In this article, we are going to introduce you to the PE pipe fittings catalog. Have you ever thought about buying the PE pipe fittings catalog? Have you ever used the PE pipe fittings catalog? PE pipe fittings catalog is one of the things that attracts many customers today and there are many people who always value the quality of the PE pipe fittings catalog when shopping. The PE pipe fittings catalog has attracted many customers in various markets including online sites for nearly a year.
Eﬀect of Chemicals on HDPE
The tremendous chemical resistance of polyethylene to a variety of chemical reagents has made these systems widely used in a wide range of chemical processes. Likewise, pipes made of these materials also have certain advantages and properties due to the chemical resistance of the constituents.
Chemical resistance of polyethylene pipe to the specific materials in the environment and to the material in the fluid that is transmitted by the pipe (depending on the use of the pipe), considering environmental conditions, such as temperature and pressure, are important criteria to consider when selecting Special attention should be paid to the type of pipe required during the design phase. For example, in the chlorine-containing potable water conveyor system, compounds of polyethylene resin, which contain additives that are resistant to the oxidation effect of chlorine-based disinfectants, are used. In this article, we will talk about the chemical resistance of polyethylene pipes that will help you in choosing the right polyethylene pipe for your system.
The degree of resistance of polyethylene pipes to different types of chemicals can be obtained by various immersion tests. In order to obtain near-realistic results, it is advisable to test the material under different conditions (in terms of temperature and pressure) as well as the different concentrations of chemical agents exposed.
Typically, large manufacturers for their production of PE pipes provide guidelines and guidelines on the amount of chemical resistance to a variety of materials under different conditions that the designer can refer to select the type of pipe required. It should be noted, however, that the chemical resistances listed in these tables and instructions should only be used as preliminary information for selecting the type of polyethylene pipe required and do not include specific system design considerations. In addition, the system designer should carefully consider the test environment conditions, which are included in the instructions, and compare it with the environmental conditions in which the system is to be implemented.
How do you joint a HDPE pipe?
Butt welding joints are used in water and wastewater systems and their distribution network, fire extinguishing at various pressures. This type of welding is the best method of bonding in PE pipe and joints if done correctly. In welding joints, the quality and efficiency of the welding depend on the skill and ability of the welder, the suitability and efficiency of the welding machine and related equipment, and compliance with the principles and rules of welding.
Connecting polyethylene pipes using cross-welding or butt-welding is a thermophysical process. This method involves continuous heating of the contact surface of the two PE pipes until they are permanently bonded together. These two parts are heated until they are well melted. These melted parts are then merged to form a pipe at the junction so that the flow can flow well. These two levels are controlled together under pressure and cool for a certain period of time. The uniform and ideal welding of these two tubes occur side by side after the cooling step. The connection is resistant to pressure and has no pores. This section will have the same operating pressure as other parts of the pipe. Another method for connecting polyethylene pipes is the use of electro-fusion technology.
Electrofusion welding systems are nowadays regarded as one of the most advanced, cost-effective and safe methods for connecting PE pipes. In this method, electricity is used to crush the walls of polyethylene pipes at their joints and to create a perfectly homogeneous cross-sectional area. The heat generated by this electric current completes the welding process and creates a very strong connection that is even stronger than the tube itself. This method is flexible. This means that the electroporation method can adjust the amount of heat according to the type of polyethylene material used in the pipe as well as its thickness. It also has the capability to adapt the flow required to melt pipes with varying degrees of raw material density. Another key benefit of this method is that it can also be used for installations or parts of the pipeline that are difficult to access. For this purpose, the oxidized layer on the pipe is removed at the junction and the junction of the pipes is thoroughly cleaned of any contamination. Then the fusion process begins.
Can HDPE pipe be used for hot water?
It is widely reported around the world that HDPE (High-Density Polyethylene Tubes) is one of the best safe plastics to use for food storage and water transfer, and there is no evidence of widespread health problems. No use has been found in the use of HDPE in food, drink and drinking applications. It can also be said that due to the complexity of the types of contaminants present when observing and reporting water contamination, by modifying the formulations for polymer tube manufacturing and the different planning conditions, the chemical risks of the reactions in the pipes are minimized. It should be noted that there are pros and cons to choosing any materials for drinking water piping, but recent research shows that the risk of chemical contamination of copper pipes is lower than that of polyethylene pipes. The cost of using it is very high and not cost-effective.
On the other hand, PE reduces costs, is resistant to change in current, and reduces disruption and leakage. Polyethylene pipes also offer easy installation and use advantages and environmental advantages over copper. Anyone using HDPE pipes for drinking water is eligible for use if they have passed the ANSI 16 / NSF 14 certification. The polyethylene pipe seller must guarantee the pipes in terms of chemical changes, odor and taste changes as well as good performance against high temperatures.
What are the disadvantages of polyethylene?
The disadvantages of polyethylene pipes should be carefully and cautiously investigated, the advantages of polyethylene pipes are so great that they are difficult to get into, but if and when faced. Have you ever seen a producer of polyethylene pipes tell about the disadvantages of polyethylene pipes and publish them on their site? The purpose of this work is to enlighten designers and interested people. The general and engineering properties of polyethylene pipes can be controlled by standards and on the other hand, in many applications due to the overlap of properties between different polymers, there can be several choices. Therefore, it is necessary to fully understand the position of the user and to master the different properties of the various types of plastic pipes. Polyethylene pipes should be used properly and for proper use so that these pipes have the best efficiency and have a useful life. Disadvantages of PE can be called weaknesses because by examining these, there is a sustainable and rational solution for each of them.
One of the first disadvantages (weaknesses) of polyethylene pipes arises when shipping is not performed in accordance with the instructions and the outer body of the pipe is subject to deep scratches and has been seen to project multiple polyethylene pipes to a tractor at project sites. Or any other machine, sliding on dirt and asphalt, causing scratches on the outer body of the pipe. The pressure tolerance in single-wall polyethylene pipes is based on the amount of pipe thickness, and if scratches occur within a few millimeters, the pressure tolerance at that point will be less than the standard defined. We suggest you read the shipping guide. The vulnerability of polyethylene pipes to UV rays goes back to the early days of using polyethylene pipes, now used to eliminate this weakness of polyethylene black materials and also if white and non-white materials are used to produce polyethylene pipes, For tube reinforcement and blackening of the pipe, special masterbatches containing anti-UV materials are used. The life of a PE is a relation between the applied internal pressure and the fluid temperature, the life of the PE is 100 years predicted and determined, assuming that the fluid temperature is 20 ° C and the ambient temperature has a very low impact, and the PE They are very hot to very cold at ambient temperatures and do not cause any problems.
At what temperature does HDPE melt?
Polyethylenes are a family of thermoplastics that are obtained by the polymerization of ethylene gas. This polymerization is performed under high pressure and temperature in the presence of metal catalysts. Under these conditions, ethylene molecules are converted into chains of 50 to 50,000 units, and ethylene gas is transformed into a white crystalline solid. Polyethylene contains a very simple structure, making it simpler than all commercial polymers.
A polyethylene molecule is a long chain of carbon atoms with two hydrogen atoms attached to each carbon atom. Polyethylene, which has a small number of side chains and is short in length, is called heavy polyethylene (linear polyethylene). The usual fluctuations and fluctuations in the installation temperature and performance of the ductile iron pipe have no effect on their strength. At the service temperature of the breaker tube no appreciable change, even at temperatures above 60 ° C, occurs in the tensile strength, but due to the polymeric and thermoplastic nature of the PE pipe, its performance strongly depends on the service temperature and its function.
Since the thermal expansion coefficient of polyethylene is 18 times that of unbreakable cast iron, it is likely that it will undergo global displacement during exposure to severe temperature changes. Fig. 3 shows that at 43 ° C (110 ° F) the tensile strength of heavy PE is approximately 70% of its strength at 23 ° C (73.4 ° F). This decrease in hardness reaches 50% at 60 ° C (140 ° F). Polyethylene pipes have been used for nearly half a century due to their inability to leak, rot, easy installation and resistance to soil movement and pressure. On the other hand, as polyethylene is a viscoelastic material and, like all thermoplastics, exhibits creep behavior, it deforms over time. Such phenomena occur even at normal temperatures and relatively low pressures, and like other plastics, the mechanical properties of PE depend on three parameters: time, heat, and pressure. Therefore, in calculations for pipe design, mechanical properties are always determined by long-term tests and are necessarily divided into a factor called a safety factor.
Is HDPE safe to melt?
Butt fusion welding techniques will be taught in this article, although butt welding for PEs is very simple and fast compared to welding metal pipes. For this reason, proper welding training and compliance with its requirements are of utmost importance. The PE pipe welding machine must be entrusted to the person who fully understands the method and instructions for use of the machine, secondly, to understand the pipe preparation and eye inspection requirements, and thirdly to follow the instructions for butt welding. The PE welding guide tries to provide important tips regarding welding eye inspection and the appearance of the weld. In addition, a full description of the welding machine operation is provided and specific operating and safety recommendations are provided. As the use of twin polyethylene materials such as PE80 and PE100 increases, more and more blends of polyethylene is introduced into the pipe market, along with suggestions for butt-welding methods, which often differ even for identical materials. You can read more about melt plastic and Eﬀect of Chemicals on HDPE and HDPE melts on other posts.
Therefore, the current experience on a global scale needs to be reviewed and the best method (s) to develop the most quality, reliable and effective polyethylene butt welding systems for gas and water supply systems. Due to the long-term experience of “low-pressure single pressure welding” and manufacturing of welding machines accordingly in Iran, it is recommended to use this method. The production of a strong bond depends on the welding range of the melted polyethylene products. Excessive heat may degrade the quality of the raw material and low heat cannot optimally soften the polyethylene material to achieve good and high-quality welding.