1、BSI Standards PublicationBS EN 13480-6:2012Metallic industrial pipingPart 6: Additional requirements for buriedpipingBS EN 13480-6:2012Incorporating corrigendum October 2014BS EN 13480-6:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 13480-6:2012. It super
2、sedes BS EN 13480-6:2004, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PVE/10, Piping systems.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the nece
3、ssary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014ISBN 978 0 580 84547 5ICS 23.040.01Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard
4、was published under the authority of the Standards Policy and Strategy Committee on 31 July 2012.Amendments/corrigenda issued since publicationDate Text affected31 October 2014 Implementation of CEN Correction Notice 27 August 2014: Foreword amended and Annexes Y and ZA updatedEUROPEAN STANDARD NORM
5、E EUROPENNE EUROPISCHE NORM EN 13480-6 June 2012 ICS 23.040.01 Supersedes EN 13480-6:2004English Version Metallic industrial piping - Part 6: Additional requirements for buried piping Tuyauteries industrielles mtalliques - Partie 6: Exigences complmentaires relatives aux tuyauteries enterres Metalli
6、sche industrielle Rohrleitungen - Teil 6: Zustzliche Anforderungen an erdgedeckte Rohrleitungen This European Standard was approved by CEN on 8 May 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the sta
7、tus of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, G
8、erman). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croa
9、tia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR S
10、TANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13480-6:2012: EEN 13480-6:2012 (E) Issue 3 (2014
11、-08) 2ContentsPage Foreword 3 1 Scope 5 2 Normative references 5 3 General 5 3.1 Safety 5 3.2 Routes .6 3.3 Depth of installation 6 3.4 Pipes marking and recording .6 3.5 Internal inspection provisions 6 3.6 Contents removal.6 3.7 Trench drainage .7 4 Materials .7 5 Design and calculation 7 5.1 Mini
12、mum wall thickness for buried piping 7 5.2 Design .7 6 Installation 9 6.1 Trenches .9 6.2 Pipe laying 9 6.3 Back filling 9 7 Sleeves or casings 10 8 Corrosion protection .10 8.1 General 10 8.2 Coatings 10 8.3 Cathodic protection .11 9 Examination and testing .11 Annex A (normative) Calculations for
13、buried piping .12 Annex Y (informative) History of EN 13480-6 .35 Annex ZA (informative) Relationship between this European standard and the essential requirements of EU Directive 97/23/EC .36 Bibliography 37 BS EN 13480-6:2012EN 13480-6:2012 (E)EN 13480-6:2012 (E) Issue 3 (2014-08) 3ForewordThis do
14、cument (EN 13480-6:2012) has been prepared by Technical Committee CEN/TC 267 “Industrial piping and pipelines”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the lat
15、est by December 2012, and conflicting national standards shall be withdrawn at the latest by December 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or al
16、l such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of
17、 this document. This European Standard EN 13480 for metallic industrial piping consists of seven interdependent and not dissociable parts which are: Part 1: General; Part 2: Materials; Part 3: Design and calculation; Part 4: Fabrication and installation; Part 5: Inspection and testing; Part 6: Addit
18、ional requirements for buried piping; CEN/TR 13480-7, Guidance on the use of conformity assessment procedures; Part 8: Additional requirements for aluminium and aluminium alloy piping. Although these Parts may be obtained separately, it should be recognised that the Parts are inter-dependant. As suc
19、h the manufacture of metallic industrial piping requires the application of all the relevant Parts in order for the requirements of the Standard to be satisfactorily fulfilled. This European Standard will be maintained by a Maintenance MHD working group whose scope of working is limited to correctio
20、ns and interpretations related to EN 13480. The contact to submit queries can be found at http:/www.unm.fr (en13480unm.fr). A form for submitting questions can be downloaded from the link to the MHD website. After subject experts have agreed an answer, the answer will be communicated to the question
21、er. Corrected pages will be given specific issue number and issued by CEN according to CEN Rules. Interpretation sheets will be posted on the website of the MHD. BS EN 13480-6:2012EN 13480-6:2012 (E)EN 13480-6:2012 (E) Issue 3 (2014-08) 4This document supersedes EN 13480-6:2004+A1:2005. This new edi
22、tion incorporates the Amendments/the corrigenda which have been approved previously by CEN members, and the corrected pages up to Issue 17 without any further technical change. Annex Y provides details of significant technical changes between this European Standard and the previous edition. Amendmen
23、ts to this new edition may be issued from time to time and then used immediately as alternatives to rules contained herein. It is intended to deliver a new Issue of EN 13480:2012 each year, consolidating these Amendments and including other identified corrections. Issue 3 (2014-08) includes the corr
24、ected pages listed in Annex Y. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Rep
25、ublic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 13480-6:2012EN 13480-6:2012 (E)EN 13480-6:2012 (E)
26、 Issue 3 (2014-08) 51 Scope This document specifies requirements for industrial piping either totally buried or partly buried and partly run in sleeves or similar protection. It is used in conjunction with the other six parts of EN 13480. Where buried piping subject to this standard connects to pipi
27、ng installed under other jurisdiction such as pipelines, the transition should be made at a closing element e.g. an isolating or regulating valve separating the two sections. This should be close to the boundary of the industrial site, but may be inside or outside the boundary. Operating temperature
28、 up to 75 C. NOTE For higher temperatures reference should be made to EN 13941+A1:2010, but it should be kept in mind, that CEN/TC 107 only deals with pre-insulated piping with temperatures up to 140 C and diameters up to 800 mm, which is state of the art for these products. 2 Normative references T
29、he following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13480
30、-1:2012, Metallic industrial piping Part 1: GeneralEN 13480-2:2012, Metallic industrial piping Part 2: MaterialsEN 13480-3:2012, Metallic industrial piping Part 3: Design and calculationEN 13480-5:2012, Metallic industrial piping Part 5: Inspection and testing 3 General 3.1 Safety a) Buried piping w
31、ithin an industrial site presents a potential hazard to site personal, equipment and environment. The sections set out in this document provide guidance as to how the hazard presented by the piping may be assessed, and the integrity of the piping system maintained. NOTE 1 Attention is drawn to appro
32、priate National or Local regulations. b) The main factors to be considered are: Design including Routing, Layout, Interaction with connecting systems; Materials and Construction Specification and Quality Control; Operating Procedures and Control; Corrosion protection; External Impact Protection and
33、Mitigation. BS EN 13480-6:2012EN 13480-6:2012 (E)EN 13480-6:2012 (E) Issue 3 (2014-08) 6All of these factors interact. NOTE 2 It is recommended that all buried piping be subjected to a formal hazard analysis procedure. NOTE 3 Attention is drawn to appropriate National or Local regulations. c) Additi
34、onal safety requirements may be specified for group 1 fluids according to EN 13480-1:2012, including automated means of isolating buried sections of piping. 3.2 Routes All routes for buried piping shall be agreed with the owner and operator of the site. The site owner shall be required to furnish de
35、tails of all other actual or planned buried services (including cables) and all roadways or other surface loads within the construction working width or zone of the proposed pipe. Piping in category III according to EN 13480-1:2012 shall be separated from any other pipe or service by a minimum dista
36、nce of 0,25 m unless it can be demonstrated that a smaller distance is acceptable. 3.3 Depth of installation In the absence of special protection (e.g. concrete slabs) buried piping shall be provided with a minimum cover of 0,8 m. The designer shall consider increasing the extent of cover above the
37、minimum where penetrating cold or frost heave of the ground is likely, or where damage from excavation activities is a possibility. 3.4 Pipes marking and recording Buried pipes shall be marked by a continuous tape or other agreed means placed directly above the pipe and no closer than 0,3 m. All bur
38、ied pipes shall be identified on as-installed drawings which accurately locate the route relative to structures or other permanent features. The site owner may require the route to be physically marked by the use of identification posts or cover slabs at appropriate intervals. 3.5 Internal inspectio
39、n provisions Where periodic internal inspection of buried piping is anticipated, and the specification identifies the method proposed, the designer shall incorporate appropriate means of introducing and removing the inspection devices. Such closures, and openings for inspection shall be designed in
40、accordance with EN 13480-3:2012. 3.6 Contents removal The design of the piping system shall make allowance for the safe filling and removal of the contents. This shall include vent and drain points or falls as required, and the selection of appropriate bends and fittings. BS EN 13480-6:2012EN 13480-
41、6:2012 (E)EN 13480-6:2012 (E) Issue 3 (2014-08) 73.7 Trench drainage The designer shall recognize that pipe trenches for buried piping can act as channels for ground water. Appropriate means shall be employed to ensure that the bottom of the trench has sufficient slope to soak-aways or sumps to prev
42、ent accumulation of water around the piping. Where such measures are not possible, the designer shall include the possibility of flotation in the design calculations. In addition, the drainage arrangements shall dispose of the hydrostatic test water. Care shall be exercised during this operation to
43、ensure that washout of bedding material does not occur. 4 Materials Materials shall conform to the requirements of EN 13480-2:2012 except that the value for the specified minimum elongation after fracture for the longitudinal direction (see EN 13480-2:2012, 4.1.4.) shall be 20 %. Materials with elon
44、gation values less than 20 % shall be avoided, and shall only be used subject to agreement between the purchaser and the designer. 5 Design and calculation 5.1 Minimum wall thickness for buried piping Unless the pressure design calculations lead to a greater thickness, the wall thickness of the pipe
45、 shall not be lower than the value given in Table 1. Table 1 Minimum wall thickness for buried piping Nominal size (DN) Minimum thickness mm DN 80 3,280 DN 150 4,7150 DN 450 6,35 450 DN 600 7,9600 DN 950 9,5950 DN 1 % DN 5.2 Design 5.2.1 A simple single dimensional model linking buried pipes and the
46、 surrounding ground may be sufficient for piping designed in accordance with EN 13480-3:2012. More complex analysis of pipe to soil interaction may be used where sufficient accurate geo-mechanical data is available, or where the conditions of this annex cannot be met. NOTE It is assumed that the loa
47、ds imposed by the piping on the soil do not exceed its load bearing capacity. BS EN 13480-6:2012EN 13480-6:2012 (E)EN 13480-6:2012 (E) Issue 3 (2014-08) 85.2.2 The designer shall include in the calculations the weight of soil or backfill above the pipe and the maximum predicted value of traffic or o
48、ther static and dynamic loads imposed on the ground above the pipe. With a minimum immediate (first) cover to the pipe of 150 mm of sand, or similar free-flowing material, the forces may be considered as acting over the entire 180 of the upper pipe surface. 5.2.3 In addition to calculations at the d
49、esign pressure, the loadings on the unpressurized system shall be calculated. 5.2.4 Pipe movement will be significantly restrained by the frictional force at the interface with the surrounding soil, and may be effectively prevented at buried bends and large branches. Unless specific measures are incorporated to permit relative movement, buried pipes shall be considered as fully restrained axially for calculation purposes. The axial stress due to combined pressure and temperature change effects shall be calculated as follows: )(
