AWWA M55 PDF

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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The values in the awa are obtained from initial average deflections. It is this value that is used to determine the pressure capability of a pipe under specified service conditions.

Beyond the transition zone is the zone of complete turbulence in which relative pipe roughness dD is essentially independent of the Reynolds number. Trivia About Pe Pipe Design Additionally, fittings used within the system should possess sufficient pull-out resistance in light of anticipated move- ment caused aswa thermal expansion or contraction. When heat fusion joining, it is essential that the heat fusion joining procedures used are qualified by making heat fusion joints with the procedures, and then con- ducting tests on the joints to demonstrate joint integrity.

Railroad companies normally require encasement of pressure pipes installed under mainline track crossings. The pipe has been installed so that stress generated by pipe deformation and sec- ondary loads are limited by a.

The pressure of the molten PE at the end of the extruder barrel before it enters the die can range from 1, to 5, psi. The first two lengths are joined and aswa through the machine so that a third length can be joined to the second, and so forth.

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This process is similar to extrusion in that the major operational steps are the same: Throughout the length of the screw, the temperature of the plastic is closely moni- tored and controlled.

Butt fusion equipment ranges from manual units to hydrauli- cally assisted, semiautomatic machines for pipes up to 65 in. Readers will also find the manual a useful source of information for assis- tance with specific or unusual conditions.

Pe Pipe Design And Installation (M55) by AWWA Staff

Plastic Pipes for Water 4. Swwa intent of the latter is to ensure that the incoming material type is qualified for pipe and fitting manufacture.

The working pressure rating WPR accounts for all of these factors. Joining strings is also called tie-injoining.

Pe Pipe Design And Installation (M55) (Awwa Manual)

Using a depth gauge to fit a cold ring clamp to the pipe at the correct inser- tion depth. Common additives used in PE pipe compounds include thermal processing stabilizers, long-term antioxidants, ultraviolet inhibitors, or screens.

All fittings also adwa periodically checked for proper dimensions and tolerances. The effect of both the Reynolds num- ber and the roughness of the pipe wall on the friction factor in this region has been defined based on extensive experimental data.

Pipe standards for PE pressure pipe do not require postinstallation deflection inspection.

It is also typical that tensile strength at yield and tensile strength at break are similar values; that is, once the material yields, the load required to continue specimen elon- gation and eventually break the specimen changes very little. Setup time is minimized when pipe lengths are fed through the machine and joined into long strings. If the weight-center of the load is farther out on the forks, lifting capacity is reduced. Lifting and handling equipment having suf’ficient capacity for the weight and size of the coil is required.

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Molecular Weight PE resins are composed of a number of molecular chains of varying lengths. For this reason, special care should be taken when installing potable water lines through contaminated soils regardless of the type of pipe material concrete, plastic, ductile iron, etc.

These flaws, whether microscopic or macroscopic in nature, act to intensify any nominal stress applied within the localized region. Allowances for surge events are pre- sented in the Surge Considerations section. As noted, these additives are generally FDA approved and their suitabil- ity of use in potable water applications is determined in accordance with third party standards developed by a consortium that includes NSF International, American Water Works Association, Awwa Research Foundation, and other groups.

The pipe manufacturer should be consulted for this information. It is only a function of the Reynolds number: Calculate the WPR for an 8-in.