Regulation No. 59-01

Name:Regulation No. 59-01
Description:Replacement Silencing Systems.
Official Title:Uniform Provisions Concerning the Approval of: Replacement Silencing Systems.
Country:ECE - United Nations
Date of Issue:2012-11-14
Amendment Level:01 Series
Number of Pages:21
Vehicle Types:Car, Component, Light Truck
Subject Categories:Prior Versions
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Keywords:

system, silencing, approval, type, regulation, vehicle, paragraph, components, test, replacement, engine, production, number, systems, conformity, component, exhaust, annex, speed, tests, noise, thereof, requirements, maximum, manufacturer, pressure, conditions, means, granted, results, measured, mounted, authority, force, fitted, amendments, date, technical, mark, submitted, power, pursuant, referred, agreement, series, ece, ensure, rated, gas, entry

Text Extract:

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E/ECE/324
) Rev.1/Add.58/Rev.1
E/ECE/TRANS/505 )
November 14, 2012
STATUS OF UNITED NATIONS REGULATION
ECE 59-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
REPLACEMENT SILENCING SYSTEMS
Incorporating:
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 28.01.90
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 25.12.94
Supplement 3 to the 00 series of amendments
Date of Entry into Force: 10.10.06
01 series of amendments
Date of Entry into Force: 13.04.12

REGULATION NO. 59-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF
REPLACEMENT SILENCING SYSTEMS
CONTENTS
REGULATION
1. Scope
2. Definitions
3. Application for Approval
4. Markings
5. Approval
6. Specifications
7. Extension of Approval
8. Modification of the Type of Silencing System
9. Conformity of Production
10. Penalties for Non-conformity of Production
11. Production Definitively Discontinued
12. Names and Addresses of Technical Services Responsible for Conducting Approval Tests,
and of Type Approval Authorities
ANNEXES
Annex 1 −
Annex 2
Annex 3
Annex 4
Annex 5
Communication
− Arrangements of Approval Marks
− Test Apparatus
− Measuring Points - Back Pressure.
− Checks on Conformity of Production

2.5. "Design family of replacement silencing systems or replacement systems
components" means silencing systems or components thereof belonging to the same
design family if all of the following characteristics are the same:
(a)
(b)
(c)
(d)
The exhaust gases in contact with the absorbing fibrous material do not have gas flow
through this material: (yes or no);
The type of the fibres (e.g. basalt wool, biosil wool, glass wool, E-type wool, etc.);
Binder material specifications (if applicable);
Average fibre dimensions (thickness, length);
(e) Minimum bulk material packing density (kg/m );
(f)
Maximum contact surface between the gas flow and the absorbing material
(e.g. perforation open area).
2.6. "Approval of a Replacement Silencing System or Components of Said System" means
the approval of the whole or part of a silencing system adaptable to one or several specified
types of motor vehicles, as regards the limitation of their noise level;
2.7. "Vehicle Type" means a category of motor vehicles which do not differ significantly in such
respects as:
2.7.1. The lines and constituent materials of the body (more particularly the engine compartment
and its soundproofing),
2.7.2. The length and width of the vehicle,
2.7.3. The type of engine (positive ignition, compression ignition, two stroke or four stroke,
reciprocating or rotary, hybrid-electric engine type), number and capacity of cylinders,
number of carburettors or injection system, arrangement of valves, rated maximum power
and corresponding engine speed (rpm) or the type of the electric motor;
2.7.4. Number and ratios of gears, total ratio of the transmission,
2.7.5. The number, type and arrangement of the exhaust systems;
2.7.6. The number, type and arrangement of the intake systems.

5. APPROVAL
5.1. If the type of replacement silencing system submitted for approval pursuant to this
Regulation meets the requirement of Paragraph 6 below, approval for that type shall be
granted.
5.2. An approval number shall be assigned to each type approved. Its first two digits (at
present 01 corresponding to the 01 series of amendments to the Regulation) shall indicate
the series of amendments incorporating the most recent major technical amendments made
to the Regulation at the time of issue of the approval. The same Contracting Party may not
assign the same number to another type of replacement silencing system or component
designed for the same type(s) of vehicle.
5.3. Notice of approval or of refusal of approval of a replacement silencing system or
components of said system pursuant to this Regulation shall be communicated to the
Parties to the Agreement which apply this Regulation, by means of a form conforming to the
model in Annex 1 to the Regulation, and of drawings of the silencing system or components
supplied by the applicant for approval, in a format not exceeding A4 (210 × 297 mm) or
folded to that format and on an appropriate scale.
5.4. There shall be affixed to every component of silencing system conforming to a type
approved under this Regulation an international approval mark consisting of:
5.4.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval;
5.4.2. The number of this Regulation, followed by the Letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 5.4.1;
5.4.3. The approval number shall be mentioned in the approval form, as well as the method used
for approval tests.
5.5. The approval mark shall be easily legible and indelible, when the silencing system is
mounted on the vehicle.
5.6. A component may be marked with more than one approval number if it has been approved
as a part of more than one replacement silencing system; in this case the circle need not be
repeated. Annex 2 to this Regulation gives an example of the arrangement of the approval
mark.

6.2.2. The noise reduction performance of the replacement silencing system or components of
said system shall be verified by means of the methods described in Paragraphs 6.2.1.,
6.2.2. and 6.2.3. of Regulation No. 51. In particular, for the application of this Paragraph,
reference shall be made to the amendment level of Regulation No. 51 which was in force at
the time of type approval of the new vehicle.
(a)
Measurement with running vehicle
When the replacement silencing system or components thereof is mounted on the
vehicle described in Paragraph 3.3.3. above, the noise levels obtained shall satisfy
one of the following conditions:
(i)
(ii)
The value measured (rounded to the nearest integer) shall not exceed by more
than 1 dB(A) the type approval value obtained under Regulation No. 51 with
the type of vehicle concerned.
The value measured (before any rounding to the nearest integer) shall not
exceed by more than 1 dB(A) the noise value measured (before any rounding
to the nearest integer) on the vehicle referred to in Paragraph 3.3.3. above,
when this is fitted with a silencing system corresponding to the type fitted to the
vehicle when submitted for type approval under Regulation No. 51.
Where back-to-back comparison of the replacement system with the original
system is chosen, for the application of Paragraph 3.1.2.1.4.2. and/or
Paragraph 3.1.2.2.1.2. of Annex 3 of Regulation No. 51, it is allowed to have a
gear change to higher accelerations and the use of electronic or mechanical
devices to prevent this downshift is not mandatory. If under these conditions
the noise level of the test vehicle becomes higher than the conformity of
production (COP) values, the Technical Service will decide on the
representativeness of the test vehicle.
(b)
Measurement with stationary vehicle
When the replacement silencing system or components thereof is mounted on the
vehicle described in Paragraph 3.3.3. above, the noise levels obtained shall satisfy
one of the following conditions:
(i)
(ii)
The value measured (rounded to the nearest integer) shall not exceed by more
than 2 dB(A) the type approval value obtained under Regulation No. 51 with
the type of vehicle concerned.
The value measured (before any rounding to the nearest integer) shall not
exceed by more than 2 dB(A) the noise value measured (before any rounding
to the nearest integer) on the vehicle referred to in Paragraph 3.3.3. above,
when this is fitted with a silencing system corresponding to the type fitted to the
vehicle when submitted for type approval under Regulation No. 51.

6.4. Additional specifications regarding replacement silencing systems or components containing
acoustically absorbing fibrous materials
6.4.1. General
Sound absorbing fibrous materials may be used in silencing systems or components thereof
only if:
(a)
(b)
The exhaust gas is not in contact with the fibrous materials; or if
The silencing system or the components thereof are of the same design family as
systems or components for which it has been proven, in the course of the type
approval process in accordance with the requirements of this Regulation, that they
are not subject to deterioration.
Unless one of these conditions is fulfilled, the complete silencing system or component
thereof shall be submitted to conventional conditioning using one of the three installations
and procedures described below.
6.4.1.1. Continuous Road Operation for 10,000 km
6.4.1.1.1. 50 ± 20% of this operation shall consist of urban driving and the remaining operation shall
be long-distance runs at high speed; continuous road operation may be replaced by a
corresponding test-track programme.
The two speed regimes shall be alternated at least twice.
The complete test program shall include a minimum of 10 breaks of at least three-hour
duration in order to reproduce the effects of cooling and any condensation which may occur.
6.4.1.2. Conditioning on a Test Bench
6.4.1.2.1. Using standard parts and observing the vehicle manufacturer's instructions, the silencing
system or components thereof shall be fitted to the vehicle referred to in Paragraph 3.3. of
this Regulation or the engine referred to in Paragraph 3.4. of this Regulation. In the former
case the vehicle shall be mounted on a roller dynamometer. In the second case, the engine
shall be coupled to a dynamometer.
6.4.1.2.2. The test shall be conducted in six six-hour periods with a break of at least 12 hours between
each period in order to reproduce the effects of cooling and any condensation which may
occur.

6.4.1.3.9. The entire test shall be completed within 48 hours. If necessary, one cooling period will be
observed after each hour.
6.4.1.3.10. After conditioning, the noise level is checked pursuant to Paragraph 6.2. above.
7. EXTENSION OF APPROVAL
The silencing system manufacturer or his duly accredited representative may ask the Type
Approval Authority which has granted the approval of the silencing system for one or several
types of vehicles, for an extension of the approval to other types of vehicles.
The procedure is that described in Paragraph 3 above. Notice of the extension of approval
(or refusal of extension) shall be communicated to the Parties to the Agreement which apply
this Regulation in accordance with the procedure specified in Paragraph 5.3. above.
8. MODIFICATION OF THE TYPE OF SILENCING SYSTEM
8.1. Every modification of the type of replacement silencing system shall be notified to the Type
Approval Authority which approved the type of silencing system. The said Authority may
then either:
8.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect, or
8.1.2. Require a further test report from the Technical Service responsible for conducting the tests.
8.2. Confirmation or refusal of approval, specifying the alterations shall be communicated by the
procedure specified in Paragraph 5.3. above to the Parties to the Agreement applying this
Regulation.
9. CONFORMITY OF PRODUCTION
The conformity of production procedures shall comply with those set out in the Agreement,
Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2), with the following requirements:
9.1. Every replacement silencing system bearing an approval mark as prescribed under this
Regulation shall conform to the type of silencing system approved and satisfy the
requirements of Paragraph 6 above. For conformity of production purposes, the limit values
set forth in Paragraph 6. above apply with an additional margin of 1 dB(A).
9.2. In order to verify conformity as prescribed in Paragraph 9.1 above, adequate monitoring of
the production shall be carried out.
9.3. The holder of the approval shall in particular:
9.3.1. Ensure existence of procedures for the effective control of the quality of products;
9.3.2. Have access to the control equipment necessary for checking the conformity of each
approved type;
9.3.3. Ensure that data of test results are recorded and that annexed documents shall remain
available for a period to be determined in accordance with the Type Approval Authority;
9.3.4. Analyse the results of each type product in order to verify and ensure the stability of the
product characteristics, making allowance for the variation of an industrial production;

12. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR
CONDUCTING APPROVAL TESTS, AND OF TYPE APPROVAL AUTHORITIES
The Parties to the Agreement which apply this Regulation shall communicate to the United
Nations Secretariat the names and addresses of the Technical Services responsible for
conducting approval tests and of the Type Approval Authorities which grant approval and to
which forms certifying approval or refusal or withdrawal of approval, issued in other
countries, are to be sent.

13. Gears used: ...............................................................................................................................
14. Final drive ratio(s): ....................................................................................................................
15. Maximum power: .......................................................................................................................
16. Load conditions of vehicle during test: ......................................................................................
17. Sound levels:
17.1. Vehicle in motion: ........................ dB(A) at steady speed before acceleration of ............. km/h
17.2. Vehicle stationary: ....................... dB(A) with engine running at ..................................... min
18. Value of the back pressure: ......................................................................................................
19. Silencing system submitted:
For approval on: ........................................................................................................................
For extension of approval on: ...................................................................................................
20. Technical Service responsible for conducting approval tests: ..................................................
21. Date of report issued by that service: .......................................................................................
22. Number of report issued by that service: ..................................................................................
23. Approval granted/refused : .....................................................................................................
25. Place: ........................................................................................................................................
26. Date: ..........................................................................................................................................
27. Signature: ..................................................................................................................................
28. The following documents, bearing the approval number shown above, are annexed to this
communication:
Drawings, diagrams and plans of the silencing system;
Photographs of the silencing system;
List of components, duly identified constituting the silencing system.

ANNEX 3
TEST APPARATUS
1. Inlet flange or sleeve – connection to the rear of complete silencing system to be
tested.
2. Regulation valve (hand operated).
3. Compensating reservoir from 35 to 40 l.
4. Pressure switch 5 kPa to 250 kPa – to open Item 7.
5. Time delay switch – to close Item 7.
6. Counter of impulses.
7. Quick response valve – such as the valve of an exhaust brake system of 60 mm in
diameter, operated by a pneumatic cylinder with an output of 120 N at 400 kPa. The
response time, both when opening and closing, must not exceed 0.5 s.
8. Exhaust gas evacuation.
9. Flexible pipe.
10. Pressure gauge.

ANNEX 5
CHECKS ON CONFORMITY OF PRODUCTION
1. GENERAL
These requirements are consistent with tests to be held to check conformity of production
(COP), according to Paragraphs 9.3.5. and 9.4.3. of this Regulation.
2. TESTING PROCEDURES
The methods of testing, measuring instruments and interpretation of results shall be those
described in Paragraph 6 of this Regulation. The exhaust system or component under test
shall be subjected to the test as described in Paragraphs 6.2., 6.3. and 6.4. of this
Regulation.
3. SAMPLING AND EVALUATION OF THE RESULTS
One silencing system or component has to be chosen and subjected to the tests of
paragraph 2. above. If the test results fulfil the conformity of production requirements of
paragraph 9.1. of this Regulation, the type of silencing system or component is considered
to be in compliance with COP.
If one of the test results does not fulfil the conformity of production requirements of
paragraph 9.1. of this Regulation, two more silencing systems or components of the same
type shall be tested pursuant to paragraph 2. above.
If the test results for the second and the third silencing system or component fulfil the
conformity of production requirements of paragraph 9.1. of this Regulation, the type of
silencing system or component is considered in compliance with the conformity of
production.
If one of the test results of the second or third silencing system or component does not fulfil
the conformity of production requirements of paragraph 9.1. of this Regulation, the type of
silencing system or component shall be considered not to conform to the requirements of
this Regulation and the manufacturer shall take the necessary measures to re-establish the
conformity.
Replacement Silencing Systems.