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By American Water Works Association.; American National Standards Institute
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Extra info for AWWA standard [for] installation of steel water pipe--4 in. (100mm) and larger
Copyright American Water Works Association Provided by IHS under license with AWWA No reproduction or networking permitted without license from IHS Copyright ©2007 American Water Works Association. All Rights Reserved. Licensee=Earth Tech Inc/5906698001, User=Yanez, Simon Not for Resale, 05/08/2008 13:33:54 MDT --`,,```,,`,`,`,`,,,`,,`,,,`,,-`-`,,`,,`,`,,`--- joining pipe, except that 12-in. (300-mm) and larger valves shall be provided with special support, such as treated timbers, crushed stone, concrete pads, or a sufficiently tamped trench bottom, so that the pipe will not be required to support the weight of the valve.
Testing against existing valves is not recommended. When testing against existing valves is necessary, some leakage can be expected and should not be the sole basis for rejection. 6 Acceptance of installation. Acceptance shall be determined on the basis of allowable leakage. If any test of laid pipe discloses leakage greater than that specified, repairs or replacements shall be accomplished in accordance with the contract documents. 1 All visible leaks shall be repaired regardless of the amount of leakage.
900 mm] in diameter). Field joints shall be assembled so that seams in adjacent pipes are offset from each other by at least five times the thickness of the thicker of the pipes being joined. Single-V-groove butt joints may be welded from the outside of the pipe, or from the inside of the pipe if the diameter is large enough. The backing rings may be left in place after welding. Line-up clamps can assist in the pipe installation. The installation procedure of field-welded butt joints is basically identical to the above except that when the two ends have touched, caution should be exercised to ensure that the proper root opening is achieved and the pipe is firmly secured in position prior to installing subsequent pipe segments.