: This is the most direct method. You can buy the manual directly from the AWWA Store or through authorized resellers like ANSI Webstore, NORM BASE, Accuris (formerly IHS), Intertek Inform, Standards.ie, and others.
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PE pipe can safely withstand recurring surge pressures (water hammer) up to 1.5 times its working pressure rating, and occasional surge pressures up to 2.0 times its rating. M55 outlines the step-by-step mathematical engineering required to calculate these fatigue limits. Installation and Joining Methodologies
Addresses both working pressure and transient pressures (water hammer). PE pipe's lower modulus of elasticity allows it to absorb surge pressures more effectively than rigid metallic pipes. Structural Design under Soil Loads : This is the most direct method
Changes in soil classification and descriptions (use of Uniform Soil Classes).
| Aspect | Legal (Purchase/Library) | Illegal "Free PDF" | |--------|--------------------------|---------------------| | | Secure | Malware risk (30%+ of such sites) | | Edition | Current (2020) | Often 2006 or incomplete | | Searchable text | Yes | Usually scanned images | | Updates | Free errata | None | | Legal risk | None | Copyright fines | | Professional use | Permitted | Ethics violation | Accuris (formerly IHS)
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