Bsi bs en 15632 4 2009

BS EN 15632-4:2009 ICS 23.040.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD District heating pipes — Pre-insulated flexible pipe systems Part

BS EN 15632-4:2009

ICS 23.040.01

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

BRITISH STANDARD

District heating pipes

— Pre-insulated

flexible pipe systems

Part 4: Bonded system with metal

service pipes; requirements and test

methods

National foreword

This British Standard is the UK implementation of EN 15632-4:2009 The UK participation in its preparation was entrusted to Technical Committee RHE/9, Insulated underground pipelines

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 necessary provisions

of a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

BS EN 15632-4:2009

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 15632-4

January 2009

ICS 23.040.01

English Version

District heating pipes - Pre-insulated flexible pipe systems - Part

4: Bonded system with metal service pipes; requirements and

test methods

Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles

préisolés - Partie 4: Système bloqué avec tube de service

en métal - Prescriptions et méthodes d'essai

Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme Teil 4: Verbundmediumrohre aus Metall

-Anforderungen und Prüfungen

This European Standard was approved by CEN on 5 December 2008.

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, 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

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reserved

worldwide for CEN national Members.

Ref No EN 15632-4:2009: E

Contents Page

Foreword 3

Introduction 4

1 Scope .5

2 Normative references .5

3 Terms and definitions 5

4 Operating conditions .6

5 Requirements .6

5.1 General requirements .6

5.2 Service pipes and fittings 6

5.3 Axial shear stress .7

5.4 Linear water tightness 7

5.5 Fittings .7

5.6 Surveillance systems .7

6 Test procedures .7

6.1 General .7

6.2 Axial shear stress .7

6.2.1 General .7

6.2.2 Test procedure .8

6.3 Cycle test .9

6.4 Linear water tightness 9

BS EN 15632-4:2009

EN 15632-4:2009 (E)

3

Foreword

This document (EN 15632-4:2009) 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 July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009

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 is one of a series of standards which form several parts of EN 15632, District heating pipes — Pre-insulated flexible pipe systems:

Part 1: Classification, general requirements and test methods;

Part 2: Bonded system with plastic service pipes; requirements and test methods;

Part 3: Non bonded system with plastic service pipes; requirements and test methods;

Part 4: Bonded system with metal service pipes; requirements and test methods

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, 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

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Introduction

Pre-insulated flexible bonded pipe systems with metallic service pipes are used in district and local heating networks

This part of the series of standards for the various types of flexible pipe systems is intended to be used in connection with EN 15632-1 where the basic design criteria for flexible district heating pipes are specified

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BS EN 15632-4:2009

EN 15632-4:2009 (E)

5

1 Scope

This European Standard provides requirements and test methods for flexible, pre-insulated, directly buried district heating pipe assemblies with metallic service pipes and bonding between the layers of the pipes and thermal insulation materials of polyurethane or polyisocyanurate foam, the casing pipes being made of polyethylene

This European Standard is valid for maximum operating temperatures up to 140 °C and pressures up to

25 bar for a design lifetime of at least 30 years

NOTE For higher temperatures or for the transport of other fluids, for example potable water, additional requirements and testing is needed Such requirements are not specified in this European Standard

2 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 1057, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and heating applications

EN 10088-2, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes

EN 10246-1, Non destructive testing of steel tubes — Part 1: Automatic electromagnetic testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness

EN 10305-1, Steel tubes for precision applications — Technical delivery conditions — Part 1: Seamless cold drawn tubes

EN 10305-2, Steel tubes for precision applications — Technical delivery conditions — Part 2: Welded cold drawn tubes

EN 12449, Copper and copper alloys — Seamless, round tubes for general purposes

EN 13941, Design and installation of preinsulated bonded pipe systems for district heating

EN 14419, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks

— Surveillance systems

EN 15632-1:2009, District heating pipes – Pre-insulated flexible pipe systems – Part 1: Classification, general requirements and test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 15632-1:2009 shall apply

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4 Operating conditions

Pipe systems according to this European Standard shall have a lifetime of at least 30 years at a continuous operating temperature of 120 °C and a maximum operating temperature of 140°C

Table 1 —Operating pressures

Service pipe Operating Pressure

16 bar 25 bar

Corrugated stainless steel X X

5 Requirements

5.1 General requirements

In addition to the general requirements defined in EN 15632-1, the following product specific requirements apply

5.2 Service pipes and fittings

The service pipes shall fulfil the requirements of diameter and wall thickness in Table 2

Table 2 — Nominal diameters and minimum wall thickness Nominal

diameter

DN

Outside diameter d 2 , minimum inside diameter d 1, and

minimum wall thickness s

mm Copper Mild steel Corrugated stainless steel

d 2

mm

s

mm

d 2

mm

s

mm

d 1

mm

s

mm

12

16

20

25

32

15

18

22

28

35

1,0 1,0 1,0 1,2 1,5

-

20

25

28

-

- 2,0 2,0 2,0

-

14

18

22

30

39

0,2 0,2 0,2 0,3 0,4

40

50

65

42

54

-

1,5 1,5

-

-

-

-

-

-

-

48

60

75

0,5 0,5 0,6

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BS EN 15632-4:2009

EN 15632-4:2009 (E)

7

For seamless steel pipes EN 10305-1 shall be applied The material shall be E215+N

For welded steel pipes EN 10305-2 shall be applied The material shall be E215+N Welded pipes shall be tightness tested according to EN 10246-1

Deviating from these standards, service pipes and fittings shall be designed and tested for the operating cycles specified in 6.3

5.3 Axial shear stress

The axial shear strength between the service pipe and the insulation shall be at least 0,12 MPa when tested according to 6.2 at ambient temperature

The axial shear strength between the service pipe and the insulation shall be at least 0,08 MPa when tested according to 6.2 at maximum operating temperature

This requirement is only applicable for smooth wall service pipes and not relevant for corrugated stainless steel pipes

5.4 Linear water tightness

When tested in accordance with 6.4, the amount of water leaking through any of the pipe ends shall not exceed 100 g after 168 hours

5.5 Fittings

When tested in accordance with 6.3 there shall be no leakage

5.6 Surveillance systems

If measuring systems are installed, all relevant requirements of EN 14419 shall be fulfilled before and after the flexibility test according to EN 15632-1:2009, 6.1, and the linear water tightness test according to 6.4 of this document shall be performed with the measuring elements installed

6 Test procedures

6.1 General

Unless stated otherwise, all tests are to be carried out:

 no sooner than 72 hours after production,

 at room temperature,

 on samples taken from coiled pipes

6.2 Axial shear stress

6.2.1 General

The shear stress of a soft steel or copper smooth walled pipe assembly shall be determined on at least 3 test specimens at each temperature

There shall be no visual air gap between service pipe and insulation on a corrugated stainless pipe assembly (For corrugated stainless steel pipe assembly an axial shear test cannot be carried out)

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6.2.2 Test procedure

The axial shear stress between the service pipe and the insulation shall be tested as shown in Figure 1, where (1) is the test specimen, (2) a cylindrical piston pressing onto the service pipe and a support (3) with a cylindrical opening

The test specimen (1) shall have a length which equals the outer diameter of the casing ± 5 %, the ends shall

be cut at right angle

The piston (2) shall be made from metal and shall have an outer diameter which equals the outer diameter of the service pipe with a tolerance of up to −01mm

The support (3) shall be made of metal, the diameter of the circular central opening shall equal the mean of the inner and outer diameter of the insulation

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BS EN 15632-4:2009

EN 15632-4:2009 (E)

9

The piston (2) and the support (3) are to be moved towards each other with a tensile testing machine at a constant speed of 5 mm per minute and the movement and the force is to be recorded

The shear stress τax is to be calculated as follows:

τax = F/(L· d 2 ·π) in N/m2

where

F is the recorded force in N

L is the length of the test in m

d2 is the outer diameter of the service pipe in m

6.3 Cycle test

A straight sample of service pipe shall be fitted with a connector at one side and a T-piece or a reducer at the other side The length of the sample shall be at least 5 times the outer diameter of the pipe This sample shall

be tested at alternating strain and alternating operating pressure according to Table 3 at the continuous operating temperature of the pipe system The test cycles for service pipes are given in Table 4

Table 3 — Pressure testing of fittings

Material Alternating

strain mm/m

Alternating pressure

bar

Connection of the fitting

Mild steel 0 to 1,2 2 to 25 Butt weld

Butt welded T-piece or reducer Copper 0 to 1,7 2 to 16 Soldered connector or press coupling

Soldered T-piece or reducer or press T-piece or

reducer Corrugated

stainless steel 0 to 1,7 2 to 25 System specific connector System specific T-piece

Table 4 — Test cycles for service pipes

Service pipe nominal diameter DN Test cycles Cycle times

The test cycle numbers are derived from EN 13941

6.4 Linear water tightness

On a 4 m long sample of the pipe, taken from a pipe in the delivery condition the casing shall be removed on 0,1 m at 2,0 m distance from one pipe end

A suitable water container shall be sealed to the casing at both sides of the exposed insulation and be filled with water with a pressure of 0,05 bar at room temperature

The sample shall be placed horizontally

In both ends of the sample a suitable container shall be mounted to collect water leaking from the pipe end After 168 h, the water collected from the pipe ends shall be weighted

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