PE给水管你必须了解的知识

　　PE给水管作为市政工程常用的管材，常常需要寻找合适的厂家去购买符合工程要求的管材，询问厂家的时候往往需要提供具体的参数要求，PE给水管的常用知识很多人都不懂，这里润硕管业给大家整理一份PE给水管常用小知识大全：

PE按树脂的密度可分为哪几类？

　　答：PE按树脂的密度可分为：

　　低密度聚乙烯　　LDPE　　（0.9～0.93g/cm3）由乙烯单体的均聚物组成；

　　中密度聚乙烯　　MDPE　　（0.93～0.94 g/cm3）由乙烯与α-烯烃共聚组成；

　　高密度聚乙烯　　HDPE　　（0.94～0.965 g/cm3）由乙烯与少量丙烯、丁烯、己烯单体共聚组成。

PE按长期静液压强度可分为哪几类？

　　答：可分为PE32、PE40、PE63、PE80、PE100，在给水中使用最多的是PE80和PE100。

润硕PE100给水管

按强度分级是如何得来的？

　　答：ISO9080中规定在20℃时的长期静液压强度实验中，确定材料的最小要求的静液压强度MRS，将其乘以10，可得材料的等级。MRS是指在20℃、50年时间的条件下，材料最小要求静液压强度。

PE63\ PE80\PE100区别在哪里?63,80,100分别指什么?建筑给排水上一般选用哪种规格？

　　答：材料等级 MRS(50年，20℃)MPa

　　　PE100　10MPa

　　　PE80　　8MPa

　　　PE63　　6.3MPa

　　所谓MRS是指连续施加在该聚乙烯树脂制管管壁上50年时引起管材破坏时所计算的在管壁上的环向张应力（经过圆整）。

　　　PE63 本系列管材一般用于城镇及乡村给水工程；公称压力是指管材在20℃下输送水的最大允许工作压力。　　

　　　PE80 本系列管材主要用于城市给水工程；公称压力是指管材在20℃下输送水的最大允许工作压力。

　　　PE100 本系列管材特别适用大口径、高压力给水工程；公称压力是指管材在20℃下输送水的最大允许工作压力。

　　　PE80 PE100燃气也可以用。

　　不同等级原料生产的PE给水管材标准尺寸比与公称压力的对应关系如下：

PE给水管压力表

对PE影响较大的基本参数有哪几个？

　　答：对PE影响较大的基本参数有分子量、分子量分布、结晶度。分子量以熔体流动速率MFR表征。

　　分子量分布描述了聚合物分子链的长度及质量，如果所有的链都比较接近，就称为分布窄，反之称分布宽，以熔流比表征。 结晶度以密度表征。

密度对PE管有什么影响？

　　答：密度低，韧脆转化的“拐点”出现的晚，也就是说密度高韧脆性差。

分子量对PE有什么影响？

　　答：分子量大，PE抗冲击性能好，提高PE分子量是提高PE管长期强度和耐应力开裂性能的有效手段。

　　以上问题是我么你所必须了解的关于PE管材的基础知识，如果想了解更多的知识请关注润硕管业。

PE water supply pipes are commonly used pipes in municipal engineering. It is often necessary to find suitable manufacturers to purchase pipes that meet the engineering requirements. When asking manufacturers, they often need to provide specific parameter requirements. Many people do not understand the common knowledge of PE water supply pipes. Shuo Pipe Industry Co., Ltd. will organize a list of common small knowledge of PE water supply pipes for everyone:

PE can be divided into several types according to the density of the resin?

　　 Answer: PE can be divided into:

　　 low density polyethylene　　LDPE　　(0.9～0.93g/cm3) is composed of homopolymer of ethylene monomer;

　　Medium density polyethylene　　MDPE　　(0.93～0.94 g/cm3) is composed of copolymerization of ethylene and α-olefin;

　　HDPE　　(0.94～0.965 g/cm3) is composed of copolymerization of ethylene and a small amount of propylene, butene, and hexene monomers.

PE can be divided into several categories according to long-term hydrostatic strength?

　　 Answer: It can be divided into PE32, PE40, PE63, PE80, PE100, and PE80 and PE100 are the most used in water supply.

Runshuo PE100 water supply pipe

How is the intensity rating obtained?

　　 Answer: According to ISO9080, in the long-term hydrostatic strength test at 20℃, determine the minimum required hydrostatic strength MRS of the material, and multiply it by 10 to get the grade of the material. MRS refers to the minimum required hydrostatic strength of the material under the conditions of 20°C and 50 years.

What is the difference between PE63\ PE80\PE100? What do 63, 80, and 100 refer to? Which specifications are generally used for building water supply and drainage?

　　Answer: Material grade  MRS (50 years, 20℃) MPa

　　　PE100　10MPa

　　　PE80　　8MPa

　　　PE63　　6.3MPa

　　 The so-called MRS refers to the circumferential tensile stress (rounded) on the pipe wall calculated when the polyethylene resin pipe wall is continuously applied to the pipe wall for 50 years to cause the pipe to break.

　　　PE63 This series of pipes are generally used in urban and rural water supply projects; the nominal pressure refers to the maximum allowable working pressure of the pipes to transport water at 20°C.　　

　　　PE80 This series of pipes are mainly used in urban water supply projects; the nominal pressure refers to the maximum allowable working pressure of the pipes to transport water at 20°C.

　　　PE100 This series of pipes is especially suitable for large-caliber, high-pressure water supply projects; the nominal pressure refers to the maximum allowable working pressure of the pipe to transport water at 20°C.

　　　PE80 PE100 gas can also be used.

　　The corresponding relationship between the standard size ratio of PE water supply pipes produced from different grades of raw materials and the nominal pressure is as follows:

PE water supply pipe pressure gauge

What are the basic parameters that have a greater impact on PE?

　　Answer: The basic parameters that have a greater impact on PE are molecular weight, molecular weight distribution, and crystallinity. Molecular weight is characterized by melt flow rate MFR.

　　 Molecular weight distribution describes the length and mass of polymer molecular chains. If all the chains are relatively close, it is called narrow distribution. Conversely, it is called wide distribution, which is characterized by melt flow ratio. The degree of crystallinity is characterized by density.

What effect does density have on PE pipes?

　　Answer: With low density, the "inflection point" of the transition from toughness to brittleness appears late, which means that the density is high and the toughness and brittleness are poor.

What effect does molecular weight have on PE?

　　Answer: The molecular weight is large, and PE has good impact resistance. Increasing the molecular weight of PE is an effective means to improve the long-term strength and stress crack resistance of PE pipes.

　　The above questions are the basic knowledge about PE pipes that you must know. If you want to know more, please pay attention to Runshuo Pipe Industry.