SIST EN 13160-5:2016+A1:2025

SLOVENSKI STANDARD
01-januar-2025
Nadomešča:
SIST EN 13160-5:2016
Sistemi za kontrolo tesnosti - 5. del: Zahteve in metode za preskušanje in
ocenjevanje sistemov za zaznavanje netesnosti, vgrajenih v rezervoarje in tlačne
cevovode (vključno z dopolnilom A1)
Leak detection systems - Part 5: Requirements and test/assessment methods for in-tank
gauge systems and pressurised pipework systems
Leckanzeigesysteme - Teil 5: Anforderungen und Prüf-/Bewertungsmethoden für
Tankinhaltsmesssysteme und druckbeaufschlagte Rohrleitungen
Systèmes de détection de fuites - Partie 5: Exigences et méthodes d'essai/d'évaluation
des systèmes de détection de fuites en citernes et des systèmes de tuyauterie sous
pression
Ta slovenski standard je istoveten z: EN 13160-5:2016+A1:2024
ICS:
23.020.10 Nepremične posode in Stationary containers and
rezervoarji tanks
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.

EN 13160-5:2016+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2024
EUROPÄISCHE NORM
ICS 23.020.10; 23.040.99 Supersedes EN 13160-5:2016
English Version
Leak detection systems - Part 5: Requirements and
test/assessment methods for in-tank gauge systems and
pressurised pipework systems
Systèmes de détection de fuites - Partie 5: Exigences et Leckanzeigesysteme - Teil 5: Anforderungen und Prüf-
méthodes d'essai/d'évaluation des systèmes de /Bewertungsmethoden für Tankinhaltsmesssysteme
détection de fuites en citernes et des systèmes de und druckbeaufschlagte Rohrleitungen
tuyauterie sous pression
This European Standard was approved by CEN on 8 April 2016 and includes Amendment 1 approved by CEN on 11 September
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 NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

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 13160-5:2016+A1:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Symbols and abbreviated terms . 7
4 Requirements . 7
4.1 Effectiveness of leak detection kits . 7
4.1.1 General . 7
4.1.2 Electrical or signal cable of the measuring device . 8
4.1.3 Leak detection kit. 8
4.1.4 Measures volumetric loss . 8
4.1.5 Requirements for software . 9
4.1.6 Mechanical construction . 10
4.1.7 Effects of thermal contraction . 10
4.1.8 Alarm device . 10
4.2 Durability of effectiveness . 10
4.2.1 Durability of effectiveness against temperature . 10
4.2.2 Durability of effectiveness against chemical attack . 10
4.2.3 Durability of effectiveness against hydraulic shock (only for measuring devices used
on pressurized line) . 10
4.2.4 Durability of effectiveness against fatigue and mechanical wear\degradation, (only
for measuring devices used on pressurized line) . 10
4.2.5 Durability of effectiveness against microbiological growth on critical surfaces
involved in the measurement process . 10
5 Testing, assessment and sampling methods . 11
5.1 Effectiveness of leak detection kits . 11
5.1.1 General . 11
5.1.2 Disconnection of the electrical or signal cable of the measuring device . 11
5.1.3 Leak detection kit. 11
5.1.4 Measures volumetric loss . 11
5.1.5 Software . 25
5.1.6 Mechanical construction . 25
5.1.7 Effects of thermal contraction . 26
5.1.8 Alarm Device . 26
5.2 Durability of Effectiveness . 26
5.2.1 Durability of effectiveness against temperature . 26
5.2.2 Durability of effectiveness against chemical attack . 26
5.2.3 Durability of effectiveness against hydraulic shock (only for measuring devices used
on pressurized line) . 28
5.2.4 Durability of effectiveness against fatigue and mechanical wear\degradation, (only
for measuring devices used on pressurized line) . 28
5.2.5 Durability of effectiveness against microbiological growth on critical surfaces
involved in the measurement process . 29
6 Assessment and verification of constancy of performance — AVCP . 29
6.1 General . 29
6.2 Type testing . 29
6.2.1 General . 29
6.2.2 Test samples, testing and compliance criteria . 30
6.2.3 Test reports . 31
6.2.4 Shared other party results . 31
6.2.5 Cascading determination of the product type results . 31
6.3 Factory production control (FPC) . 32
6.3.1 General . 32
6.3.2 Requirements . 33
6.3.3 Product specific requirements . 35
6.3.4 Procedure for modifications . 36
6.3.5 One-off products, pre-production products (e.g. prototypes) and products produced
in very low quantity . 36
7 Marking, labelling and packaging . 37
Annex A (normative) Acquisition of field data to provide a standard database for testing
software leak detection systems Category A . 38
A.1 Objective . 38
A.2 Requirements . 39
A.3 Equipment . 40
A.4 Method . 41
A.5 Data up-loading and verification . 43
A.6 Induced leak rates – quantitative systems . 44
A.7 Induced leak rates – qualitative systems . 44
A.8 Test sequence . 44
A.9 Simulated leak test results . 45
A.10 Qualification for use . 45
A.11 Statistical analysis . 46
Annex B (informative) Acquisition of field data to provide a standard database for testing
software leak detection systems Category B(2) . 51
B.1 General . 51
B.2 File sorting and selection . 51
B.3 Data set Requirements . 51
B.4 Induced leak rates – quantitative systems . 52
B.5 Induced leak rates – qualitative systems . 52
B.6 Test sequence . 52
B.7 Evaluation of simulated leak test results . 53
B.8 Qualification for use . 53
B.9 Statistical analysis . 53
B.10 Comparison of variable and constant leak rate pairs . 57
B.11 Validation of conditions of use . 57
Annex C (normative) Leak detection systems Category B(1) . 59
C.1 Preparation . 59
C.2 Stabilization and trial run . 59
C.3 Procedure. 59
C.4 Test results . 63
C.5 Evaluation . 63
Bibliography . 66

European foreword
This document (EN 13160-5:2016+A1:2024) 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 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 May 2025, and conflicting national standards shall be
withdrawn at the latest by August 2026.
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 includes Amendment 1 approved by CEN on 11 September 2024.
This document supersedes !EN 13160-5:2016".
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
!deleted text"
According to EN 13160-5:2004 the following fundamental changes are given:
— Requirement for a device for simulating a leak deleted;
— requirements from EN 13160-1:2003 included, which are no longer contained in EN 13160-1:2016;
— Pressure line leak detection kits included.
This European Standard, Leak detection systems, consists of 7 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 leak detection linings
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 organizations 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.
1 Scope
This European Standard gives requirements and corresponding test\assessment methods applicable to
leak detection kits, based on volumetric loss from within the tank and/or pipework system. The kits
usually comprise:
— Measuring Device
— Evaluation Device
— Alarm Device
Intended use:
Leak Detection kits are intended to be used in\with single or double skin underground tanks or single
or double skin underground and/or aboveground pipework designed for flammable liquids having a
flash point not exceeding 100 °C.
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 590, Automotive fuels — Diesel — Requirements and test methods
EN 976-1, Underground tanks of glass-reinforced plastics (GRP) — Horizontal cylindrical tanks for the
non-pressure storage of liquid petroleum based fuels — Part 1: Requirements and test methods for single
wall tanks
EN 981:1996+A1:2008, Safety of machinery — System of auditory and visual danger and information
signals
EN 12285-1, Workshop fabricated steel tanks — Part 1: Horizontal cylindrical single skin and double skin
tanks for the underground storage of flammable and non-flammable water polluting liquids
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 13352:2012, Specification for the performance of automatic tank contents gauges
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 60296, Fluids for electrotechnical applications — Unused mineral insulating oils for transformers and
switchgear (IEC 60296)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
EN 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications (IEC 61672-1)
ISO 8601, Data elements and interchange formats — Information interchange — Representation of dates
and times
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13160-1:2016 and the
following apply.
3.1.1
quantitative output
numerical indication of the leak rate
3.1.2
qualitative output
pass/fail indication for a given test with reference to a specified leak rate
3.2 Symbols and abbreviated terms
B is the bias
LL is the lower confidence bound for probability of detection
UL is the upper confidence bound for probability of detection
MSE is the mean squared error
PD is the probability of detection
PFA is the probability of false alarm
PI (all) is the proportion of invalid records for all records
PI (leak) is the proportion of invalid records for leaking tanks
PI (tight) is the proportion of invalid records for tight tanks
R is the simulated leak rate
C is the criterion or threshold for indicating a leak
B is the estimated bias of the system
SD is the standard deviation
t is the two-sample t-test bias
b
4 Requirements
4.1 Effectiveness of leak detection kits
4.1.1 General
This type of leak detection kit is classified according to EN 13160-1:2016 as class IV.
The general requirements on leak detection systems according to Clause 5 of EN 13160-1:2016 shall be
met.
The measuring device shall fulfil the requirements according to 5.1of EN 13352:2012.
The level to volume conversion methodology shall fulfil the requirements according to Annex B of
EN 13352:2012.
A complete documentation shall be provided by the manufacturer. The documentation shall contain the
technical values according to 4.1.2 to 4.1.8 and 4.2.
4.1.2 Electrical or signal cable of the measuring device
In the event of disconnection of the electrical or signal cable or malfunction of the measuring device an
alarm condition shall result.
4.1.3 Leak detection kit
The leak detection kit shall consist of:
— measuring device;
— evaluation device;
— alarm device.
4.1.4 Measures volumetric loss
4.1.4.1 General
Table 1 — Performance requirements for categories of leak detection
Alarm
Maximum time of
threshold
detection
Category Type
leak rate
h
-1
l ⋅ h
A Dynamic leak detection using Type 2 ≥ 0,8 336
the comparison of sales data with
Type 1 ≥ 0,4 336
tank volume changes
B(1) Static leak detection Type 2 ≥ 0,8 4
Type 1 ≥ 0,4 8
B(2) Statistical quiet Type 2 ≥ 0,8 24
period detection
C Pressure line leak detection Type 3 ≥ 12 1
(catastrophic loss)
C Pressure line leak detection Type 2 ≥ 0,8 12
C Pressure line leak detection Type 1 ≥ 0,4 12
Any gauge system to be used for category A, B(1) and B(2) of leak detection shall have water detection
capability.
The operating condition of the evaluation device shall be clearly indicated, i.e. through the provision of
a fault, light or similar indicator.
For categories A and B, the requirements of a gauge control device as defined in EN 13352 shall be met.
An alarm shall be activated whenever a leak rate for Type 1 is detected at the specified rate or above, in
accordance with Table 1.
Where performance in accordance with Table 1 for category A and category B is not achievable within
the required levels of probability, the results shall be reported as inconclusive.
The leak detection kit shall have a device for automatically shut-off the submersible pump in the event
of an alarm condition.
4.1.4.2 Category A – Dynamic leak detection
4.1.4.2.1 Type 2
For this type, the system shall communicate with the metering system, associated with the withdrawal
of product from the storage tank, in order to receive details of all volumes dispensed from the tank. At
the specified leak rate according to Table 1, the system shall have a probability of detection of at least
95 % while a false alarm rate shall not exceed 5 %.
4.1.4.2.2 Type 1
For this type, the system shall communicate with the metering system, associated with the withdrawal
of product from the storage tank, in order to receive details of all volumes dispensed from the tank. At
the specified leak rate according to Table 1, the system shall have a probability of detection of at least
95 % while a false alarm rate shall not exceed 5 %.
4.1.4.3 Category B (1) – Static leak detection
4.1.4.3.1 Type 2
For this type, the system shall be capable of detecting the specified leak rate according to Table 1 with a
probability of at least 95 % while operating at a false alarm rate of 5 % or less.
4.1.4.3.2 Type 1
For this type, the system shall be capable of detecting the specified leak rate according to Table 1 with a
probability of at least 95 % while operating at a false alarm rate of 5 % or less.
4.1.4.4 Category B (2) – Statistical quiet period detection – Type 2
For this type, the system shall communicate with the metering system, associated with the withdrawal
of product from the storage tank, in order to receive details of all volumes dispensed from the tank. At
the specified leak rate according to Table 1, the system shall have a probability of detection of at least
95 % while a false alarm rate shall not exceed 5 %.
4.1.4.5 Category C – Pressure line leak detection – Type 1
For this type, the system shall be capable, when no product is being dispensed of detecting the specified
leak rate according to Table 1 with a probability of 99 %.
4.1.4.6 Category C – Pressure line leak detection - Type 2
For this type, the system shall be capable, when no product is being dispensed of detecting the specified
leak rate according to Table 1 with a probability of 99 %.
4.1.4.7 Category C – Pressure line leak detection - Type 3
For this type, the system shall be capable, when no product is being dispensed of detecting the specified
leak rate according to Table 1 with a probability of99 %.
4.1.5 Requirements for software
The software, where provided, shall have a facility for self-checking by fulfilling the following
requirements:
— a self-diagnostic mode to test the integrity of the system at start up and periodically during use. A
negative result of self-diagnostic mode shall result in an alarm condition;
— a facility to check the consistency of the input and output data, malfunction shall result in an alarm
condition.
The software shall also provide an algorithmic determination of volumetric loss.
4.1.6 Mechanical construction
Ingress protection for the measuring device shall be at least IP 68 according to EN 60529.
4.1.7 Effects of thermal contraction
The evaluation device for category C shall feature a provision to filter the effects of
expansion\contraction resulting from thermal volume change of the fluid and associated vessels and
pipework systems.
4.1.8 Alarm device
The alarm device shall generate an audible and visible alarm. The audible alarm shall have a sound level
of ≥ 70 dB (A) in a distance of minimum 1 m with a signal according to Table 1 of
EN 981:1996+A1:2008 which shall be maintained for a minimum period of 36 h. The audible alarm may
be able to be switched off, but the status off should be visible.
The visible alarm shall be clearly indicated. The visible alarm shall have no switch off option.
The alarm device should be designed for connecting an additional alarm device, e.g. signal horn. The
output parameter shall be stated.
A test possibility shall be provided to test the functionality of the audible and visible alarm.
4.2 Durability of effectiveness
4.2.1 Durability of effectiveness against temperature
The components of a leak detection system shall meet the requirement as given in EN 13352.
4.2.2 Durability of effectiveness against chemical attack
Parts of leak detection kits which can come into contact with the stored liquid/water or its vapour shall
be resistant.
4.2.3 Durability of effectiveness against hydraulic shock (only for measuring devices used on
pressurized line)
The measuring devices shall withstand a transient pressure not less than 1,4 MPa.
4.2.4 Durability of effectiveness against fatigue and mechanical wear\degradation, (only for
measuring devices used on pressurized line)
At a temperature of (20 ± 5) °C the measuring device shall continue to operate according to Table 1,
Category C after 50 000 cycles at a pressure range from 0 kPa to 350 kPa.
4.2.5 Durability of effectiveness against microbiological growth on critical surfaces involved in
the measurement process
Microbiological growth is generated based on the presence of water. To minimize the effect of microbial
growth on the measurement process a means of detecting water shall be provided.
5 Testing, assessment and sampling methods
5.1 Effectiveness of leak detection kits
5.1.1 General
For the tests the following documentation shall be provided by the manufacturer:
— manual(s);
— datasheet of the parts of the leak detection kit;
— electrical diagrams of the parts of the leak detection kit;
— design and application drawings;
— parts lists of the used components including material data;
— and shall be inspected visually.
5.1.2 Disconnection of the electrical or signal cable of the measuring device
The measuring device shall be disconnected.
The disconnection of the measuring device shall result in an alarm.
5.1.3 Leak detection kit
Visual test shall be carried out that the leak detection kit consists of measuring device, evaluation
device, alarm device and shut-off device for the submersible pump.
5.1.4 Measures volumetric loss
5.1.4.1 General
The test shall be carried out at a temperature of (20 ± 5) °C.
The test liquid shall be diesel according to EN 590 or transformer oil according to EN 60296.
5.1.4.2 Category A - Dynamic leak detection
5.1.4.2.1 Type 2
5.1.4.2.1.1 Test equipment
The manufacturer shall supply the algorithmic method representative of the system under test in the
form of software loaded onto a computer which is capable of reading in and processing files from the
standard test database previously collected from representative locations. These files shall be provided
in a standard format according to Annex A and shall be accepted without any pre-processing.
The manufacturer shall state the initialization period required for the system under test, which shall not
exceed 28 days.
A computer and associated data transfer peripherals.
Dispenser with digital data connection to transmit the volume withdrawn from the storage tank
5.1.4.2.1.2 Preparation
In each case, tests shall be performed following an initialization period equivalent to a maximum of
28 days operation, during which the system under test processes normal operational data without
induced leaks.
A set of files shall be selected from the standard database, according to the details given in A.1.
For each type of draw-off system and fuel, the files selected shall meet the following conditions:
For each of the draw-off methods and each fuel listed in A.1, between 25 % and 75 % of the data files
selected should be taken from tanks where that type of draw-off system or fuel is in use. The same data
file may cover two or more uses, for example a manifolded tank using pressurized draw-off via multiple
dispensers.
Leak detection systems to be tested will provide a quantitative or a qualitative output. A qualitative
output will indicate a pass/fail result in accordance with Table 1.
The minimum sample sizes for data files, which shall be collected for each of these types, are:
— Systems with a Quantitative Output: ≥ 100 files (not more than 15 from the same tank);
— Systems with a Qualitative Output: ≥ 240 files (not more than 36 from the same tank).The database
files shall be sorted to form an ordered data set which is divided into 5 equal groups according to
the 20th, 40th, 60th and 80th percentiles of the recorded range of shade temperature. Each of the
five groups shall be further divided into 3 equal sub-groups, according to the 33rd and 67th
percentiles of the recorded range of tank sizes, such that sub-groupings are determined
independently for each of the five groups.
For systems with a quantitative output, three files shall be selected at random from each of the 15 sub-
sets, to provide a sample of 45 files for subsequent evaluation.
For systems with a qualitative output, eight files shall be selected at random from each of the 15 sub-
sets, to provide a sample of 120 files for subsequent evaluation.
For example, for data collected over the ranges of shade temperature and tank capacity as defined in
A.1, the files would be sorted as shown in Table 2, and n files selected from each sub-set as shown,
where n = 3 for a quantitative system and n = 8 for a qualitative system:
Table 2 — Selection of data files according to tank capacity and ambient temperature during
collection of the data
Tank Capacity Shade Temperature
-5 °C to 20th 20th to 40th 40th to 60th 60th to 80th 80th
Percentile Percentile Percentile Percentile Percentile
to 30 °C
10 000 l to Select n files Select n files at Select n files at Select n files Select n files
33rd Percentile at random random random at random at random
33rd to 67th Select n files Select n files at Select n files at Select n files Select n files
Percentile at random random random at random at random
67th Percentile Select n files Select n files at Select n files at Select n files Select n files
to 50 000 l at random random random at random at random
5.1.4.2.1.3 Procedure
A software tool shall be provided to simulate the following:
Tank leaks (constant)
Leaks from tanks are simulated as a continuous loss of product from the tank at a constant leak rate.
The figure in a record representing the volume of stored product is reduced by a value equivalent to the
quantity of product that would be lost at the specified rate during the time period between the record
and its predecessor. The simulated losses for all previous time periods are accumulated and the total
subtracted from the figure representing stored volume. These accumulated losses are also carried
forward through each delivery event such that the subtracted figure increases monotonous.
Therefore, the volume figure, v , of the ith record is replaced by v ', calculated according to Formula (1):
i i
i
v = -  -  R (1)
v t t
′ ( )
i i j j-1
∑
j=1
where
R = simulated leak rate in litre per hour;
t = time stamp of jth record;
j
t = time stamp of predecessor to jth record.
j-1
Where tanks are connected via a siphon, the quantity of product corresponding to the leak over the
specified time interval is divided by the number of tanks in the siphon arrangement and this quantity
subtracted from the records for each of the tanks connected via the siphon.
Tank leaks (variable)
Leaks from tanks are simulated as a continuous loss of product from the tank at a variable leak rate
which reduces as the quantity of stored product is reduced. The figure in a record representing the
volume of stored product is reduced by a value equivalent to the quantity of product which would be
lost at a rate specified for the time period between the record and its predecessor. The records in a file
are divided into sets, each of which comprises all the records between one delivery and the next.
Successive records in a set therefore always exhibit a decrease in stored volume. Where there are n
records in a set, and the stored volume of the jth record is v , the leak rate r for that record is found as a
j j
function of the nominal leak rate to be simulated R, according to Formula (2):
n
v
j
= R (2)
r
j
n
v
k
∑
k=1
Therefore, the volume figure, v , of the ith record is replaced by v ', calculated according to Formula (3):
i i
i
v = -  -  (3)
′ v t t r
( )
iji j j-1
∑
j=1
The simulated losses for prior periods are accumulated and similarly subtracted from the figure
representing stored volume. These accumulated losses are also carried forward through each delivery
event such that the subtracted figure increases monotonous.
Where tanks are connected via a siphon, the quantity of product corresponding to the leak over the
specified time interval is divided by the number of tanks in the siphon arrangement and this quantity
subtracted from the records for each of the tanks connected via the siphon.
Pipe leaks (suction and pressurized draw-off)
Leaks from draw-off pipes are simulated as a loss of product from the pipe at a constant leak rate but
only while dispensers are idle and the pipe is pressurized where applicable. Each data file is first
processed to accumulate the total time that fuel is being drawn from the pipe. The total volume of
product which would be lost over the period(T) covered by data set within the file at a constant leak
rate, R, is calculated and divided by the total dispensing time to give a leak rate, R´, during dispensing,
see Formula (4):
R ⋅ T
R′ = (4)
n
( - )
te ts
jj
∑
j=1
where
t = end time of the jth dispensing transaction;
ej
t = start time of the jth dispensing transaction;
sj
n = total number of dispensing transactions in the file;
T = elapsed time from start to end of file in minutes.

The figure in a record representing the volume of stored product is reduced by a value equivalent to the
quantity of product which would be lost at the rate R´ during the time period between the record and its
predecessor, but only when a dispenser was drawing fuel during that period. The simulated losses for
all previous time periods are accumulated and the total subtracted from the figure representing stored
volume in this and all subsequent records (including periods where no fuel is drawn from the tank).
These accumulated losses are also carried forward over each delivery event such that the subtracted
figure increases monotonous.
Therefore, the volume figure, v , of the ith record is replaced by v ', calculated according to Formula (5):
i i
m
′
v = -  -  R (5)
′ v te ts
i i ( jj)
∑
j=1
Where
m  number of dispensing transactions whose end time is earlier than the time stamp of the ith record.
Where tanks are connected via a manifold arrangement, the quantity of product corresponding to the
leak over the specified time interval is divided by the number of tanks connected to the manifold and
this quantity subtracted from the records for each of the tanks so connected
5.1.4.2.1.4 Evaluation
-1
Tests has to be passed if a leak rate of 0,8 l⋅h is detected within 336 h with a probability of detection
not less than 95 % and a probability of false alarms not greater than 5 %.
5.1.4.2.2 Type 1
5.1.4.2.2.1 Test equipment
According to 5.1.4.2.1.1
5.1.4.2.2.2 Preparation
According to 5.1.4.2.1.2
5.1.4.2.2.3 Procedure
According to 5.1.4.2.1.3
5.1.4.2.2.4 Evaluation
-1
Tests has to be passed if a leak rate of 0,4 l⋅h is detected within 336 h with a probability of detection
not less than 95 % and a probability of false alarms not greater than 5 %.
5.1.4.3 Category B(1) – Static leak detection
5.1.4.3.1 Type 2
5.1.4.3.1.1 Test equipment
— A double wall storage tank with a size and shape that represents the applicable circumstances of
usage, according to EN 12285-1 or EN 976-1 of minimum capacity 30 000 l installed underground
or that is constructed such that the tank used for test is surrounded with a material having a
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specific heat capacity of between 0,80 kJ kg K and 1,48 kJ kg K .
— The tank shall be fitted with an independent leak detection system according to EN 13160-2 for
Class I to prove tightness during test.
— A suitable apparatus fitted to the test tank for the continuous monitoring of product temperature
i.e. a temperature measurement device with an accuracy of 1 K. The device consists of a vertical
array of temperature sensors over the height of the test tank with a spacing of (300 ± 10) mm
between the temperature sensors.
— A second tank (e.g. an above- or underground tank or a tanker truck) having a minimum nominal
tank capacity of 15 000 l, together with a pump and suitable hoses for transferring product to and
from the test tank.
— A heat exchanger or other suitable heating device capable of heating and cooling the test fluid
by ± 5 K, within an uncertainly of ± 1 K, before it is transferred into the test tank.
— A variable-rate peristaltic or other suitable pump capable of withdrawing liquid from the test tank
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at present rates between 0,2 l⋅h and 0,8 l⋅h within an accuracy of 0,25 %.
— A time measuring device having a time indication in steps of 1 s to a minimum total of 24 h, within
an accuracy of ± 1 s.
— Barometric pressure and atmospheric temperature measuring equipment suitable for continuous
monitoring of environmental conditions in the areas of the test facility where components of the
system under test are installed.
5.1.4.3.1.2 Preparation
The liquid surface in the tank shall be stabilized for a time given by the manufacturer after the last
filling and after the last removal from the tank which ever happens later.
5.1.4.3.1.3 Pr
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