~ 10mm) smooth tube to process, the shaping its stress state complicate. Its bundle the intensity and rigidity are with smooth tube has very big difference, causes the heat exchanger bundle and tube plate stress analysis is difficult. Due to the bundle and tubesheet strength unresolved issues, makes this efficient devices range was limited, simultaneously also has the potential safety problems. To make this kind of high efficiency and energy saving products can be applied to oil and chemical industry, more extensive of corrugated pipe heat exchanger strength study and set up a corresponding design standard is very necessary.

 

This work in 2002 incorporated in the state of boiler &pressure vessel standardization technical committee of project, by shenyang institute of chemical and shenyang special equipment testing institute (original shenyang pot inspection), and other units responsible for drafting, corrugated pipe heat exchanger design method as GB151 "tubular heat exchanger" appendix and 2004 called Mr Type body stainless steel bellows heat exchanger design standard case "(hereinafter referred to as" standard "a case) official promulgation.

 

This paper standard cases, introduces the main contents corrugated pipe heat exchanger for more than 10 years running problems were sum-up analysis, and through the design example is analyzed to show corrugated pipe heat exchanger designing and selecting the problems should be paid attention.

 


New pipeline industry development present situation analysis

 

In recent years, various new drainage pipeline constantly flocked to the market, especially the ban, galvanization to new pipeline's development has brought a once-in-a-generation chance. Therefore, UPVC, such as PEX, pp-r pipe, steel plastic tubes and aluminium pipe, copper, stainless steel tube, stainless steel and plastic pipe and so on various new pipeline, and further intensify the promotion and the market competition strength, presents a thousand flowers bloom contend and turmoil of the scene. Coupled with some fake fake products of opportunity in pipeline field immediately invaded, leading to a chaotic situation. The market in various pipeline between linger, shilly-shally.

 

A. rigid polyvinyl chloride (UPVC) tube:

 

Rigid PVC pipe is domestic before a few years the plastic tubing leading products. But because of UPVC pipes has had three problems, one is the glue is used to connect the way, and the international no one can solve problems; the glue toxicity 2 it is UPVC processing of additive of some ingredients could become in the bacterium nutrition agent, make the residual bacteria accelerated reproduction, Three is due to the presence of large amounts of PVC macromolecules monomer chlorine atom, recently theorists for this pipe is possible free of chloride ion pose a new water pollution put forward a lot of questions. So the tubing will gradually faded out of water areas. Because of its low prices, in the drainage system will be used in large amounts.

 

B. polyethylene (PE) tube:

 

Polyethylene tubing is divided into low density polyethylene (LDPE), medium density polyethylene (MDPE) and HDPE). PE pipe of prominent advantages is health non-toxic, its flexibility, impact resistant capability are higher than UPVC pipes. However, its use lower temperature (low pressure polyethylene melting point is about 130 ℃, high pressure polyethylene melting point slightly above 100 ℃), is rarely used in hot water pipe. In addition, polyethylene and linear expansion coefficient, and easy to stress cracking, not easy dyeing deficiencies. Due to its flexibility is good, mainly applies in the gas supply, agriculture and other areas.

 

C. the third type of polypropylene (PPR) tube:

 

Polypropylene is colorless, odorless and non-toxic materials, with excellent heat-resistant property and high strength, suitable for building indoor gemi supply system, also widely applicable to heating system. Its defect is low temperature difference, linear expansion coefficient and brittleness, changeful form, not suitable for building Ming outfit pipeline engineering. Because pp-r pipe of hot connection safety, can *, mainly applied in water supply system of dark outfit pipeline.

 

Metal pipes 2.

 

Galvanization steel tube disable around, brass, pure stainless steel tube as high-grade metal pipes in the domestic water supply domain appeared a range of application. Its advantages are: high strength and corrosion resistance, good appearance is luxuriant, long service life. However, the high costs, high-grade price greatly limits its application scope.

 

Face this kind of chaotic state, the relevant departments of the state and are eager to seek a galvanization to substitute, to further standardize market. Because the engineering accident no size, engineering quality relates to the national economy and people's lives.

 

So, who can sprung up, and become the leading products replace galvanization? We think mainly depends on the following aspects:

 

Product quality: can you really sure you use 50 years.

 

Product price: whether suitable for China's current consumption level.

 

Supporting services: pipe fittings for varieties of specifications, can complete, product pre-sale and after-sale service system could grade.

 

Now we are afraid of market main service pipe analysis:

 

Plastic pipes. 1.

 

Along with the rapid development of macromolecule material technology, the development and utilization of the plastic tubing deepen ceaselessly, nearly 20 years, our country plastic pipes of the development and the production promotion are made tremendous achievements. Nowadays, has already developed can be used in the main water pipeline engineering plastic pipes, UPVC pipes, PE pipe, PEX tube, the PPR pipe, etc. The plastic tubing common advantages for low price, health, corrosion resistance, thermal conductivity small, not fouling, water performance is good. But, plastic pipe has its insurmountable faults, mainly displays in: surface hardness, low intensity difference, construction process are easy to be damaged; Steels are large, strong, low-temperature brittleness, the scope of the narrow difference weathering resistance, In addition, plastic pipe anti-ultraviolet radiation ability is poor, long-term illumination aging, there is no guarantee that the engineering quality and 50 years of service life.

 

3. Metal and plastic pipe

 

Because plastic pipe material existence all aspects of the inner defects, difficult to overcome all kinds of metal and plastic composite pipe arises at the historic moment, on the market at present have representative composite pipe including plastic pipe:, copper pipe, carbon steel and plastic pipe, stainless steel and plastic pipe, etc.

 

A. pipe: :

 

Pipe: be in last few years is widely used in the field of water supply a new pipes, composite pipe family is of certain representativeness. Its advantage is: lower prices, health corrosion and flexible installation. But in the extensive use of the two, in many major projects in present continuously for pipe: caused by the pipe burst, interface leaking such quality accident. Cause some areas have banned continue to adopt this pipe, the national construction ministry also is intended for pipe: application modes for internal rectification.

 

Pipe: the existing problem is: (1) the inner aluminum alloy welding, can not be implemented inert gas protection, and the existence of intermediate aluminum alloy welding have peroxide but does not arrive problem, cannot ensure the tubing compressive strength, occurrence blowout and quality problems such as leakage has become inevitable. (2) pipe: because of its material properties of limits, cannot solve big caliber pipe connection problems affecting the pipes to further promote the use. (aluminous model canal cannot classification recycling, do not accord with environmental protection requirement.

 

Because of its connection convenient, pipe laying without connectors can remote characteristics and is currently in the temporary construction and the family is decorated in still has use.

 

B. copper plastic pipe:

 

Due to the brass itself coefficient of thermal conductivity is big, heat faster, and copper exterior easy oxidation formation aeruginosa wait for a reason, appeared on the market at present in a brass surface composite layer plastic heat preservation copper wood-plastic composite.

 

 

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