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Dit document mag slechts op een stand-alone PC worden geinstalleerd. Gebruik op een netwerk is alleen.toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone PC. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. Pr Vo ev iew or STANDARD be INTERNATIONAL Méthode de calcul des tuyaux en fonte ductile Dit document is een voorbeeld van NEN / This document is a preview by NEN eld Design method for ductile iron pipes 2011-12-01 Second edition ISO 10803 Reference number © ISO 2011 ISO 10803:2011(E) + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] 10803:2011(E) Vo or Pr ev be iew eld COPYRIGHT PROTECTED DOCUMENT © ISO 2011 All rights reserved. including photocopying and microfilm. Unless otherwise specified. no part of this publication may be reproduced or utilized in any form or by any means.org Web www. electronic or mechanical.iso. without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56  CH-1211 Geneva 20 Tel.org Published in Switzerland ii © ISO 2011 – All rights reserved Dit document is een voorbeeld van NEN / This document is a preview by NEN . .............. 2  5  Design for internal pressure ........... 60  Pr ev be iew eld © ISO 2011 – All rights reserved iii Dit document is een voorbeeld van NEN / This document is a preview by NEN .............. 12  Annex C (informative) Allowable depths of cover for pipes conforming to ISO 7186 ....................................................... 59  Bibliography .................... ISO 10803:2011(E) Contents Page Foreword ......................................................................................... 3  Annex A (informative) Dimensions of preferred and other class pipes ............................................... 9  Annex B (informative) Allowable depths of cover for pipes conforming to ISO 2531 ................................................................................................................................................................................................................................................................................... 54  or Annex D (informative) Trench types ................................................................................................................................................................................................................................................................................................................................... 1  4  Design procedure .......... 1  Vo 3  Terms and definitions .................................................................................................... iv  1  Scope .................................................................................................................................................................................................................................................................................................................................. 1  2  Normative references ................................................ 3  6  Design for external loads.......................................... 58  Annex E (informative) Soil classification........................... Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. The main task of technical committees is to prepare International Standards. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives. ISO shall not be held responsible for identifying any or all such patent rights. which has been technically revised.ISO 10803:2011(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. Part 2. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. This second edition cancels and replaces the first edition (ISO 10803:1999). Cast iron pipes. fittings and their joints. in liaison with ISO. Subcommittee SC 2. The work of preparing International Standards is normally carried out through ISO technical committees. governmental and non-governmental. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Ferrous metal pipes and metallic fittings. Pr ev be iew eld iv © ISO 2011 – All rights reserved Dit document is een voorbeeld van NEN / This document is a preview by NEN . ISO collaborates closely with the Vo International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International organizations. or ISO 10803 was prepared by Technical Committee ISO/TC 5. also take part in the work. including surge.1 allowable operating pressure PFA maximum internal pressure. accessories and their joints for water applications Pr ISO 7186. which a component can safely withstand in permanent service 3.2 allowable maximum operating pressure PMA maximum internal pressure. sewerage and other fluids  with or without internal pressure. ISO 2531. For undated references. For dated references. the latest edition of the referenced document (including any amendments) applies. Ductile iron pipes. excluding surge.3 allowable site test pressure PEA maximum hydrostatic pressure that a newly installed component can withstand for a relatively short duration. only the edition cited applies.INTERNATIONAL STANDARD ISO 10803:2011(E) Design method for ductile iron pipes 1 Scope Vo This International Standard specifies the design of ductile iron pipes used for conveying water. in order to ensure the integrity and leaktightness of the pipeline NOTE This test pressure is different from the system test pressure. © ISO 2011 – All rights reserved 1 Dit document is een voorbeeld van NEN / This document is a preview by NEN . when either fixed above ground level or laid and backfilled underground. which a component can safely withstand in service 3. Pipe components — Definition of nominal pressure ISO 10802. eld 3. Ductile iron pipelines — Hydrostatic testing after installation iew 3 Terms and definitions For the purposes of this document. fittings. which is related to the design pressure of the pipeline. the terms and definitions given in ISO 7268 and the following apply. 2 Normative references or The following referenced documents are indispensable for the application of this document. Ductile iron products for sewerage applications ev be ISO 7268. and  with or without earth and traffic loading. select higher a pressure class of pipe and repeat steps 4. ev be Ductile iron pipes in compliance with ISO 2531 are classified according to their allowable operating pressure for use in water applications.e.1 The pipe wall thickness shall provide adequate strength against the internal pressure of the fluid and Pr against the effects of external loads due to backfill and surcharge. b) calculate the allowable depth of cover in accordance with Clause 6.2 a) and b) until the allowable depth of cover is acceptable. Ductile iron pipes in compliance with ISO 7186 are for sewerage applications iew either under pressure or under gravity.5 bedding lower part of the embedment. national standards or regulations can specify other design procedures.4 embedment arrangement and type(s) of material around a buried pipeline.ISO 10803:2011(E) 3. as defined in AASHTO T99 using a 2. 2 © ISO 2011 – All rights reserved Dit document is een voorbeeld van NEN / This document is a preview by NEN . NOTE 3 In certain countries. i. traffic loadings. which contribute to its structural performance See Figure D. NOTE 2 When installed and operated under the conditions for which they are designed. eld 4.8 or standard Proctor density degree of soil compaction. 3. and b) the depths of cover as given in Annexes B and C.1.2 The design procedure for the pipes is the following: a) from the allowable operating pressure of the pipeline.6 bedding reaction angle conventional angle used in the calculation model to account for the actual soil pressure distribution at pipe invert 3. the design of buried pipes is performed by determining a) the minimum pipe wall thickness for the allowable operating pressure (PFA). select the class of pipe as appropriate from ISO 2531 or ISO 7186 [the minimum pipe wall thickness of these pipes has been calculated from Equation (1)]. fittings. ductile iron pipes.5 kg rammer and a 305 mm drop 4 Design procedure 4. due to constant material properties.1. Vo 3. the pressure class and the allowable depth of cover for the pipes can be selected from the appropriate tables in Annexes B or C without carrying out the detailed calculations as explained above. in most cases.7 compaction deliberate densification of soil during the installation process 3. to the stability of their cross-section and to their design with high safety factors. Using the equations given in Clauses 5 and 6. c) if the allowable depth of cover is not adequate. composed of the lower bedding (if necessary) and the upper bedding See Figure D. accessories and their joints maintain all their functional characteristics over their operating life. NOTE 1 In practice. © ISO 2011 – All rights reserved 3 Dit document is een voorbeeld van NEN / This document is a preview by NEN . enom.001DN (2) Pr be where DN is the nominal diameter of pipe as defined in ISO 2531 and ISO 7186. shall be calculated with a design safety factor of 2.1 MPa. in megapascals (Rm  420 MPa in or ISO 2531 and ISO 7186). in bar 1) (see 5. 1 MPa = 1 N/mm2. DE is the nominal pipe external diameter.2). in millimetres (see Annex A). of the pipe is calculated as given by Equation (2): enom  emin  1. emin. Nominal wall thickness.e. SF is the design safety factor (see 5.1 and nominal pipe wall thicknesses for pressure and gravity pipe classes in accordance with ISO 7186 are given in iew Table A. in millimetres.e. emin. 6 Design for external loads 6.3  0. 5. in millimetres. PFA as indicated in ISO 2531 and ISO 7186).5 for the maximum allowable operating pressure (i.1 Design equation for wall thickness The minimum wall thickness of pipes.4 mm (ISO 7186) and shall be determined using Equation (1): PFA  SF  DE emin  (1) 20 Rm  (PFA  SF) Vo where emin is the minimum pipe wall thickness to resist hoop stress due to internal pressure. Rm is the minimum ultimate tensile strength of the ductile iron.1 Design equation K xq   100 (3) 8 S  0.2). PFA is the allowable operating pressure. shall be not less than 3 mm (as specified in ISO 2531) or 2. ISO 10803:2011(E) 5 Design for internal pressure 5.2.061E  or 1) 100 kPa = 1 bar = 0. PMA as indicated in ISO 2531 and ISO 7186) and a design safety factor eld of 3 for the allowable operating pressure (i.2 Design safety factors The minimum pipe wall thickness. NOTE This allows field testing of installed ductile iron pipelines in compliance with ISO 10802 by application of test pressures up to the allowable test pressures given in ISO 2531 and ISO 7186. ev Nominal pipe wall thicknesses for various classes in accordance with ISO 2531 are given in Table A. D is the mean diameter of pipe DE  e stiff  . in megapascals.ISO 10803:2011(E)   8 S  0. q is the vertical pressure at pipe crown due to all external loads. S. uniformly distributed over the bedding reaction angle 2. Kx is the deflection coefficient depending on bedding reaction angle. in millimetres. may be taken from the relevant annexes of ISO 2531 and ISO 7186. in megapascals. Vo S is the pipe diametral stiffness. in megapascals. acting upward at the pipe invert. is acting downward and:  is uniformly distributed at the pipe crown over a diameter. which gives rise to a horizontal reaction pressure at pipe sides. q. or e 3  I   stiff  is the second moment of area of the pipe wall per unit length. Pr be DE is the nominal pipe external diameter as specified in ISO 2531 and ISO 7186.  is in equilibrium with a pressure. where the vertical pressure. parabolically distributed over an angle of 100°.  causes a pipe deflection. in millimetres to the  12    third power.061E   q (3) K x  100 where  is the pipe diametral deflection. D. E is the modulus of soil reaction. in megapascals (170 000 MPa for ductile iron). NOTE The design equation is based on the Spangler model (see Figure 1). ev estiff is the average of the minimum pipe wall thickness of the pipe and nominal wall thickness of iew pipe. EI S (D ) 3 where E is the modulus of elasticity of the pipe wall material. eld The values of E and Kx are given in Table 1 for each trench type and soil group. in millimetres. Pipe material stiffness values. 4 © ISO 2011 – All rights reserved Dit document is een voorbeeld van NEN / This document is a preview by NEN . in millimetres. in percent of external diameter. any abnormal surface loading can require special consideration. ISO 10803:2011(E) Vo Key 1 vertical pressure. The value of q obtained from Equation (4) is basically a function of H (allowable depth of cover). q  f (H ) (5) Equating this to Equation (3) (see 6. may be determined after calculating the value of q as given in 6.01 E 3 vertical reaction pressure = q/sin or Figure 1 — Spangler model 6.1 General ev be The total vertical pressure.2. NOTE The pressure from traffic loads.2. i.3 and other parameters as defined.061E ) f ( H )  (6) ( K x )  (100) The value of allowable depth of cover.2.1):   (8 S  0. eld q2 is the pressure from traffic loads. q2.2 Loads applied to the pipe and calculation for the allowable depth of cover Pr 6. © ISO 2011 – All rights reserved 5 Dit document is een voorbeeld van NEN / This document is a preview by NEN . however. acting at pipe crown is the sum of the following components: iew q  q1  q 2 (4) where q1 is the pressure from earth loads.e. q. H. is greater than that from normal static loads applied to the ground surface.2 and 6. q 2 lateral reaction pressure = 0.  is the unit weight of the backfill. in metres.75: roads where truck traffic is prohibited.2. except access roads. based on wheel load taken from national and/or local applicable standards and regulations.5: this is the general case. If. In the case where a national standard exists for the traffic loadings. In the absence of other data. in megapascals. iew  is a traffic load factor. If a preliminary geotechnical survey determines that the actual unit weight of the backfill is less than 20 kN/m3. it appears that the actual value is more than 20 kN/m3. 6.04 (1  2  10 4 DN) (8) H Pr be where ev q2 is the pressure at pipe crown.5 and pipelines laid adjacent to roads shall be designed to withstand the full road loading.  0.2 Pressure from earth loads Equation (7) shall be used to calculate q1 from the weight of the earth prism immediately above the pipe: q 1  0. DN is the nominal size. NOTE 1 Equation (8) is not applicable when H  0.2.50: all other cases.3 Pressure from traffic loads or The value of q2 shall be calculated using Equation (8). the actual value should be used.001 H (7) where q1 is the pressure at pipe crown.  q 2  0. the actual value may be used for determining q1. the unit weight of the soil is taken as being equal to 20 kN/m3 in order to cover the vast majority of cases. in kilonewtons. All pipelines shall be designed for at least   0. in megapascals. in metres. 6 © ISO 2011 – All rights reserved Dit document is een voorbeeld van NEN / This document is a preview by NEN . eld  0. however. in kilonewtons per cubic metre.3 m. Vo H is the height of cover (distance from pipe crown to ground surface). H is the height of cover. the following are the given values:  1.ISO 10803:2011(E) 6. the value of  may be given as follows: P  (9) 100 where P is the wheel load. for a particular type of road according to the respective national standard. Table 1 — Modulus of soil reaction. special requirements can apply according to the respective national standard and regulations.5 1 1. However. ISO 10803:2011(E) NOTE 2 For pipelines under railroads or airports or subjected to heavy construction traffic. A preliminary geotechnical survey should be carried out to facilitate identification of the soil and proper selection of E values. E.102 0.5 3.5 2 3 5 eld Soil group D 0.5 Soil group E b b b b b Soil group F b b b b b a Depending on the type of soil and its moisture content. These values provide sufficient safety against yield bending strength of the pipe wall. In very poor ground conditions. E Trench type 1 2 3 4 5 Very light Light Medium High Pr Placement of embedment Dumped compaction compaction compaction compaction be a ev Standard Proctor density of sidefill. a standard Proctor density of 70 % to 80 % should normally be achieved by simply dumping the soil in the trench.085 E (MPa) Soil group A 4 4 5 7 10 Soil group B 2.4 Allowable pipe diametral deflection The allowable pipe diametral deflection. b Use an E value of 0 unless it can be ensured that a higher value is achieved consistently. max.5 2. reduced E values should be applied.5 2.5 3.108 0.105 0. the values of E indicated in Table 1 may be used at the design stage for five typical trench types and for six soil groups (see Annex E Vo for the classification of soils).3 Soil and pipe interaction The bedding reaction angle depends on the installation conditions (bedding. otherwise. 6. of the sidefills depends on the type of soil used for the embedment and upon the trench type (see Annex D). 6. In the absence of applicable standards or other data. it may be necessary to use soil stabilization matting to prevent migration of or embedment with resultant loss of soil reaction modulus. for instance 3 % for cement mortar linings. E.5 5 7 Soil group C 1 1. sidefill compaction) and on the pipe diametral deflection (especially for large sizes). The modulus of soil reaction. © ISO 2011 – All rights reserved 7 Dit document is een voorbeeld van NEN / This document is a preview by NEN .096 0. lining deformation. E values given in Table 1 apply when trench shoring is left in place or removed in such a way as to allow compaction of sidefill against the native trench wall. % 75 80 85 90 Bedding reaction angle (2) 30° 45° 60° 90° 150° iew Kx 0. may be taken from relevant annexes of ISO 2531 and ISO 7186. joint leak tightness and hydraulic capacity of the pipe. national standards and/or the manufacturer's catalogues may introduce more stringent limitations. These data are valid for pipes laid under embankments as well as in trenches. the allowable pipe diametral deflection. DE is the pipe external diameter as defined in ISO 2531 and ISO 7186. b) 2. is the lowest of the following: a) 1. which provides a safety factor of 1. Pr SF is the safety factor (= 1.5). enom is the nominal pipe wall thickness.5 against the yield bending strength of the ductile iron pipe wall: R f  DE  enom   2  100  (10) SF  E  enom  DF where or Rf is the yield bending strength of the pipe wall material (Rf = 500 MPa for ductile iron). in millimetres. eld 8 © ISO 2011 – All rights reserved Dit document is een voorbeeld van NEN / This document is a preview by NEN . iew DF is the deformation factor which depends mainly on the pipe diametral stiffness (for ductile iron pipes.5). with a maximum of 4 %. 500  for flexible linings: Vo 1  5 %. ev be E is the modulus of elasticity of the pipe wall material (E  170 000 MPa for ductile iron). DF  3. which provides a safety factor of 2 against irreversible damage of the lining:  for cement mortar linings (DN  DN 300): DN  300 1  3  . in millimetres. max.ISO 10803:2011(E) For each DN. 90 Wilt u deze norm in PDF-formaat? Deze bestelt u eenvoudig via Stel uw vraag aan www. Gegevens 2600 WB Delft (geen postzegel nodig).2015 .en handelingskosten Uw ordernummer BTW nummer en onder voorbehoud bij Postbus / Adres o. dagelijks van 8. ik bestel www. afdeling Marketing Postbus 5059 Antwoordnummer 10214 2600 GB Delft 2600 WB Delft Vlinderweg 6 2623 AX Delft T (015) 2 690 390 F (015) 2 690 271 Ja. E-mail tenzij anders aangegeven. afdeling Marketing Antwoordnummer 10214.Bestelformulier Stuur naar: NEN Uitgeverij NEN Uitgeverij t. dan betaalt u geen handeling en verzendkosten.nl/normshop __ ex.nen.nl/leveringsvoorwaarden.en IEC-normen.a.a. t.nl e-mailnieuwsbrieven.v.00 uur.nen. ISO. Retourneren Fax: (015) 2 690 271 normalisatie en regelgeving? 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