Tanks for transport of dangerous goods - Guidance and recommendations for loading, transport and unloading

This document gives guidance and recommendations for loading at terminals and discharge at service stations or customer premises of tank-vehicles transporting dangerous substances of Class 3 of ADR - European Agreement concerning the International Carriage of Dangerous Goods by Road [2] - (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 Befüllung, Beförderung und Entladung

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

General Information

Status
Published
Public Enquiry End Date
01-Jul-2022
Publication Date
13-Nov-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Oct-2022
Due Date
15-Dec-2022
Completion Date
14-Nov-2022

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SLOVENSKI STANDARD
SIST-TP CEN/TR 15120:2022
01-december-2022
Nadomešča:
SIST-TP CEN/TR 15120:2013

Cisterne za prevoz nevarnega blaga - Navodila in priporočila za polnjenje, prevoz

in praznjenje

Tanks for transport of dangerous goods - Guidance and recommendations for loading,

transport and unloading
Tanks für die Beförderung gefährlicher Güter - Leitlinien und Empfehlungen für
Befüllung, Beförderung und Entladung
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 15120:2022
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 15120:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CEN/TR 15120:2022
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SIST-TP CEN/TR 15120:2022
CEN/TR 15120
TECHNICAL REPORT
RAPPORT TECHNIQUE
August 2022
TECHNISCHER REPORT
ICS 13.300; 23.020.20 Supersedes CEN/TR 15120:2013
English Version
Tanks for transport of dangerous goods - Guidance and
recommendations for loading, transport and unloading

Citernes destinées au transport de matières Tanks für die Beförderung gefährlicher Güter -

dangereuses - Lignes directrices et recommandations Leitlinien und Empfehlungen für Befüllung,

pour le chargement, le transport et le déchargement Beförderung und Entladung

This Technical Report was approved by CEN on 22 August 2022. 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, 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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 15120:2022 E

worldwide for CEN national Members.
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SIST-TP CEN/TR 15120:2022
CEN/TR 15120:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope ......................................................................................................................................................................... 6

2 Normative references.......................................................................................................................................... 6

3 Terms and definitions ......................................................................................................................................... 6

4 Bottom loading gantry function and operation ......................................................................................... 6

4.1 Gantry loading equipment ........................................................................................................................ 6

4.2 Loading conditions ...................................................................................................................................... 8

4.3 Loading operations...................................................................................................................................... 8

4.4 Permissive to load ....................................................................................................................................... 9

5 Tank-vehicle type, function, and equipment .............................................................................................. 9

5.1 General ............................................................................................................................................................. 9

5.2 Tank-vehicle compartment identification ....................................................................................... 10

5.3 Tank-vehicle Control of static electricity ......................................................................................... 10

5.4 Tank-vehicle loading equipment ........................................................................................................ 11

5.5 Vapour collection system ....................................................................................................................... 12

5.6 Breather devices and flame arresters ............................................................................................... 16

5.7 High level detection ................................................................................................................................. 18

5.8 Other tank-vehicle service equipment .............................................................................................. 18

5.9 Tank-vehicle safety systems ................................................................................................................. 20

5.10 Metering and Tank contents measurement systems ................................................................... 21

6 Electrical equipment ........................................................................................................................................ 21

7 Tank-vehicle data system interfaces .......................................................................................................... 22

8 Conditions of operation ................................................................................................................................... 22

8.1 Weather conditions .................................................................................................................................. 22

8.2 Switch loading ............................................................................................................................................ 22

8.3 Leak monitoring ........................................................................................................................................ 22

9 Loading pass ........................................................................................................................................................ 22

10 Discharge .............................................................................................................................................................. 23

10.1 General .......................................................................................................................................................... 23

10.2 Site assessment .......................................................................................................................................... 23

10.3 Control of electrical conductivity ........................................................................................................ 24

10.4 Maximum delivery rates ......................................................................................................................... 24

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CEN/TR 15120:2022 (E)

10.5 Safety precautions ..................................................................................................................................... 25

10.6 Checks prior to discharge ....................................................................................................................... 25

10.7 Discharge procedure ................................................................................................................................ 25

10.8 Frustrated deliveries ............................................................................................................................... 26

10.9 Completion of delivery ............................................................................................................................ 26

Annex A (informative) Tank connection envelope ......................................................................................... 28

Annex B (informative) Guidelines for the design, fabrication and testing of a vapour manifold .. 32

Annex C (informative) Information plate .......................................................................................................... 38

Annex D (informative) Overfill prevention sensor setting .......................................................................... 40

Annex E (informative) Illustration of when an explosive atmosphere might be present or might

arise during loading operations ............................................................................................................................ 42

Annex F (informative) Loading pass scheme .................................................................................................... 44

Annex G (informative) Vehicles and compartments suitable for high-speed loading ....................... 48

Annex H (informative) Loading velocity rates for road tankers ............................................................... 49

Bibliography ................................................................................................................................................................. 50

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CEN/TR 15120:2022 (E)
European foreword

This document (CEN/TR 15120:2022) 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 shall not be held responsible for identifying any or all such patent rights.

This document supersedes CEN/TR 15120:2013.

In comparison with the previous edition, the following technical modifications have been made:

Total revision including:
— Redraft to reflect current format rules;
— Development of recommendations on:
— New mixtures and substances;
— Protection against electrostatic hazards;
— The difference between type 1 and type 2 tank-vehicle designs;
— Vapour collection breather device operation;
— Vapour Manifold Vent Valve operation;
— Vapour manifold design, fabrication, and test;
— Revision of annexes.

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.
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SIST-TP CEN/TR 15120:2022
CEN/TR 15120:2022 (E)
Introduction

This document provides guidance and recommendations to enable the transfer of product and vapour

between the loading gantry, the tank-vehicle, and the service station.

The European Parliament and Council Directive 94/63/EC (VOC Directive) [1] 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 document acknowledges that, for historical, climatic, and logistical reasons, alternative technical

solutions are commonly used nationally and in the Arctic Region.
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CEN/TR 15120:2022 (E)
1 Scope

This document gives guidance and recommendations for loading at terminals and discharge at service

stations or customer premises of tank-vehicles transporting dangerous substances of Class 3 of ADR –

European Agreement concerning the International Carriage of Dangerous Goods by Road [2] –

(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
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Bottom loading gantry function and operation
4.1 Gantry loading equipment
4.1.1 General

It is recommended that arrangements to permit loading of a tank-vehicle, equipped according to this

document, are available to all gantries on loading facilities and at least one at each loading facility in arctic

regions.
NOTE The arctic region comprises Denmark, Finland, Iceland, Norway and Sweden.
4.1.2 Overfill prevention – gantry meter pre-set

The primary overfill prevention system is provided by the pre-setting of the gantry loading meter by the

tank-vehicle loader for each tank-vehicle compartment, separately, before it is loaded.

Therefore, it is recommended that bottom loading is only be permitted at gantries fitted with such pre-

set meters to limit the volume loaded into each tank-vehicle compartment.

NOTE 1 Overfill is the filling of a tank-vehicle or one or more of its compartments to the extent that the total

volume loaded into a compartment exceeds the maximum permitted volume for transport (see Annex D).

NOTE 2 Overloading is the loading of a tank-vehicle 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 authorized weight for that

axle and for a semi-trailer, when its coupling to the tractor is loaded to an extent that it exceeds its design load.

4.1.3 Overfill prevention – overfill prevention system (OPS)

The secondary overfill prevention system is provided by the overfill prevention system. The secondary

system is a safety system which comes into operation when the primary system fails to operate.

To ensure interoperability, it is recommended that the gantry-based components of the overfill

prevention system conform to EN 13922 [3].
Annex A shows the location envelope of the tank-vehicle socket.
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CEN/TR 15120:2022 (E)

NOTE The tank-vehicle component of the overfill prevention system (OPS) comprises the sensor or sensor

circuits, and interface socket and all connecting wiring and cables.

The gantry component of the OPS comprises the interface plug, cable, and gantry controller which, when a sensor

on the tank-vehicle detects liquid, provides an output to close the gantry control valve and stop product flow.

4.1.4 Coupler for bottom loading

For interoperability and safety reasons bottom loading gantries use couplers which are compatible with

the adaptors for bottom loading (EN 13083 [4]) installed on the tank-vehicle.
Annex A shows the tank connection envelope of these adaptors on a tank-vehicle.
NOTE 1 This envelope is defined by the VOC Directive.

Tank-vehicles fitted with pressure balanced footvalves that close against product flow, may cause a surge

pressure of 2 500 kPa within the loading coupler and pipework. It is important that loading facilities are

capable of absorbing such surge pressures without compromise or loss of function.

NOTE 2 The type of foot valve (pressure balanced or non-pressure balanced) installed on the tank-vehicle is

identified on an information plate attached to the tank-vehicle (see Annex C).

Loading facilities not capable of absorbing high surge pressures are not recommended to accept tank-

vehicles fitted with pressure balanced footvalves.

To prevent the accumulation of any electrostatic charge, it is recommended that the electrical resistance

across a metallic coupler and adaptor is less than 10 Ω, and less than 10 Ω in other cases (e.g. non-metallic

coupler/adaptor or devices isolated for product identification purposes), when connected.

NOTE 3 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

For interoperability and safety reasons bottom loading gantries use vapour collection couplers which are

compatible with the vapour collection adaptors (EN 13081 [5]) installed on the tank-vehicle.

Annex A shows the tank connection envelope of these adaptors on a tank-vehicle.
NOTE 1 This envelope is defined by the VOC Directive.

For compliance with the VOC Directive, loading is not permitted unless the vapour collection hose has

been connected to the vehicle and there is a free passage for the displaced vapours to flow from the tank-

vehicle into the gantry’s vapour collection system. This interlock may either use the overfill prevention

system or be self-contained within the gantry’s control system.

NOTE 2 In the arctic region, vapour collection couplers with the same functionality but with a reduced diameter

are commonly used.
4.1.6 Unauthorized drive away restriction

It is recommended that methods to stop the unauthorized driving away of the tank-vehicle, either by

means of a gantry installed system or a system integrated within the vehicle controls, are installed at each

loading bay.

Whatever method is used, it is recommended that the restriction engages prior to and during loading and

is only able to be released after completion of loading and once all loading arms and other gantry

equipment are properly parked.
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CEN/TR 15120:2022 (E)
4.2 Loading conditions
4.2.1 Maximum loading rates per loading arm

As noted in IEC/TS 60079-32-1:2013 [6], many operations with flammable liquids produce flammable

atmospheres by evaporation of the liquid being handled. Where tanks are exposed to direct sunlight and

liquid temperatures are not monitored it may be assumed that a flammable atmosphere could be present

when handling liquids with flash points up to 60 C. In areas of high ambient temperature and strong

sunlight, flammable atmospheres may occur even with liquids that have flash points above 60 C.

In some circumstances, the flammable atmosphere is not due to the liquid being handled but due to

residues of volatile liquid or vapour from earlier operations with the same equipment or from nearby

operations. Residual vapours may occur during switch loading, in which a liquid having a high flash point

(e.g. diesel) is loaded into a tank which previously contained a liquid with a low flash point (e.g. petrol).

To minimize the danger of electrostatic hazards, IEC/TS 60079-32-1 recommends that, for petroleum

products, the maximum product of velocity and pipe diameter (vd) is 0,5 m /s subject to a maximum

product loading velocity of 7 m/s.

For a conventional (100 mm) bottom loading system, this vd is equivalent to a maximum loading rate of

2 400 l/m (see Annex H).

It is also recommended that the tank-vehicle be suitable for high-speed loading (see 5.3.2).

NOTE Refer to IEC/TS 60079-32-1:2013, Clause 7 for more details of these recommendations, and for

recommendations for other products and when new products are being considered for loading as their electrostatic

criteria might be significantly different from that of the more conventional products. For example, conventional

petroleum is classed as low conductivity whilst the addition of 10 % or more ethanol changes the classification to

high conductivity.

To prevent static discharge caused by spraying at the footvalve, it is recommended that the loading rate is kept low

until the footvalve is completely immersed in the product. Once the footvalve is fully submerged, the loading rate

may then be increased.
4.2.2 Maximum liquid pressure

Where systems include valves that can be closed against the loading flow, including pressure-balanced

valves, it is recommended that the maximum static pressure in the pipework upstream of these valves

never exceeds 1 000 kPa (10 bar). (See 5.4.3).
4.2.3 Maximum vapour back pressure

The maximum back pressure created by the gantry vapour recovery system is 5,5 kPa (55 mbar). Controls

may be provided by the terminal to ensure that this maximum back pressure is not exceeded, (e.g. limit

the number of tank-vehicles being loaded simultaneously).

NOTE The maximum back pressure of 5,5 kPa is a requirement of the VOC Directive 94/63/EC.

4.3 Loading operations
4.3.1 General

It is recommended that, before loading is permitted, procedures exist to ensure that:

— there is authorization to load (see note); and
— the tank-vehicle is immobilized; and
— the loading of both empty and not-empty compartments is accommodated; and
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CEN/TR 15120:2022 (E)
— overloading, overfilling or contaminations do not occur; and
— an earthing cable is connected.

NOTE The authorization of a tank-vehicle loader by a terminal operator to load the required goods into the

tank-vehicle follows the verification of his or her competence including any required certification and its associated

validity.
4.3.2 Earthing cable

As noted in IEC/TS 60079-32-1:2013, the earthing cable, which is connected to the tank-vehicle during

any loading operation, provides a resistance of less than 10 Ω between the tank-vehicle and the gantry’s

designated earthing point.

It is recommended that this earthing cable is part of a static earth monitoring system that continuously

monitors the resistance between the tank-vehicle and the gantry’s designated earthing point and

activates interlocks to prevent loading when this resistance exceeds 10 Ω. It is also recommended that

this earth monitoring system is be capable of differentiating between connection to the tank-vehicle’s

shell and any non-bonded metallic item.

It is recommended that an earthing connection is established before any other connections are made.

These functions may be provided by the overfill prevention system, through the plug/socket connection.

4.4 Permissive to load

It is recommended that product loading at a bottom loading vapour recovery gantry is permitted to

commence only once the following conditions are met:

— Tank-vehicle is parked and confirmed to be suitable for loading the nominated products; and

— The earthing cable is connected; and

— Vapour path from tank compartment through to gantry recovery system is open; and

— Overfill prevention system is connected and provides a permissive signal; and

— Any other local condition (e.g. product identification system) is confirmed as operational.

5 Tank-vehicle type, function, and equipment
5.1 General

As noted in the Scope, this guidance covers tank-vehicles coded as LGBF by the regulations.

NOTE 1 See ADR clause 4.3.4.1.1 for the explanation of this coding.

The design of the tank shell may be in accordance with EN 13094 [7], EN 14025 [8] or any other approved

procedure, however the coding will remain the same.

It is not recommended that tank shells manufactured from insulating materials are used for the transport

of flammable liquids (see IEC/TS 60079-32-1:2013, 7.3.4.6).

These tank-vehicles are considered to have Gravity Discharge shells and, as the classification suggests,

rely on gravity to fully discharge the liquid product. To prevent excessive VOC vapours being released to

atmosphere, and to accommodate the expansion and contraction of the liquid product caused by

atmospheric pressure and temperature change, these tanks are fitted with breather devices, and safety

devices to prevent the contents from spilling out if the tank overturns.
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CEN/TR 15120:2022 (E)

Gravity discharge tanks may also employ product approved cargo pumps to assist in the delivery process,

however, such assistance is not permitted to pressurize the tank shell.

The breather devices may breathe to atmosphere either directly (type 1) or through the vapour manifold

(type 2). (See 5.5.1).

These tank-vehicles may also be used for the transport of fuels containing bio substances which may not

be classed as dangerous goods.

NOTE 2 If the product’s flash point is above 60 °C then it is generally not classified as a dangerous good. Diesel,

Heating oil and Gasoil are classified as dangerous goods if their flash point is between 60 °C and 100 °C.

In all cases, it is recommended that the Competent Authority’s opinion is sought as to whether a product

is a dangerous good or not, as different Nations may have different rules.
Examples of biofuels are:

— Biodiesel – composed of vegetable-based oil, usually fatty-acid esters. This can be combined with

mineral-based diesel to a produce a mixture, a fuel classed as B5 would contain 5 % biodiesel and

95 % mineral diesel. A fuel classed as B100 would be composed of 100 % biodiesel. Biodiesel has a

higher flash point than mineral diesel. Biodiesel with a flash point above 100 °C is not classified as a

dangerous goods. Biodiesel with a flash point below 100 °C and above 60 °C is classified as UN 1202.

— Bioethanol – composed of ethanol usually mixed with petrol. A fuel classed as E5 would contain 5 %

ethanol and 95% petrol. Fuel classed as E100 would be composed of 100 % ethanol. Bioethanol is

classed as a dangerous good. Where ethanol is more than 10 % of the fuel mixture but less than

100 %, the mixture is classified as UN3475. For mixtures with less than 10 % ethanol, classification

would be UN1203 and if the mixture is 100 % ethanol, the classification is UN1170.

— Vegetable Oil – this has a flash point above 100 °C and is generally not classed as a dangerous good.

NOTE 3 Switch loading, and manifolded vapour recovery systems can result in the tank vehicle compartment

containing a mixture of residual products and vapours. (See 8.2.)
5.2 Tank-vehicle compartment identification

It is recommended that the tank-vehicle compartments are clearly identified with their number and their

maximum pre-set volume, starting from the front of the tank (see Annex C).
5.3 Tank-vehicle Control of static electricity
5.3.1 General

As an electrostatic charge is generated within the dangerous goods whenever they are being loaded into

a tank-vehicle, it is recommended that precautions are taken to ensure the safe dissipation of the charge.

Typical precautions being:
— Electrical continuity between metal-to-metal connections to be 10 Ω or less.

— Non-metallic conductive components are installed such that electrical continuity of 10 Ω 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, the electrical continuity across the components does not exceed 10 Ω.

— the electrical continuity between the tank-vehicle shell and the chassis to be 10 Ω or less.

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CEN/TR 15120:2022 (E)

— The tank shell to be mounted such that there is electrical continuity of 1 000 Ω or less between the

tank shell and wheel rims and 10 Ω or less between the tank shell and a conductive road surface.

— Spray deflectors or other methods may be used to minimize spraying and jetting of liquid from the

footvalves during the loading process.

NOTE The design of a footvalve bonnet or poppet might not provide a reliable means of determining whether,

as installed, the jetting or spraying of product during loading will occur since it can also be dependent on the

installation of the footvalve to its mounting flange and the flange to the tank.
5.3.2 Tank-vehicles suitable for high-speed loading

IEC/TS 60079-32-1:2013, 7.3.2.3.5.4, Table 11 specifies the requirements for a tank-vehicle to be

classified as suitable for high-speed loading (this table is shown in Annex G).
5.3.3 Earthing

It is recommended that the tank-vehicle is fitted with an easily identifiable earth fitting to which an

earthing cable, conforming to IEC/TS 60079-32-1, may be connected.
NOTE Reference can be made to ADR clause 6.8.2.1.27.

The earthing connection may be a separate cable (including clamp) or integrated with the overfill

prevention system as described in EN 13922.

In the arctic region where the alternative 2 wire PTC thermistor is used, a separate static earthing cable

is recommended.
5.4 Tank-vehicle loading equipment
5.4.1 Tank contents determination

For safety and operational purposes, it is important that the empty or not-empty condition of each tank-

vehicle compartment and run-off pipework is determined prior to loading.

This may be achieved by means of sight glasses or wet-leg sensors with the footvalve open.

NOTE 1 An empty compartment contains less than 0,2 % of the compartment’s nominal capacity or 5 l,

whichever is the least.
NOTE 2 Metrological requirements might be more severe.
The use of product grade indicators is recommended.
5.4.2 Adaptor for bottom loading and unloading
It is recommended that the bo
...

SLOVENSKI STANDARD
kSIST-TP FprCEN/TR 15120:2022
01-junij-2022

Cisterne za prevoz nevarnega blaga - Navodila in priporočila za polnjenje, prevoz

in praznjenje

Tanks for transport of dangerous goods - Guidance and recommendations for loading,

transport and unloading
Tanks für die Beförderung gefährlicher Güter - Leitlinien und Empfehlungen für
Befüllung, Beförderung und Entladung
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: FprCEN/TR 15120
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
kSIST-TP FprCEN/TR 15120:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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kSIST-TP FprCEN/TR 15120:2022
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kSIST-TP FprCEN/TR 15120:2022
FINAL DRAFT
TECHNICAL REPORT
FprCEN/TR 15120
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
April 2022
ICS Will supersede CEN/TR 15120:2013
English Version
Tanks for transport of dangerous goods - Guidance and
recommendations for loading, transport and unloading

Citernes destinées au transport de matières Tanks für die Beförderung gefährlicher Güter -

dangereuses - Lignes directrices et recommandations Leitlinien und Empfehlungen für Befüllung,

pour le chargement, le transport et le déchargement Beförderung und Entladung

This draft Technical Report is submitted to CEN members for Vote. 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, 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, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a Technical Report. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a Technical Report.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TR 15120:2022 E

worldwide for CEN national Members.
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kSIST-TP FprCEN/TR 15120:2022
FprCEN/TR 15120:2022 (E)
Contents Page

European foreword ...................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope ......................................................................................................................................................................... 6

2 Normative references ......................................................................................................................................... 6

3 Terms and definitions ......................................................................................................................................... 6

4 Bottom loading gantry function and operation ......................................................................................... 6

4.1 Gantry loading equipment .............................................................................................................................. 6

4.2 Loading conditions ............................................................................................................................................ 8

4.3 Loading operations ........................................................................................................................................... 8

4.4 Permissive to load ............................................................................................................................................. 9

5 Tank-vehicle type, function, and equipment .............................................................................................. 9

5.1 General ................................................................................................................................................................... 9

5.2 Tank-vehicle compartment identification ..............................................................................................10

5.3 Tank-vehicle Control of static electricity ................................................................................................10

5.4 Tank-vehicle loading equipment ...............................................................................................................11

5.5 Vapour collection system ..............................................................................................................................12

5.6 Breather devices & flame arresters ..........................................................................................................16

5.7 High level detection ........................................................................................................................................18

5.8 Other tank-vehicle service equipment .....................................................................................................18

5.9 Tank-vehicle safety systems ........................................................................................................................20

5.10 Metering and Tank contents measurement systems ..........................................................................21

6 Electrical equipment .........................................................................................................................................21

7 Tank-vehicle data system interfaces ...........................................................................................................22

8 Conditions of operation....................................................................................................................................22

8.1 Weather conditions .........................................................................................................................................22

8.2 Switch loading ...................................................................................................................................................22

8.3 Leak monitoring ...............................................................................................................................................22

9 Loading pass .........................................................................................................................................................22

10 Discharge ...............................................................................................................................................................23

10.1 General .................................................................................................................................................................23

10.2 Site assessment .................................................................................................................................................23

10.3 Control of electrical conductivity ...............................................................................................................24

10.4 Maximum delivery rates................................................................................................................................24

10.5 Safety precautions ...........................................................................................................................................25

10.6 Checks prior to discharge .............................................................................................................................25

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10.7 Discharge procedure ................................................................................................................................... 25

10.8 Frustrated deliveries ................................................................................................................................... 26

10.9 Completion of delivery ................................................................................................................................ 26

Annex A (informative) Tank connection envelope ........................................................................................ 28

Annex B (informative) Guidelines for the design, fabrication and testing of a vapour manifold 32

Annex C (informative) Information plate ......................................................................................................... 38

Annex D (informative) Overfill prevention sensor setting ......................................................................... 40

Annex E (informative) Illustration of when an explosive atmosphere might be present or might

arise during loading operations ............................................................................................................................ 42

Annex F (informative) Loading pass scheme ................................................................................................... 44

Annex G (informative) Vehicles and compartments suitable for high-speed loading ...................... 49

Annex H (informative) Loading velocity rates for road tankers............................................................... 50

Bibliography ................................................................................................................................................................. 51

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European foreword

This document (FprCEN/TR 15120:2022) has been prepared by Technical Committee CEN/TC 296

“Tanks for the transport of dangerous goods”, the secretariat of which is held by AFNOR.

This document is currently submitted to the Vote on TR.
This document will supersede CEN/TR 15120:2013.

In comparison with the previous edition, the following technical modifications have been made:

Total revision including:
• Redraft to reflect current format rules,
• Development of recommendations on:
o New mixtures and substances,
o Protection against electrostatic hazards,
o The difference between type 1 and type 2 tank-vehicle designs,
o Vapour collection breather device operation,
o Vapour Manifold Vent Valve operation,
o Vapour manifold design, fabrication, and test,
• Revision of annexes.

This document has been prepared under a Standardization Request given to CEN by the European

Commission and the European Free Trade Association.
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Introduction

This document provides guidance and recommendations to enable the transfer of product and vapour

between the loading gantry, the tank-vehicle, and the service station.

The European Parliament and Council Directive 94/63/EC (VOC Directive) [1] 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 document acknowledges that, for historical, climatic, and logistical reasons, alternative technical

solutions are commonly used nationally and in the Arctic Region.
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1 Scope

This document gives guidance and recommendations for loading at terminals and discharge at service

stations or customer premises of tank-vehicles transporting dangerous substances of Class 3 of ADR -

European Agreement concerning the International Carriage of Dangerous Goods by Road [2] –

(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
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Bottom loading gantry function and operation
4.1 Gantry loading equipment
4.1.1 General

It is recommended that arrangements to permit loading of a tank-vehicle, equipped according to this

document, are available to all gantries on loading facilities and at least one at each loading facility in arctic

regions
NOTE The arctic region comprises Denmark, Finland, Iceland, Norway, and Sweden.
4.1.2 Overfill prevention – gantry meter pre-set

The primary overfill prevention system is provided by the pre-setting of the gantry loading meter by the

tank-vehicle loader for each tank-vehicle compartment, separately, before it is loaded.

Therefore, it is recommended that bottom loading is only be permitted at gantries fitted with such pre-

set meters to limit the volume loaded into each tank-vehicle compartment.

NOTE 1 Overfill is the filling of a tank-vehicle or one or more of its compartments to the extent that the total

volume loaded into a compartment exceeds the maximum permitted volume for transport (see Annex D).

NOTE 2 Overloading is the loading of a tank-vehicle 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 authorized weight for that

axle and for a semi-trailer, when its coupling to the tractor is loaded to an extent that it exceeds its design load.

4.1.3 Overfill prevention – overfill prevention system (OPS)

The secondary overfill prevention system is provided by the overfill prevention system. The secondary

system is a safety system which comes into operation when the primary system fails to operate.

To ensure interoperability, it is recommended that the gantry-based components of the overfill

prevention system conform to EN 13922 [3].
Annex A shows the location envelope of the tank-vehicle socket.
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NOTE The tank-vehicle component of the overfill prevention system (OPS) comprises the sensor or sensor

circuits, and interface socket and all connecting wiring and cables.

The gantry component of the OPS comprises the interface plug, cable, and gantry controller which, when

a sensor on the tank-vehicle detects liquid, provides an output to close the gantry control valve and stop

product flow.
4.1.4 Coupler for bottom loading

For interoperability and safety reasons bottom loading gantries use couplers which are compatible with

the adaptors for bottom loading (EN 13083 [4]) installed on the tank-vehicle.
Annex A shows the tank connection envelope of these adaptors on a tank-vehicle.
NOTE 1 This envelope is defined by the VOC Directive.

Tank-vehicles fitted with pressure balanced footvalves that close against product flow, may cause a surge

pressure of 2 500 kPa within the loading coupler and pipework. It is important that loading facilities are

capable of absorbing such surge pressures without compromise or loss of function.

NOTE 2 The type of foot valve (pressure balanced or non-pressure balanced) installed on the tank-vehicle is

identified on an information plate attached to the tank-vehicle (see Annex C).

Loading facilities not capable of absorbing high surge pressures are not recommended to accept tank-

vehicles fitted with pressure balanced footvalves.

To prevent the accumulation of any electrostatic charge, it is recommended that the electrical resistance

across a metallic coupler and adaptor is less than 10 Ω, and less than 10 Ω in other cases (e.g. non-metallic

coupler/adaptor or devices isolated for product identification purposes), when connected.

NOTE 3 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

For interoperability and safety reasons bottom loading gantries use vapour collection couplers which are

compatible with the vapour collection adaptors (EN 13081 [5]) installed on the tank-vehicle.

Annex A shows the tank connection envelope of these adaptors on a tank-vehicle.
NOTE 1 This envelope is defined by the VOC Directive.

For compliance with the VOC Directive, loading is not permitted unless the vapour collection hose has

been connected to the vehicle and there is a free passage for the displaced vapours to flow from the tank-

vehicle into the gantry’s vapour collection system. This interlock may either use the overfill prevention

system or be self-contained within the gantry’s control system.

NOTE 2 In the arctic region, vapour collection couplers with the same functionality but with a reduced diameter

are commonly used.
4.1.6 Unauthorized drive away restriction

It is recommended that methods to stop the unauthorized driving away of the tank-vehicle, either by

means of a gantry installed system or a system integrated within the vehicle controls, are installed at each

loading bay.

Whatever method is used, it is recommended that the restriction engages prior to and during loading and

is only able to be released after completion of loading and once all loading arms and other gantry

equipment are properly parked.
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4.2 Loading conditions
4.2.1 Maximum loading rates per loading arm

As noted in IEC/TS 60079-32-1:2013 [6], many operations with flammable liquids produce flammable

atmospheres by evaporation of the liquid being handled. Where tanks are exposed to direct sunlight and

liquid temperatures are not monitored it may be assumed that a flammable atmosphere could be present

when handling liquids with flash points up to 60 C. In areas of high ambient temperature and strong

sunlight, flammable atmospheres may occur even with liquids that have flash points above 60 C.

In some circumstances, the flammable atmosphere is not due to the liquid being handled but due to

residues of volatile liquid or vapour from earlier operations with the same equipment or from nearby

operations. Residual vapours may occur during switch loading, in which a liquid having a high flash point

(e.g. diesel) is loaded into a tank which previously contained a liquid with a low flash point (e.g. petrol).

To minimize the danger of electrostatic hazards, IEC/TS 60079-32-1 recommends that, for petroleum

products, the maximum product of velocity and pipe diameter (vd) is 0,5 m /s subject to a maximum

product loading velocity of 7 m/s.

For a conventional (100 mm) bottom loading system, this vd is equivalent to a maximum loading rate of

2,400 l/m (see Annex H).

It is also recommended that the tank-vehicle be suitable for high-speed loading (see 5.3.2).

NOTE Refer to IEC/TS 60079-32-1:2013, Clause 7 for more details of these recommendations, and for

recommendations for other products and when new products are being considered for loading as their electrostatic

criteria might be significantly different from that of the more conventional products. For example, conventional

petroleum is classed as low conductivity whilst the addition of 10 % or more ethanol changes the classification to

high conductivity.

To prevent static discharge caused by spraying at the footvalve, it is recommended that the loading rate

is kept low until the footvalve is completely immersed in the product. Once the footvalve is fully

submerged, the loading rate may then be increased.
4.2.2 Maximum liquid pressure

Where systems include valves that can be closed against the loading flow, including pressure-balanced

valves, it is recommended that the maximum static pressure in the pipework upstream of these valves

never exceeds 1 000 kPa (10 bar). (See 5.4.3).
4.2.3 Maximum vapour back pressure

The maximum back pressure created by the gantry vapour recovery system is 5,5 kPa (55 mbar). Controls

may be provided by the terminal to ensure that this maximum back pressure is not exceeded, (e.g. limit

the number of tank-vehicles being loaded simultaneously).

NOTE The maximum back pressure of 5,5 kPa is a requirement of the VOC Directive 94/63/EC.

4.3 Loading operations
4.3.1 General

It is recommended that, before loading is permitted, procedures exist to ensure that:

— there is authorization to load (see note), and
— the tank-vehicle is immobilized, and
— the loading of both empty and not-empty compartments is accommodated, and
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— overloading, overfilling or contaminations do not occur, and
— an earthing cable is connected.

NOTE The authorization of a tank-vehicle loader by a terminal operator to load the required goods into the

tank-vehicle follows the verification of his or her competence including any required certification and its associated

validity.
4.3.2 Earthing cable

As noted in IEC/TS 60079-32-1:2013, the earthing cable, which is connected to the tank-vehicle during

any loading operation, provides a resistance of less than 10 Ω between the tank-vehicle and the gantry’s

designated earthing point.

It is recommended that this earthing cable is part of a static earth monitoring system that continuously

monitors the resistance between the tank-vehicle and the gantry’s designated earthing point and

activates interlocks to prevent loading when this resistance exceeds 10 Ω. It is also recommended that

this earth monitoring system is be capable of differentiating between connection to the tank-vehicle’s

shell and any non-bonded metallic item.

It is recommended that an earthing connection is established before any other connections are made.

These functions may be provided by the overfill prevention system, through the plug/socket connection.

4.4 Permissive to load

It is recommended that product loading at a bottom loading vapour recovery gantry is permitted to

commence only once the following conditions are met:

• Tank-vehicle is parked and confirmed to be suitable for loading the nominated products, and

• The earthing cable is connected, and

• Vapour path from tank compartment through to gantry recovery system is open, and

• Overfill prevention system is connected and provides a permissive signal, and

• Any other local condition (e.g. product identification system) is confirmed as operational.

5 Tank-vehicle type, function, and equipment
5.1 General

As noted in the Scope, this guidance covers tank-vehicles coded as LGBF by the regulations.

NOTE 1 See ADR clause 4.3.4.1.1 for the explanation of this coding.

The design of the tank shell may be in accordance with EN 13094[7], EN 14025[8] or any other approved

procedure, however the coding will remain the same.

it is not recommended that tank shells manufactured from insulating materials are used for the transport

of flammable liquids (see IEC/TS 60079-32-1, 7.3.4.6).

These tank-vehicles are considered to have Gravity Discharge shells and, as the classification suggests,

rely on gravity to fully discharge the liquid product. To prevent excessive VOC vapours being released to

atmosphere, and to accommodate the expansion and contraction of the liquid product caused by

atmospheric pressure and temperature change, these tanks are fitted with breather devices, and safety

devices to prevent the contents from spilling out if the tank overturns.
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Gravity discharge tanks may also employ product approved cargo pumps to assist in the delivery process,

however, such assistance is not permitted to pressurize the tank shell.

The breather devices may breathe to atmosphere either directly (type 1) or through the vapour manifold

(type 2). (See 5.5.1).

These tank-vehicles may also be used for the transport of fuels containing bio substances which may not

be classed as dangerous goods.

NOTE 2 If the product’s flash point is above 60 °C then it is generally not classified as a dangerous good. Diesel,

Heating oil and Gasoil are classified as dangerous goods if their flash point is between 60 °C and 100 °C.

In all cases, it is recommended that the Competent Authority’s opinion is sought as to whether a product

is a dangerous good or not, as different Nations may have different rules.
Examples of biofuels are:

• Biodiesel – composed of vegetable-based oil, usually fatty-acid esters. This can be combined with

mineral-based diesel to a produce a mixture, a fuel classed as B5 would contain 5 % biodiesel and

95 % mineral diesel. A fuel classed as B100 would be composed of 100 % biodiesel. Biodiesel has a

higher flash point than mineral diesel. Biodiesel with a flash point above 100 °C is not classified as a

dangerous goods. Biodiesel with a flash point below 100 °C and above 60 °C is classified as UN 1202.

• Bioethanol – composed of ethanol usually mixed with petrol. A fuel classed as E5 would contain 5 %

ethanol and 95% petrol. Fuel classed as E100 would be composed of 100 % ethanol. Bioethanol is

classed as a dangerous good. Where ethanol is more than 10 % of the fuel mixture but less than

100 %, the mixture is classified as UN3475. For mixtures with less than 10 % ethanol, classification

would be UN1203 and if the mixture is 100 % ethanol, the classification is UN1170.

• Vegetable Oil – this has a flash point above 100 °C and is generally not classed as a dangerous good.

NOTE 3 Switch loading, and manifolded vapour recovery systems can result in the tank vehicle compartment

containing a mixture of residual products and vapours. (See 8.2.)
5.2 Tank-vehicle compartment identification

It is recommended that the tank-vehicle compartments are clearly identified with their number and their

maximum pre-set volume, starting from the front of the tank (see Annex C).
5.3 Tank-vehicle Control of static electricity
5.3.1 General

As an electrostatic charge is generated within the dangerous goods whenever they are being loaded into

a tank-vehicle, it is recommended that precautions are taken to ensure the safe dissipation of the charge.

Typical precautions being:
• Electrical continuity between metal-to-metal connections to be 10 Ω or less.

• Non-metallic conductive components are installed such that electrical continuity of 10 Ω 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, the electrical continuity across the components does not exceed 10 Ω.

• the electrical continuity between the tank-vehicle shell and the chassis to be 10 Ω or less.

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• The tank shell to be mounted such that there is electrical continuity of 1 000 Ω or less between the

tank shell and wheel rims and 10 Ω or less between the tank shell and a conductive road surface.

• Spray deflectors or other methods may be used to minimize spraying and jetting of liquid from the

footvalves during the loading process.

NOTE The design of a footvalve bonnet or poppet might not provide a reliable means of determining whether,

as installed, the jetting or spraying of product during loading will occur since it can also be dependent on the

installation of the footvalve to its mounting flange and the flange to the tank.
5.3.2 Tank-vehicles suitable for high-speed loading

IEC/TS 60079-32-1:2013, 7.3.2.3.5.4, Table 11 specifies the requirements for a tank-vehicle to be

classified as suitable for high-speed loading (this table is shown in Annex G).
5.3.3 Earthing

It is recommended that the tank-vehicle is fitted with an easily identifiable earth fitting to which an

earthing cable, conforming to IEC/TS 60079-32-1, may be connected.
NOTE Reference can be made to ADR clause 6.8.2.1.27.

The earthing connection may be a separate cable (including clamp) or integrated with the overfill

prevention system as described in EN 13922.

In the arctic region where the alternative 2 wire PTC thermistor is used, a separate static earthing cable

is recommended.
5.4 Tank-vehicle loading equipment
5.4.1 Tank contents determination

For safety and operational purposes, it is important that the empty or not-empty condition of each tank-

vehicle compartment and run-off pipework is determined prior to loading.
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