AWWA M PE Pipe – Design and Installation. Document Language: English; Published By: American Water Works Association (AWWA); Page Count: PE Pipe – Design and Installation MANUAL OF WATER SUPPLY PRACTICES M55, First Edition AWWA MANUAL M55 First Edition American Water Works. AWWA M55 is not a standard, but rather a design manual according to the recommendations of the American Water Works Association (AWWA) covering all .
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Melt expansion at the interface also creates the pressure required to mix and fuse the materials together.
Pe Pipe Design And Installation (M55) (Awwa Manual)
The load and pipe reaction calculations may not qwwa to pipes installed by trenchless technologies, such as pipe bursting and directional drilling. Fracture Mechanics Fracture mechanics refers to the study of crack growth originating from flaws that may exist within a material or structure. As such, these charts provide a relative indication of the suitability of PE when exposed.
OxPC Eq Where: Electrofusion joining is accomplished by application of elec- trical energy to a awwz coil or other electrically conductive material that is an integral part of the fitting. According to this practice, the average inside pipe diameter Di of pipe that is made to a standard outside diameter Do is as follows: These free radicals are then available to react with other molecules within the polymer, and the result can be a significant reduction in physical properties.
zwwa It is a discussion of recommended practice, not an American Water Works Association AWWA standard calling for compliance with cer- tain specifications. This suggests that unrestrained PE will expand or contract con- siderably in response to thermal fluctuation.
To protect PE against thermal and oxidative degradation during fabrication and ensure a long shelf and service life, PE is always compounded awa a small amount of additives. In this way, U V degradation is prevented, and the physical properties of the polymer are retained even after substantially long periods of exposure to the ele- ments. This chapter is limited to loading on pipes buried in trenches.
Ranges of performance for each of these properties are defined within this standard as well. However, unlike tensile loading, which can result in a failure, compression produces a slow and infinite yielding that seldom leads to a failure.
Table influence coefficient terms depicted in Figure are defined as: For adequate knowledge of these products, the entire manual needs to be studied.
Using a depth gauge to fit a cold ring clamp to the pipe at the correct inser- tion depth. Joining methods that do not provide restraint against pullout are not acceptable for use in PE pressure piping systems. The first of these is an initial linear deformation in response to the load imposed that is generally recoverable when the load is removed.
The commercial carrier and manufacturer should be advised immediately of any damage or discrepancies. Howardg for the Bureau of Reclamation. The ATV methodology is much more detailed regarding trench-pipe interaction and does a deeper analysis about the intervention of each of the variables.
The methodology basis used in this manual is the most used, almost exclusively, in the Americas. General requirements are for the area to be of sufficient size to accommodate piping components, to allow room for handling equipment to get around them, and to have a relatively smooth, level surface free of stones, debris, or other material that could damage pipe or components, or interfere with handling.
Occasional surge pressures are often the result of a malfunction, such as a power failure or system com- ponent failure, including pump seize-up, valve-stem failure, and pressure-relief valve- failure.
– ATV A Standard vs. AWWA M55 manual
The stress required to ultimately break the test adwa is called the ultimate tensile strength or the tensile strength at break. A commonly used formula is as follows: The fracture resistance of a given structure or material will depend on the level of stress applied to it, the presence and size of any flaws in it, and the inherent resis- tance of the material to crack initiation and growth. The j55 of the material QC tests is to determine that the materials comply with AWWA requirements and that the material properties also match the incoming certificate of analysis from the resin manufacturer.
Setup time is minimized when pipe lengths are fed through the machine and joined into long strings. If the pipeline has a high point above that of either end, vacuum venting may be required to prevent vac- uum collapse, siphoning, or to allow drainage.
Electrofusion joining is accomplished by applying electrical energy to the heating element through a control box.
Do – t Do average outside diameter of the pipe, in. This load is referred to as the prism load and is given in Eq as vertical earth pressure acting on the horizontal surface at the pipe crown. The manual contains a list of applicable national standards, which may be purchased from the respective standards organiza- tions e. The first two lengths are joined and pulled through the machine so that a third length can be joined to the second, and so forth.
It is considered inert in that it will neither support nor deter the growth or propagation of micro- or macro-organisms. IPS coiled pipes has been used during pipe installation. The truck should be on level ground with the parking brake set and the wheels chocked. The variability in the actual percentage of carbon black incorporated can have a moderate affect on com- parative density values.
Extremely sharp razor notches are cut across the speci- men to a specified depth of the specimen thickness. The failure should be ductile and above a certain pressure threshold depending on material and pipe dimensions. For estimating purposes, Table presents the approximate number of field joints for a typical construction day.
Safe handling and operating procedures must be observed.