oSIST prEN 13160-7:2025

SLOVENSKI STANDARD
01-november-2025
Sistemi za kontrolo tesnosti - 7. del: Zahteve in metode za preskušanje in
ocenjevanje vmesnih prostorov, zunanjih oblog in plaščev za zaznavanje
netesnosti
Leak detection systems - Part 7: Requirements and test/assessment methods for
interstitial spaces, leak detection linings and leak detection jackets
Leckanzeigesysteme - Teil 7: Anforderungen und Prüf-/Bewertungsmethoden für
Überwachungsräume, Leckschutzauskleidungen und Leckschutzummantelungen
Systèmes de détection de fuites - Partie 7 : Exigences et méthodes ďessai/ďévaluation
pour les espaces interstitiels, les détecteurs de fuite des revêtements et les détecteurs
de fuite d'enveloppes
Ta slovenski standard je istoveten z: prEN 13160-7
ICS:
23.020.01 Vsebniki za shranjevanje Fluid storage devices in
tekočin na splošno general
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2025
ICS 23.020.01; 23.040.99; 29.260.20 Will supersede EN 13160-7:2016+A1:2024
English Version
Leak detection systems - Part 7: Requirements and
test/assessment methods for interstitial spaces, leak
detection linings and leak detection jackets
Systèmes de détection de fuites - Partie 7 : Exigences et Leckanzeigesysteme - Teil 7: Anforderungen und Prüf-
méthodes dessai/dévaluation pour les espaces /Bewertungsmethoden für Überwachungsräume,
interstitiels, les détecteurs de fuite des revêtements et Leckschutzauskleidungen und
les détecteurs de fuite d'enveloppes Leckschutzummantelungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 393.
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-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,
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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

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13160-7:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Requirements . 5
4.1 Effectiveness of leak detection linings and leak detection jackets . 5
4.1.1 Tightness against liquid and vapour. 5
4.1.2 Permeability of leak detection linings and leak detection jackets . 5
4.1.3 Free passage of liquid into the interstitial space . 6
4.1.4 Free passage of air . 6
4.1.5 Pressure decrease during passage of air after ingress of stored product . 6
4.1.6 Mechanical resistance against the imposed load by the stored product . 6
4.1.7 Chemical resistance . 12
4.2 Durability of effectiveness . 12
4.2.1 Temperature resistance . 12
4.2.2 Resistance to chemical attacks . 13
4.2.3 Resistance to mechanical load . 13
5 Sampling, testing and assessment methods . 13
5.1 Effectiveness of leak detection linings and leak detection jackets . 13
5.1.1 Liquid and gas tightness . 13
5.1.2 Permeability . 14
5.1.3 Free passage of liquid into the interstitial space on the sample . 16
5.1.4 Free passage of air . 19
5.1.5 Pressure decrease during passage of air after ingress of stored products . 22
5.1.6 Mechanical resistance against the load imposed by the stored product . 24
5.1.7 Chemical resistance . 24
5.2 Durability of effectiveness . 25
5.2.1 Temperature resistance . 25
5.2.2 Resistance to chemical attacks . 25
5.2.3 Resistance to mechanical load . 25
6 Checking the functionality and durability . 27
6.1 General. 27
6.2 Type testing . 27
6.2.1 General. 27
6.2.2 Test samples and testing . 27
6.2.3 Test reports . 28
6.3 Factory production control . 28
6.3.1 General. 28
6.3.2 Scope of testing . 28
6.3.3 Customised products manufactured in very small quantities. 29
7 Marking, labelling and packaging . 29
Annex A (normative) Determining the volume of the interstitial space for class I systems. 30
Bibliography . 33
European foreword
This document (prEN 13160-7:2025) has been prepared by Technical Committee CEN/TC 393
“Equipment for storage tanks and for filling stations”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13160-7:2016+A1:2024.
This document includes the following significant technical changes with respect to
EN 13160-7:2016+A1:2024:
— in 4.1.2, the test with deionised water has been deleted from Table 1 and Table 2;
— in 4.1.3, a distinction has been made between the permeability test with liquid in accordance with the
requirements of class I and class II;
— in 4.1.6.2 (Table 7 and Table 8), the number of samples has been reduced;
— in 5.1.1.4, it has been clarified in a note that the leak test of this document applies to a type test and
for final production tests or tests after commissioning the values are defined in 6.3;
— in 5.1.2.2, the requirements for the sample have been specified more precisely;
— in 5.1.3, the test procedure for the passage of liquids has been clarified;
— in 5.1.4.1, the test of the intermediate layer(s) has been modified and specified more precisely;
— in 5.1.4.2.3, an option for the test of passage of air has been added;
— in 6.2.2, the number of samples has been modified;
— the tolerances of the measuring devices have been modified throughout the document;
— the term “flow resistance” has been replaced with “pressure decrease” throughout the document;
— Clause 6 has been revised and renamed in Checking the functionality and durability.
The EN 13160 series, under the general title Leak detection systems, is composed of the following parts:
— Part 1: General principles
— Part 2: Requirements and test/assessment methods for pressure and vacuum systems
— Part 3: Requirements and test/assessment methods for liquid systems for tanks
— Part 4: Requirements and test/assessment methods for sensor-based leak detection systems
— Part 5: Requirements and test/assessment methods for in-tank gauge systems and pressurized pipework
systems
— Part 6: Sensors in monitoring wells
— Part 7: Requirements and test/assessment methods for interstitial spaces, leak detection linings and leak
detection jackets
1 Scope
This document specifies requirements and the corresponding test/assessment methods applicable to
leak detection linings and leak detection jackets. Leak detection linings and leak detection jackets are
intended to be used, in conjunction with leak detection kits, to create an interstitial space or leakage
containment in single skin underground or above ground, non-pressurized tanks designed for water
polluting liquids.
For leak detection kits, see EN 13160-2, EN 13160-3 and EN 13160-4.
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 228, Automotive fuels — Unleaded petrol — Requirements and test methods
EN 495-5, Flexible sheets for waterproofing — Determination of foldability at low temperature —
Part 5: Plastic and rubber sheets for roof waterproofing
EN 1107-2, Flexible sheets for waterproofing — Determination of dimensional stability — Part 2: Plastic
and rubber sheets for roof waterproofing
EN 1849-2, Flexible sheets for waterproofing — Determination of thickness and mass per unit area —
Part 2: Plastics and rubber sheets for roof waterproofing
EN 10300:2005, Steel tubes and fittings for onshore and offshore pipelines — Bituminous hot applied
materials for external coating
EN 13121-1, GRP tanks and vessels for use above ground — Part 1: Raw materials — Specification
conditions and acceptance criteria
EN 13121-2:2003, GRP tanks and vessels for use above ground — Part 2: Composite materials — Chemical
resistance
EN 13160-1:2016, Leak detection systems — Part 1: General principles
EN 13160-2:— , Leak detection systems — Part 2: Requirements and test/assessment methods for pressure
and vacuum systems
EN 14879-4:2007, Organic coating systems and linings for protection of industrial apparatus and plants
against corrosion caused by aggressive media — Part 4: Linings on metallic components
EN ISO 62, Plastics — Determination of water absorption (ISO 62)
EN ISO 75-1, Plastics — Determination of temperature of deflection under load — Part 1: General test
method (ISO 75-1)
EN ISO 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and
ebonite (ISO 75-2)
Under preparation. Stage at the time of preparation: prEN 13160-2:2025
EN ISO 75-3, Plastics — Determination of temperature of deflection under load — Part 3: High-strength
thermosetting laminates (ISO 75-3)
EN ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
(ISO 175)
EN ISO 178, Plastics — Determination of flexural properties (ISO 178)
EN ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact
test (ISO 179-1)
EN ISO 179-2, Plastics — Determination of Charpy impact properties — Part 2: Instrumented impact test
(ISO 179-2)
EN ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles (ISO 527-1)
EN ISO 527-3, Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets
(ISO 527-3)
EN ISO 604, Plastics — Determination of compressive properties (ISO 604)
EN ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics —
Part 1: Immersion method, liquid pycnometer method and titration method (ISO 1183-1)
EN ISO 24345, Resilient floor coverings — Determination of peel resistance (ISO 24345)
ISO 2528, Sheet materials — Determination of water vapour transmission rate (WVTR) — Gravimetric
(dish) method
ISO 6133, Rubber and plastics — Analysis of multi-peak traces obtained in determinations of tear strength
and adhesion strength
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13160-1:2016 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Requirements
4.1 Effectiveness of leak detection linings and leak detection jackets
4.1.1 Tightness against liquid and vapour
The integrity of the leak detection linings and leak detection jackets shall be maintained under all
operating pressures.
4.1.2 Permeability of leak detection linings and leak detection jackets
The permeability shall comply with the requirements in Table 1 and Table 2.
Vapours of the stored product should not condense in the interstitial space.
Table 1 — Permeability of leak detection linings
Property Required value
Passage of stored product when installing the leak protection lining in metal max. 100 g/m d
tanks with a passage of stored product of 0 g/m d
Passage of stored product when installing the leak protection lining in tanks max. 0,1 g/m d
d
with a passage of stored product > 0 g/m
If permeability rates are > 0 g/m d, the exhaust line of the leak detector should be connected to the
vapour space of the storage tank.
Unit of measurement is grams per square metres per day (g/m d)
Table 2 — Permeability of leak detection jackets
Property Required value
Passage of stored product max. 2 g/m d
4.1.3 Free passage of liquid into the interstitial space
Interstitial spaces for the use of class I leak detection systems:
The volume of liquid, calculated in accordance with EN 13160-2:— , Formula (4), and the specific
volume V calculated in accordance with Annex A shall flow into the interstitial space within 5 min after
a change in negative pressure.
Interstitial spaces for the use of class II leak detection systems:
The volume flow rate at the test nozzles shall be > 0,5 l/min.
4.1.4 Free passage of air
4.1.4.1 Free passage of air through an intermediate layer
The back pressure of the intermediate layer shall not be higher than 1 kPa at a volume flow rate of air of
(85 ± 5) l/h.
4.1.4.2 Free passage of air through double-skin tanks and pipe
Opening the interstitial space shall result in a pressure change in the interstitial space.
4.1.5 Pressure decrease during passage of air after ingress of stored product
The pressure decrease shall be ≤ 1 kPa (10 mbar) at a volume flow rate of air of (85 ± 5) l/h.
NOTE The measured quantity is the pressure decrease when air flows through the interstitial space, also called
‘flow resistance’ in earlier editions.
4.1.6 Mechanical resistance against the imposed load by the stored product
4.1.6.1 Influence of the mechanical resistance on the free passage in the interstitial space
(determining the pressure decrease)
The pressure decrease in the loaded intermediate layer shall be ≤ 1 kPa (10 mbar) at a volume flow rate
of air of (85 ± 5) l/h.
4.1.6.2 Mechanical properties
Mechanical properties of polyvinylchloride (PVC) shall be in accordance with the requirements specified
in Table 3.
Table 3 — Mechanical properties of polyvinylchloride (PVC)
No. Property Test method Unit Required value
1 Tensile strength, in EN ISO 527-1 and EN ISO 527-3 N/mm ≥ 15
longitudinal and
Test speed: 200 mm/min ± 10 %
transverse direction
Specimen: Type 2
2 Strain at break, in EN ISO 527-1 and EN ISO 527-3 % > 200
longitudinal and
Test speed: 200 mm/min ± 10 %
transverse direction
Specimen: Type 2
3 Reaction of joint to EN ISO 527-1 and EN ISO 527-3 — Off-joint fissure,
shear test joint
Test speed: 200 mm/min ± 10 %
factor ≥ 0,65
Specimen: Type 2
4 Adhesion among layers In accordance with EN ISO 24345, N/mm ≥ 2,0
of multilayered sheet ISO 6133, EN ISO 527-1 and
material EN ISO 527-3
Test speed: 100 mm/min ± 10 %
Specimen: Type 2
5 Dimensional stability EN 1107-2; 2 h in an oven in air at % ≤ 2,0
both in longitudinal and (80 ± 2) °C and then 30 min in
lateral direction after standard atmosphere on a surface
storage at 80 °C that shall not affect dimensions
6 Reaction to folding in EN 495-5 — No fissures shall
both longitudinal and occur on both
transverse direction at a top and bottom
temperature of −20 °C surface
7 Thickness EN 1849-2 % Mean
deviation ± 10
Deviation of
single
values ≤ 12
8 Density EN ISO 1183-1 % Mean
deviation ± 2
The effects of test media on polyvinylchloride (PVC) shall be in accordance with the requirements
specified in Table 4.
Table 4 — Effects of test media on polyvinylchloride (PVC)
Property Test method Unit Required value
Change of mass after storage in In accordance with EN ISO 62 % ≤ 15
deionized water and in the stored in standard atmosphere,
product or test liquids in accordance change shall be determined
with EN 14879-4:2007, Annex C. after the following storage
periods: 3 d, 14 d and 56 d
Change of tensile strength and strain EN ISO 527-1 and % ≤ 25
at break, in both longitudinal and EN ISO 527-3
For the strain at
transverse direction, after storage in
Test speed: break the
deionized water and in the stored
200 mm/min ± 10 % measured value
product (56 d at 23 °C) or test
as given in Table 3
Specimen: Type 2
liquids in accordance with
applies.
EN 14879-4:2007, Annex C.
Change of tensile strength and strain EN ISO 527-1 and % ≤ 25
at break, in both longitudinal and EN ISO 527-3
transverse direction, after storage of
Test speed:
folded materials in deionized water
200 mm/min ± 10 %
and in the stored product (56 d at
Specimen: Type 2
23 °C) or test liquids in accordance
with EN 14879-4:2007, Annex C.
Change of reaction of the joint to the EN ISO 527-1 and — Off-joint fracture
shear test after storage in deionized EN ISO 527-3
water and in the stored product
Test speed:
(56 d at 23 °C) or test liquids in
200 mm/min ± 10 %
accordance with EN 14879-4:2007,
Specimen: Type 2
Annex C.
Mechanical properties of thermoplastics and thermoplastic elastomers except polyvinylchloride (PVC)
shall be in accordance with the requirements specified in Table 5.
Table 5 — Mechanical properties of thermoplastics and thermoplastic elastomers except
polyvinylchloride (PVC)
No. Property Test method Unit Required value
1 Tensile strength, in EN ISO 527-1 and N/mm ≥ 15
longitudinal and EN ISO 527-3
transverse direction
Test speed:
200 mm/min ± 10 %
Specimen: Type 2
2 Strain at break, in EN ISO 527-1 and % > 200
longitudinal and EN ISO 527-3
transverse direction
Test speed:
200 mm/min ± 10 %
Specimen: Type 2
No. Property Test method Unit Required value
3 Reaction of joint to shear EN ISO 527-1 and — Off-joint fracture,
test EN ISO 527-3 joint factor ≥ 0,5
Test speed:
200 mm/min ± 10 %
Specimen: Type 2
4 Adhesion among layers of In accordance with N/mm ≥ 1,0
multilayered sheet EN ISO 24345,
material ISO 6133,
EN ISO 527-1 and
EN ISO 527-3
Test speed:
100 mm/min ± 10 %
Specimen: Type 2
5 Dimensional stability EN 1107-2; 2 h in an % ≤ 10
both in longitudinal and oven in air at
lateral direction after (80 ± 2) °C and then
storage at 80 °C 30 min in standard
atmosphere on a
surface that shall not
affect dimensions
6 Reaction in either EN 495-5 — No fissures shall
direction to folding at a occur on both top
temperature of −20 °C and bottom surface
7 Thickness EN 1849-2 % Mean deviation ± 10
8 Density EN ISO 1183-1 % Mean deviation ± 10
The effects of test media on thermoplastics and thermoplastic elastomers except polyvinylchloride (PVC)
shall be in accordance with the requirements specified in Table 6.
Table 6 — Effects of test media on thermoplastics and thermoplastic elastomers except
polyvinylchloride (PVC)
Property Test method Unit Required value
Change of mass after storage in In accordance with EN ISO 62 % ≤ 20
deionized water and in the stored in standard atmosphere,
product or test liquids in accordance change shall be determined
with EN 14879-4:2007, Annex C. after the following storage
periods: 3 d, 14 d and 56 d
Change of tensile strength and strain EN ISO 527-1 and % ≤ 50
at break, in both longitudinal and EN ISO 527-3
transverse direction, after storage in
Test speed:
deionized water and in the stored
200 mm/min ± 10 %
product (56 d at 23 °C) or test
Specimen: Type 2
liquids in accordance with
EN 14879-4:2007, Annex C.
Property Test method Unit Required value
Change of tensile strength and strain EN ISO 527-1 and % ≤ 60
at break, in both longitudinal and EN ISO 527-3
For the strain at
transverse direction, after storage of
Test speed: break the
folded materials in deionized water
200 mm/min ± 10 % measured value
and in the stored product (56 d at
as given in Table 5
Specimen: Type 2
23 °C) or test liquids in accordance
applies.
with EN 14879-4:2007, Annex C.
Change of reaction of the joint to the EN ISO 527-1 and — Off-joint fracture
shear test after storage in deionized EN ISO 527-3
water and in the stored product
Test speed:
(56 d at 23 °C) or test liquids in
200 mm/min ± 10 %
accordance with EN 14879-4:2007,
Specimen: Type 2
Annex C.
Inner layers of leak detection linings and outer layers of leak detection jackets with epoxide resin (EP) or
unsaturated polyester resin (UP) moulding compounds shall be in accordance with the requirements
specified in Table 7. The inner layer of leak detection linings and the outer layer of leak detection jackets
of its original height, without spacers, shall be used for testing.
Table 7 — Requirements for the inner layer of leak detection linings and on the outer layer of
leak detection jackets with epoxide resin (EP) or unsaturated polyester resin (UP) moulding
compounds
Property Unit Test method Sample Mean value of
property
Dimensions Qty.
Flexural strength MPa EN ISO 178 EN ISO 178 3 ≥ 80
Impact strength kJ/m EN ISO 179-1 EN ISO 179-1 3 ≥ 5
and
EN ISO 179-2
Dimensional stability °C EN ISO 75-1 EN ISO 75-2 3 ≥ 50
under heat
EN ISO 75-2 EN ISO 75-3
EN ISO 75-3
Change in mass after % EN ISO 175 EN ISO 175
28 days storage
— in distilled water at
3 +4
(20 ± 5) °C
— in the stored product
The sample shall Cut surfaces 3 −2
at (20 ± 5) °C or test
be wiped dry shall be
liquids in accordance
and weighed sealed.
with Annex C of
immediately
EN 14879-4:2007
after storage.
Change of flexural % EN ISO 178 EN ISO 178
strength after 28 d
storage
— in distilled water at
3 ≤ −30
(20 ± 5) °C
Property Unit Test method Sample Mean value of
property
Dimensions Qty.
— in the stored product
Cut surfaces 3
at (20 ± 5) °C or test
shall be
liquids in accordance
sealed.
with
EN 14879-4:2007,
Annex C.
The mean values of the flexural strength and of the impact strength shall fulfil the requirements
specified in Table 7. Single values of the flexural strength may be up to 15 % below and single values
of the impact strength up to 30 % below the values specified in Table 7. Single values of the other
properties shall fulfil the requirements of Table 7.
Requirements for intermediate layers and spacers of leak detection linings and of leak detection jackets
according to Figure 1 that are made of epoxy resin shall be in accordance with the requirements specified
in Table 8.
Table 8 — Requirements for intermediate layers of resin and spacers of leak detection linings
and of leak detection jackets
Property Unit Test method Sample Mean value of
property
Dimensions Qty.
Compression strength, as- N/mm EN ISO 604 Length and 3 ≥ 1,0 (no break)
delivered condition width in for tanks with a
accordance height or
with diameter
EN ISO 604 of ≤ 3 m
Height, see ≥ 3,0 (no break)
“Mean value for tanks with a
of property” height or
diameter
of > 3 m
Change of compressive % EN ISO 604 Length and 3 ≥ 0,6 (no break)
strength after 112 days width in for tanks with a
storage at ambient accordance height or
temperature in water and with diameter
in the stored product or EN ISO 604 of ≤ 3 m
test liquids in accordance
Height, see ≥ 1,8 (no break)
with EN 14879-4:2007,
“Mean value for tanks with a
Annex C.
of property” height or
diameter
Cut surfaces
of > 3 m
shall be
sealed.
Leak detection linings and leak detection jackets can be constructed as shown in Figure 1.

a)
b)
c)
Key
1 inner layer of leak detection linings/outer layer of leak detection jackets
2 intermediate layer
3 tank wall
4 inner layer of leak detection linings/outer layer of leak detection jackets with spacers
5 inner layer of leak detection linings/outer layer of leak detection jackets with spacers fixed to the tank wall
Before installation of the leak detection lining/leak detection jacket, the tank wall may be coated in
accordance with EN 14879-4.
Figure 1 — Construction of leak detection linings and leak detection jackets
4.1.7 Chemical resistance
4.1.7.1 Inner layer and outer layer in contact with the stored product
Table 4 and Table 6 shall apply to the components of leak detection linings made of thermoplastics and
thermoplastic elastomers.
EN 13121-2:2003 subclauses 5.2, 5.5 and 5.6, and EN 13121-1 shall apply to the components of leak
detection linings or leak detection jackets made of UP or EP.
4.1.7.2 Intermediate layers and spacers of leak detection linings and leak detection jackets in
contact with the stored product
After the test in accordance with 5.1.5, the pressure decrease shall be ≤ 1 kPa (10 mbar) at a volume flow
rate of air of (85 ± 5) l/h.
4.2 Durability of effectiveness
4.2.1 Temperature resistance
Table 3 and Table 5 shall apply to leak detection linings made of thermoplastics and thermoplastic
elastomers.
5.1.4.1 shall apply to intermediate layers.
Table 7 shall apply to leak detection linings and leak detection jackets made of UP and EP.
4.2.2 Resistance to chemical attacks
Table 4 and Table 6 shall apply to leak detection linings made of thermoplastics and thermoplastic
elastomers.
Table 7 shall apply to leak detection linings or leak detection jackets made of UP and EP.
Table 8 shall apply to intermediate layers and spacers of leak detection linings and of leak detection
jackets.
4.2.3 Resistance to mechanical load
4.2.3.1 Leak detection linings
Table 3 to Table 6 shall apply to the components of leak detection linings made of thermoplastics and
thermoplastic elastomers.
The components of leak detection linings made of UP and EP shall be in accordance with EN 13121-1.
4.2.3.2 Leak detection jackets
There shall be no damage in the form of cracks, de-bonding or delamination after the test in accordance
with 5.2.3.2.
5 Sampling, testing and assessment methods
5.1 Effectiveness of leak detection linings and leak detection jackets
5.1.1 Liquid and gas tightness
5.1.1.1 Test equipment
Test equipment shall be the following:
— vacuum pump with a constant volume flow rate of 85 l/h;
— pressure pump;
— pressure gauge with an accuracy 0,6 % of the full scale range;
— water;
— bucket with graduation.
5.1.1.2 Preparation
The test tank shall be equipped with three test nozzles, which shall be distributed over the tank
circumference.
The test pipe shall have a length of minimum 10 m and shall be equipped with four test nozzles. One test
nozzle shall be provided at each end of the test pipe and the third and fourth test nozzle shall be provided
at a distance of 2,5 m to the nozzles already available.
5.1.1.3 Procedure
The test shall be carried out at a temperature above the freezing point of water but not exceeding +40 °C.
The tightness and the strength of the interstitial space shall be proven by a pressure test on a sample of
a tank or sample pipe at ambient pressure inside the tank or pipe.
The difference of the ambient temperature between the beginning and the end of the test shall be within
a range of 1 K.
The test shall be carried out with the following minimum test pressures (p ):
t2
— for interstitial spaces which are part of a leak detection system working on the basis of leak detection
liquid or positive pressure at 1,1 times the pressure setting of the pressure relief valve, but at least
at 60 kPa (0,6 bar) positive pressure;
— for the interstitial spaces which are part of a leak detection system working on the basis of vacuum
at 1,1 times the negative working pressure of the leak detector and at 1,1 times of the operating
pressure of the pipe or tank while simultaneously pressurizing the pipe or tank.
5.1.1.4 Assessment
The test is deemed to have been passed if the condition in Formula (1) is fulfilled:
p −⋅ pV
( )
BE 1
(1)
10 ≥
t
where
p is the pressure at the beginning of the test, in pascals;
B
p is the pressure at the end of the test, in pascals;
E
t is the test time, in seconds;
V is the volume of the interstitial space in accordance with Annex A, in litres.
NOTE The leak test after installation on site is carried out with lower requirements.
5.1.2 Permeability
5.1.2.1 Apparatus
Apparatus shall be the following:
— scale with an accuracy of ± 0,1 g;
— length measuring device with an accuracy of ± 1 mm;
— volume measuring device with an accuracy of ± 1 ml;
— stored product or the following test liquids defined in volume fraction of ingredients:
a) for unleaded petrol in accordance with EN 228:
1) with maximum 5 % ethanol:
i) 47,5 % toluene;
ii) 30,4 % isooctane (2,2,4-trimethylpentane);
iii) 17,1 % n-heptane;
iv) 3,0 % methanol;
v) 2,0 % butanol;
2) with > 5 % and ≤ 20 % ethanol:
i) 20 % ethanol;
ii) 37,7 % toluene;
iii) 24,2 % isooctane (2,2,4-trimethylpentane);
iv) 13,5 % n-heptane;
v) 3 % methanol;
vi) 1,6 % butanol;
The tolerance for the individual components of the test liquid shall be 0,1 %;
b) for other products:
1) test liquids in accordance with EN 14879-4:2007, Annex C.
5.1.2.2 Preparation
The dimensions of the sample [e.g. bag of lining material (typically flexible liners, films)] shall be
measured and recorded. The sample in form of closed volume with a minimum inner surface of 0,12 m
shall be used. The volume of the test sample shall be filled with (1,0 ± 0,1) l of test liquid and shall be
weighed. For all liners and jackets where the building of a bag is not possible (e.g. GRP liners), the sample
shall be prepared as shown in Figure 2.

Key
1 shut-off valves
2 sample with internal dimensions
NOTE The figure is showing one piece of cylindrical and bottom part; alternatively these can be two different
parts glued together.
Figure 2 — Sample for the permeability test
The wall thickness shall correspond to the thickness of the applied liner. The thinnest version is used for
the test.
One more sample shall always be submitted than required for the test. This additional sample is cut open
and the wall thickness is determined (average value of 4 measuring points of the cylinder and
3 measuring points of each base).
The volume of the test sample shall be filled with (1,0 ± 0,1) l of test liquid and shall be weighed.
5.1.2.3 Procedure
Store the samples in air at a temperature of (23 ± 2) °C.
The cylindrical samples shall be stored horizontally or hung up to ensure ventilation on all sides.
Determine the passage in accordance with ISO 2528 at standard atmosphere, after the following storage
periods: 1 d, 3 d, 7 d, 14 d and 56 d.
Determine the rate of mass loss of the steady-state period (gradient of the regression line) in g/d.
Calculate the surface area A, where A = π × L × D, in m . Divide the rate of mass loss by A to give the
permeability rate in grams per square metres per day (g/m d) for each sample, stating the wall thickness.
5.1.2.4 Assessment
The test is deemed to have been passed if the arithmetic average over 56 d does not exceed the values
specified in Table 1.
Each value measured on the different days shall fulfil the requirements of Table 1 and Table 2.
5.1.3 Free passage of liquid into the interstitial space on the sample
5.1.3.1 General
If an interstitial space is only operated with positive pressure (air or nitrogen), this test is not required.
For interstitial spaces with a negative pressure resistance of more than 40 kPa, a vacuum leak detector
with p > 23 kPa shall be selected. For interstitial spaces with a negative pressure resistance of less than
AE
40 kPa, a vacuum leak detector with p > 3 kPa shall be selected.
AE
5.1.3.2 Apparatus
Apparatus shall be the following:
— leak detector with an alarm pressure in accordance with 5.1.3.1;
— pressure gauge with an accuracy of 0,6 % of the full scale range;
— water;
— bucket with scale.
5.1.3.3 Preparation
Representative sample:
Pipe for class I
The test pipe shall have a length of minimum 10 m and shall be equipped with four test nozzles. One test
nozzle shall be provided at each end of the test pipe and the third and fourth test nozzles shall be provided
at a distance of 2,5 m to the nozzles already available.
Tank for class I
A sample of the interstitial space of at least 1 600 mm × 900 mm shall be used. This sample shall include
seams/welds and an intermediate layer, and it shall have at least two test nozzles arranged 1 500 mm
apart.
Information: The real structure is representative. For example, in the case of a leak detection lining, a
steel plate (= tank wall) is provided with the leak detection lining. The latter shall be sealed around the
circumference.
Tank for class II
A real tank shall be prepared for the test in such a way that it has a socket with a blind plug at 3 points
(at least one of which is at the lowest point). The leak detector for liquids shall be installed in accordance
with the manufacturer’s instructions, but at least 30 cm above the top of the tank.
For the test for class I, the switching values of the leak detector under test shall be recorded, in particular
the Alarm On (p ) and Pump Off (p ) values. These two values are used to determine the volume to be
AE PA
displaced according to 4.1.3.
This leak detector shall be connected to the sample. The suction and measuring line shall be fitted to the
same nozzle, with a shut-off valve in the suction line.
5.1.3.4 Procedure
5.1.3.4.1 Admission of water
The volume of the interstitial space for class I vacuum systems shall be determined in accordance with
Annex A.
The test is carried out at room temperature with water.
The water level (10*) shall be 1 m below the sample when using a leak detector with an alarm
pressure p > 23 kPa, and it shall be at the same height (10) as the sample when using a leak detector
AE
with an alarm pressure p > 3 kPa.
AE
NOTE A pipe is always tested with a leak detector with pAE > 230 mbar.
A hose (that can be shut off in front of the sample) leads from the water storage tank to the sample.
The operating negative pressure shall be generated in the interstitial space (11) with the help of the leak
detector (1). The pressure gauge shall be integrated into the measuring line for checking (via the test
valve (7) of the leakage detector). Slightly open the shut-off valve (9) to the water storage tank and suck
in water until just before the shut-off valve.
Mark the initial water level.
Generate the operating negative pressure, vent via the suction line (6) if necessary. Check the pressure
on the measuring instrument. When the operating negative pressure is reached (pump OFF), close the
shut-off valve (8).
Open the shut-off valve (9) and allow water to flow into the sample until the alarm pressure is reached
(leak detector triggers the alarm), then close the shut-off valve (9) again. If the alarm pressure is not
reached, close the shut-off valve (9) after 5 min at the latest. The volume of water sucked into the
interstitial space (11) shall be measured in either case.
Key
1 leak detector
2 ‘On’ lamp of the leak detector
3 ‘Alarm’ lamp of the leak detector
4 audible alarm of the leak detector
5 liquid stop device
6 3-way valve in the suction line
7 3-way valve in the measuring line
8 shut-off valve below the liquid stop device in the suction line
9 shut-off valve in the connecting line to the water storage tank
10 water storage tank, position for devices with > 3 kPa negative pressure alarm
10* water storage tank, position for devices with > 23 kPa negative pressure alarm
11 sample (interstitial space)
Figure 3 — Test setup for admission test
5.1.3.4.2 Volume flow rate
For class II leak detection systems, the volume flow rate of the leak detection liquid shall be measured at
the outlet at the lowest point and at the two other test nozzles.
To do this, pour the fluid drained in step 1 back into the leak detection fluid reservoir and then continue
with step 2. The same applies for the third step.
Open the particular test nozzle and collect the water over a specified period of time. The specified period
of time is either the alarm signal of the leak detector or a maximum of 5 min.
5.1.3.5 Assessment
These values shall be identical with the values calculated in accordance with 4.1.3, with a tolerance
of ± 10 %.
The volume flow rate for water / leak detection fluid shall be at least 0,5 l/min.
5.1.4 Free passage of air
5.1.4.1 Free passage of air through the intermediate layer
5.1.4.1.1 Apparatus
Apparatus shall be the following:
— thickness tester, with an accuracy of 0,01 mm;
— two square steel retaining plates, 100 mm × 100 mm, thickness 10 mm;
— two square steel pressure plates, 150 mm × 150 mm, thickness 10 mm, with a hole of 10 mm each in
the corners. One steel plate has a hole with a diameter of 6 mm in the middle of the plate and a
connection fitting with a diameter of 6 mm is also welded on in the middle of the plate;
— four retaining screws, 8 mm;
— compression device, with an accuracy of 5 %;
— environmental chamber;
— vacuum pump with a constant volume flow rate of 85 l/h;
— pressure gauge with an accuracy of 1,0 % of the full scale range;
— flow meter with an accuracy of 2,5 % of the full scale range.
5.1.4.1.2 Preparation
The tests shall be carried out at one square sample with the dimensions of 100 mm × 100 mm.
5.1.4.1.3 Procedure
Temperature ranges in accordance with EN 13160-1:2016, 5.1.
NOTE The test at (60 ± 3) °C includes the test at (40 ± 3) °C.
To protect the lining the intermediate layer shall be tested at 1,3 times the maximum possible surface
pressure (p ) in accordance with Formula (2) — but at a minimum of 50 kPa (0,5 bar).
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