PE Underground Gas Pipe for Gas Transportation in Pakistan

The widespread use of PE gas pipeline construction technology represents the technological progress of the chemical industry on the one hand, and on the other hand reflects the great improvement in the social and economic benefits of the chemical industry.

1. Characteristics of PE gas pipe construction

The use of PE gas pipe depends largely on its construction characteristics. Perfect technical construction characteristics can bring the greatest economic and social benefits to enterprises and society. Among them, the construction characteristics of PE gas pipe (underground gas pipe) mainly include the following three aspects :

1.1 Low investment cost

PE gas pipeline technology has the characteristics of low investment cost, which is also one of the most attractive features for enterprises. The low investment cost of PE gas pipe mainly reflects two aspects. First, the material cost is low, which is much cheaper than ordinary steel pipes. Second, the construction cost is low. After the PE gas pipe (underground gas pipe) is installed, no subsequent construction costs are required, which saves construction costs.

1.2 Easy installation and maintenance

PE gas pipeline (underground gas pipe) has the advantages of light weight and high overall construction quality. In the specific construction process, the relevant construction personnel do not need to spend a lot of time and effort, and use large-scale equipment for installation, which can be completed with the simplest manpower. In addition, the PE gas pipeline (underground gas pipe) has high toughness, so it is not easy to be damaged during the specific operation process, which reduces the maintenance work of the construction personnel on the PE gas pipeline(underground gas pipe).

1.3 Long service life

For construction projects, in order to reduce investment costs, it is desirable to use equipment and materials that are not easily damaged and have a long service life. The PE gas pipeline (underground gas pipe) has this feature and has a long service life. PE gas pipe is a high molecular polymer of polyethylene, which has strong anti-corrosion performance. Therefore, after installation, PE gas pipeline can be used for up to 50 years without any special maintenance.

PE Underground Gas Pipe for Gas Transportation Production Factory

2. Application of PE gas pipeline construction technology

The application of PE gas pipeline (underground gas pipe) construction technology is mainly reflected in the specific construction process, including five aspects:

2.1 PE gas material inspection

PE gas pipelines need to undergo strict and authoritative quality inspections in order to be applied, and can only be installed and constructed after obtaining specific inspection reports. Therefore, the inspection of PE gas pipe is also very important, which is related to the quality and efficiency of the entire construction in the later stage. The specific inspection process includes material quality inspection, standard inspection, etc. As long as any place does not meet the standards, it cannot be put into production. PE Underground Gas Pipe for Gas Transportation

2.2 Trench excavation

In the specific construction process, the installation of PE gas pipelines (underground gas pipe) requires advance measurement and setting of excavation plans. There should not be any obstructing objects on the construction site, and there are strict requirements on the excavated sites. Geographic surveys are also required for qualified sites, and different construction plans are adopted for different geographical conditions. The whole trench excavation technology uses mechanical excavation and manual excavation, among which manual excavation is relatively complicated.

PE Underground Gas Pipe for Gas Transportation in Pakistan

2.3 PE pipe welding

At present, there are three main welding techniques for PE pipes on the market, namely: hot-melt welding, hot-melt butt joint and capacitor welding. Hot-melt welding is commonly used to weld pipes with relatively large diameters, using heating to heat the two ends and then quickly join them together to achieve welding; capacitor welding is based on the heating element of the key itself for heating and welding. Both have the advantages of simple operation and easy learning, but they have their own disadvantages. Hot melt welding has higher requirements for the site, while capacitor welding has higher costs. In actual application, the two methods are generally used in combination. Pipes with a diameter greater than or equal to 63mm are welded by hot fusion, and pipes with a diameter of less than 63mm are welded by electric fusion. PE Underground Gas Pipe for Gas Transportation

2.4 Pipe laying

Before the pipeline is laid, a large-scale and strict cleaning of the site is required. There must be no debris in the ditch, and a layer of medium-coarse sand with a thickness of not less than 0.1m should be laid. Finally, the construction site should be inspected, see PE Whether the laying of gas pipelines (underground gas pipe) meets the standards, once there is any place that does not meet the requirements, it needs to be adjusted in time to avoid problems in later projects, resulting in huge large economic loss.

2.5 Pipeline purging

After the pipeline laying is completed, the most important pipeline blowing work needs to be carried out. Pipeline purging is mainly based on compressed air, and the sundries in the gas pipeline are cleaned by compressed air. Of course, in the process of purging, it is also necessary to pay attention to the strength of the purging, which should not be too large or too small, usually controlled between 0.1MPa-0.3MPa, the purging temperature should not exceed 40°C, and the wind speed should not be lower than 20m /s, these requirements need to be paid attention to at all times, once one condition is ignored, it will have an adverse impact on the entire construction quality and efficiency. PE Underground Gas Pipe for Gas Transportation

2.6 Air tightness and strength test

According to the specific requirements for the construction and installation of PE gas pipelines (underground gas pipe), the installation of PE gas pipe needs to be tested for air tightness and strength pressure to see whether the quality and installation of the PE gas pipelines (underground gas pipe) meet the standards of the construction project. During the PE gas pipeline (underground gas pipe) pressure test, the pressure test value that needs to be used is about 1.5 times the design pressure, and the pressure should be stabilized for at least 1 hour. Observe the pressure change of the PE gas pipeline by observing the pressure gauge, and record it every hour. If the recorded data meets requirements, it can be put into final installation and use.

2.7 Pipeline Backfilling and Pavement Restoration

After the construction is completed, the excavated pipe trench needs to be backfilled. Firstly, fine sand should be backfilled so that it can be stacked to 15cm above the pipe, and then mixed sand and gravel of about 300mm in each layer should be backfilled. In order to prevent future damage, it is necessary to A warning tape is placed 500mm from the top of the pipe. After the sand and gravel is laid, use bricks to pave it and fill the joints with fine sand.