Lifetime Analysis
Plastic Pipes Conference Association # 2004 Milan
Sun, He, Zhang
Steel mesh reinforced plastic pipe is an innovative type of pressure pipe which is composed of plastics with a steel mesh encased. Due to the big differences in respective mechanical properties of the two materials, the stresses sustained by them also differ greatly when the pipe is subject to load. The methods available so far to determine the maximum operating pressure of such pipes are rather time-consuming and complicated as with those methods a great number of PDB or MRP tests have to be conducted on all sizes of pipes. This paper develops a new method for pressure design of steel mesh reinforced plastic pipe. Theoretical analysis demonstrates that when the pipe is subject to allowable load, the two materials have the same deformation (strain), so the ratio of the stresses sustained by the two materials can be determined according to Hooke’s law. Thus the maximum pressure rating of the pipe can be expressed as the weighted summation of the strength of plastic and that of steel mesh, which can be obtained by using traditional pressure rating calculation formula. Results of calculations and PDB tests carried out on Dn50mm pipe samples show that this method is more conservative in terms of safety. This method can also be extended to be used for pressure design of other structurally similar composite pipes.
Related papers
Author(s) : Hua Ye, Sun Jin, Wei Ruoqi
As a safe, clean, low-carbon and reliable energy source, nuclear power, together with hydropower and coal power, constitutes the three pillars of the world's energy supply and play an important role in the world's energy structure.With the strong support of national policies, China's nuclear energy has entered a new...
Author(s) : Yilaing He, Tianjun Zhang
A new electrofusion PE belt is developed by reinforcing it with various layers of steel mesh. It’s of sandwich structure, consisting of steel mesh reinforcement, heating wire and polyethylene. One or more layers of steel mesh is encapsulated in the middle, and heating wire is embedded onto “inner side” of the belt....
Author(s) : Dongyu Fang, Mark Yu, Zhang Qingfu
In the present paper we introduced how high modulus polypropylene helps an innovative design of utility tunnel up to 4000mm in diameter. High modulus polypropylene shows high modulus but still maintain reasonable flexibility so that tunnel and surrounding soil could form an integrated system, which means no force is...
Author(s) : Zhang Wei, Wei Ruoqi, Zhou Minghong, Zhou Mingwei,
This article gives a brief introduction of plastic inspection chambers in China. It focuses on the formulation of China's national standard for plastic inspection chambers and conducts the theoretical analysis and data validation of the key technical metrics in the standard for the following three tests: the...
Author(s) : Sun Qingjun, Liu Tongxi and Zhang Tianjun
A new composite PE pipe for pressure applications has been developed which combines the following features: polyethylene based, of structural wall, of multiple layers and steel reinforced. Another outstanding feature of this product is that large diameters up to dn2200-2600mm can be made and higher ring stiffness is...
Author(s) : Sun Jin, Hua Ye, Wei Ruo-qi
Nowadays large diameter HDPE pipes have been widely used in water supply, municipal gas, mines, nuclear service and other fields, while residual stress of large diameter thick-walled pipes in the extrusion processing have resulted in lots of engineering failure cases. In this paper residual stress and mechanical...
Author(s) : Zhang Wei, Wei Ruoqi, Zhou Minghong, Zhou Mingwei,
This article gives a brief introduction of plastic inspection chambers underground test, analyzes the stress borne by plastic inspection chambers from different angles combined with pressure sensors and strain gauges, sorts out some of the underground test data and analyzes the test data, and finally sums up the...
Author(s) : Qu Yunchun, Sun Xuhui, Chen Guokang
The polyethylene resin whose relative molecular mass distribution shows bimodal (Bimodal PE) possesses not only favorable mechanical property, but also excellent processing property. Currently, Borstar Technology of Borealis Company—loop slurry reactor and gas fluidized bed reactor install in series, which is...
Author(s) : Zhang Wei, Wei Ruoqi, Zhou Minghong, Zhou Mingwei, Lin Baoshu, Xiao Lingli
The plastic inspection chamber is one of the rapidly developing products in the field of drainage in China for the past few years. At present, plastic inspection chamber is mainly made of PP, PE, PVC and so on. The manufacturing technologies include injection molding, rotational molding, mechanical assembly and...
Author(s) : Zhang SiLiang, Zhang ShuangQuan, Guo XiaoLing, Ren YunHong, Wang MingKe
This article describes the effect of additive, light and high temperature on PE-X pipe’s performance. By additive amount changes, will be have different influence to pipe’s brittleness resistance, bending strength, and aging resistance. As cross-linking agent’s content increasing, bending strength enhanced, but...
Author(s) : Zhang Zhihao, Zheng Xiaoming
PE pipes have been used for many years in China. However, due to lack for engineering experience, some failure or leakages caused by PE pipe axial shrinkage have occurred in practice. In particular leaks were observed at or near the joints between metal and PE pipes. Suspecting that the cause of the leakage was the...
Author(s) : Zhang Li
Bases on the technical features of high-pressure glass fiber reinforced plastic pipes, steel frame PE complex pipes and flexible composite pipes, together with the application status of the above said pipes in oil field and related technical progress, this article will illustrate the existed questions, as well as our...
Author(s) : Li Yu-e, Wu Zhijun, Hua Ye, Sun Jiawen
As the polyethylene pipes widely used in the gas fields, their long-term life is demanded more and more strict. The technical requirement about carbon black particle size was defined in the revised ISO 4437 :2007 as one of requirements of material. We can see that carbon black particle size of the compound is an...
Author(s) : Chung, Oliphant, Vibien, Zhang
Disinfectants are commonly added to potable water to control bacteria, viruses, protozoa, algae and fungi which can potentially lead to waterborne diseases. The three most common disinfectants used for maintaining a disinfectant residual in North America are chlorine, chloramines and chlorine dioxide. While these...
Author(s) : Hsuan, Zhang, Wong
The 100-year stress crack resistance (SCR) of corrugated HDPE pipes was evaluated using a 600 mm diameter pipe. The SCR tests were performed on the finished pipe at the liner and junction locations. The notched constant ligament stress (NCLS) test (ASTM 2163) was used for the pipe liner assessment. For the pipe...
Author(s) : Vibien, Couch, Oliphant, Zhou, Zhang, Chudnovsky
The chlorine present in potable water as a disinfectant has been reported to reduce the lifetime of some plumbing system components. In this study the nature of the failure mechanism of a commercial cross-linked polyethylene (PEX) pipe material exposed in the laboratory to chlorinated potable water is examined. The...
Author(s) : Sun, Niu, J.Sun
Steel mesh reinforced plastic composite pipe, possessing advantages of both metal and plastics, is a new type pipe that made a perfect combination of steel wire mesh and thermoplastics. A general description of characteristics of pipe structure, production process, pipe performance analysis and model projects of...
Members of the Association
