ANSI AWWA C903-2005 Polyethylene-Aluminum-Polyethylene & Crosslinked Polyethylene-Aluminum-Crosslinked Polyethylene Composite Pressure Pipes 1 2 In (12 mm) Through 2 In (50 mm) for.pdf
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1、The Authoritative Resource on Safe WaterSMANSI/AWWA C903-05(Revision of ANSI/AWWA C903-02)AWWA StandardEffective date: Sept. 1, 2005.First edition approved by AWWA Board of Directors June 23, 1991.This edition approved June 12, 2005.Approved by American National Standards Institute Mar. 23, 2005.Pol
2、yethyleneAluminumPolyethylene (212) 642-4900.Science and TechnologyAWWA unites the entire water community by developing and distributing authoritative scientific and technologicalknowledge. Through its members, AWWA develops industry standards for products and processes that advance publichealth and
3、 safety. AWWA also provides quality improvement programs for water and wastewater utilities.All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronicor mechanical, including photocopy, recording, or any information or retrieval system,
4、except in the form of briefexcerpts or quotations for review purposes, without the written permission of the publisher. Copyright 2005 by American Water Works AssociationPrinted in USACopyright 2005 American Water Works Association, All Rights Reserved.Approved by American National Standards Institu
5、te: May 21, 2002.Copyright American Water Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iiiCommittee PersonnelThe AWWA Standards Committee on Polyolefin Pressure Pipe and Fittings, whichreviewed and approve
6、d this standard, had the following personnel at the time of approval:Michael G. Boyle, ChairGeneral Interest MembersJ.P. Castronovo, CH2M Hill, Gainesville, Fla. (AWWA)K.C. Choquette, Iowa Department of Public Health, Des Moines, Iowa (AWWA)D.E. Duvall, Engineering Systems Inc., Aurora, Ill. (AWWA)M
7、.L. Magnant, Iowa Department of Public Health, Des Moines, Iowa (AWWA)S.A. Mruk, New Providence, N.J. (PPI)J.R. Paschal, Bodycote Polymer-Broutman Laboratory, Ypsilanti, Mich. (AWWA)J.R. Peters, M.D. Wessler theirsolutions require specialized knowledge.Copyright 2005 American Water Works Association
8、, All Rights Reserved.Approved by American National Standards Institute: May 21, 2002.Copyright American Water Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-xThe wave velocity and surge pressure that result
9、 from abrupt changes in thevelocity of a column of water moving through a restrained pipe may be calculatedusing the following formulas:Where:a = wave velocity, in ft/sec (m/sec)K = bulk modulus of water 294,000 lb/in.2(2,100 MPa) = density of water 1,000 lb/in.3(kg/m3)d = internal diameter, in. (mm
10、)t = equivalent thickness of polyethylene, in. (mm)tPEi= inner polyethylene layer thickness, in. (mm)EAL= elastic modulus of aluminum, 4.20 106psi (30,000 MPa)EPE= elastic modulus of polyethylene, 150,000 psi (1,047 MPa)EPEX= elastic modulus of cross-linked polyethylene, 150,000 psi*(1,047 MPa)tAL=
11、aluminum layer thickness, in. (mm)tPEo= outer polyethylene layer thickness, in. (mm)Ps= surge pressure, psig (kPa)vo= change in flow velocity, in ft/sec (m/sec)Table F.1 shows surge pressures resulting from an instantaneous change invelocity of 1 ft/sec (0.3048 m/sec), as calculated from the earlier
12、 equations. Theanticipated surge and the instantaneous change in velocity are directly related;therefore, the surge resulting from higher velocity changes is a multiple of the valuesgiven in this table (i.e., the surge anticipated at a velocity of 5 ft/sec 1.524 m/sec isfive times the value at 1 ft/
13、sec 0.3048 m/sec).*If calculating surge pressure in PEX-AL-PEX service lines, use EPEXinstead of EPE.aK 1 Kd()tEPE()+-=ttPEiEALEPE()tALtPEo+=Psvoa=Copyright 2005 American Water Works Association, All Rights Reserved.Approved by American National Standards Institute: May 21, 2002.Copyright American W
14、ater Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-xiII.A.3. Temperature effects. The pressure rating of PR 200 for pipes in ANSI/AWWA C903 is based on water temperatures of 73.4F (23C). For elevatedtempera
15、tures, Table 7 details pressure ratings for pipes, 180F (82C), and 200F(93C).These pressure ratings are obtained by multiplying the pressure design basis(PDB) by a 0.5 design factor, recommended by the Plastics Pipe Institute (PPI),*inkeeping with PPI TR-3 and listed in PPI TR-4 for composite “multi
16、layer” pipe.II.B. External Loads.II.B.1. Earth loads. For properly installed small-diameter conduit, the effectsof distributed earth loads can usually be disregarded.II.B.2. Live loads. Pipe should be installed to preclude construction loads andsubsequent traffic loads. If the installation is to be
17、subjected to surface traffic, aminimum cover of 12 in. (30.5 cm) should be provided, and trench backfill in thepipe zone should be compacted to at least 90 percent of the laboratory maximumdensity of the backfill soil, as determined in accordance with ASTM D698. SectionII.C.4 of this Foreword provid
18、es further detail.Table F.1 Calculated surge pressures for an instantaneous change in velocity of 1 ft/sec (0.3048 m/sec) in PEALPE or PEXALPEX pipePipe Diameter Surge Pressurein. (ID/OD mm) psig (kPa)11/2 (12 / 16) 29.6 (205.4)15/8 (16 / 20) 29.0 (201.7)13/4 (20 / 25) 26.5 (184.3)11/2 (25 / 32) 25.
19、0 (173.8)11/4 (32 / 40) 23.3 (161.8)11/2 (41 / 50) 22.2 (154.2)21/2 (51 / 63) 19.5 (135.4)NOTE: Metric nominal pipe size is described by a four-digit numbering system. The first two digitsrepresent nominal inside diameter (ID) in mm. The last two digits represent nominal outside diameter(OD) in mm.
20、As an example, nominal pipe size 12/16 has nominal ID of 12 mm and nominal ODof 16 mm.*Plastics Pipe Institute, 1825 Connecticut Ave., N.W., Suite 680, Washington, DC 20005.Copyright 2005 American Water Works Association, All Rights Reserved.Approved by American National Standards Institute: May 21,
21、 2002.Copyright American Water Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-xiiII.B.3. Concentrated loads. Pipe installations should be designed and con-structed to preclude localized concentrated loadings
22、, such as point contact withstones; the effect of differential earth settlement, particularly at points of connectionwith rigidly anchored fittings; and excessive bending caused by installationconfiguration, especially fittings.II.C. Installation.II.C.1. Storage and handling. PEALPE and PEXALPEX pip
23、e should bestored in a way that prevents damage caused by crushing, abrasion, piercing, excessiveheat, harmful chemicals, or exposure to sunlight for prolonged periods. Themanufacturers recommendations regarding storage should be followed.PEALPE pipe and PEXALPEX pipe are not subject to breakage dur
24、ingnormal handling. However, they are subject to damage by hard objects with a cuttingedge. Therefore, handling operations, trench installation, and backfill should beperformed with reasonable care to prevent scratches, nicks, and gouges in theconduit.Practices such as dragging coils of pipe over ro
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