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Although HDPE double-wall bellows and PVC double-wall bellows are called double-wall bellows, but in addition to the appearance of a little similar, in many places they are very different, if you don’t believe it, just look at the small series for you to list these different it.

I. UPVC double-wall bellows

UPVC double-wall bellows, also known as PVC-U double-wall bellows, is a special pipe with smooth inner wall, corrugated outer wall and hollow inner and outer walls processed and produced by polyvinyl chloride as the main raw material. The pipe has beautiful appearance, unique structure, high strength, smooth inner wall, small friction resistance, large circulation, the foundation does not need to do concrete foundation, light weight, easy handling and installation, fast construction; Rubber ring socket connection, reliable method, easy to ensure the construction quality; Flexible interface. Strong resistance to uneven settlement; Good leakage resistance, corrosion resistance to a variety of chemical media; There is no scale in the pipe, basically need not dredge, buried service life of more than 50 years.

Physical property

Connection seal test does not break, no leakage impact test TIR≤10% ring stiffness S1≥4KN/㎡, S2≥8KN/㎡ ring flexibility does not break, two walls do not come off oven test without splitting, cracking, bubble Manning roughness coefficient n=0.010.

2, HDPE double wall corrugated pipe

HDPE double-wall corrugated pipe, also known as polyethylene double-wall corrugated pipe, is a new type of lightweight pipe made of high-density polyethylene. It has the characteristics of light weight, high pressure resistance, good toughness, fast construction and long life, etc. Its excellent wall structure design greatly reduces the cost compared with other structures of pipes. And because the connection is convenient and reliable, it has been widely used at home and abroad. Lots of replacement concrete pipe and cast iron pipe. Performance characteristics:

HDPE double wall corrugated pipe has excellent chemical stability, aging resistance and environmental stress cracking resistance. The HDPE double-wall bellows produced by its raw materials belong to the flexible pipe. Its properties are as follows:

Strong resistance to external pressure: the outer wall is a circular corrugated structure, which greatly enhances the ring stiffness of the pipe, thus enhancing the resistance of the pipe to soil load. In this aspect of performance, HDPE double-wall corrugated pipe has obvious advantages compared with other pipes. Low engineering cost: under the condition of such load, HDPE double-wall corrugated pipe only needs a thinner wall to meet the requirements. Therefore, compared with the solid wall tube of the same material specification, it can save about half of the raw materials, so the cost of HDPE double-wall corrugated pipe is also low. This is another very prominent feature of the pipe.

Convenient construction: Because of the light weight of HDPE double-wall corrugated pipe, handling and connection are very convenient, so the construction is fast and the maintenance is simple. Under the condition of tight construction period and poor construction conditions, its advantages are more obvious. Good low temperature resistance, impact resistance: the embrittlement temperature of HDPE double wall bellows is -70℃. General low temperature conditions (above -30℃) do not need to take special protective measures when construction, winter construction is convenient, and HDPE double-wall corrugated pipe has good impact resistance.

Good chemical stability: Because HDPE molecule has no polarity, it has excellent chemical stability. Except for a few strong oxidants, most chemical media can not destroy it. Soil, electricity, acid and base factors in general use environment will not damage the pipeline, no bacteria, no scaling, its circulation area will not decrease with the increase of running time.

Long service life:

Under the condition of no ultraviolet sunlight, HDPE double wall bellows can be used for more than 50 years. A certain length of HDPE double-wall corrugated pipe axial can be slightly flexural, is not affected by a certain degree of uneven settlement on the ground, can be directly laid in a slightly not straight groove and so on. Advantages:

1, unique structure, high strength, impact resistance compression, the wall is smooth, friction is too large flow; Communication convenience joint seal, no leakage.

2, light weight, fast construction speed, low operating costs, lower costs.

3, polyethylene hydrocarbon polymer molecules in extremely acidic and alkaline buried life for more than 5 years, and is green, non-toxic, non-corrosive, no scaling.

4, light weight, fast construction, reduce costs.

5, buried service life of more than 50 years.

Even if it’s a pair of twins, even if they’re very similar in every way, parents will recognize, in the case of these two double-walled bellows that are not twins, it’s a simple identification, and if we know enough about them, we can.