Railway applications - Braking - Brake pipe accelerator

This document is applicable to brake pipe accelerator valves designed to vent the brake pipe of railway vehicles when an emergency brake application is initiated, without taking the type of vehicles and track-gauge into consideration.
This document specifies the requirements for the design, manufacture and testing of brake pipe accelerator valves.

Bahnanwendungen - Bremse - Schnellbremsbeschleuniger

Dieses Dokument gilt für Schnellbremsbeschleuniger zur Entlüftung der Hauptluftleitung von Eisenbahnfahrzeugen bei Auslösen einer Schnellbremsung ohne Berücksichtigung der Fahrzeugart oder Spurweite.
Dieses Dokument legt die Anforderungen für die Konstruktion, die Herstellung und Prüfung von Schnellbremsbeschleunigern fest.

Applications ferroviaires - Freinage - Accélérateur de vidange de conduite

Le présent document s’applique aux valves accélératrices de vidange conçues pour purger la conduite générale de véhicules ferroviaires lors d’un freinage d’urgence, indépendamment du type de véhicules ou de l’écartement de la voie.
Le présent document spécifie les exigences relatives à la conception, à la fabrication et aux essais des valves accélératrices de vidange.

Železniške naprave - Zavore - Pospešilnik praznjenja glavnega zavornega voda

General Information

Status
Published
Public Enquiry End Date
31-Dec-2018
Publication Date
19-Jul-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2020
Due Date
05-Sep-2020
Completion Date
20-Jul-2020

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SLOVENSKI STANDARD
SIST EN 15612:2020
01-oktober-2020
Nadomešča:
SIST EN 15612:2009+A1:2011
Železniške naprave - Zavore - Pospešilnik praznjenja glavnega zavornega voda
Railway applications - Braking - Brake pipe accelerator
Bahnanwendungen - Bremse - Schnellbremsbeschleuniger
Applications ferroviaires - Freinage - Accélérateur de vidange de conduite
Ta slovenski standard je istoveten z: EN 15612:2020
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
SIST EN 15612:2020 en,fr,de

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

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SIST EN 15612:2020
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SIST EN 15612:2020
EN 15612
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2020
EUROPÄISCHE NORM
ICS 45.040 Supersedes EN 15612:2008+A1:2010
English Version
Railway applications - Braking - Brake pipe accelerator

Applications ferroviaires - Freinage - Accélérateur de Bahnanwendungen - Bremse -

vidange de conduite Schnellbremsbeschleuniger
This European Standard was approved by CEN on 13 April 2020.

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, Turkey 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15612:2020 E

worldwide for CEN national Members.
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SIST EN 15612:2020
EN 15612:2020 (E)
Contents Page

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

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

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

4 Design and manufacture ............................................................................................................................... 7

4.1 General ................................................................................................................................................................ 7

4.2 Functional requirements.............................................................................................................................. 7

4.2.1 General ................................................................................................................................................................ 7

4.2.2 Operating requirements ............................................................................................................................... 7

4.2.3 Train behaviour ............................................................................................................................................... 7

4.2.4 Effect of overcharge ........................................................................................................................................ 7

4.2.5 Effect of individual vehicle ........................................................................................................................... 8

4.2.6 Subsequent emergency braking ................................................................................................................ 8

4.2.7 Sensitivity .......................................................................................................................................................... 8

4.2.8 Insensitivity to brake pipe pressure fall ................................................................................................. 8

4.2.9 Insensitivity to distributor valve quick service device operation ................................................ 8

4.2.10 Tightness ............................................................................................................................................................ 9

4.3 Shock and vibration requirements ........................................................................................................ 10

4.4 Environment requirements ...................................................................................................................... 10

4.4.1 General ............................................................................................................................................................. 10

4.4.2 Temperature .................................................................................................................................................. 10

4.4.3 Other environmental conditions ............................................................................................................ 10

4.5 Compressed air quality .............................................................................................................................. 11

4.6 Fire behaviour ............................................................................................................................................... 11

4.7 External appearance ................................................................................................................................... 12

4.8 Design requirements regarding pressure stress .............................................................................. 12

4.9 Interfaces ........................................................................................................................................................ 12

4.9.1 General ............................................................................................................................................................. 12

4.9.2 Mechanical ...................................................................................................................................................... 12

4.9.3 Pneumatic ....................................................................................................................................................... 12

5 Type tests ........................................................................................................................................................ 12

5.1 General ............................................................................................................................................................. 12

5.2 Individual brake pipe accelerator tests ............................................................................................... 12

5.2.1 Test bench for individual brake pipe accelerator tests ................................................................. 12

5.2.2 Sampling for type tests ............................................................................................................................... 14

5.2.3 Test temperature and air quality ........................................................................................................... 14

5.2.4 Procedure for type tests ............................................................................................................................ 14

5.2.5 Operation at extreme temperatures ..................................................................................................... 17

5.3 Simulated train consist tests .................................................................................................................... 18

5.3.1 Simulated train consist test bench ......................................................................................................... 18

5.3.2 Sampling for train consist test ................................................................................................................. 18

5.3.3 Test temperature and air quality ........................................................................................................... 18

5.3.4 Test procedure .............................................................................................................................................. 19

6 In-service assessment................................................................................................................................. 20

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EN 15612:2020 (E)

7 Designation ..................................................................................................................................................... 20

8 Identification and marking ....................................................................................................................... 20

Annex A (normative) In-service assessment ................................................................................................... 21

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2016/797/EU aimed to be covered............................................ 22

Bibliography ................................................................................................................................................................. 24

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SIST EN 15612:2020
EN 15612:2020 (E)
European foreword

This document (EN 15612:2020) has been prepared by Technical Committee CEN/TC 256 “Railway

applications”, 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 December 2020, and conflicting national standards

shall be withdrawn at the latest by December 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 15612:2008+A1:2010.
The main changes compared to EN 15612:2008+A1:2010 are:
a) the standard’s title has been modified;
b) normative references have been updated;
c) terms and definitions have been revised;
d) requirements on design and manufacture have been revised;
e) requirements on materials have been removed;
f) requirements on type tests have been revised;
g) requirements on routine test and inspection have been removed;
h) requirements on documentation have been removed;
i) requirements on identification and marking have been revised;
j) Annex ZA has been updated.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive 2016/797/EU.

For relationship with EU Directive 2016/797/EU, see informative Annex ZA, which is an integral part of

this document.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
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SIST EN 15612:2020
EN 15612:2020 (E)
1 Scope

This document is applicable to brake pipe accelerators designed to vent the brake pipe of railway

vehicles when an emergency braking is initiated, without taking the type of vehicles and track-gauge

into consideration.

This document specifies the requirements for the design, manufacture and testing of brake pipe

accelerators.
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 14478:2017, Railway applications – Braking – Generic vocabulary

EN 14601:2005+A1:2010, Railway applications – Straight and angled end cocks for brake pipe and main

reservoir pipe

EN 15355:2019, Railway applications – Braking – Distributor valves and distributor-isolating devices

EN 45545-2:2013+A1:2015, Railway applications – Fire protection on railway vehicles – Part 2:

Requirements for fire behaviour of materials and components

EN 50125-1:2014, Railway applications – Environmental conditions for equipment – Part 1: Rolling stock

and on-board equipment

EN 60721-3-5:1997, Classification of environmental conditions – Part 3: Classification of groups of

environmental parameters and their severities – Section 5: Ground vehicle installations

(IEC 60721-3-5:1997)

EN 61373:2010, Railway applications – Rolling stock equipment – Shock and vibration tests

(IEC 61373:2010)

EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads – Part 1:

Dimensions, tolerances and designation (ISO 228-1:2000)
ISO 8573-1:2010, Compressed air – Part 1: Contaminants and purity classes
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SIST EN 15612:2020
EN 15612:2020 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 14478:2017 and the following

apply.

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

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1
brake pipe accelerator

component connected to the brake pipe that, in response to a brake command, assists the propagation

of the brake command throughout the train by locally venting the brake pipe (see Figure 1)

Key
1 input pressure (brake pipe)
2 brake pipe accelerator
3 exhaust
Figure 1 — Brake pipe accelerator, main function and block diagram

[SOURCE: EN 14478:2017, 4.10.3.7, modified – Note 1 to entry has been deleted; “(see Figure 1)” has

been added at the end of the definition; Figure and key have been added to the definition.]

3.2
normal litre

unit of amount of a gas equal to the amount of 1 l at a pressure of 1,0 bar and at a standard temperature,

at 20 °C
Note 1 to entry: Airflow is often stated in normal litres per minute (NI/min).
3.3
quick service function

function of a distributor valve which allows, when applying the brake both from stand-by and released

position, the local fast venting of brake pipe pressure by a certain specified amount and at a certain

specified gradient, to provide pneumatic brake signal transmission through a train

3.4
quick service device
device that fulfils the quick service function
3.5
emergency braking

brake pipe pressure fall at the accelerator valve as a result of a demand for an emergency braking from

any source
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EN 15612:2020 (E)
3.6
overcharge
increase in brake pipe pressure above normal working pressure
4 Design and manufacture
4.1 General

The design and manufacture of the brake pipe accelerators shall comply with this document.

4.2 Functional requirements
4.2.1 General

Brake pipe accelerators shall be able to operate with all distributors valves that conform with

EN 15355:2019 and all existing brake pipe accelerators that comply with the requirements of this

document.

The brake pipe accelerator shall be ready to operate when the brake pipe has reached the normal

working pressure. The brake pipe accelerator shall operate in response to a defined rapid fall of brake

pipe pressure to ensure a continuing rapid fall to below 2,5 bar.
4.2.2 Operating requirements

The following operating requirements are defined in relation to the normal working pressure of

(5,00 ± 0,05) bar. When an emergency braking occurs, the brake pipe accelerators shall create a

sufficiently rapid reduction in brake pipe pressure to ensure the rapid increase in brake cylinder

pressure on every vehicle in the train set. When the pressure in the brake pipe has fallen quickly to

below 2,5 bar, and within no more than 4 s after the brake pipe accelerator commences operation, the

brake pipe accelerator shall stop venting air so that the brake pipe can rapidly be refilled. This

requirement shall be proven by testing in accordance with 5.2.4.4.

No functional errors shall occur in the operation of the brake pipe accelerator at input pressures of

(5,00 ± 1,00) bar. This requirement shall be proven by testing in accordance with 5.2.4.10.

4.2.3 Train behaviour

The brake pipe accelerator shall exhaust the air from the brake pipe without causing any adverse effect

on train behaviour. This requirement shall be proven by testing in accordance with 5.3.

4.2.4 Effect of overcharge
4.2.4.1 Overcharge after full service braking

The brake pipe accelerator shall not come into operation due to the effect of a normal working pressure

overcharge after a full service braking, which allows a build-up of brake pipe pressure above normal

working pressure to 6,00 bar. It shall be taken into account that this overcharge can be present for up to

40 s in brake mode “G” and 10 s in brake mode “P” after a full service braking. This requirement shall be

proven by testing in accordance with 5.2.4.8.
4.2.4.2 Overcharge starting from normal working pressure

The brake pipe accelerator shall not come into operation if the brake pipe pressure, starting from the

normal working pressure, is raised to 6,0 bar for 2 s, then is reduced to 5,2 bar in 1 s, followed by a

return to the normal working pressure at a rate of 0,15 bar in 60 s. This requirement shall be proven by

testing in accordance with 5.2.4.9.
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EN 15612:2020 (E)
4.2.5 Effect of individual vehicle

The operation of the brake pipe accelerator shall not be affected by an individual vehicle with a brake

pipe volume not exceeding 25 l, where a brake pipe accelerator is not fitted or the brake has been

isolated. This shall apply irrespective of the position of that vehicle in the train consist. This

requirement shall be proven by testing in accordance with 5.3.
4.2.6 Subsequent emergency braking

The brake pipe accelerator shall come into operation when an emergency braking is applied after a full

service braking. This requirement shall be proven by testing in accordance with 5.2.4.7.

4.2.7 Sensitivity

The brake pipe accelerator shall come into operation as response to a drop in brake pipe pressure with

a gradient of 1,80 bar in (3,0 + 0,1) s starting from input pressure of (5,00 ± 0,05) bar with a maximum

delay of 2 s.
This requirement shall be proven by testing in accordance with 5.2.4.4.
4.2.8 Insensitivity to brake pipe pressure fall

The brake pipe accelerator shall not come into operation as response to a drop in brake pipe pressure

with a gradient of 1,80 bar in (6,0 + 0,3) s starting from input pressure of (5,00 ± 0,05) bar. Continuing

the pressure fall down to 2,5 bar shall not cause the brake pipe accelerator to operate. This requirement

shall be proven by testing in accordance with 5.2.4.5.
4.2.9 Insensitivity to distributor valve quick service device operation

The brake pipe accelerator shall not operate during the initial stage of service braking due to operation

of the distributor valve internal quick service device. The initial stage of service braking is characterized

by a drop of the brake pipe pressure starting at (5,00 ± 0,05) bar by (0,50 ± 0,05) bar within 1,0 s, with

the initial rate of 2,0 bar/s during the first pressure drop of (0,30 ± 0,05) bar as shown in Figure 2.

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EN 15612:2020 (E)
Key
P pressure, expressed in bar
t time, expressed in s
Figure 2 — Brake pipe pressure fall for insensitivity test
This requirement shall be proven by testing in accordance with 5.2.4.6.
4.2.10 Tightness

Tightness of the brake pipe accelerator shall be such that technical performance as specified by this

document is met without restrictions.

The sealing arrangement within the brake pipe accelerator shall prevent loss of air as follows when

considering a brake pipe pressure of 6,0 bar:

— At an environmental temperature of (20 ± 5) °C, the brake pipe accelerator shall not have a leakage

rate of greater than 0,005 Nl/min. This requirement shall be proven by testing in accordance with

5.2.4.3;

— At –25 °C ≤ environmental temperature < 15 °C, also at 25 °C < environmental temperature ≤ 70 °C,

the brake pipe accelerator shall not have a leakage rate of greater than 0,01 Nl/min. This

requirement shall be proven by testing in accordance with 5.2.5;

— At –40 °C ≤ environmental temperature < –25 °C, the brake pipe accelerator shall not have a

leakage rate of greater than 0,1 Nl/min. This requirement shall be proven by testing in accordance

with 5.2.5.
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EN 15612:2020 (E)
4.3 Shock and vibration requirements

The brake pipe accelerator shall be able to operate without restriction under shock and vibration

conditions as specified by EN 61373:2010. The class and category of test severity shall be declared by

design documentation.
These requirements shall be tested in accordance with 5.2.4.11.
4.4 Environment requirements
4.4.1 General

All the environmental requirements listed shall be taken into account within the design concept of the

components. However, only the assessment tests listed in Clause 5 shall be performed. The remaining

proofs shall be presented in the declarations of conformity.
4.4.2 Temperature

Brake pipe accelerators covered by this document shall be able to operate at –40 °C ≤ environmental

temperature ≤ +70 °C without any deviation from the technical requirements specified in Clause 4 of

this document, except the case defined below.

At –40 °C ≤ environmental temperature < –25 °C the brake pipe accelerator shall come into operation as

response to a drop in brake pipe pressure with a gradient of 1,8 bar in (3,0 + 0,1) s starting from input

pressure with no time limit for the delay, defined in 4.2.7.
This requirement shall be proven by testing in accordance with 5.2.5.
4.4.3 Other environmental conditions
4.4.3.1 Altitude

The brake pipe accelerator shall be able to operate without restrictions up to altitude of 2 000 m.

4.4.3.2 Humidity
The following external humidity levels shall be considered:
— yearly average: ≤ 75 % relative humidity;
— on 30 days in the year continuously: between 75 % and 95 % relative humidity;
— on the other days occasionally: between 95 % and 100 % relative humidity;
— maximum absolute humidity: 30 g/m occurring in tunnels.

An operationally caused infrequent and slight moisture condensation shall not lead to any malfunction

or failure.

The psychometric charts contained in EN 50125-1:2014 shall be used to establish the range of variation

of the relative humidity for the different temperature classes that it is considered will not be exceeded

for more than 30 days per year.

At cooled surfaces, 100 % relative humidity can occur causing condensation on parts of equipment; this

shall not lead to any malfunction or failure.

Sudden changes of the air temperature with a rate of 3K/s and maximum variation of 40 K local to the

vehicle can cause condensation of water on parts of the equipment. These conditions particularly

occurring when entering or leaving a tunnel shall not lead to any malfunction or failure of the

equipment.
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EN 15612:2020 (E)
4.4.3.3 Rain

Rain rate of 6 mm/min shall be taken into account. The effect of rain shall be considered depending on

the possible equipment installation together with wind and vehicle movement.
4.4.3.4 Snow, ice and hail

Consideration shall be given to the effect of all kinds of snow, ice and/or hail. The maximum diameter of

hailstones shall be taken as 15 mm, larger diameters can occur exceptionally. The effect of snow, ice and

hail shall be considered depending on the equipment installation together with wind and vehicle

movement.
4.4.3.5 Solar radiation

Equipment design shall allow for direct exposure to solar radiation at the rate of 1 120 W/m for a

maximum duration of 8 h.
4.4.3.6 Pollution

The effects of pollution shall be considered in the design of equipment and components. Means may be

provided to reduce pollution by the effective use of protection of the brake pipe accelerator. The

severity of pollution can depend upon the location of the equipment on the vehicle, therefore the effects

of the kinds of pollution indicated in Table 1 shall be considered as a minimum.
Table 1 — Pollution
Pollution Class to be considered
Chemically active substances Class 5C2 of EN 60721-3–5:1997
Class 5F2 (electrical engine) of EN 60721-3–5:1997
Contaminating fluids
Class 5F3 (thermal engine) of EN 60721-3–5:1997
Biologically active substances Class 5B2 of EN 60721-3–5:1997
Dust Class 5S2 of EN 60721-3–5:1997
Stones and other objects Objects of maximum 15 mm diameter and ballast
Sand Class 5S2 of EN 60721-3–5:1997
Sea spray Class 5C2 of EN 60721-3–5:1997
4.5 Compressed air quality

It shall be possible to operate the brake pipe accelerator without restrictions with at least the

compressed air quality according to the following classes defined by ISO 8573-1:2010:

— class 3 – for the maximum particle size and the maximum concentration of solid contaminants;

— class 4 – for the water dew point;

— class 4 – for the maximum total (droplets, aerosols and vapours) oil concentration.

4.6 Fire behaviour

The fire behaviour of the brake pipe accelerator shall correspond to the requirements of EN 45545-2:

2013+A1:2015.
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EN 15612:2020 (E)
4.7 External appearance

The dimensions and the coordinates and threads of the ports and fixing points of the brake pipe

accelerator shall comply with the details given by the relevant drawings.

The design of the brake pipe accelerator shall ensure that the exterior surfaces of the brake pipe

accelerator are free of sharp edges and corners that could be dangerous to those people handling the

brake pipe accelerator or, when installed on a vehicle, working on adjacent equipment.

This requirement shall be checked in accordance with 5.2.4.2.
4.8 Design requirements regarding pressure stress

The design of the brake pipe accelerator shall allow safe required performance with a maximum supply

pressure of 10 bar. It shall be taken into consideration that the maximum supply pressure can be

reached in other pneumatic circuits of the brake pipe accelerator.
4.9 Interfaces
4.9.1 General

A brake pipe accelerator shall be capable of being installed on the vehicle in accordance with 4.9.2 and

4.9.3 or directly mounted to a distributor valve.
4.9.2 Mechanical

The connection of the brake pipe accelerator to the vehicle shall be via a mounting bracket or manifold.

The interface shall be suitably sized to meet the physical loadings identified in this document. The

interface of the brake pipe accelerator depends on the individual design of the brake pipe accelerator`s

design.
4.9.3 Pneumatic

The pneumatic interface with the vehicle pipework shall be via a suitable manifold/pipe connection

such that removal of the brake pipe accelerator without disturbing the main brake pipe is possible. The

pipe connections to the brake pipe shall be via a threaded connection of size G 1 or G 1 1/4 in

accordance with EN ISO 228-1:2003.
5 Type tests
5.1 General
The following type tests shall be carried out:
a) individual brake pipe accelerator tests (see 5.2);
b) simulated train consist tests (see 5.3).
All the test requirements shall be achieved to obtain type test compliance.

The accuracy of the measuring devices shall be declared in the test report and the measurement

uncertainty shall be taken into account by the assessment.
5.2 Individual brake pipe accelerator tests
5.2.1 Test bench for individual brak
...

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