SIST-TP CEN/TR 15120:2013
(Main)Tanks for transport of dangerous goods - Guidance and recommendations for loading, transport and unloading
Tanks for transport of dangerous goods - Guidance and recommendations for loading, transport and unloading
This Technical Report provides guidance and recommendations to enable the transfer of product and vapour between the loading gantry, the tank truck and the service station. The European Parliament and Council Directive 94/63/EC (VOC Directive) requires operators to ensure that petroleum vapours are not emitted into the atmosphere during loading and unloading. The recommendations and guidance given in this document are intended to assist users in meeting the requirements of this Directive. This Technical Report acknowledges that, for climatic and logistical reasons, alternative technical solutions are commonly used in the Arctic Region. This Technical Report gives guidance and recommendations for loading at terminals and discharge at service stations or customer premises of tank trucks transporting dangerous substances of Class 3 of ADR - European Agreement concerning the International Carriage of Dangerous Goods by Road - (flammable liquids) which have a vapour pressure not exceeding 110 kPa at 50 °C and petrol, and which have no sub-classification as toxic or corrosive.
Tanks für die Beförderung gefährlicher Güter - Leitlinien und Empfehlungen für Ausfüllung, Beförderung und Entleerung
Dieser Technische Bericht enthält Leitlinien und Empfehlungen, um den Umschlag von Produkt und dessen Dämpfen zwischen Ladestation, Straßentankfahrzeug und Tankstelle zu ermöglichen.
Die Richtlinie 94/63/EG (VOC-Richtlinie) fordert von den Betreibern die Sicherstellung, dass Kohlenwasser-stoffgase nicht während der Befüllung und der Entladung in die Atmosphäre entweichen. Die Empfehlungen und Leitlinien in diesem Dokument sollen die Anwender bei der Erfüllung der Anforderungen dieser Richtlinie unterstützen.
Dieser Technische Bericht berücksichtigt, dass aus klimatischen und logistischen Gründen im arktischen Gebiet üblicherweise alternative technische Lösungen verwendet werden.
Dieser Technische Bericht enthält Leitlinien und Empfehlungen für die Befüllung an Verladestationen und die Entladung an Tankstellen oder bei Kunden von Straßentankfahrzeugen, die gefährliche Stoffe der Klasse 3 von ADR — Europäisches Übereinkommen über die internationale Beförderung gefährlicher Güter auf der Straße — (entzündbare flüssige Mineralölprodukte), deren Dampfdruck bei 50 °C höchstens 110 kPa beträgt, und Ottokraftstoff befördern und die nicht als giftig oder ätzend eingestuft sind.
Citernes destinées au transport de matières dangereuses - Lignes directrices et recommandations pour le chargement, le transport et le déchargement
Cisterne za prevoz nevarnega blaga - Navodila in priporočila za polnjenje, prevoz in praznjenje
To tehnično poročilo zagotavlja navodila in priporočila, da se omogoči prenos proizvoda in hlapov med polnilnim otokom, tovornjakom s cisterno ter bencinskim servisom. Evropski parlament in Direktiva Sveta 94/63/ES (Direktiva HOS) izvajalcem nalagata, da morajo zagotoviti, da naftni hlapi ne hlapijo v ozračje med polnjenjem in praznjenjem. Priporočila in navodila iz tega dokumenta so namenjena pomoči uporabnikom pri izpolnjevanju zahtev iz te direktive. To tehnično poročilo navaja, da se v arktični regiji zaradi podnebnih in logističnih razlogov uporabljajo nadomestne tehnične rešitve. To tehnično poročilo vsebuje navodila in priporočila za polnjenje na terminalih in praznjenje na bencinskih servisih ali v prostorih strank, ki ga izvajajo tovornjaki s cisterno, ki prevažajo nevarne snovi kategorije 3 ADR – Evropski sporazum o prevozu nevarnega blaga po cesti – (vnetljive tekočine), katerih parni tlak ne presega 110 kPa pri 50 °C, ter motorni bencin, pri čemer niso dodatno opredeljeni kot strupeni ali korozivni.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST-TP CEN/TR 15120:2013
01-december-2013
1DGRPHãþD
SIST-TP CEN/TR 15120:2005
&LVWHUQH]DSUHYR]QHYDUQHJDEODJD1DYRGLODLQSULSRURþLOD]DSROQMHQMHSUHYR]
LQSUD]QMHQMH
Tanks for transport of dangerous goods - Guidance and recommendations for loading,
transport and unloading
Tanks für die Beförderung gefährlicher Güter - Leitlinien und Empfehlungen für
Ausfüllung, Beförderung und Entleerung
Citernes destinées au transport de matières dangereuses - Lignes directrices et
recommandations pour le chargement, le transport et le déchargement
Ta slovenski standard je istoveten z: CEN/TR 15120:2013
ICS:
13.300 Varstvo pred nevarnimi Protection against dangerous
izdelki goods
23.020.20 Posode in vsebniki, montirani Vessels and containers
na vozila mounted on vehicles
SIST-TP CEN/TR 15120:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST-TP CEN/TR 15120:2013
TECHNICAL REPORT
CEN/TR 15120
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
May 2013
ICS 13.300; 23.020.20 Supersedes CEN/TR 15120:2005
English Version
Tanks for transport of dangerous goods - Guidance and
recommendations for loading, transport and unloading
Citernes destinées au transport de matières dangereuses - Tanks für die Beförderung gefährlicher Güter - Leitlinien
Lignes directrices et recommandations pour le chargement, und Empfehlungen für Ausfüllung, Beförderung und
le transport et le déchargement Entladung
This Technical Report was approved by CEN on 28 January 2013. It has been drawn up by the Technical Committee CEN/TC 296.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 15120:2013: E
worldwide for CEN national Members.
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Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Bottom loading gantry function and operation .6
5 Tank truck function and equipment .8
6 Electrical equipment . 14
7 Gantry — tank truck system interfaces . 14
8 Conditions of operation . 14
9 Safe loading pass . 14
10 Discharge . 15
Annex A (normative) Tank connection envelope . 18
Annex B (normative) Vapour flow performance test . 22
Annex C (normative) Information plate . 28
Annex D (normative) Overfill prevention sensor setting . 30
Annex E (informative) Illustration of when an explosive atmosphere might be present or might
arise during loading operations . 32
Annex F (informative) Safe loading pass scheme . 34
Bibliography . 38
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Foreword
This document (CEN/TR 15120:2013) has been prepared by Technical Committee CEN/TC 296 “Tanks for
the transport of dangerous goods”, the secretariat of which is held by AFNOR.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes CEN/TR 15120:2005.
The main changes compared to the previous edition are:
additional statement concerning spray deflectors added to 5.2.1;
additional statement concerning pressure balanced footvalve pressure relieving added to 5.3.3;
new section 5.3.4 concerning cap for loading and unloading adaptor added;
additional statement clarifying where 5.5 kPa pressure shall be measured in 5.4.1;
reference to EN12971 removed from 5.4.1;
flame arrester specification updated to meet latest standards in 5.4.5;
additional statement concerning positioning of an overfill probe added to 5.5.1;
Annex A – statement concerning height of loading adaptors changed to reflect Directive 94/63/EC;
Annex A – additional statement defining minimum adaptor spacing added.
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1 Scope
This Technical Report provides guidance and recommendations to enable the transfer of product and vapour
between the loading gantry, the tank truck and the service station.
The European Parliament and Council Directive 94/63/EC (VOC Directive) requires operators to ensure that
petroleum vapours are not emitted into the atmosphere during loading and unloading. The recommendations
and guidance given in this document are intended to assist users in meeting the requirements of this
Directive.
This Technical Report acknowledges that, for climatic and logistical reasons, alternative technical solutions
are commonly used in the Arctic Region.
This Technical Report gives guidance and recommendations for loading at terminals and discharge at service
stations or customer premises of tank trucks transporting dangerous substances of Class 3 of ADR -
European Agreement concerning the International Carriage of Dangerous Goods by Road – (flammable
liquids) which have a vapour pressure not exceeding 110 kPa at 50 °C and petrol, and which have no
sub-classification as toxic or corrosive.
2 Normative references
The following documents, in whole in part, are normatively referenced in this document and are indispensable
for its application. For dated references, only the edition cited applies. For undated references, the latest
edition of the referenced document (including any amendments) applies.
EN 12972, Tanks for transport of dangerous goods — Testing, inspection and marking of metallic tanks
EN 14564:2013, Tanks for transport of dangerous goods — Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14564:2013 and the following apply.
3.1
arctic region
region comprising Finland, Norway and Sweden
3.2
authorisation to load
authorisation of a tank truck loader by a terminal operator to load the required goods into the tank truck
following the verification of his or her competence including any required certification and its associated
validity
3.3
driver
person in charge of the tank truck, having responsibility for driving and who might or might not also be
responsible for its loading and/or discharge
3.4
overfill
filling of a tank truck or one or more of its compartments to the extent that the total volume loaded into a
compartment exceeds the maximum permitted volume
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3.5
overfill prevention system
gantry-mounted controller connected to sensors mounted at a pre-determined high level in a tank truck that
will, in the event that a sensor detects liquid, signal the gantry control valve to cease loading flow in order to
prevent the overfilling of the tank truck
3.6
overloading
loading of a tank truck such that its total weight exceeds that permitted by local road regulations, or the load
imposed by one or more axles exceeds the local maximum authorised weight for that axle
3.7
tank truck
truck which conforms to the definition of either tank-vehicle, demountable tank, tank container or tank swap
body given in EN 14564
3.8
safe loading pass
permit issued to a tank truck upon verification by inspection that its design and maintenance satisfy safety and
gantry compatibility requirements
3.9
tank truck loader
person responsible for loading the tank truck in accordance with the load plan
Note 1 to entry: The tank truck loader is sometimes called the filler.
3.10
tank truck operator
legal entity/company that provides funds, tank trucks and personnel in order to transport dangerous goods as
described in Clause 1
3.11
terminal operator
person or company in charge of terminal operations, including the responsibility for storage, handling, loading
of dangerous goods and providing the information with regard to the specifications of the product to be loaded
3.12
maximum permitted volume
maximum volume of the compartment, or in total
Note 1 to entry: Maximum permitted volume means the same as the term "degree of filling", which is used in the
European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR).
3.13
frustrated delivery
delivery where the driver is unable to unload the intended volume
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4 Bottom loading gantry function and operation
4.1 Gantry loading equipment
4.1.1 General
Arrangements to permit loading of tank trucks, equipped according to this document, should be available on at
least one gantry at each arctic loading facility.
4.1.2 Overfill prevention system
Loading gantries should have meters to determine the volume loaded into a tank truck compartment. The
primary overfill prevention system should comprise the pre-setting of the gantry loading meter by the tank
truck loader for each tank truck compartment separately before it is loaded.
4.1.3 Level detection — Secondary shut off (overfill prevention) system
The gantry-based components of the overfill prevention system should conform to EN 13922. The plug should
be able to connect with the connector within the tank connection envelope as described in Annex A. It should
be considered as a secondary overfill prevention system in the event that the primary volume limiting system
(meter pre-set) does not operate.
NOTE In the arctic region, 2-wire thermistor sensors with a positive temperature coefficient conforming to national
standards and individual tank truck mounted shut-off devices are commonly used.
4.1.4 Coupler for bottom loading
Couplers for bottom loading should be operationally compatible with adaptors for bottom loading and should
be able to connect with them within the tank connection envelope as described in Annex A.
Where tank trucks fitted with valves which can be closed against product flow are loaded, a surge pressure
of 2 500 kPa should not compromise the integrity or functions of the coupler.
In order to prevent the accumulation of any electrostatic charge, there should be electrical resistance of less
6
than 10 ohms across a metallic coupler and adaptor, and less than 10 ohms in other cases, when connected.
NOTE In the arctic region, couplers for bottom loading with the same functionality but able to connect with an adaptor
for bottom loading with a reduced diameter are commonly used.
4.1.5 Vapour collection system
The vapour collection coupler should conform to EN 13081 and should be able to connect with the vapour
collection adaptor within the tank connection envelope as described in Annex A.
NOTE In the arctic region, a vapour collection coupler with the same functionality but with a reduced diameter are
commonly used.
4.1.6 Drive away restriction
A system to prevent unauthorised movement of a tank truck may be provided.
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4.2 Loading conditions
4.2.1 Maximum loading rates per loading arm
The maximum loading rate per loading arm should not exceed the values given in Table 1.
It is recommended that the tank truck be suitable for high speed loading (see 5.2.1).
NOTE Table 1 has been adapted from CLC/TR 50404 and gives the flow rates for diameters of pipe used in loading
systems, including tank truck pipework, such that the accumulation of the electrostatic charge on the surface of the liquid
does not exceed acceptable limits. The reduced values given in brackets apply to non high speed loading tank trucks.
Maximum loading rates (vd < 0,5) are given for design purposes; loading rates may be reduced for safety
reasons depending upon specific circumstances.
Table 1 — Conductivity
Conductivity
pS/m
Known > 50 Known > 10 Known < 10, or unknown
Product class
max. loading rate max. loading rate max. loading rate
and sulphur
content
l/min l/min l/min
a
[S] mg/kg
c b
DN v × d DN DN v × d DN DN
v × d DN
80 mm 100 mm 80 mm 100 mm 80 mm 100 mm
Gasoline (any S 1 900 2 400 1 900 2 400 1 900 2 400
< 0,5 < 0,5 < 0,5
d
level)
(< 0,38) (1 400) (1 800)
Diesel or gasoil 1 900 2 400 1 900 2 400 1 900 2 400
< 0,5 < 0,5 < 0,5
with S > 50 and
(< 0,38) (1 400) (1 800)
all other fuels
Diesel or gasoil < 0,5 1 900 2 400 < 0,5 1 900 2 400 < 0,35 1 300 1 650
with S < 50
(1 400) (1 800) (940) (1 200)
(< 0,38) (< 0,25)
NOTE 1 Flow rates given in this table prevent the accumulation of the electrostatic charge on the surface of
the liquid reaching unacceptable levels.
NOTE 2 Information on product sulphur content and conductivity would normally be provided by the terminal
operator.
NOTE 3 Values in brackets apply to non high speed loading tank-vehicles.
NOTE 4 The maximum loading rates given in Table 1 may be reduced for safety reasons depending upon
specific circumstances.
NOTE 5 DN = d × 1 000.
a
mg/kg = mass fraction (ppm).
b
DN = diameter (nominal) of loading pipe (mm).
c
v × d = flow velocity in metres per second [m/sec] × nominal internal pipe diameter in metres [m].
d
Reduced flow rates are applicable in arctic or severe winter conditions.
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4.2.2 Maximum liquid pressure
Where systems include valves that can be closed against the loading flow, including pressure-balanced
valves, it should be ensured that:
the maximum static pressure in the pipework upstream of the isolating valve does not exceed 1 Mpa;
pressure-balanced footvalves conform to EN 13316.
4.2.3 Maximum vapour back pressure
The maximum back-pressure created by the gantry vapour recovery system should be 5,5 kPa (55 mbar).
NOTE The maximum back pressure of 5,5 kPa is a requirement of the VOC Directive 94/63/EC.
Controls may be provided to ensure that this maximum back pressure is not exceeded.
4.3 Loading operations
Before loading is permitted, procedures should exist to ensure that there is authorisation to load and to
accommodate the loading of both empty and not-empty compartments. For not-empty compartments, the
volume and grade of the retained goods should be determined prior to loading.
If the surface on which the tank truck is standing is not conductive (see CLC/TR 50404 for guidance), the tank
truck should be bonded to earth before any operation (e.g. opening fill covers, connecting loading couplers) is
6
carried out. The bonding resistance between the tank truck and the gantry should be 10 ohms or less.
Procedures should exist to ensure that overloading does not occur.
5 Tank truck function and equipment
5.1 Tank truck compartment – Compartment identification
The tank truck compartments should be clearly identified with the numbering starting from the front of the tank
(see Annex C).
5.2 Tank truck compartment — Control of static electricity
5.2.1 General
As an electrostatic charge is generated within the dangerous goods whenever they are being loaded into a
tank truck, precautions should be taken to ensure the safe dissipation of the charge.
Metal-to-metal connections should have an electrical continuity of 10 ohms or less.
6
Non-metallic conductive components should be installed such that electrical continuity of 10 ohms or less
exists across the interface to the adjacent component.
Where the functionality of an electrical system requires one or more insulating blocks to be inserted between
components, it should be ensured that the electrical continuity across the components does not exceed
6
10 ohms.
The tank should be mounted such that there is electrical continuity of 10 ohms or less between the tank and
6
wheel rims and 10 ohms or less between the tank and a conductive road surface.
Spray deflectors or other methods should be used to minimise spraying and jetting of liquid from the
footvalves during the loading process.
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5.2.2 Central conductor
Tank trucks where all compartments meet the criteria given in the following list may be referred to as high
speed loading tank trucks. Other tank trucks should be deemed as non high speed loading tank trucks
(see 4.2.1 for effect on loading rates). Every tank truck should carry either a document or an indelibly marked
plate (see Annex C) or both identifying whether it is a high speed loading tank truck or a non high speed
loading tank truck.
For high speed loading tank trucks, compartments and any chamber therein should:
a) have a nominal capacity < 2 000 l; or
b) have a nominal capacity ≥ 2 000 l and ≤ 15 000 l, and be equipped with
1) at least one full height baffle or surge plate; or
2) at least one central conductor, so that no part of the liquid surface, in plan view, is > 0,8 m from one
of the conductors or the tank shell; or
c) have a nominal capacity > 15 000 l.
NOTE A chamber is the space created in a compartment when that compartment is subdivided by baffles or surge
plates into spaces of smaller capacity (as per CLC/TR 50404).
A central conductor should be an electrically continuous metallic uninsulated cable, wire or tube, which has
electrical continuity with the tank shell of ≤ 10 ohms.
If a cable or wire, the central conductor should:
have a diameter ≥ 2 mm and ≤ 10 mm, or ≥ 50 mm;
be fixed to the roof and to the floor of the compartment or chamber; and
have sufficient strength to withstand flexing caused by loading and transport operations, including its end
fittings and attachments.
If a tube (which may be a dip, drain, service or vapour recovery tube), the central conductor should:
have a diameter ≥ 50 mm; and
be fixed to the roof of the compartment or chamber and continued to the floor or vice versa.
A central conductor should not retain product.
Any overfill or other probe in a compartment should be fitted < 0,5 m from a compartment division, or a baffle,
surge plate or central conductor.
5.3 Tank truck loading equipment
5.3.1 Tank contents determination
Provision should be made for determining the empty or not-empty condition of each tank truck compartment
prior to loading.
A plate, as shown in Annex C, should be fitted adjacent to the adaptor showing the maximum permissible
filling volume of each compartment.
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5.3.2 Adaptor for bottom loading and unloading
The bottom loading adaptor should conform to EN 13083. If the system is fitted with valves which can be
closed against the loading flow, e.g. pressure balanced footvalves conforming to EN 13316, a surge pressure
of 2 500 kPa should not compromise the integrity or functions of the adaptor/coupler.
NOTE In the arctic region, bottom loading adaptors with the same functionality but with a reduced diameter are
commonly used.
The adaptors should be located as described in Annex A to allow the connection of couplers.
5.3.3 Footvalves
Non-pressure balanced footvalves should conform to EN 13308.
Pressure balanced footvalves should conform to EN 13316.
Before the footvalve in the tank compartment is opened, the vapour transfer valve should be open. The
footvalve should be open before loading commences.
The footvalve should be closed before the loading or discharge connections are broken.
For pipe systems with pressure balanced footvalves, a pressure relieving device should be installed between
the footvalve and loading/unloading adaptor to prevent over-pressurisation of the pipeline from thermal
expansion of the liquid.
5.3.4 Cap for the bottom loading/unloading adaptor
The drip cap fitted to the bottom loading/unloading adaptor should conform to EN16249.
5.4 Vapour collection system
5.4.1 General conditions
In order to ensure that vapour is not emitted to atmosphere when the terminal vapour collection system
generates a back-pressure of up to 5,5 kPa, care should be taken when designing, operating and maintaining
the vapour collection system of the tank truck.
Vents fitted to the compartment, vapour manifold and vapour pipework should be designed and controlled
such that vapours from the storage installations at the service stations or terminals are retained, except for the
release of internal overpressure and vacuum through the pressure and breather vents (EN 14595).
NOTE 1 The release of internal overpressure and vacuum through the pressure and vacuum breather vents
(EN 14595) is a requirement of Directive 94/63 on the control of volatile organic compound (VOC) emissions.
NOTE 2 The vapour collection systems of tank trucks differ depending on whether:
type 1: the pressure and vacuum breather vents exhaust directly to atmosphere; or
type 2: the pressure and vacuum breather vents exhaust into the vapour collection manifold.
To load the maximum number of compartments simultaneously without vapours escaping into the
atmosphere, the following should be taken into account:
the pressure drop of all components installed in the vapour collection system;
the pressure drop of vapour collection pipework;
the maximum permitted back pressure of 5,5 kPa (55 mbar).
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To allow bottom loading gantries to collect all vapours displaced from a tank truck being loaded, the vapour
collection system should be leakproof in accordance with EN 12972.
5.4.2 Vapour collection manifold
A vapour collection manifold should be used when loading or unloading a tank truck with more than one
compartment. Where the coaming is used as a vapour manifold, it should be considered as part of the vapour
pipework.
A common manifold is suitable for vapour collection when loading or unloading and may be either a separate
pipe or the rollover coaming.
The vapour transfer valves should seal the vapour collection manifold from the compartments during
transport, except where they incorporate a pressure and vacuum breather vent. Whichever system is used,
the manifold should be sealed to atmosphere when a vapour recovery coupler is connected.
The vapour collection system should be provided with a facility to detect the presence of liquid (e.g. sight
glass). Where necessary it should be adequately protected against possible over-pressure due to thermal
expansion.
5.4.3 Vapour transfer valves
The vapour transfer valves should conform to EN 13082.
Vapour transfer valves should be open before loading or discharge commences.
5.4.4 Pressure and vacuum breather vents
Each compartment should be fitted with a pressure and vacuum breather vent conforming to EN 14595. The
pressure breathing capacity should be sufficient to ensure that the maximum working pressure of the tank is
not exceeded. The vacuum breathing capacity should be sufficient to ensure that the maximum vacuum rating
of the tank is not exceeded under either a gravity or a pumped discharge.
5.4.5 Flame arresters
In order to protect the tank and its contents, together with any vapour pipework, from possible ignition
sources, a flame arrester should be fitted to all valves which can breathe directly to atmosphere (excluding the
emergency pressure relief valve according to EN 14596 where fitted).
Flame arresters should be of the "end of line deflagration flame arrester" type, that meet the requirements of
ISO 16852:2008, 7.3.2.1 Flame Transmission Test, referred to in section 6.9, Table 5 for gas group IIA.
For 100 % ethanol and petroleum fuels containing more than 90 % ethanol, then the test shall be as above but
for gas group IIB(1).
5.4.6 Vapour collection adaptor
The vapour collection adaptor should conform to EN 13081.
The adaptor should be operationally compatible with the coupler for vapour recovery and should be located
within the tank connection envelope as described in Annex A.
NOTE In the arctic region, a vapour collection adaptor with the same functionality but with a reduced diameter are
commonly used.
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5.4.7 Interlocks
Interlocks should be provided on the tank truck to ensure that:
the vapour collection coupler is connected to the vapour collection adaptor before loading can
commence;
the vapour transfer valve is open before loading of the relevant tank compartment can commence.
The interlocks should be linked into the level detection/secondary shut-off system according to EN 13922 such
that the permissive signal is not obtained if these conditions are not met.
5.4.8 Vapour flow performance test/calculation
The maximum number of tank compartments that may be loaded simultaneously without vapour release
should be identified on a plate permanently attached to the tank truck (see Annex C).
The maximum number of tank compartments that may be loaded simultaneously should be determined for the
tank truck types given in 5.4.1 as follows:
a) For type 1 tank trucks, the test method in Annex B should be used, unless a new, untested type 1 tank
truck presents only minor changes from a previously tested type 1 tank truck design, in which case a
calculation method may alternatively be used.
NOTE Minor changes can be considered to be where:
the number of compartments is not increased;
the pipework bore and coaming cross section are not reduced;
all intersections of pipework are identical in form;
the internal surfaces of the pipework and coaming are identical in form;
there are an equal or lower number of compartment vapour lines entering the coaming manifold on a given side of
the entrance into the vapour downpipe;
the vapour transfer vent valves are the same make and type;
the vapour adaptor is the same make and type.
b) For type 2 tank trucks, either the test method in Annex B or a calculation method can be used.
5.5 High level detection
5.5.1 Overfill prevention sensor
In each tank compartment, an overfill prevention sensor conforming to EN 13922 should be mounted and
should be set in accordance with Annex D to prevent liquid being loaded into the body of the transfer valve.
Tank compartments should be individually calibrated to ensure the correct setting of the sensor and
verification of the net ullage.
Any overfill prevention sensor should be installed < 0,5 m from a compartment division, baffle, surge plate or
central conductor.
The dimension from the sensor reference plane to the sensor trigger level may be identified on a plate
permanently attached adjacent to the tank manufacturer’s identification plate (see Annex C).
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SIST-TP CEN/TR 15120:2013
CEN/TR 15120:2013 (E)
5.5.2 Gantry connection — Socket location
The 10 pin socket should be located within the tank connection envelope in accordance with Annex A.
5.6 Other tank truck equipment
5.6.1 Manhole cover assembly
Manhole cover assemblies (
...
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