SIST EN 15266:2025

SLOVENSKI STANDARD
01-marec-2025
Upogljivi valoviti cevni kompleti iz nerjavnega jekla za plinske napeljave z
delovnim tlakom do 0,2 MPa (2 bara)
Stainless steel pliable corrugated tubing kits for gas installation pipework with an
operating pressure up to 0,2 MPa (2 bar)
Nichtrostende biegbare Wellrohrbausätze für Gasleitungsanlagen mit einem
Arbeitsdruck bis 0,2 MPa (2 bar)
Kits de tuyaux onduleux pliables en acier inoxydable pour les installations intérieures à
gaz avec une pression de service inférieure ou égale à 0,2 MPa (2 bar)
Ta slovenski standard je istoveten z: EN 15266:2024
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.

EN 15266
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN 15266:2007
English Version
Stainless steel pliable corrugated tubing kits for gas
installation pipework with an operating pressure up to
0,2 MPa (2 bar)
Kits de tuyaux onduleux pliables en acier inoxydable Nichtrostende biegbare Wellrohrbausätze für
pour les installations intérieures de gaz avec une Gasleitungsanlagen mit einem Arbeitsdruck bis
pression de service inférieure ou égale à 0,2 MPa 0,2 MPa (2 bar)
(2 bar)
This European Standard was approved by CEN on 18 November 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N

EUROPÄISCHES KOMITEE FÜR NORMUN G

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15266:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 7
4 Design requirements . 9
4.1 General. 9
4.2 Nominal size DN, wall thickness and pressure drop . 10
4.3 Threads . 10
4.4 PLT fittings . 10
4.5 Seals . 11
4.6 Supports . 11
4.7 Electrical conductivity requirements . 11
4.8 Cover . 11
4.9 Additional protection . 12
4.10 Environment . 12
5 Performance and test requirements. 12
5.1 General. 12
5.2 Tightness . 16
5.3 Dimensional check . 17
5.4 Bending performance . 17
5.5 Crushing resistance . 18
5.6 Stability under pressure . 20
5.7 Wear resistance of outer cover . 20
5.8 Structural strength test . 21
5.9 Impact resistance . 21
5.10 Penetration resistance . 22
5.11 Resistance to pull out . 23
5.12 Chemical resistance . 23
5.13 Low temperature resistance . 26
5.14 Ageing . 26
5.15 Tightness in case of fire . 28
5.16 Reaction to fire. 29
5.17 Electrical conductivity . 29
5.18 Pressure drop . 30
5.19 Maximum load for admissible deformation of PLT support . 36
5.20 Dangerous substances. 37
6 Assembly and installation instruction . 38
6.1 Instructions . 38
6.2 Marking, labelling and packaging . 39
Annex A (normative) Single-flame source test . 41
A.1 General. 41
A.2 Standardized mounting and fixing . 41
A.3 Test definition . 41
A.4 Test duration . 41
Annex B (normative) Thermal attack by a single burning item . 43
Annex C (informative) Factory Production Control . 44
C.1 General . 44
C.2 FPC recommendations for all manufacturers . 44
C.3 Manufacturer’s specific FPC system recommendations . 45
Bibliography . 47
European foreword
This document (EN 15266:2024) has been prepared by Technical Committee CEN/TC 342 “Metal hoses,
hose assemblies, bellows and expansion joints”, the secretariat of which is held by SNV.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15266:2007.
In comparison with the previous edition, the following technical modifications have been made:
— operating pressure up to 0,2 MPa (2 bar).
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
This document contains the general safety requirements relating to the safety of persons, animals, and
property and the protection of their environment.
The requirements of this document concern designers, manufacturers, suppliers and importers of
stainless steel pliable corrugated gas tubing kits for gas installation pipework.
Installation and mandatory strength and tightness tests before commissioning should consider the local
application regulations where they exist.
This document is applicable to:
— new installation pipework;
— replacements of existing installations; or
— extensions to existing installations.
Stainless steel pliable corrugated gas tubing kits can be used in conjunction with other approved gas
pipework.
This document defines performance requirements for the products to be placed on the European
Economic Area EEA.
1 Scope
This document specifies the requirements for material, design, manufacture, testing, marking and
documentation of stainless steel pliable corrugated gas tubing kits for gas installation pipework with a
maximum allowable pressure (PS):
— less than or equal to 0,5 bar within a nominal size range from DN 10 to DN 50 (class 1); and
— less than or equal to 2 bar within a nominal size range from DN 10 to DN 25 (class 2).
This document applies to stainless steel pliable corrugated gas tubing kits used for 1st, 2nd and 3rd family
gases (see EN 437) in residential, commercial and industrial gas installations to be installed outdoors or
indoors at a temperature range from –20 °C to +60 °C.
This document does not apply to:
— pliable tubing without cover;
— corrugated safety metal hose assemblies for connection to moveable appliances.
NOTE This document does not cover the installation aspects of stainless steel pliable corrugated gas tubing
kits.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1363-1:2020, Fire resistance tests — Part 1: General requirements
EN 1775:2007, Gas supply — Gas pipework for buildings — Maximum operating pressure less than or equal
to 5 bar — Functional recommendations
EN 10028-7, Flat products made of steels for pressure purposes — Part 7: Stainless steels
EN 10088-3, Stainless steels — Part 3: Technical delivery conditions for semi-finished products, bars, rods,
wire, sections and bright products of corrosion resistant steels for general purposes
EN 10226-1, Pipe threads where pressure tight joints are made on the threads — Part 1: Taper external
threads and parallel internal threads — Dimensions, tolerances and designation
EN 10242, Threaded pipe fitting in malleable cast iron
EN 12164, Copper and copper alloys — Rod for free machining purposes
EN 12165, Copper and copper alloys — Wrought and unwrought forging stock
EN 13501-1:2018, 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
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation (ISO 228-1)
EN ISO 6509-1, Corrosion of metals and alloys — Determination of dezincification resistance of copper
alloys with zinc — Part 1: Test method (ISO 6509-1)
EN ISO 7369:2020, Pipework — Metal hoses and hose assemblies — Vocabulary (ISO 7369:2020)
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227)
EN ISO 10380:2012, Pipework — Corrugated metal hoses and hose assemblies (ISO 10380:2012)
EN ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame
— Part 2: Single-flame source test (ISO 11925-2)
ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance
3 Terms, definitions and abbreviations
For the purposes of this document, the terms and definitions given in EN ISO 7369:2020 and
EN 1775:2007, and the following apply.
3.1
pliable tubing
PLT
corrugated tubing capable of being bent easily by hand a limited number of times, incorporating an outer
cover applied by the manufacturer at the time of production
3.2
PLT kit
pliable tubing with its related components obtained or specified from one manufacturing entity having
design and performance responsibility for the kit
3.3
bend radius
radius measured to the centre line of the pliable tubing
3.4
PLT fitting
unique fitting using mechanical attachment methods, in which tightness is achieved with or without seals,
excluding other joining methods such as welding, brazing, soldering or gluing
3.4.1
end fitting
PLT fitting intended to join pliable tubing to an external component
3.4.2
coupling
PLT fitting intended to join two sections of pliable tubing
3.4.3
tee
PLT fitting to join three sections of pliable tubing
3.4.4
manifold
PLT fitting designed to join 4 or more sections of pliable tubing
3.5
seal
any part intended to provide tightness within a PLT fitting
3.6
additional protection
outer sheath intended to protect the connection between the pliable tubing and a PLT fitting or eventual
damage occurred to the cover during or after installation of the pliable tubing from corrosion or
mechanical damage
Note 1 to entry: This sheath has the same chemical resistance as the cover.
EXAMPLE Wrapping tape or heat shrink tube
3.7
PLT support
element used to attach the PLT kit to the structure of the building
3.8
rated flow rate
flow rate at a given pressure drop, under standard reference conditions
3.9
family
group of products produced by one manufacturer for which test results for one product of that group are
representative of characteristics for the whole group
3.10
1st, 2nd and 3rd family gases
group of gaseous fuels with similar burning behaviour linked together by a range of Wobbe indices
Note 1 to entry: See EN 437:2021, Table 1.
Note 2 to entry: These gases are commonly referred to as manufacturer gases, natural gas and liquified petroleum
gases.
[SOURCE: EN 437:2021, 3.18, modified with Note 2 to entry]
3.11
installation pipework
pipework downstream of the point of gas delivery terminating at the appliance inlet connection
3.12
cover
tubular outer sheath applied to the corrugated pipe by the manufacturer and intended to improve the
resistance of the pipe to external corrosion and mechanical damage
3.13
maximum allowable pressure
PS
maximum pressure for which the equipment is designed, as specified by the manufacturer, and defined
at a location specified by him
4 Design requirements
4.1 General
4.1.1 Additional components
Where additional components are required to complete the PLT kit, these components shall be provided
or specified by the kit manufacturer.
4.1.2 Materials
The material for the pliable tubing (see Table 1) shall be austenitic stainless steel and the grade shall be
chosen according to long term suitability for the gas conveyed, the environment, the conditions under
which it will be used and the suitability for fabrication, e.g. welding, cold forming, etc. as appropriate. Due
regard shall be taken of the quality of the gas conveyed, possible variation in the composition, and
possible development of corrosive agents both internally and externally.
NOTE 1 Examples of possible corrosive agents include:
— internal: combinations of sulphur, oxygen, moisture, etc.;
— external: coastal and general environmental influence, building materials, etc.
NOTE 2 The material of the pliable tubing directly affects the safety of the works (building and civil engineering)
in which the tubing kit is installed and the durability performance of the tubing kit itself.
4.1.3 Cover, PLT fittings and PLT supports
PLT fittings shall provide a gas-tight connection to the pliable tubing. PLT fittings, whether surface
finished or not, shall be manufactured from materials listed in Table 1.
Table 1 — Materials
Component Material
Austenitic Stainless steel according to EN 10028-7: 1.4306, 1.4404, 1.4401, 1.4541,
Pliable tubing
1.4571
a
Cover Synthetic material
Additional
b
Synthetic material
protection
Stainless steel according to EN 10088-3, copper alloys according to EN 12164 and
PLT fittings
c
EN 12165
Stainless steel according to EN 10088-3, copper alloys according to EN 12164 and
c
EN 12165
PLT
manifold/tees
Malleable cast iron according to EN 10242 types W 400-05; W 350-04; B 350-10 or
B 300-06
Supports Metallic corrosion resistant material
a
see 4.8
b
see 4.9
c
A material containing at least 57 % copper and not more than 3,5 % lead for copper PLT fittings, PLT
manifolds and tees is an example of the percentages presenting an appropriate resistance against stress
corrosion cracking and dezincification.
The choice of material for pliable tubing should relate to the composition of the gas conveyed and the
external environment (see Table 2, adapted extract from EN ISO 10380:2012).
Table 2 — Typical classification of materials for corrosion resistance
Corrosion Description Material Grade Examples
Resistance Class
1.4306
Basic corrosion
A Stainless steels
resistance
1.4541
1.4404
Good corrosion
B Mo-alloyed stainless steels 1.4401
resistance
1.4571
NOTE For example, the addition of biogas can increase oxygen and moisture content.
4.2 Nominal size DN, wall thickness and pressure drop
The nominal size of a PLT kit shall be selected from the DN given in EN ISO 10380:2012, Table 1.
The nominal size range shall be from DN 10 to DN 50.
The minimum bore size of the pliable tubing shall be at least 98 % of the nominal size DN in mm.
The manufacturer shall declare the related pressure drop (see 5.18) for each nominal size DN (see 5.3).
For direct burial if not stipulated in local installation standards, the minimum wall thicknesses values as
included in the following Table 3 shall apply.
Table 3 — Nominal size DN, min. inner diameter and min. wall thickness
DN 10 DN 12 DN 15 DN20 DN25 DN32 DN40 DN50
Min. inner diameter (mm) 9,8 11,8 14,7 19,6 24,5 31,4 39,2 49,0
Min. wall thickness (mm) 0,18 0,18 0,20 0,25 0,25 0,30 0,30 0,30
4.3 Threads
Male end fittings shall have terminating threads according to EN 10226-1 or any national standard.
Male or female end fittings shall have terminating threads according to EN ISO 228-1 or any national
standard.
Integrated threads within the mechanical attachment of the PLT fittings shall not be compatible for
EN 10226-1 nor EN ISO 228-1.
4.4 PLT fittings
4.4.1 General
PLT fittings shall provide a gas-tight connection to the pliable tubing. PLT fittings, whether surface
finished or not, shall be manufactured from materials listed in Table 1. Copper alloys shall be selected
from EN 12164 and/or EN 12165 and shall contain at least 57 % copper and not more than 3,5 % lead.
4.4.2 Stress corrosion
All fittings and components of copper alloy shall be resistant to stress corrosion.
Stress corrosion resistance shall be determined in accordance with ISO 6957 (pH 9,5) or any more
stringent national standard.
4.4.3 Dezincification
All copper alloys components shall resist dezincification.
If an alloy contains more than 10 % of zinc, its corrosion behaviour shall be assessed according to
EN ISO 6509-1.
4.5 Seals
Where seals and sealing materials for metallic threaded joints are used in the PLT kit, they shall be
suitable for gas and selected from the appropriate European Standards when permitted by the national
regulation or technology e.g. EN 549, EN 682, EN 751-1, EN 751-2 and EN 751-3 and taking into account
the different temperature ranges.
PLT kit components shall be resistant to any corrosive agent reasonable foreseen in the field of the
declared intended use.
They shall be durable to climatic conditions according to 5.14.
4.6 Supports
Supports shall be made of materials mechanically and chemically nonaggressive with the other
components of the PLT kit with which they are in contact.
Supports shall be designed to carry the designed load for a minimum of 30 min in case of fire. The
standard temperature/time curve shall be as given in EN 1363-1:2020, Figure 7.
The manufacturer shall supply installations instructions that give the correct support design for the kit
supplied. The instructions shall also emphasize the need to design the support fixings to the structure in
such a way that maintains the integrity of the system in case of fire for a period not less than the period
for which the supports are designed to carry the system load.
4.7 Electrical conductivity requirements
PLT kit components shall be electrically conductive, see 5.17.
The manufacturer should advise in his installation instructions that equipotential bonding should be in
accordance with local application regulations.
4.8 Cover
The cover shall satisfy the tests according to 5.4, 5.7, 5.12, 5.13, 5.14 and 5.16.
If the materials of the cover contain corrosive agents or ingredients such as sulphur or chlorine, such
agents shall not be released during manufacturing process or during intended service conditions.
The cover shall be a synthetic polymer or elastomer with a total chloride content not exceeding 50 ppm.
For direct burial if not stipulated in local installation standards, the cover shall have a minimum thickness
of 0,5 mm.
For the purpose of safety, the prevailing colour of the cover shall be: yellow, e.g. RAL 1004, 1016, 1018.
4.9 Additional protection
The additional protection must be convenient to the specifications of the manufacturer.
The additional protection shall satisfy the tests according to 5.12, 5.13, and 5.14.
The additional protection shall be a synthetic polymer or elastomer with a total chloride content not
exceeding 50 ppm.
If the additional protection is a heat shrink tube, the tube shall have a minimum thickness of 0,5 mm after
shrinkage.
If the additional protection is a wrapping tape, the finished thickness on the applied area shall be
minimum 0,5 mm.
The manufacturer of the PLT-kit shall supply installation instructions that specifies the overlap to be
applied for the tape or the maximum temperature for the shrinkable tube.
For the purpose of safety, the prevailing colour of the additional protection shall be: yellow, e.g. RAL 1004,
1016, 1018.
4.10 Environment
PLT kit components shall be resistant to any corrosive agent reasonably foreseen in the conditions of the
declared intended use.
They shall be durable to climatic conditions according to 5.14.
They shall withstand a temperature range of –20 °C to 60 °C.
In case any country needs a lower temperature class, it should be specified by the country;
The manufacturer should advise in his installation instructions that, where exposed, sections of PLT kits
can be protected against excessive mechanical force that can cause damage. Casing/trunking can be used
to fulfil this requirement.
5 Performance and test requirements
5.1 General
5.1.1 Introduction
The number and the type of PLT kit samples to be tested, the tests and the compliance criteria shall be as
given in the following Table 4.
Initial type testing shall be performed on samples of PLT kits representative of the manufactured types,
and shall be chosen at random from either a production lot, or in the absence of available lots assemblies
representative of the production from the market.
Unless otherwise specified, the number and type of samples of PLT kits to be tested, the tests and
compliance criteria are as given in Table 4.
Table 4 — Number of units and compliance criteria for initial testing
Type test Nominal Requirement Sample Quantity Assessment Compliance criteria
size or clause type method
families
to be
tested
Bending
All sizes 5.4.1 1 2 5.4.2 Tightness
performance
Crushing Tightness, maximum
All sizes 5.5.1 1 4 5.5.2
resistance deformation
Stability under Tightness, elongation
All sizes 5.6.1 1 1 5.6.2
pressure level
Wear resistance
All sizes 5.7.1 see 5.7 1 5.7.2 No full penetration
of outer cover
Structural
All sizes 5.8.1 1 1 5.8.2 Tightness
strength
Impact Tightness, maximum
X / Y / Z 5.9.1 2 1 5.9.2
resistance deformation
Penetration Tightness, maximum
All sizes 5.10.1 1 1 5.10.2
resistance deformation
Resistance to
All sizes 5.11.1 1 1 5.11.2 Tightness
pull out
Chemical Tightness, no
Y 5.12.1 2 3 5.12.2
resistance detrimental effect
Low
Tightness, no
temperature Y 5.13.1 2 1 5.13.2
detrimental effect
resistance
Tightness, no
Ageing X / Z 5.14.1 2 2 5.14.2
detrimental effect
Tightness in Permissible leakage
X / Y / Z 5.15.1 2 2 5.15.2
case of fire level
Euroclass
Reaction to fire X / Z 5.16.1 see Annexes A and B
classification
Electrical
X / Y / Z 5.17.1 2 2 5.17.2 -
conductivity
see see see
Tables Tables Tables Pressure drop
Pressure drop 5.18.1 5.18.3
12 and 12 and 12 and statement
13 13 13
Maximum load
Admissible
for admissible X / Z 5.19.1 - 2 5.19.2
deformation
deformation
The results of all tests shall be recorded and held by the manufacturer for at least 10 years.
If any nominal size fails one of the tests within the test sequence schedule given in 5.1.3, Table 6, then all
samples of that nominal size will be deemed to have failed to meet the type test requirements of this
document.
Unless otherwise specified in this document:
— all dimensions shall be in mm;
— the tests shall be carried out with the cover in place;
— the tests performed will qualify the other sizes in the same family as specified in Table 5.
Tests results shall only apply to components of the same design and same material.
Table 5 — Test requirements
Nominal size Family Qualified diameters DN
a
to be tested
DN 12 X DN 10 - DN 12 - DN 15
DN 25 Y DN 20 - DN 25 - DN 32
DN 50 Z DN 40 - DN 50
a
If these sizes are not available, the largest DN in the relevant family shall be tested.
The tests shall be performed under ambient conditions. If not otherwise indicated, the following
tolerances shall apply:
— atmospheric pressure: (±0,1) mbar;
— flow rate: (±3) %;
— temperature above 125 °C: (±10) °C;
— dimensions: (±0,1) mm;
— air pressure: (±5) %;
— ambient temperature: (±1) °C;
— time: (±0,1) %;
— sample length: (–1/+3) %.
5.1.2 Type of PLT kit samples
The PLT kit samples used in the following tests shall be assembled in accordance with the manufacturers’
instructions (with additional protection applied for the tests according to 5.12, 5.13 and 5.14)
If the installation instruction of the manufacturer prescribes both; wrapping tape or heat shrink tube as
an additional protection; then both shall not be mixed on the same sample. The quantity of PLT kit
samples used in the tests according to 5.12, 5.13 and 5.14 shall then be adapted.
Prior to assembling, each length of the pliable tubing shall be tested according to 5.3. Depending on the
test, Type 1 sample (see Figure 1) or Type 2 sample (see Figure 2) shall be used.
Type 1:
End fitting – pliable tubing – end fitting
Dimensions in millimetres
Figure 1 — PLT sample Type 1
Type 2:
End fitting – pliable tubing – coupling – pliable tubing – end fitting
Dimensions in millimetres
Figure 2 — PLT sample Type 2
5.1.3 Test sequence schedule
Table 6 gives the sequence to be followed for each test.
Table 6 — Test sequence schedule
Test Tests to verify the Test sequence Clause of this
characteristics document
1 2 3 4 5
A Tightness test A - - - - 5.2
B Dimensional check B - - - - 5.3
C Bending performance B A C A - 5.4
D Crushing resistance B A D A B 5.5
E Stability under pressure B A E A - 5.6
Wear resistance of outer
F F - - - - 5.7
cover
G Structural strength B A G A - 5.8
H Impact resistance B A H A - 5.9
I Penetration resistance B A I A - 5.10
J Resistance to pull out B A J A - 5.11
K Chemical resistance A K A - - 5.12
L Low temperature resistance A L A - - 5.13
M Ageing A M A - - 5.14
N Tightness in case of fire A N A - - 5.15
O Reaction to fire O - - - - 5.16
P Electrical conductivity P - - - - 5.17
Q Pressure drop A Q - - - 5.18
Maximum load for
R R - - - - 5.19
admissible deformation
Example
Test H is preceded by tests B and A and followed by test A.
5.2 Tightness
5.2.1 Tightness for test samples
5.2.1.1 Requirements
The PLT kit shall be tight when tested in accordance with the method given in 5.2.1.2.
The initial tightness test shall be performed with the cover in place. For the final tightness test, the cover
shall be removed in order that it does not contribute to the achievement of the tightness.
5.2.1.2 Test method
When held under water and containing air at a pressure of air at a pressure of 2 bar for class 1, and a
pressure of 3 bar for class 2, the leakage rate of a test sample shall not exceed 10 cm /h.
−3
NOTE A helium leakage rate not exceeding (7x 10 ) mbar l/s is equivalent to the above requirement.
5.2.2 Tightness for FPC
5.2.2.1 Requirements
The PLT shall be tight when tested in accordance with the method given in 5.2.2.2.
The tightness test shall be performed just prior to the cover being applied.
Any operation after the cover being applied which may influence the tightness shall require retesting
with the cover in place.
5.2.2.2 Test method
When held under water and containing air at a pressure of air at a pressure of 2 bar for class 1 and a
pressure of 3 bar for class 2, the leakage rate of a PLT shall not exceed 10 cm /h per 25 m.
−3
NOTE A helium leakage rate not exceeding (7x 10 ) mbar l/sec is equivalent to the above requirement.
5.3 Dimensional check
5.3.1 Requirements
When subjected to the following test method, every sample length of pliable tubing shall show no sign of
inner diameter restriction.
5.3.2 Test method
A metal sphere or gauge, calibrated to (98 +0/–0,5) % of the DN shall pass through the length.
5.4 Bending performance
5.4.1 Requirements
After being bent through 12 cycles in accordance with 5.4.2, PLT samples shall be leak tight when tested
in accordance with 5.2.1.2 and there shall be no visible cracks in the cover.
5.4.2 Test method
The samples shall be subjected to a bend test as shown in Figure 3. With one end rigidly fixed the other
shall be moved to a starting position A in a circular arc around a former having a radius calculated from
the bend radius (pliable test) as given in EN ISO 10380:2012, Table 6 type 3, until the tubing is in intimate
contact with the full length of the arc of the former.
Throughout the test, the sample shall be pressurized with air at MOP according to the DN and class.
The PLT sample shall be bent 12 times through an arc of 180°, the first cycle comprises one bend starting
in a position A moving through B to the end position C, the second cycle being a movement from position
C through B to the end position A.
The longitudinal seam weld shall be located in accordance with position 3 (see Figure 3). If helical
welding is used, the orientation of the weld shall be ignored.
The test frequency shall be between 8 cycles/min and 12 cycles/min.
Side view
Key
r former radius
R bend radius
1 pressure sensor
2 end fittings
3 weld seam orientation
Figure 3 — Bending test configuration
5.5 Crushing resistance
5.5.1 Requirements
When tested in accordance with 5.5.2, the bore size of the pliable tubing shall not be reduced by more
than 15 % of its nominal size DN, and it shall remain tight.
5.5.2 Test method
The internal diameter shall be determined by using the method described in 5.3.2 before the crushing
test.
The corrugated part of the PLT kit sample shall be placed on a hard flat support surface. A load of
4000 N shall be gradually applied on a square steel plate of 150 mm side positioned on the PLT kits
sample. After a stabilization time of 5 min, the load shall be removed.
— subject 2 samples of Type 1 to a crushing test as shown in Figure 4;
— subject 2 samples of Type 1 to a crushing test as shown in Figure 5.
The seam of the PLT kit sample shall be at right angle to the direction of the load. If helical welding is
used, the orientation of the weld shall be ignored.
Carry out the tightness test given in 5.2.1.2.
Following the test, the bore size of the pliable tubing shall be confirmed by using the method given in
5.3.2 but using a sphere or a gauge calibrated to 85 % of that used in the original dimensional test.
−05,
Dimensions in millimetres
Key
1 crushing direction
2 seam weld
3 steel plate
Figure 4 — Crushing test configuration 1
Dimensions in millimetres
Key
1 crushing direction
2 seam weld
3 steel plate
Figure 5 — Crushing test configuration 2
NOTE In the crushing test configuration 2 the protection of the fitting is removed.
5.6 Stability under pressure
5.6.1 Requirements
When subjected to an internal pressure following the test method described in 5.6.2 a PLT kit sample
shall remain tight when tested in accordance with 5.2.1.2 and the permanent elongation after the release
of the pressure shall not exceed 3 %.
5.6.2 Test method
The length of the PLT kit sample shall be measured on a flat surface and recorded. With one of its ends
free and the other one plugged to a pressure device, the PLT kit sample shall be gradually pressurized to
the strength test pressure (STP) but to a minimum of 3 bar or higher, as declared by the manufacturer.
The pressure shall be maintained for 5 min. Following the release of the pressure the length shall be re-
measured.
Strength test pressure before commissioning should consider local and/or national regulations where
they exist.
5.7 Wear resistance of outer cover
5.7.1 Requirements
When subjected to the test described in 5.7.2, the cover shall not be fully penetrated.
5.7.2 Test method
The test method shall consist of the following steps:
1) a 100 mm length of pliable tubing with its cover in place shall be mounted between centres and
rotated with the crest of a corrugation under the test head (see Figure 6);
2) adjust the apparatus to apply a force of 30 N to the test head and rotate the tubing through
(350° ± 5°), at a surface speed of (35 ± 8) mm/s;
3) the cover shall be visually examined for perforation.
Key
r 0,5 mm
1 Test head
Figure 6 — Test configuration of wear resistance outer cover
NOTE Radius r of the test head is to be checked and recorded at each test report.
5.8 Structural strength test
5.8.1 Requirements
When subjected to an internal pressure following the test method described in 5.8.2 a PLT kit sample
shall remain tight when tested in accordance with 5.2.1.2.
Elongation of the PLT kit sample is acceptable.
5.8.2 Test method
Subject the unrestrained sample to an internal pressure of 15 bar in a straight position for a period of
(300 +10/–0) s.
If this test is carried out using water, the sample shall be dried prior to the tightness test.
5.9 Impact resistance
5.9.1 Requirements
A PLT kit sample subjected to an impact of 30 J applied onto its PLT coupling shall remain tight when
tested in accordance with 5.2.1.2.
5.9.2 Test method
Each end fitting shall be secured in a fixed support and the sample shall not touch anything during the
impact.
The seam of the PLT kit sample shall be at right angle to the direction of the load. If helical welding is
used, the orientation of the weld shall be ignored.
A mass of 5 kg as given in detail A, shall be dropped from a height of 600 mm onto the PLT coupling, see
Figure 7.
Dimensions in millimetres
Key
1 mass
2 guide tube with a loose fit
3 PLT coupling
Figure 7 — Impact test
NOTE Protections of fittings are removed.
5.10 Penetration resistance
5.10.1 Requirements
When subjected to the test method as described in 5.10.2, a PLT kit sample of type 1 shall remain tight
when tested in accordance with 5.2.1.2.
5.10.2 Test method
A striker of a mass of 5 kg as given in detail A, shall be dropped from a height of 300 mm onto the PLT
close to the fitting (20 mm from its insert into the fitting or the nut), see Figure 8.
The seam of the pliable tubing at the point of impact shall be at right angles to the direction of force.
Dimensions in millimetres
Key
1 striker
2 guide tube with a loose fit
3 seam zone
Figure 8 — Penetration resistance test configuration
NOTE Protections of fittings are removed.
5.11 Resistance to pull out
5.11.1 Requirements
When subjected to the test method described in 5.11.2 a PLT kit sample shall remain tight.
5.11.2 Test requirements
An axial load of 100 times DN in N (e.g. 3200 N for DN 32) shall be gradually applied to the sample at a
rate of 50 to 100 N/s and the full load shall be maintained for 10 min. After release of the load, the sample
shall be tested in accordance with 5.2.1.2.
5.12 Chemical resistance
5.12.1 Requirements
When subjected to the corrosion tests described in 5.12.2, PLT kit samples shall show:
— no visual signs of blistering or cracking on the pliable tubing cover and additional protection;
— no visual signs of corrosion or cracking on the pliable tubing with its cover and additional protection
removed;
— and no visual signs of corrosion on the PLT fittings, which could affect the safe performance of the
product.
The PLT kit samples shall remain tight when tested in accordance with 5.2.1.2.
5.12.2 Test method
5.12.2.1 General
For each test, a PLT kit sample shall be bent over a cylindrical former whose diameter is calculated using
the radius given in EN ISO 10380:2012, Table 6 type 3, to obtain a U bend sample as shown in Figure 9.
The sample shall be partially immersed in the appropriate solution for the specified time. The sample
shall be fitted with additional protection.
NOTE After the test, it would be advised to disconnect the sample in order to check that there is no test fluid
inside, which could cause a leak at a later stage.
Dimensions in millimetre
Key
1 plugged end fitting
2 additional protection
3 coupling
4 test solutions, given in Tables 7 and 8
R
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