ПІДТВЕРДЖУВАЛЬНЕ ПОВІДОМЛЕННЯ
Державне підприємство
«Український науково-дослідний і навчальний центр
проблем стандартизації, сертифікації та якості»
(ДП «УкрНДНЦ»)
Наказ від 29.09.2016 № 287
EN 13941:2009 + А1:2010
Design and installation of preinsulated bonded pipe systems for district heating
прийнято як національний стандарт
методом «підтвердження» за позначенням
ДСТУ EN 13941:2016
(EN 13941:2009 + А1:2010, IDT)
Проектування та будівництво попередньо ізольованих систем трубопроводів
із нерухомою ізоляцією для розподільчих мереж опалення
З наданням чинності від 2016-11-01
EN 13941:2009+A1
July 2010
ICS 23.040.10; 91.140.10
Conception et installation des systemes bloques de tuyaux
preisoIes pour les reseaux enterres d’eau chaude
Auslegung und Installation von werkmaBig gedammten
Verbundmantelrohren fur die Femwarme
EUROPEAN STANDARD
NORME EUROPEENNE
EUROPAISCHE NORM
Supersedes EN 13941:2009
English Version
Design and installation of preinsulated bonded pipe systems for
district heating
This European Standard was approved by CEN on 23 May 2009 and includes Corrigendum 1 issued by CEN on 11 November 2009 and Amendment 1 approved by CEN on 15 May 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status 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 Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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 and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION СОМІТЁ EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG
M
Ref. No. EN 13941:2009+A1:2010: E
anagement Centre: Avenue Marnix 17, B-1000 Brussels© 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members
.Contents Page
Foreword 5
Introduction 6
Scope 8
Normative references _8
Terms and definitions, units and symbols 10
Terms and definitions 10
Units and symbols 15
Units 15
Symbols 16
General considerations for system design 18
General requirements 1 ®
Service life 18
Preliminary investigations 18
Determination of project class 1S
Risk assessment 19
Project classes 20
Design documentation 22
General 22
Operational data 22
Data related to the pipeline 22
Specifications for quality control 24
Components and materials 25
Basic requirements 25
E) General®] 25
B) Non standardised components ®] 25
Steel pipe components 25
General 25
Technical delivery conditions and documentation 26
Characteristic values for steel 26
Specific requirements for bends and tees 27
Specific requirements for reducers and extensions 28
Specific requirements for other components 28
Polyurethane foam insulation 28
PE casing 29
Expansion cushions 29
Valves and accessories 29
General requirements 29
Marking and documentation 29
Actions and limit states 30
General 30
Simplified analysis procedure 32
Actions 32
General 32
Classification of actions 32
Limit states 34
General 34
Limit states for service pipes of steel 34
Composite stress conditions 42
Limit states for PUR and PE 43
Limit state for PE 43
Limit states for valves 44
Installation 44
General 44
Transportation and storage 45
Excavation of pipe trench 45
Installation of pipes and components 45
General 45
Steel pipes 46
PUR-PE Joints 46
Accessories 46
Expansion zones 46
Welding of the steel pipe and testing of the steel welds 46
General 46
Quality system for the different project classes 47
Qualification of the welding procedures 49
Welding consumables 49
Place and position of the weld 49
Performance of welding work 49
Special procedures 52
Documentation 54
Strength pressure test and leak tightness test 54
Assembly of casing pipes, joint installation and site insulation 55
Backfilling of trench 55
Pipe bends and other components 56
Pipe bends 56
Branches 56
Valves and accessories 57
Setting into operation 57
General 57
Filling with water for initial operation 57
Surveillance system 57
Special constructions 58
Special components 58
Above-ground pipelines with preinsulated pipes 58
Insertion into casing pipe 58
Construction work during the operation stage 58
(normative) Design of piping components under internal pressure 60
A.1 General 60
A.2 Symbols 60
A.3 Straight pipe and bends 61
A.4 Tees and branch connections 61
A.5 Reducers and extensions 64
A.6 Dished ends 65
(informative) Geotechnics and pipe-soil interaction 67
Scope 67
Symbols and units 67
Soil parameters for global analysis (pipe-soil interaction) 68
Characteristic values for soil loads and soil parameters 78
Specific requirements for stability 79
Specific requirements for parallel excavations 82
Requirements for soft soils and settlement areas 82
Ovalization and circumferential stresses from top load 82
(informative) Global- and cross sectional analysis 89
C.1 General 89
C.2 Symbols 89
C.3 Survey of limit states for steel 91
C.4 Locations to be assessed 92
C.5 Actions 95
C.6 Global analysis 96
C.7 Calculation of stresses 103
C.8 Fatigue analysis 119
C.9 Further actions 120
(informative) Calculation of heat losses 121
D.1 General 121
D.2 Heat loss per pipe pair 121
D.3 Insulance of the soil 122
D.4 Insulance of the insulation material 122
D.5 Insulance of the heat exchange between flow and return pipe 123
(informative) |ac) National А-deviations <ac] 124
Bibliography 125Foreword
This document (EN 13941:2009+A1:2010) has been prepared by Technical Committee CEN/TC 107 “Prefabricated district heating pipe systems”, the secretariat of which is held by DS.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2011, and conflicting national standards shall be withdrawn at the latest by January 2011.
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 all such patent rights.
This document includes Corrigendum 1 issued by CEN on 11 November 2009 and Amendment 1 approved by CEN on 15 May 2010.
This document supersedes E) EN 13941:2009 ®|.
The start and finish of text introduced or altered by amendment is indicated in the text by tags E) ®J.
The modifications of the related CEN Corrigendum have been implemented at the appropriate places in the text and are indicated by the tags (ac> (ас].
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.Introduction
The standard has been prepared by JWG1, a joint working group with CEN/TC267 "Industrial piping and pipelines".
According to the scope from CEN/TC 107:
The task of CEN/TC 107/TC267/JWG1 is to specify rules for design, calculation and installation for preinsulated bonded pipe systems for underground hot water networks with pipe assemblies co-ordinated with EN 253, EN 448, EN 488 and EN 489.
CEN/TC 107/TC267/JWG1 may also specify rules for functional tests for preinsulated bonded pipe systems for underground hot water networks.
The basic rules for design, calculation and installation should be based on functional requirements.
The purpose of the work is to provide uniform basis for the design, construction and operation of district heating systems, to ensure that the system is reliable and efficient and safe for the surrounding area, the environment and public health.
Joint assemblies for pipe systems dealt with should be co-ordinated with EN 489.
This standard takes account of experience acquired, of new knowledge available, of the behaviour of material and of distribution of stresses and allowable deformations and also evolution in installation techniques.
When use is made of the standard, the different sections of which it is made up must be interpreted as being interdependent and, because of this, cannot be dissociated.
The standard consists of a main part and four annexes.
Depending on the character of the individual clauses, distinction is made in this standard between Principles and Application Rules.
The principles comprise:
general statements, definitions and requirements, for which there is no alternative, as well as
requirements and analytical models for which no alternative is permitted unless specifically stated.
The principles are printed in normal typeface (10 point font).
The application rules are generally recognised rules, which follow the principles and satisfy their requirements.
Application rule:
The application rules and comments to principles and application rules are printed in a 8 point font. This is an application rule.
It is permissible to use alternative design rules from the application rules given in this standard, provided that it is shown that the alternative rule accords with the relevant principles and it is at least equivalent with regard to the resistance, serviceability and durability achieved by the system.
Annex A is part of the standard (principles). Annexes В, C and D have status as application rules.
This standard contains a number of requirements aimed at ensuring the sound execution of distribution networks for district heating. To the extent possible, the requirements specified in this standard are functional requirements.
The requirements and regulations contained in this standard should be assessed and applied in compliance with the intentions of the standard and in due consideration of the development taking place in the field it concerns. It is therefore assumed that the user of the standard has the requisite technical insight and that the user of the standard has adequate knowledge of legal and other external regulations that are of consequence to the practical application of the standard.
Special cases may occur within the scope of this standard in which its contents do not cover. An evaluation whether the contents cover shall be made in any specific case where the standard is used.
Presently CEN/TC 107 "Pre-fabricated district heating pipe systems" is preparing standards for preinsulated flexible pipes and surveillance systems.Scope
This European Standard specifies rules for design, calculation and installation for preinsulated bonded pipe systems for buried hot water distribution and transmission networks (cf. Figure 2) with pipe assemblies in accordance with EN 253, for continuous operation with hot water at various temperatures up to 120°C and occasionally with peak temperatures up to 140°C and maximum internal pressure 25 bar (overpressure).
Application rule:
For larger pipe dimensions and pressures below 25 bar wall thickness bigger than specified in EN 253 can be required for straight pipes, bends and tees.
The principles of the standard can be applied to preinsulated pipe systems with pressures higher than 25 bar, provided that special attention is paid to the effects of pressure. Adjacent pipes belonging to the network (e g. pipes in ducts, valve chambers, road crossings above ground etc.) can be designed and installed according to this standard.
The standard assumes use of treated water, which by softening, demineralisation, deaeration, adding of chemicals, or otherwise has been treated to prevent internal corrosion and deposits in the pipes.
This standard is not applicable for such units as:
pumps,
exchangers,
boiler installations, tank installations,
consumer installations.
However, the full functional ability and durability of such units should be ensured in consideration of the impacts from the district heating system and other impacts occurring from the conditions under which they have been installed.
Guidelines for product quality inspection and in situ tests of joints are given in Annex A of EN 448:2009, Annex D of EN 253:2009, Annex A of EN 488:2009 and Annex В of EN 489:2009.
Guidelines for welding of polyethylene casing are given in Annex В of EN 448:2009.
The estimation of expected life with continuous operation at various temperatures is outlined in Annex В of EN 253:2009.
Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 253:2009, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks — Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
EN 287-1, Qualification test of welders — Fusion welding — Part 1: Steels
EN 444, Non-destructive testing — General principles for radiographic examination of metallic materials by X- and gamma-rays
EN 448:2009, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks — Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
EN 473, Non-destructive testing — Qualification and certification of NDT personnel— General principles
EN 488, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks — Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
EN 489:2009, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks — Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
EN 571-1, Non destructive testing — Penetrant testing — Part 1: General principles
EN 583-1, Non-destructive testing — Ultrasonic examination — Part 1: General principles
EN 970, Non-destructive examination of fusion welds— Visual examination
EN 1289, Non-destructive examination of welds — Penetrant testing of welds — Acceptance levels
EN 1290, Non-destructive examination of welds — Magnetic particle examination of welds
EN 1291, Non-destructive examination of welds — Magnetic particle testing of welds — Acceptance levels
EN 1418, Welding personnel — Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials
EN 1435, Non-destructive examination of welds — Radiographic examination of welded joints
EN 1712, Non-destructive examination of welds — Ultrasonic examination of welded joints — Acceptance levels
EN 1714, Non-destructive examination of welds — Ultrasonic examination of welded joints
EN 10204, Metallic products— Types of inspection documents
EN 10216-2, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-1, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties
EN 10217-2, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-5, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 13018, Non-destructive testing— Visual testing— General principles
EN 13480-3:2002, Metallic industrial piping — Part 3: Design and calculation
EN 25817:1992, Arc-welded joints in steel — Guidance on quality levels for imperfections (ISO 5817:1992)
EN ISO 3834-1, Quality requirements for fusion welding of metallic materials — Part 1: Criteria for the selection of the appropriate level of quality requirements (ISO 3834-1:2005)
EN ISO 3834-2, Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive quality requirements (ISO 3834-2:2005)
EN ISO 3834-3, Quality requirements for fusion welding of metallic materials — Part 3: Standard quality requirements (ISO 3834-3:2005)
EN ISO 3834-4, Quality requirements for fusion welding of metallic materials — Part 4: Elementary quality requirements (ISO 3834-4:2005)
EN ISO 9692-2, Welding and allied processes — Joint preparation — Part 2: Submerged arc welding of steels (ISO 9692-2:1998)
EN ISO 14731:2006, Welding coordination — Tasks and responsibilities (ISO 14731:2006)
EN ISO 15607:2003, Specification and qualification of welding procedures for metallic materials — General rules (ISO 15607:2003)
EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding procedure specification — Part 1: Arc welding (ISO 15609-1:2004)
EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614-1:2004)
ISO 1000, S/ units and recommendations for the use of their multiples and of certain other units
ISO 3419, Non-alloy and alloy steel butt-welding fittings
ISO/TR 15608:2000, Welding — Guidelines fora metallic materials grouping system
Terms and definitions, units and symbols
Terms and definitions
For the purpose of this European Standard, the terms and definitions given in EN 253:2009 and the following apply.
