Features of double wall bellows
High density polyethylene (HDPE) has excellent chemical stability, resistance to aging and resistance to environmental stress cracking.The HDPE double wall bellows produced by the raw materials belong to the flexible pipe.Its performance is as follows:
Strong resistance to external pressure:
The outer wall is in annular corrugated structure, which greatly enhances the ring stiffness of the pipe and thus enhances the resistance of the pipe to soil load. In this aspect, HDP giant double-wall corrugated pipe has obvious advantages compared with other pipes.
Low project cost:
Under the condition of equal load, HDPE double wall bellows only need a thinner wall can meet the requirements.Therefore, compared with the solid wall phase tube of the same material specifications, it can save about half of the raw materials, so the cost of HDPE double-wall bellows is also lower.This is another very prominent feature of the pipe.
Convenient construction:
Due to the light weight of HDPE double wall bellows, handling and connection are very convenient, so the construction is quick and maintenance is simple.The construction period is tight and construction
In the case of poor conditions, its advantage is more obvious.
Small friction coefficient, large flow:
HDPE double wall bellows with HDPE as the material can pass through a larger flow rate than other pipe materials of phase diameter.In other words, the same flow requirements, can be used relatively small caliber HDPE double wall bellows.
Low temperature resistance and impact resistance:
The embrittlement temperature of HDPE double wall bellows is -70℃.General low temperature conditions (-30℃ above) construction without special protective measures, winter construction is convenient, and HDPE double wall bellows have good impact resistance.
Good chemical stability:
Because cement pipe material is steel pipe, to ensure bearing plug effect, trench bottom must deal with level off, had better make foundation layer, and ask construction personnel to have absolute sense of responsibility.HDPE double wall bellows for flexible pipe, the bottom of the ditch is not high requirements.
HDPE pipe does not fracture to ground subsidence or crustal change
The elongation of HDPE pipe is more than 20 times that of steel pipe and six and a half times that of PVC. Its elongation at break is very high and its elongation is very strong.This means that HDPE tubes are able to deform without breaking in the event of earth subsidence or seismic shifts in the crust.This point is far better than steel pipe, also better than the obvious brittle PVC pipe.This performance has been proved at home and abroad (Hanshin earthquake did not cause pipe fracture;HDPE pipe in Zhinan Baoshan earthquake was not damaged are proof)
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