HDPE pipe and fitting,PVC pipe and fitting

With the acceleration of urbanization and the adjustment of energy structure, the construction of gas transportation pipelines has ushered in a period of rapid development. Among the many pipe options, high-density polyethylene (HDPE) pipes have become one of the preferred materials in the field of gas transportation due to their excellent performance. HDPE pipes have significant advantages such as corrosion resistance, light weight, convenient construction, and long service life, and have gradually replaced the application of traditional metal pipes in gas transportation.

However, as a high-risk field, gas transportation has extremely strict requirements on the performance and quality of pipes. To this end, domestic and foreign standardization organizations have formulated a series of standard specifications specifically for HDPE pipes for gas transportation. These standards not only stipulate the basic performance indicators of pipes, but also put forward comprehensive requirements for raw materials, production processes, testing methods and application conditions. In-depth understanding of these standards and specifications is of great significance to ensure the safety of gas transportation and promote the rational application of HDPE pipes.

 

Advantages of HDPE pipes in gas transportation

HDPE pipes have multiple significant advantages in the field of gas transportation, which make them an ideal alternative to traditional metal pipes. First, HDPE pipes have excellent corrosion resistance and can resist erosion by various chemicals in the soil. They will not suffer from electrochemical corrosion like metal pipes, which greatly extends the service life of the pipes. Secondly, HDPE materials have excellent flexibility and impact resistance, can adapt to geological changes such as foundation settlement and earthquakes, and reduce the risk of pipeline rupture.

In addition, HDPE pipes are light in weight, easy to transport and install, and can be seamlessly connected using hot-melt connection technology, greatly reducing the difficulty and cost of construction. The inner wall of HDPE pipes is smooth, the friction coefficient is small, and the transmission capacity is about 30% higher than that of metal pipes of the same caliber, which can significantly reduce the energy consumption of gas transportation. Most importantly, the design service life of HDPE pipes can usually reach more than 50 years, which is much higher than traditional pipes and has significant economic benefits.

 

Domestic and foreign standard system for HDPE pipes for gas transportation

The main international standards for HDPE pipes for gas transportation include ISO 4437 "Plastic Pipe Systems for Gas Transportation - Polyethylene" and EN 1555 "Plastic Pipe Systems for Gas Transportation - Polyethylene" series of standards. ISO standards are international general standards, while EN standards are widely used in Europe. These international standards have detailed provisions on the material properties, dimensional requirements, physical and mechanical properties, chemical resistance and other aspects of HDPE gas pipes.

The standard system for HDPE pipes for gas in my country is mainly based on the GB 15558 "Buried Polyethylene (PE) Pipeline System for Gas" series of standards. The standard is divided into three parts: the first part is pipes, the second part is pipe fittings, and the third part is valves. In the process of formulating the GB 15558 standard, international advanced standards were referred to, and at the same time, combined with my country"s actual situation, the technical requirements, test methods, inspection rules, etc. of HDPE gas pipes were comprehensively stipulated. Compared with foreign standards, my country"s standards have stricter requirements on certain performance indicators, such as adding specific requirements for carbon black dispersion.

 

Key performance indicators of HDPE pipes for gas transmission

HDPE pipes for gas transmission must meet a series of key performance indicators to ensure safe and reliable operation. The first is the material performance requirements, including the performance of the base resin and the use of additives. The base resin must be a dedicated PE100 or PE80 grade with an appropriate melt flow rate and molecular weight distribution. The additive system must contain sufficient antioxidants, UV stabilizers and carbon black, of which the carbon black content is usually required to be between 2.0% and 2.5%, and the dispersion must meet specific standards.

In terms of mechanical properties, HDPE gas pipes must have sufficient long-term hydrostatic strength, usually requiring a 165-hour hydrostatic test and a 1000-hour slow crack growth test. Environmental stress cracking resistance (ESCR) is another key indicator, usually requiring a notched dead load tensile test of not less than 500 hours. In addition, the pipe must have good fluid transportation performance, including low gas permeability and a flow resistance coefficient that meets the requirements.

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