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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Water hammer can be caused by rapid opening or closing of valves and hydrants, start-up or shut-down of pumps, sudden loss of power, or any other situation that causes a sudden change in velocity of the fluid stream. Extensive research conducted on gas pipe indicates that modern PE resins designed for pressure piping applications are extremely resistant to slow crack growthlg.

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

Examples are sweep zyxw elbows, swaged reducers, and forged stub ends. When using a forklift or forklift attachments on equipment such as articulated loaders or bucket loaders, lifting capacity must be adequate at the load center on the forks.

For adequate knowledge of these products, the entire manual needs to be studied. Modern PE materials formulated specifically for pressure pipe applica- tions are designed to resist the initiation of this slow crack growth phenomena even when subjected to millions of cycles of pressure transients.

At some point, this intensified stress at the flaw will exceed the strength of the material and a small crack may develop. The value of E’ increases with increasing depth of cover. It is widely used in Europe and its content exclusively covers the methodology for calculations of all kinds of pipes. Unlike conventional socket fusion fittings, electrofusion fittings are clamped or otherwise affixed to the pipe before heat energy is applied.

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Water Standards | AWWA HDPE Standards & Manuals | ASTM HDPE Piping Standards | NSF Standards

Assume 2 percent ovality. For purposes of product selection and design, the following surge definitions are applied: Roberto Sandoval vasquez marked it as to-read Feb 06, Zurikisantimayo marked it as to-read Nov 07, The data logging device can also be used as a training aide for opera- tors.

The surcharge load is the sum of the four subarea loads at the subsurface point. To obtain a listing in this document, resin manufacturers are required to submit stress-rupture data developed in accor- dance with PPI TR Thermal fusion is also the basis for the butt- socket- and electro-fusion pro- cesses, which are used for the joining of PE fittings to pipe. These flaws, whether microscopic or macroscopic in nature, act to intensify any nominal stress applied within the localized region.

It is important not to use melt index alone as a definitive indicator of molecular weight because variations in polymer structure can affect both molecular weight and melt index.

The effective modulus of elasticity is significantly reduced by the duration of the loading because of the creep and stress relaxation characteristics of PE. For applica- tions where the pressure is constant and below the pipe pressure rating, this small amount of expansion strain is not important and is not considered a design variable. In this mode, pipe failure is characterized by very small slit-type failures in the pipe wall that initiate at points of mechanical stress concentration associated with inhomogeneities in the pipe wall or at imperfections on the inner pipe surface.

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Because of the combined strain, deflection lim- its for pressurized pipe are related to the pipe’s dimension ratio DR.

Only wide web slings should be used. The value at 1.

When vacuum can occur in the pipe, it is usually prudent to check whether the pipe can withstand the vacuum, Pv, without soil support if the depth is shallower than anticipated or pipe is uncovered. Plastic Pipes for Water 4. These studies have revealed that insects or microorganisms pose no threat of damage or degradation to PE pipe.

The typical tolerance for PE aww wall thickness is plus 12 percent, so the accepted practice is to assume that the average wall t, is 6 percent thicker than the specified minimum t.

Pe Pipe Design And Installation (M55) by AWWA Staff

Miguel rated it it was amazing Dec 06, Higher freight costs will apply to loads that exceed length, height, or width restrictions. State zyxwv transportation restrictions on length, height, and width usually govern allowable load configurations. However, as temperature increases, the viscoelastic nature of the polymer yields a lower modulus of elasticity, lower tensile strength, and lower stiffness. Julio Santos marked it as to-read Jun 18,