oSIST prEN 15070:2007
(Main)Elastomeric packed metallic stripwound safety gas hose assemblies for the connection of domestic appliances using gaseous fuels
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
Diese Europäische Norm legt die Anforderungen an die Gebrauchstauglichkeit, die Werkstoffe und die Prüfverfahren von gewickelten, metallenen Sicherheits-Gasschlauchleitungen mit Elastomerdichtung für den Anschluss von Haushaltsgeräten fest, um ihre sichere Funktion zu erreichen.
Die nach diesem Dokument spezifizierten gewellten, metallenen Gasschlauchleitungen können für den Anschluss von Haushaltsgasgeräten im Inneren oder außerhalb von Wohnungen bei einem Gasdruck von weniger als 0,5 bar eingesetzt werden.
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
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
DRAFT
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.
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
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
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.
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.
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
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
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. Welding and brazing processes shall conform to EN 1418, EN 13134 and EN 13133.
It shall be possible to withdraw swivel nuts in order to free the sealing surface.
4.5 End fittings design requirements
End fittings shall be manufactured from materials that permit the EPMS hose assembly to comply with the
performance requirements of this European Standard for a reasonable economic working life when tested
according to Table 1.
The design of end fittings shall be in accordance with 5.19.
An EPMS hose assembly shall be fitted either with a swivel nut on one end or a swivel joint.
The design of swivel nuts shall ensure that when used in conjunction with its seal/gasket and its matching part,
tightness is achieved at a maximum torque of (10 ± 0,5) N ⋅ m and that when further tightened to a torque of
(50 ± 2,5) N ⋅ m there shall be no visible deformation or cracking and the connection shall remain gas tight.
Fittings used in conjunction with swivel nuts shall incorporate a means to hold the fitting during the tightening
of 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 their intended application. They shall be designed to be
reusable and shall be retained on the fitting or held in place by caps and shall comply with the requirements of
EN 549.
Screwed connections shall be capable of being assembled and disassembled only by using an appropriate
tool without visible damage to the fitting.
4.6 EPMS hose assembly lengths
The normal nominal lengths of the EPMS 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 shall be ± 20 mm. The maximum nominal length of an EPMS hose
assembly shall be 2,0 m.
NOTE EPMS hose assemblies according to this European Standard are not designed to be joined together to form a
hose string.
4.7 Corrosion requirements
EPMS hose assemblies shall be resistant to any corrosive agents reasonably foreseen in a domestic
environment.
NOTE If required the corrosion resistance of an EPMS hose assembly can be increased by some form of external
protection.
4.8 Insulation requirements
The elastomeric packed metallic stripwound hose part of an EPMS hose assembly shall be electrically
insulated externally by the use of an appropriate synthetic material at potential points of contact with metallic
elements where cathodic corrosion can take place.
4.9 Electric conductivity requirements
EPMS hose assemblies shall be electrically continuous along their length.
4.10 Hygiene
EPMS hose assemblies shall have an outer surface, which can be readily cleaned by normal household
means.
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.
4.12 Dangerous substances
Materials used in EPMS hose assemblies shall not release any dangerous substances in excess of the
maximum permitted levels specified in a relevant European Standard for the material or permitted in the
national regulations of the member state of destination.
5 Performance requirements and tests
5.1 General
If any sample fails one of the tests within the test sequence schedule given in Table 1 then all samples shall
be deemed to have failed to meet the type test requirements of this European Standard. The tests are
performed under ambient conditions. If not otherwise indicated the following tolerances shall apply:
atmospheric pressure: (± 0,1) mbar air pressure: (± 5) %
flow rate: (± 5) % ambient temperature: (± 1) °C
temperature above 125 °C: (± 10) °C time: (± 0,1) %
dimensions: (± 0,1) mm
5.2 Test sequence schedule
For each DN, nine EPMS hose assemblies of 1 m length, three of 1,5 m length and five of 0,5 m length shall
be tested in the sequence given in Table 1.
Table 1 — Test sequence schedule
Hose assembly No 1 2 3 4 5 6 7 8 9 10 16 17 No of
to samples
Hose length in metres 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 0,5 0,5 0,5
+
1,5
Initial leak-tightness test 5.3.2.2 X X X X X X X X X X X X 17
Structural 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
Working temperature test 5.9.2 X X 2
Salt spray test 5.10.2.1 X 1
Hydrochloric acid test 5.10.2.2 X 1
Household cleaning agent 5.10.2.3 X 1
test
Reaction to fire 5.11.2 X 3 +3
Fire resistance test 5.12.2 X 1
Suppleness test 5.13.2 X 1
Bending performance test 5.14.2 X X X 3
Flexing test 5.15.2 X X X 3
Torsion test 5.16.2 X 1
Impact resistance test 5.17.2 X 1
Penetration test 5.18.2 X
Fitting tests where requested 5.19
Drop test 5.19.2.1 X 1
Crush test 5.19.2.2 X 1
Torque test 5.19.3.2 X 1
Final leak-tightness test 5.3.2.3 X X X X X X X X X X 10
5.3 Leak-tightness
5.3.1 Requirements
The EPMS hose assembly shall be leak-tight when tested in accordance with the methods given in 5.3.2.
In the initial leak-tightness test any external protection shall remain in place. In the final leak-tightness test for
type testing only it shall be demonstrated that any external protection does not contribute to the achievement
of the given leakage rate.
The verification of gas leak-tightness after installation of the EPMS hose assembly and its connecting parts
shall be in accordance with the manufacturer’s installation instructions.
Leak-tightness requirements between an EPMS hose assembly and its safety quick connection device shall
be as prEN 15069:2004, 5.4.
5.3.2 Test procedure
5.3.2.1 General
The EPMS hose assembly shall be tested by the following methods.
5.3.2.2 Initial leak-tightness test
When held under water and containing air at a pressure of 3 bar the leakage rate of the EPMS hose assembly
shall not exceed 10 cm /h.
-3
NOTE A leakage rate not exceeding (7 × 10 ) mbar l/s is equivalent to the above requirement.
5.3.2.3 Final leak-tightness test
When held under water and containing air at a pressure of 50 mbar the leakage rate of the EPMS hose
assembly shall not exceed 10 cm /h.
In the final leak-tightness test for type testing it shall be verified that any external protection has not
contributed to the achievement of the above leakage rate by removing a cover to within not less than 25 mm
from each end fitting.
5.4 Structural strength
5.4.1 Requirements
An EPMS hose assembly shall have a structural strength capable of resisting any environmental mechanical
influence reasonably foreseen. This shall be regarded as being equivalent to withstanding an internal pressure
of 6 bar.
5.4.2 Test procedure
The length of the EPMS hose assembly shall be measured on a flat surface and recorded. The EPMS 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 of the EPMS hose assembly after release of pressure shall not exceed 3 % of its
length before pressurisation. With the exception of the permanent elongation, no visual deformation of the
elastomeric packed metallic stripwound hose or any other part of the assembly shall be permitted.
Following the test the EPMS hose assembly shall be subjected to the leak-tightness test given in 5.3.2.3.
5.5 Flow rate
5.5.1 Requirements
The minimum flow rate through an EPMS 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 at the given pressure drop in Table 2.
Measurement shall be converted to standard conditions of a pressure of 1 013,25 mbar and a temperature of
15 °C.
Table 2 — Flow rate requirements
Nominal size of hose Overall length of hose Minimum air flow rate for Minimum air flow rate for
assembly assembly gases other than Type L gas Type L with a pressure
with a pressure drop of drop of 0,5 mbar
1 mbar
DN 8 1,0 m 3 3
0,5 m/h 0,55 m /h
DN 12 1,0 m 3 3
1,5 m/h 1,2 m /h
The power equivalent of the gas flowing through an EPMS hose assembly is also influenced by the hose
length and the type of the gas family. The manufacturer shall indicate for each length the minimum power
rating relating to the individual gas family.
NOTE Type L gas is a low calorific gas as defined in EN 437:2003, Table 1.
5.5.2 Test procedure
Air shall be supplied at constant pressure to a positive displacement differential meter of suitable range,
having an error not greater than 5 % of the rate to be measured. The air shall be passed at a pressure of
20 mbar, through a straight length of pipe connected directly to the inlet of the EPMS hose assembly, see
Figure 1a. Any additional pressure drop created by adapters fitted to the EPMS hose assembly shall be
deducted from the measured value.
The pipe shall have a bore size as given in Figure 1b, detail A, and is to be at least 10 pipe diameters in
length with a pressure tapping five diameters upstream of the EPMS hose assembly. Another pressure
tapping is positioned five pipe diameters downstream of the EPMS 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 1a.
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 EPMS hose assembly and the air temperature is maintained to ± 0,5 °C. The
flow rate shall be recorded and corrected to standard conditions of 1 013,25 mbar and 15 °C.
If the EPMS 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.
Key
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 EPMS hose assembly
8 Manual control valve
Figure 1a — Configuration of flow test equipment
Dimensions in millimetres
φ
0,5
-
Key
1 4 holes ø 1,5 mm
Nominal size Diameter d min
DN mm
8 9
12 15
Figure 1b — Detail A
Figure 1 — Flow test equipment
����
������
����
d min.
d min. + 20
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
equation:
p + p
d 1013,25+ p 288,15
a
V =V • • • (1)
r m
d 1013,25 1013,25 273,15+ t
r air
where
V is the volumetric air flow rate under reference conditions, in m /h;
r
V is the volumetric air flow rate under test conditions, in m /h;
m
p is the atmospheric pressure, in mbar;
a
p is the air supply pressure at the inlet of the meter, in mbar;
t is the air temperature at the measuring point, in °C;
air
d is the density of air used (e.g. if a wet meter is used);
d is the dry air density.
r
d
If a dry meter is used, the ratio = 1.
d
r
5.6 Electric continuity
5.6.1 Requirements
The EPMS hose assembly shall be electrically continuous. The electric resistance of an installed EPMS hose
assembly shall not exceed 1 Ω/m.
5.6.2 Test procedure
An EPMS hose assembly of 1 m nominal length shall be connected between copper dummy fittings
representative of the gas inlet and appliance connection. These dummy fittings shall be connected for a
maximum of 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 shall be measured between the dummy fittings and the electric resistance shall be
calculated from the voltage drop and the related current. The resistance shall not exceed 1 Ω/m, measured
with an accuracy of ± 2 %. The electric resistance of the electric cables shall not be included in the
measurement.
5.7 Tension
5.7.1 Requirements
An EPMS hose assembly shall withstand an axial tension of 1 000 N without leakage. When under this load
the assembly length shall not increase by more than 10 %. After release of the load the permanent elongation
shall not exceed more than 3 % of the original length and the EPMS hose assembly shall meet the
requirements of the leak-tightness test given in 5.3.2.3.
5.7.2 Test procedure
The EPMS hose assembly, including its cover if fitted, 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 EPMS hose assembly.
The EPMS hose assembly shall be put under tension until the value of 1 000 N is reached. The test rig shall
have a feed rate of (100 ± 5) mm/min. The tension value of 1 000 N shall be maintained for 5 min.
EPMS 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 EPMS 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 EPMS hose assembly shall pass the leak-tightness test given in 5.3.2.3.
5.8 Durability of marking
5.8.1 Requirements
The marking on the EPMS hose assembly shall be permanen
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.