Elastomeric packed metallic stripwound safety gas hose assemblies for the connection of domestic appliances using gaseous fuels

The objective of this European Standard is to achieve safe operation of strip wound flexible metallic gas hose assemblies by specifying the requirements of performance, materials and test methods.
The strip wound flexible metallic gas hose assemblies as specified are suitable for the connection of domestic appliances inside or outside a dwelling, using gas at a pressure lower than 0,5 bar.
These assemblies are designed for the use with movable appliances; they may also be used for the connection of fixed appliances.
Where these assemblies are directly connected to a valve, such a valve shall be compatible with the strip wound flexible metallic gas hose assembly and shall conform to prEN ? (WI 00236004).
The term gas relates to a first, second or third family gas as referred to in EN 437, Table 1. These gases are commonly referred to as manufactured gases, natural gases or petroleum gases (LPG).

Gewickelte, metallene Sicherheits-Gasschlauchlauchleitungen mit Elastomerdichtung für den Anschluss von Haushaltsgasgeräten

Das Ziel dieser europäischen Norm ist, die sichere Funktion von gewellten metallenen Gasschlauchleitungen sicherzustellen, indem die Anforderungen an die Gebrauchstauglichkeit, die Werkstoffe und Prüfverfahren festgelegt werden.
Die spezifizierten gewickelten metallenen Gasschlauchleitungen können für die Verbindung von Haushaltsgasgeräten im inneren oder außerhalb von Wohnungen bei einem Gasdruck von weniger als 0,5 bar eingesetzt werden.
Diese Schlauchleitungen sind zum Gebrauch mit beweglichen Geräten gedacht, sie können ebenso zum Anschluss für fest installierte Geräte verwendet werden.
Sind Schlauchleitungen direkt an Ventilen angeschlossen, müssen diese passend zur gewickelten metallenen Gasschlauchleitungen sein und der prEN 15069 entsprechen.
Die Bezeichnung Gas bezieht sich auf Gas der ersten, zweiten oder dritten Gasfamilie nach EN 437, Tabelle 1. Diese Gase werden allgemein als Stadtgas, Erdgas oder Flüssiggase (LPG) bezeichnet.

Tuyaux flexibles caoutchouc agrafés pour le raccordement des appareils à usage domestique utilisant des combustibles gazeux

Gibljivi varnostni kovinski cevni priključki za priključitev gospodinjskih plinskih aparatov

General Information

Status
Not Published
Public Enquiry End Date
14-Dec-2007
Technical Committee
Current Stage
98 - Abandoned project (Adopted Project)
Start Date
08-Sep-2010
Due Date
13-Sep-2010
Completion Date
08-Sep-2010

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SLOVENSKI OSIST prEN 15070:2004
PREDSTANDARD
december 2004
Gibljivi varnostni kovinski cevni priključki za priključitev gospodinjskih
plinskih aparatov

Strip wound flexible safety metallic hose assemblies for the connection of domestic

appliances using gaseous fuels
ICS 23.040.10; 91.140.40 Referenčna številka
OSIST prEN 15070:2004(en;fr;de)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
DRAFT
prEN 15070
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2004
ICS
English version
Strip wound flexible safety metallic hose assemblies for the
connection of domestic appliances using gaseous fuels

Tuyaux flexibles métalliques agrafés de sécurité pour le Gewickelte, flexible metallene

raccordement des appareils à usage domestique utilisant Sicherheitsgasschlauchleitungen für den Anschluss von

les combustibles gazeux Haushaltsgasgeräten

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 236.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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 Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15070:2004: E

worldwide for CEN national Members.
---------------------- Page: 2 ----------------------
prEN 15070:2004 (E)
Contents Page

Foreword..............................................................................................................................................................3

1 Scope ......................................................................................................................................................4

2 Normative references ............................................................................................................................4

3 Terms and definitions ...........................................................................................................................4

4 Construction requirements...................................................................................................................6

5 Performance and test requirements ....................................................................................................8

6 Evaluation of conformity.....................................................................................................................24

Annex A (informative) Hose fitting design requirements for connection to the gas supply

pipework, to the pressure reduction device of portable gas bottles or to the domestic

appliance ..............................................................................................................................................28

Annex ZA (informative) Clauses of this European Standard addressing the provision of the EU

Construction Products Directive........................................................................................................45

Bibliography ......................................................................................................................................................50

---------------------- Page: 3 ----------------------
prEN 15070:2004 (E)
Foreword

This document (prEN 15070:2004) has been prepared by Technical Committee CEN/TC 236 “Non industrial

manually operated shut-off valves for gas and particular combinations valves-other products”, the secretariat

of which is held by UNI.
This document is currently submitted to the CEN Enquiry.

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 this document.

This draft European Standard was prepared by CEN/TC 236/WG2, the Secretariat of which is held by SNV.

The working group was in liaison with CEN/TC 218, CEN/TC 342 and ISO/TC 5 /SC 11.

Attention is drawn to the need for careful quality control as given in EN ISO 9000.

This standard is based on a balance of requirements given by the major national European Gas Authorities for

strip wound flexible metallic hose assemblies for the connection of domestic gas appliances.

It reflects the recognised practise and technology of the products approved today as well as the present

culture of usage by the consumer.

The introduction of new technologies supported by National Gas Authorities may require the adoption of this

standard regarding individual requirements and test.
---------------------- Page: 4 ----------------------
prEN 15070:2004 (E)
Introduction

This European Standard contains the general safety requirements relating to the safety of persons, animal

and property and the protection of their environment.
1 Scope

The objective of this European Standard is to achieve safe operation of strip wound flexible metallic gas hose

assemblies by specifying the requirements of performance, materials and test methods.

The strip wound flexible metallic gas hose assemblies as specified are suitable for the connection of domestic

appliances inside or outside a dwelling, using gas at a pressure lower than 0,5 bar.

These assemblies are designed for the use with movable appliances; they may also be used for the

connection of fixed appliances.

Where these assemblies are directly connected to a valve, such a valve shall be compatible with the strip

wound flexible metallic gas hose assembly and shall conform to prEN 15069.

The term gas relates to a first, second or third family gas as referred to in EN 437, Table 1. These gases are

commonly referred to as manufactured gases, natural gases or petroleum gases (LPG).

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 amendments) applies.
EN 437, Test gases – Test pressures – Appliance categories.

EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment.

EN 1775, Gas Supply – Gas pipework for buildings – Maximum operating pressure ≤ 5 bar – Functional

recommendations.

prEN 15069, Safety gas connection valves for metal hose assemblies used for the connection of domestic

appliances using gaseous fuels.

ISO/DIS 105-F02, Textiles – Tests for colour fastness – Part F02: Specification for cotton and viscose

adjacent fabrics.
ISO 9227, Corrosion tests in artificial atmospheres – Salt spray tests.
3 Terms and definitions

For the purposes of this European Standard, the following terms and definitions apply.

3.1
domestic appliance

appliance intended for the use by individual householders inside or outside a dwelling

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prEN 15070:2004 (E)
3.2
strip wound flexible metallic gas hose assembly

element of flexible pipe-work to be fitted between (1) the end of fixed pipework including the valve or the

socket of a quick disconnect device, and (2) the appliance inlet connection

It consists of a strip wound flexible metallic hose, its end fittings with appropriate gaskets and if required, an

armouring and/or an external protection.
3.3
strip wound flexible metallic hose

pressure-tight flexible hose made from helically wound pre-formed metallic strip, where the turns are

interconnected by single or double overlapping, sealed with a packing
3.4
end fittings

components attached to a strip wound flexible metallic hose so as to constitute a strip wound flexible metallic

gas hose assembly
3.5
screwed connection
leak-tight threaded connection
This connection can only be assembled and disassembled with an appropriate tool.
3.6
integrated non-detachable fitting

end fitting, permanently attached to the strip wound flexible metallic hose by such a method as swaging,

welding or brazing, as will ensure that it may not be detached without destruction or alteration

3.7
safety quick connection device

end fitting consisting of two parts that is designed to permit quick connection and disconnection without tools,

the assembly shall be leak-tight such that it shall prevent the release of gas from the upstream pipe work

when disconnected

This assembly shall be designed to prevent accidental disconnection and incorrect operation.

3.8
armouring

external reinforcement, partly or wholly covering the strip wound flexible metallic hose, which is designed to

improve the mechanical characteristics of the hose
3.9
external protection

any outer cover used to protect the strip wound flexible metallic hose from environmental and other outside

influences
3.10
nominal length

length of a strip wound flexible metallic gas hose assembly measured along its axis, including its end fittings,

but excluding swivel nuts

Hose assemblies incorporating the plug of a quick connection device shall be measured to the point where the

plug enters the socket in the working position.
3.11
bending radius
radius measured to the centre line of the hose
---------------------- Page: 6 ----------------------
prEN 15070:2004 (E)
3.12
restricted bending radius
bending radius, which by the use of a member is limited to a minimum value

A lower value can only be reached by permanently deforming or destroying this member.

3.13
rated flow-rate
flow rate, under standard reference conditions, at a given pressure drop
3.14
seal
gasket
packing

non metallic element assuring the tightness between two adjacent elements, be they fixed or moveable in

respect to each other
3.15
swivel joint
rotary joint

element or device that enables a continuous axial rotation of the strip wound flexible metallic hose with

respect to the gas inlet or the appliance, and which functions without reducing the gas tightness of the strip

wound flexible metallic gas hose assembly
4 Construction requirements
4.1 General

These requirements ensure that the construction of a strip wound flexible metallic gas hose assembly which,

when properly installed and correctly used, under normal chemical, mechanical and thermal conditions will

provide long term safe operation without ageing.
4.2 Nominal size

The nominal size of strip wound flexible metallic gas hose assemblies shall be designated DN 8 and DN 12

and shall be determined by the flow rate requirements given in Table 2.
4.3 Materials

The strip wound flexible metallic gas hose assembly described by this standard shall be manufactured from

materials, which shall withstand the performance and test requirements given in Clause 5. The strip wound

flexible metallic hose shall be manufactured from stabilised austenitic stainless steel or electroplated mild

steel strip. Any seal, gasket or packing made from rubber shall conform to EN 549. End fittings and non-

permanently attached parts, whether surface finished or not, shall be manufactured from stainless steel, or

from copper alloys containing at least 57 % copper and up to 3,5 % lead.

NOTE Where there may be risk of stress corrosion cracking, it is recommended that any threaded parts

manufactured from the above copper alloys shall be low temperature annealed.
4.4 Requirements for the connection between hose and fittings

The connection between the hose and the end fitting of a hose assembly as defined by this standard shall be

made by a method such as swaging, welding or brazing, resulting in an integrated non-detachable connection,

which can only be detached by irreparably damaging the hose or the end fitting. The connection shall ensure

pressure tightness and shall withstand all tests requested in Clause 5.
---------------------- Page: 7 ----------------------
prEN 15070:2004 (E)

It shall be possible to withdraw swivel nuts in order to free the sealing surface.

4.5 End fitting design requirements
The design of the end fittings shall be in accordance with 5.18.

Hoses not equipped with quick connection devices shall be equipped with at least one end fitting incorporating

a swivel nut.

The design of swivel nuts shall ensure that when used in conjunction with the appropriate seal/gasket and

appropriate matching part, leak-tightness is achieved at a maximum torque of 10 N ⋅ m and that when further

tightened to an overtorque of 50 N ⋅ m there shall be no visible deformation or cracking and it shall remain

leak-tight.

Fittings used in conjunction with swivel nuts shall incorporate a means, using standard tools, of tightening the

swivel nut without applying torsion to the hose or damage to the fitting.

Where threads are used at both ends of an assembly and there is a possibility of the assembly being installed

the wrong way round, the fittings shall be identified by different colours and the flow direction shall be marked

by the use of an arrow.

Seals / gaskets shall be from material suitable for the intended application, designed to be reusable and shall

be retained in a groove of the fitting or held in place by caps.
It is not permitted to use adaptors to reach compatibility of fittings.
4.6 Hose assembly lengths

The preferred nominal lengths of the strip wound flexible metallic gas hose assemblies shall be 0,5 m, 0,75 m,

1,0 m, 1,25 m, 1,5 m and 2,0 m. The admissible length tolerance is ± 20 mm. The maximum nominal length of

a strip wound flexible metallic gas hose assembly shall be to 2,0 m.
Hose assemblies shall not be joined together to form a hose string.
4.7 Corrosion requirements

Strip wound flexible metallic gas hose assemblies shall be resistant to any corrosive agents reasonably

foreseen in a domestic environment. If necessary the corrosion resistance of a hose assembly may be

increased by some form of external protection.
4.8 Insulation requirements

The strip wound flexible metallic hose part of a hose assembly shall be electrically insulated by an appropriate

synthetic material at potential points of contact with external metallic elements where cathodic corrosion may

take place.
4.9 Electric conductivity requirements

Strip wound flexible metallic gas hose assemblies shall be electrically continuous.

4.10 Hygiene

The strip wound flexible metallic gas hose assembly shall have an outer surface, which can be readily cleaned

by normal household means.
---------------------- Page: 8 ----------------------
prEN 15070:2004 (E)
4.11 Cover materials

If the materials of a synthetic cover contain corrosive agents as ingredients, such as sulphur or chlorine, care

shall be taken to ensure that such agents are not released during the manufacturing process or during normal

service.
5 Performance and test requirements
5.1 General

If any sample fails one of the tests within the sequence given in Table 1 then all samples will be deemed to

have failed to meet the type test requirements of this standard. Unless otherwise stated the tests are

performed under ambient conditions.
5.2 Test sequence schedule

Nine strip wound flexible metallic gas hose assemblies of 1 m length and one hose of 0,5 m length shall be

tested in the sequence given in Table 1.
---------------------- Page: 9 ----------------------
prEN 15070:2004 (E)
Table 1 — Test sequence schedule
Hose assembly No 1 2 3 4 5 6 7 8 9 10 No of
samples
Hose length in meters M 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 0,5
Initial leak-tightness test 5.3.2.2 X X X X X X X X X X 10
Strength test 5.4.2 X 1
Flow rate test 5.5.2 X 1
Electrical continuity test 5.6.2 X 1
Tension test 5.7.2 X 1
Durability of marking test 5.8.2 X 1
Ageing test 5.9.2 X 1
Salt spray test 5.10.2.1 X 1
Corrosion resistance test 5.10.2.2 X 1
with hydrochloric acid
Corrosion resistance test 5.10.2.3 X 1
against household cleaning
materials
Resistance to flame 5.11.2 X 1
Resistance to high 5.12.2 X 1
temperature
Suppleness test 5.13.2 X X X 3
Bending test restricted bend 5.14.1.2 X X X 3
radius
Flexing test 5.15.2 X X X 3
Torsion test 5.16.2 X 1
Impact resistance test 5.17.2 X 1
Fitting tests where requested 5.18
Drop test 5.18.2.2.1 X 1
Crush test 5.18.2.2.2 X 1
Torque test 5.18.3.2 X 1
Final leak-tightness test 5.3.2.3 X X X X X X X X X 9

NOTE The schedule in the above sequence chart may be subject to change during the process of drafting this

European Standard.
5.3 Leak-tightness performance
5.3.1 Requirement

The strip wound flexible metallic gas hose assembly shall be leak-tight when tested in accordance with the

methods given in 5.3.2.
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prEN 15070:2004 (E)

In the initial leak-tightness test any external protection shall remain in place. In the final leak-tightness test it

shall be determined that any external protection shall not contribute to the achievement of the given leakage

rate.

Leak-tightness performance requirements between a hose assembly and its safety quick connection device

are given in prEN 15069.
5.3.2 Test procedure
5.3.2.1 General

The strip wound flexible metallic gas hose assembly shall be tested by the following methods.

5.3.2.2 Initial leak-tightness test

When subjected to an internal air pressure of 3 bar there shall be no leakage for the first 10 s and the leakage

rate shall not exceed 10 cm /h over a period of one minute.
5.3.2.3 Final leak-tightness test

When subjected to an internal air pressure of 50 mbar with any external protection removed to within not less

than 25 mm from each end fitting there shall be no leakage for the first 10 s and the leakage rate shall not

exceed 10 cm /h over a period of one minute.
5.4 Structural strength
5.4.1 Requirement

A strip wound flexible metallic gas hose assembly shall have a structural strength capable of resisting any

environmental mechanical influence reasonably foreseen. This is regarded as being equivalent to

withstanding an internal pressure of 6 bar.
5.4.2 Test procedure

The length of the strip wound flexible metallic gas hose assembly is measured on a flat surface and recorded.

The strip wound flexible metallic gas hose assembly, one of its ends being free to move, shall be gradually

pressurised up to 6 bar. This pressure shall be maintained for at least 5 min.

The permanent elongation after release of pressure shall not exceed 3 % of the length before pressurisation.

No visual deformation of the strip wound flexible metallic hose or any other part of the assembly is permitted.

Following the test the strip wound flexible metallic gas hose assembly shall be subjected to the leak-tightness

test given in 5.3.2.3.
5.5 Flow rate
5.5.1 Requirement

The minimum flow rate through a strip wound flexible metallic gas hose assembly without the valve and when

tested as follows shall be as given in Table 2.

The flow rate shall be determined using dry air at a pressure of 20 mbar and a pressure drop of 1,0 mbar.

Measurements shall be made at an ambient pressure of 1013 mbar and at a temperature of 15 °C.

NOTE The power equivalent of the gas flowing through a hose is also influenced by the hose length, the installation

situation and the type of the gas family. In case of doubt it is recommended that the manufacturer indicates a power rating

for the application, installation, gas family and the gas appliance type for which the hose is intended.

---------------------- Page: 11 ----------------------
prEN 15070:2004 (E)
Table 2 — Flow rate requirements

Nominal size of hose assembly Overall length of hose assembly Minimum air flow rate

DN 8 1,0 m ³
0,5 m /h
DN 12 1,0 m ³
1,5 m /h
5.5.2 Test procedure

The air is supplied at constant pressure to a positive displacement inferential meter of suitable range, having

an error not greater than 5 % of the rate to be measured. The air is passed at a pressure of 20 mbar, through

a straight length of pipe connected directly to the inlet of the strip wound flexible metallic gas hose assembly,

see Figure 1. Any adapter fitted to the strip wound flexible metallic gas hose assembly shall not create an

additional pressure drop.

The pipe shall have a bore size as given in Figure 1 detail A and is to be at least 10 pipe diameters in length

with a pressure tapping five diameters upstream of the strip wound flexible metallic gas hose assembly.

Another pressure tapping is positioned five pipe diameters downstream of the strip wound flexible metallic gas

hose assembly on a similar pipe, which is also of at least 10 diameters in length. A differential pressure gauge

capable of being read directly to 0,05 mbar or less is connected as shown in Figure 1.

The air flow rate is adjusted by means of a control valve on the outlet of the pipe to give the required

differential pressure across the valve and the air temperature is maintained to ± 0,5 °C. The flow rate is

recorded and the measured values are corrected to standard conditions.

If the strip wound flexible metallic gas hose assembly has an end fitting which incorporates features that are

part of a quick connection device, and those features impair the flow, they may be eliminated for the purposes

of this test.

NOTE The flow rate of an end fitting which forms part of a safety quick connection device is tested as part of the

quick connection device under the requirements of prEN 15069.
---------------------- Page: 12 ----------------------
prEN 15070:2004 (E)
1 Adjustable governor for inlet pressure
2 Thermometer for air temperature
3 Flow meter
4 Inlet pressure gauge
5 Outlet pressure gauge
6 Differential pressure gauge
7 Hose assembly
8 Manual control tap
Figure 1 — Configuration of flow test equipment
Dimensions in millimetres
0,5
Nominal size Diameter d min
DN mm
8 9
12 15
1 4 holes 15
Figure 1 — Detail A
5.5.3 Conversion of air flow rate

Depending on the means of measurement used, the corrected rated flow rate is calculated from the following

formula:
����
������
����
d min.
d + 20
---------------------- Page: 13 ----------------------
prEN 15070:2004 (E)
d 1013,25 + p p + p 288,15
V =V • • •
r m
d 1013,25 1013,25 273,15 + t
r air
where

V is the volumetric air flow rate under reference conditions, in cubic metres per hour;

V is the volumetric air flow rate under test conditions, in cubic metres per hour;

p is the atmospheric pressure, in millibar;
p is the air supply pressure at the inlet of the meter, in millibar;
t is the air temperature at the measuring point, in degrees Celsius;
air
d is the air density (e.g. if a wet meter is used);
d is the dry air density.
If a dry meter is used, the ratio = 1.
5.6 Electric continuity
5.6.1 Requirement

The strip wound flexible metallic gas hose assembly shall be electrically continuous. The electric resistance of

an installed strip wound flexible metallic gas hose assembly shall not exceed 1 Ω/m.

5.6.2 Test procedure

A strip wound flexible metallic gas hose assembly of 1 m nominal length shall be connected between dummy

fittings representative of the gas inlet and appliance connection. These dummy fittings shall be connected for

maximum 1 min to an alternating current of 25 A supplied by a generator whose open circuit voltage does not

exceed 12 V.

The voltage drop is measured between the dummy fittings and the electric resistance is calculated from the

voltage drop and the related current. The resistance shall not exceed 1 Ω/m. The electric resistance of the

electric cables shall not be included in the measurement.
5.7 Tension
5.7.1 Requirements

A strip wound flexible metallic gas hose assembly shall be capable of withstanding an axial tension of 900 N

for size DN 12 and 600 N for size DN 8 without leakage. When under this load the assembly length shall not

increase more than 10 %. After release of the load the permanent elongation shall not exceed more than 3 %

of the original length and the strip wound flexible metallic gas hose assembly shall meet the requirements of

the leak-tightness test given in 5.3.2.3.
5.7.2 Test procedure

The strip wound flexible metallic gas hose assembly including its cover shall be attached at one end by its end

fitting to a fixed support. The other end shall be fixed to a movable part, which moves in the axis of the hose

---------------------- Page: 14 ----------------------
prEN 15070:2004 (E)

assembly. The strip wound flexible metallic gas hose assembly shall be put under tension at a rate of 100

mm/min until the value of 900 N for size DN 12 and 600 N for size DN 8 is reached.

Strip wound flexible metallic gas hose assemblies incorporating quick connection fittings shall be attached

with the quick connection at the fixed support of the test fixture. Such attachment shall be of the same kind as

used in service and the quick connection valve shall be in its open position.
During the test the hose assembly length shall not increase more than 10 %.

After the test upon visual examination there shall be no deterioration, the permanent elongation shall not

exceed 3 % and the strip wound flexible metallic gas hose assembly shall pass the requirements of the leak-

tightness test given in 5.3.2.3.
5.8 Durability of marking
5.8.1 Requirements

The marking on the strip wound flexible metallic gas hose assembly shall be permanent and withstand normal

usage and wear. If not mechanically impressed or etched in the metal parts belonging to the structure of the

strip wound flexible metallic gas hose assembly, it shall withstand the test procedure as described under 5.8.2.

5.8.2 Test procedure

A piece of cotton cloth is fixed to the end of a 16 mm diameter cylindrical slide as shown in Figure 2 in such a

way that it can be slid over the marking under a vertical load of 9 N.

The cotton cloth prepared as given below is slid 10 times in each direction over a length of 100 mm of the

marking on the hose, resulting in a total of 20 friction movements.

The test is first performed with a dry cotton cloth and followed with a cotton cloth wetted with de-mineralised

water and is performed on the same place of the marking as the previous test, resulting in a total of 40 friction

movements. The wetted cotton cloth shall have double the weight of the dry cotton cloth.

The cotton cloth utilised for this test shall be as given in ISO/DIS 105-F02. Following the above procedure

each and every character shall be readable.
---------------------- Page: 15 ----------------------
prEN 15070:2004 (E)
4 5
1 Fixation of hose
2 Slide
3 Movable
4 Hose
5 Cotton cloth
Figure 2 — Details of the durability of marking test rig
5.9 Working temperature
5.9.1 Requirements

A strip wound flexible metallic gas hose assembly shall be designed and constructed so it can safely operate

in the ambient temperatures experienced inside and outside of a dwelling.
5.9.2 Test procedure

A strip wound flexible metallic gas hose assembly complete with cover shall be placed in an oven at

100 °C ± 2 °C for 72 hours. The assembly shall then be removed, allowed to cool to room temperature, and

subjected to a visual examination. There shall be no visible cracking or deterioration other than a change of

colour of the cover.
5.10 Corrosion resistance
5.10.1 Requirements

Following the corrosion test given in 5.10.2 the strip wound flexible metallic gas hose assembly shall show no

visual sign of corrosion or other deterioration, which may influence the safe performance of the product.

Covers if fitted shall be liquid tight in order to prevent penetration of liquid under the cover and onto the strip

wound flexible metallic hose.
5.10.2 Test procedure
5.10.2.1 Salt spray test

A strip wound flexible metallic gas hose assembly of 1 m length, complete with its cover if fitted shall be

placed in a salt spray test chamber conforming to ISO 9227. The hose assembly is not under pressure. A cap

---------------------- Page: 16 ----------------------
prEN 15070:2004 (E)

shall close the hose assembly. The test chamber shall spray a saline solution having a mass concentration of

5 % (± 0,5 %) sodium chloride in distilled water. The intensity of the spray shall be such that, for each 80 cm

of the horizontal collecting surface, 2 ml (± 1 ml) of solution are collected per hour.

The test chamber shall be maintained at a temperature of 35 °C (± 1 °C). The test shall last 96 h (± 2 h).

...

SLOVENSKI STANDARD
oSIST prEN 15070:2007
01-november-2007

*LEOMLYLYDUQRVWQLNRYLQVNLFHYQLSULNOMXþNL]DSULNOMXþLWHYJRVSRGLQMVNLKSOLQVNLK

DSDUDWRY

Elastomeric packed metallic stripwound safety gas hose assemblies for the connection of

domestic appliances using gaseous fuels

Gewickelte, metallene Sicherheits-Gasschlauchlauchleitungen mit Elastomerdichtung für

den Anschluss von Haushaltsgasgeräten
Tuyaux flexibles caoutchouc agrafés pour le raccordement des appareils à usage
domestique utilisant des combustibles gazeux
Ta slovenski standard je istoveten z: prEN 15070
ICS:
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
oSIST prEN 15070:2007 en,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 15070:2007
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oSIST prEN 15070:2007
EUROPEAN STANDARD
DRAFT
prEN 15070
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2007
ICS
English Version
Elastomeric packed metallic stripwound safety gas hose
assemblies for the connection of domestic appliances using
gaseous fuels

Tuyaux flexibles caoutchouc agrafés pour le raccordement Gewickelte, metallene Sicherheits-

des appareils à usage domestique utilisant des Gasschlauchlauchleitungen mit Elastomerdichtung für den

combustibles gazeux Anschluss von Haushaltsgasgeräten

This draft European Standard is submitted to CEN members for second enquiry. It has been drawn up by the Technical Committee

CEN/TC 236.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15070:2007: E

worldwide for CEN national Members.
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oSIST prEN 15070:2007
prEN 15070:2007 (E)
Contents Page

Foreword..............................................................................................................................................................4

Introduction .........................................................................................................................................................5

1 Scope ......................................................................................................................................................5

2 Normative references ............................................................................................................................5

3 Terms and definitions ...........................................................................................................................6

4 Construction requirements...................................................................................................................8

4.1 General....................................................................................................................................................8

4.2 Nominal size ...........................................................................................................................................8

4.3 Materials .................................................................................................................................................8

4.4 Requirements for the connection between hose and fittings...........................................................8

4.5 End fittings design requirements.........................................................................................................8

4.6 EPMS hose assembly lengths..............................................................................................................9

4.7 Corrosion requirements........................................................................................................................9

4.8 Insulation requirements ........................................................................................................................9

4.9 Electric conductivity requirements......................................................................................................9

4.10 Hygiene ...................................................................................................................................................9

4.11 Cover materials......................................................................................................................................9

4.12 Dangerous substances .......................................................................................................................10

5 Performance requirements and tests ................................................................................................10

5.1 General..................................................................................................................................................10

5.2 Test sequence schedule .....................................................................................................................10

5.3 Leak-tightness......................................................................................................................................11

5.3.1 Requirements.......................................................................................................................................11

5.3.2 Test procedure.....................................................................................................................................12

5.4 Structural strength...............................................................................................................................12

5.4.1 Requirements.......................................................................................................................................12

5.4.2 Test procedure.....................................................................................................................................12

5.5 Flow rate ...............................................................................................................................................12

5.5.1 Requirements.......................................................................................................................................12

5.5.2 Test procedure.....................................................................................................................................13

5.5.3 Conversion of air flow rate .................................................................................................................15

5.6 Electric continuity................................................................................................................................15

5.6.1 Requirements.......................................................................................................................................15

5.6.2 Test procedure.....................................................................................................................................15

5.7 Tension .................................................................................................................................................15

5.7.1 Requirements.......................................................................................................................................15

5.7.2 Test procedure.....................................................................................................................................16

5.8 Durability of marking...........................................................................................................................16

5.8.1 Requirements.......................................................................................................................................16

5.8.2 Test procedure.....................................................................................................................................16

5.9 Working temperature...........................................................................................................................17

5.9.1 Requirements.......................................................................................................................................17

5.9.2 Test procedure.....................................................................................................................................17

5.10 Corrosion resistance...........................................................................................................................17

5.10.1 Requirements.......................................................................................................................................17

5.10.2 Test procedure.....................................................................................................................................18

5.11 Reaction to fire.....................................................................................................................................19

5.11.1 Requirements.......................................................................................................................................19

5.11.2 Testing and assessment methods.....................................................................................................19

5.12 Resistance to high temperature.........................................................................................................20

5.12.1 Requirements.......................................................................................................................................20

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oSIST prEN 15070:2007
prEN 15070:2007 (E)

5.12.2 Test procedure.....................................................................................................................................20

5.13 Suppleness ..........................................................................................................................................20

5.13.1 Requirements.......................................................................................................................................20

5.13.2 Test procedure.....................................................................................................................................20

5.14 Bending performance .........................................................................................................................20

5.14.1 Requirements.......................................................................................................................................20

5.14.2 Test procedure.....................................................................................................................................20

5.15 Flexing resistance ...............................................................................................................................21

5.15.1 Requirements.......................................................................................................................................21

5.15.2 Test procedure.....................................................................................................................................21

5.16 Torsion resistance...............................................................................................................................23

5.16.1 Requirements.......................................................................................................................................23

5.16.2 Test procedure.....................................................................................................................................23

5.17 Impact/crushing resistance................................................................................................................23

5.17.1 Requirements.......................................................................................................................................23

5.17.2 Test procedure.....................................................................................................................................24

5.18 Penetration resistance........................................................................................................................24

5.18.1 Requirements.......................................................................................................................................24

5.18.2 Test method .........................................................................................................................................24

5.19 End fittings...........................................................................................................................................25

5.19.1 Requirements.......................................................................................................................................25

5.19.2 Test procedures...................................................................................................................................25

5.19.3 End fittings bodies manufactured from more than one part ..........................................................26

6 Evaluation of conformity ....................................................................................................................27

6.1 General .................................................................................................................................................27

6.2 Type testing .........................................................................................................................................27

6.2.1 Initial type testing ................................................................................................................................27

6.2.2 Subsequent type testing.....................................................................................................................28

6.3 Factory production control (FPC)......................................................................................................28

6.3.1 General .................................................................................................................................................28

6.3.2 FPC requirements for all manufacturers...........................................................................................28

6.3.3 Manufacturer-specific FPC system requirements ...........................................................................30

6.4 Installation instruction........................................................................................................................31

6.5 Packaging.............................................................................................................................................32

Annex A (informative) Hose fitting design requirements for connection to the gas supply

pipework, to the pressure reduction device of portable gas bottles or to domestic

appliance ..............................................................................................................................................33

Annex B (normative) Thermal attack by a single burning item ..................................................................51

B.1 General .................................................................................................................................................51

B.2 Scope....................................................................................................................................................52

B.3 Standardised mounting and fixing ....................................................................................................52

Annex C (normative) Single-flame source test.............................................................................................53

C.1 General .................................................................................................................................................53

C.2 Scope....................................................................................................................................................54

C.3 Standardised mounting and fixing ....................................................................................................54

C.4 Test definition ......................................................................................................................................54

C.5 Test duration........................................................................................................................................54

Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU

Construction Products Directive .......................................................................................................55

ZA.1 Scope and relevant characteristics ...................................................................................................55

ZA.2 Procedure for attestation of conformity of elastomeric packed metallic stripwound safety

gas hose assemblies ...........................................................................................................................57

ZA.2.1 Systems of attestation of conformity................................................................................................57

Z.A.2.2 EC Certificate and Declaration of conformity...................................................................................59

ZA.3 CE Marking and labelling....................................................................................................................60

Bibliography......................................................................................................................................................64

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oSIST prEN 15070:2007
prEN 15070:2007 (E)
Foreword

This document (prEN 15070:2007) has been prepared by Technical Committee CEN/TC 236 “Non industrial

manually operated shut-off valves for gas and particular combinations valves-other products”, the secretariat

of which is held by UNI.
This document is currently submitted to the second CEN Enquiry.

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 89/106/EEC.

For relationship with EU Directive 89/106/EEC, see informative Annex ZA, which is an integral part of this

document.
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oSIST prEN 15070:2007
prEN 15070:2007 (E)
Introduction

This European Standard contains product characteristics relating to the safety of persons, animals and

property and the protection of their environment.

The objective of this European Standard is to achieve safe operation of elastomeric packed metallic

stripwound safety gas hose assemblies by specifying the requirements of performance, materials and test

methods.

These assemblies are designed for use with fixed applications; they may also be used for the connection of

movable applications.

This European Standard is based on a balance of requirements given by the major national European Gas

Authorities for elastomeric packed metallic stripwound safety gas hose assemblies for the connection of

domestic gas appliances.

It reflects the recognised practise and technology of products approved today as well as the present culture of

usage by the consumer.

The introduction of new technologies supported by National Gas Authorities can require the adoption of this

European Standard regarding individual requirements and tests.

Attention is drawn to the need for careful quality control as given in EN ISO 9001.

1 Scope

This European Standard specifies the requirements of performance, the material and the test methods of

elastomeric packed metallic stripwound safety gas hose assemblies for the connection of domestic appliances,

in order to achieve save operation.

The elastomeric packed metallic stripwound safety gas hose assemblies according to this European Standard

are suitable for the connection of domestic appliances inside or outside a dwelling, using gas at a pressure

lower than 0,5 bar.
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 437:2003, Test gases — Test pressures — Appliance categories.

EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment.

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 1775:1998, Gas supply — Gas pipework for buildings — Maximum operating pressure ≤ 5 bar —

Functional recommendations.

EN 10028-7, Flat products made of steels for pressure purposes – Part 7: Stainless steels.

EN 10139, Cold rolled uncoated mild steel narrow strip for cold forming – Technical delivery conditions.

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oSIST prEN 15070:2007
prEN 15070:2007 (E)

EN 10152, Electrolytically zinc coated cold rolled steel flat products for cold forming - Technical delivery

conditions.
EN 13133, Brazing — Brazer approval.
EN 13134, Brazing — Procedure approval.

EN 13501-1:2007, Fire classification of construction products and building elements — Part 1: Classification

using data from reaction to fire tests.

EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to the

thermal attack by a single burning item.

prEN 15069:2004, Safety gas connection valves for metal hose assemblies used for the connection of

domestic appliances using gaseous fuel.
EN ISO 9001:2000, Quality management systems — Requirements (ISO 9001:2000).

EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227:2006).

EN ISO 11925-2, Reaction to fire tests — Ignitability of building products subjected to direct impingement of

flame — Part 2: Single-flame source test (ISO 11925-2:2002).

EN ISO 15465, Pipework – Stripwound metal hoses and hose assemblies (ISO 15465:2004).

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
domestic appliance

appliance intended for use by individual householders inside or outside a dwelling

3.2
elastomeric packed metallic stripwound safety gas hose assembly

element of flexible pipe-work to be fitted between the gas supply valve or the socket of a quick disconnect

device and the appliance inlet connection, consisting of an elastomeric packed metallic stripwound hose, its

end fittings with appropriate gaskets and, if required, an armouring and/or an external protection

3.3
EPMS hose assembly

abbreviation used in this European Standard to denote an elastomeric packed metallic stripwound safety gas

hose assembly as defined in 3.2
3.4
elastomeric packed metallic stripwound hose

hose manufactured from a helically wound preformed strip, generally with a right-hand lead where the turns,

with packing, are connected together by single or double overlapping and flexibility is obtained by sliding

adjacent turns over each other
3.5
end fittings

components attached to an elastomeric packed metallic stripwound hose so as to constitute an EPMS hose

assembly
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oSIST prEN 15070:2007
prEN 15070:2007 (E)
3.6
screwed connection

leak-tight threaded connection, which can only be assembled and disassembled with an appropriate tool

3.7
integrated non-detachable fitting

end fitting, permanently attached to the elastomeric packed metallic stripwound hose by such a method as

swaging, welding or brazing, so as to ensure that it can not be detached without destruction or alteration

3.8
safety quick connection device

end fitting consisting of two parts that is designed to permit quick connection and disconnection without tools,

leak-tight so that it prevents the release of gas from the upstream pipe work when disconnected and designed

to prevent accidental disconnection and incorrect operation
3.9
armouring

external reinforcement, partly or wholly covering the elastomeric packed metallic stripwound hose, which is

designed to improve the mechanical characteristics of the hose
3.10
external protection

outer cover used to protect the elastomeric packed metallic stripwound hose from environmental and other

outside influences
3.11
nominal length

length of an EPMS hose assembly measured along its axis, including its end fittings, but excluding any swivel

nuts.

EPMS hose assemblies incorporating the plug of a quick connection device are measured to the point where

the plug enters the socket in the working position
3.12
restricted bending radius

bending radius, which by adjacent turns of the elastomeric packed metallic stripwound hose coming into

contact with each other is limited to a minimum value measured to the centre line of the hose.

A lower value can only be reached by permanently deforming or destroying the adjacent turns

3.13
rated flow-rate
flow rate, under standard reference conditions, at a given pressure drop
3.14
seal
gasket
packing

non metallic element assuring leak-tightness between two adjacent elements, be they fixed or moveable in

respect to each other
3.15
swivel joint
rotary joint

element or device that enables a continuous axial rotation of the hose with respect to the gas inlet or the

appliance, and which functions without reducing the leak-tightness of the flexible connection

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oSIST prEN 15070:2007
prEN 15070:2007 (E)
3.16
gas
first, second and third family gas as referred to in EN 437:2003, Table 1.

These gases are commonly referred to as manufactured gases, natural gases or liquefied petroleum gases

(LPG)
4 Construction requirements
4.1 General

These requirements shall ensure that the construction of an EPMS hose assembly which, when properly

installed and correctly used, under normal chemical, mechanical and thermal conditions will provide long term

safe operation without degradation.
4.2 Nominal size

The nominal size of EPMS hose assemblies shall be designated either DN 8 or DN 12 and shall be

determined by the flow rate requirements given in Table 2. For the purpose of this European Standard, DN 10

and DN 15 fittings shown in Annex A are considered as DN 8 and DN 12 respectively.

4.3 Materials

The EPMS hose assembly described by this European Standard shall be manufactured from materials which

shall withstand the performance and test requirements given in Clause 5. The elastomeric packed metallic

stripwound hose shall be manufactured from metal(s) no less durable and robust than stainless steel strip

conforming to EN 10028-7 or mild steel strip conforming to EN 10139 and electroplated according to

EN 10152 and fulfil in addition to the requirements of this European Standard the requirements of

EN ISO 15465. Any seal, gasket or packing shall conform to EN 549. End fittings and non-permanently

attached parts, whether surface finished or not, shall be manufactured from stainless steel, or from copper

alloys containing at least 57 % copper and up to 3,5 % lead.

Where there may be risk of stress corrosion cracking, any threaded parts manufactured from the above

copper alloys shall be stress relieved.
4.4 Requirements for the connection between hose and fittings

The connection between the elastomeric packed metallic stripwound hose and the end fitting of an EPMS

hose assembly as defined by this European Standard shall be made by a method such as swaging, welding or

brazing, resulting in an integrated non-detachable connection, which can only be detached by irreparably

damaging the hose or the end fitting. The connection shall ensure leak-tightness and shall withstand all tests

requested in Clause 5.
...

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