First of all, to clarify a problem, here PE100 and PE80 refer to PE raw material grade, not pipe diameter.
PE100 is a grade 100 polyethylene raw material, and PE80 is a grade 80 polyethylene raw material.
PE raw materials are divided into five grades according to international standards: PE32, PE40, PE63, PE80
and PE100, and PE80 and PE100 are mainly used for water supply pipelines. The MRS Of the PE80 reaches
8Mpa and the MRS Of the PE100 reaches 10Mpa. In other words, when polyethylene is applied to 50 years at
a long-term hydrostatic strength of 20 ° C, the annular stress value of the material is PE80 at 8.0-9.99MPa and
PE100 at 1.0-12.49MPa.
(MSR is the reduction of the Minimum Required Strength, which refers to the strength of the pipe under circumferential tensile stress)
Let's analyze the difference between PE80 and PE100:
First, the difference of raw materials
PE80 refers to 80 grade polyethylene raw materials, 100 is 100 grade polyethylene raw materials. The corresponding pressure capacity of grade 100 is better than that of grade 80, which is made into a PE water supply pipe, and the maximum pressure of grade 80 is 1.25mpa and that of grade 100 is 1.6mpa. The density of grade 80 is lower than that of grade 100, so grade 80 is also called medium density polyethylene (MDPE), and grade 100 is called high density polyethylene (HDPE).
Second, the difference in performance
1. Tensile properties: the tensile yield strength of PE100 is 20% higher than that of PE80;
2, impact resistance: PE100 impact resistance is higher than PE80;
3. Bending performance: the bending modulus of PE100 is 20% higher than that of PE80;
4, pressure capacity: the pressure capacity of PE100 is higher than that of PE80;
5. Fast and slow crack growth resistance: PE100 is higher than PE80.
Third, the difference of construction costs
Under the same use pressure, PE100 pipe is thinner and lighter than PE80 pipe, reducing engineering costs and construction costs. PE80 and PE100 pipe comprehensive performance comparison:
|Material consumption||Large material consumption||Low material consumption|
|Material cost||High material cost||Low material cost|
|Construction convenience||Large quality, inconvenient construction||Small quality, easy to construct|
|Pipeline flow||The tube wall is thick, the circulation section area is small, and the circulation flux is small||The pipe wall is thin, the circulation section area is large, and the circulation flux is large|
|Resistance to external damage||External force is easy to scratch, but the pipe wall is thick, and minor scratches do not affect the use||External force is not easy to scratch, but the pipe wall is thin, and minor scratches may lead to excessive scratch depth, resulting in pipe scrap|
Through the comparative analysis of PE100 and PE80, it is a trend to replace PE80 with PE100 material. As the prices of the two raw materials are close to each other, with the increasing use of PE100 material, even the materials of small-diameter pipes can be replaced with PE100.
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