Regulation No. 59-00

Name:Regulation No. 59-00
Description:Replacement Silencing Systems.
Official Title:Uniform Provisions Concerning the Approval of: Replacement Silencing Systems.
Country:ECE - United Nations
Date of Issue:1983-01-18
Amendment Level:00 Series, Supplement 3
Number of Pages:19
Vehicle Types:Car, Component, Light Truck
Subject Categories:Prior Versions
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Keywords:

system, approval, silencing, type, regulation, vehicle, paragraph, components, test, exhaust, engine, replacement, number, annex, component, production, speed, tests, manufacturer, pressure, maximum, conformity, means, mark, pursuant, conditions, granted, noise, measured, systems, requirements, submitted, technical, original, exceed, fitted, level, power, mounted, ensure, approved, service, apparatus, tested, date, vehicles, agreement, form, results, provisions

Text Extract:

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E/ECE/324 )
E/ECE/TRANS/505 ) Rev.1/Add.58/Amend.3
November 10, 2006
STATUS OF UNITED NATIONS REGULATION
ECE 59
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

REGULATION NO. 59
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 Definitely Discontinues
12. Names and Addresses of Technical Services Responsible for Conducting Approval Tests,
and of Administrative Departments
ANNEXES
Annex 1 −
Annex 2
Annex 3
Annex 4
Annex 5
Communication Concerning the Approval (or Refusal or Withdrawal of Approval or
Production Definitely Discontinued) of a Type of Replacement Silencing System or
Components of the Said System Pursuant to Regulation No. 59.
− Arrangement of the Approval Mark
− Test Apparatus
− Measuring Points - Back Pressure.
− Checks on Conformity of Production

2.6.3. the type of engine (positive ignition, compression ignition, two stroke or four stroke,
reciprocating or rotary), number and capacity of cylinders, number of carburettors,
arrangement of valves, maximum horse-power and corresponding engine speed (rpm), etc.
2.6.4. number and ratios of gears, total ratio of the transmission,
2.6.5. the number, type and arrangement of the exhaust system, and
2.6.6. the number, type and arrangement of the intake systems.
3. APPLICATION FOR APPROVAL
3.1. The application for approval of a replacement silencing system or components of said
system shall be submitted by its manufacturer or by his duly accredited representative.
3.2. It shall be accompanied by the undermentioned documents in triplicate and the following
particulars:
3.2.1. a description of the vehicle type(s) on which the system or components is intended to be
mounted, with regard to the items mentioned in Paragraph 2.6 above. The numbers and/or
symbols identifying the engine type and the vehicle type shall be specified and the vehicle
type approval number, if necessary;
3.2.2. a description of the assembled silencing system showing the relative position of each of its
components, as well as mounting instructions;
3.2.3. detailed drawings of each component to enable it to be easily located and identified, and a
specification of the material used.
3.3. On request of the technical service conducting the tests for approval, the manufacturer of
the silencing system shall submit;
3.3.1. two samples of the system or components submitted for approval;
3.3.2. a sample of the original silencing system with which the vehicle was equipped when
submitted for type approval;
3.3.3. a vehicle representative of the type of which the system is to be fitted; this vehicle, when
measured for noise emission according to the methods described in Paragraph 3.1. and 3.2.
of Annex 3 to Regulation No. 51 must satisfy the following conditions:
3.3.3.1. the noise level when the vehicle is in motion must not exceed the limit applicable to the
category of vehicle concerned at the time when the type to which the vehicle belongs was
approved; furthermore, it must not exceed by more than 3 dB(A) the noise level indicated in
the approval of the type of which the vehicle belongs;
3.3.3.2. the noise level when the vehicle is stationary must not exceed by more than 3 dB(A) the
reference value indicated in the approval of the type to which the vehicle belongs;
3.3.4. A separate engine, of at least the same cylinder capacity and power as that of the
above-mentioned 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. SPECIFICATIONS
6.1. General Specifications
6.1.1. The replacement exhaust system or components thereof must be designed, constructed and
capable of being mounted so as to ensure that the vehicle complies with the provisions of
this Regulation under normal conditions of use, notwithstanding any vibrations to which it
may be subject.
6.1.2. The silencing system or components thereof must be designed, constructed and capable of
being mounted so that reasonable resistance to the corrosion phenomenon to which it is
exposed is obtained having regard to the conditions of use of the vehicle.
6.2. Specifications Regarding Noise Levels
6.2.1. The acoustic efficiency of the replacement silencing system or components of said system
shall be certified by means of the methods described in Paragraph 3.1. and 3.2. of Annex 3
to Regulation No. 51.
When the replacement silencing system or components thereof is mounted on the vehicle
described in Paragraph 3.3.3. above, the noise levels obtained using the two methods
(stationary and running vehicle) shall satisfy one of the following conditions:
6.2.1.1. they shall not exceed the values obtained with the type of vehicle concerned when submitted
for approval,
6.2.1.2. they shall not exceed the noise values measured on the vehicle referred to in
Paragraph 6.2.1. above, when this is fitted with an exhaust silencing system corresponding
to the type fitted to the vehicle when submitted for type approval.
6.3. Measurement of the Vehicle Performances
6.3.1. The replacement exhaust system or components thereof must be such as to ensure that
vehicle performance is comparable with that achieved with the original equipment system or
component thereof.
6.3.2. The replacement silencing system or, depending on the manufacturer's choice, the
components of said system shall be compared with an original silencing system or
components, which are also in new condition, successively mounted on the vehicle
mentioned in Paragraph 3.3.3. above.
6.3.3. The verification shall be carried out by measuring the back pressure pursuant to
Paragraph 6.3.4. below.
The value measured with the replacement silencing system shall not exceed the value
measured with the original standard silencing system by more than 25% under the
conditions mentioned below.

6.4.2. Conditioning on a Test Bench
6.4.2.1. Using standard parts and observing the vehicle manufacturer's instructions, the silencer
must be fitted to the engine, which is coupled to a dynamometer.
6.4.2.2. The test must 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.
6.4.2.3. During each six-hour period, the engine shall be run under the following conditions in turn:
(1) five minutes at idling speed;
(2) one-hour Sequence under 1/4 load at 3/4 of rated maximum speed (S);
(3) one-hour Sequence under 1/2 load at 3/4 of rated maximum speed (S);
(4) 10-minute sequence under full load at 3/4 of rated maximum speed (S);
(5) 15-minute sequence under 1/2 load at rated maximum speed (S);
(6) 30-minute sequence under 1/4 load at rated maximum speed (S);
Total duration of the six sequences: three hours.
Each period must comprise two sets of the six above-mentioned sequences.
6.4.2.4. During the test, the silencer must not be cooled by a forced draught simulating normal
airflow around the vehicle. Nevertheless, at the request of the manufacturer, the silencer
may be cooled in order not to exceed the temperature recorded at its inlet when the vehicle
is running at maximum speed.
6.4.3. Conditioning by Pulsation
The exhaust system or components of said system is/are fitted to the vehicle referred to in
Paragraph 3.3.3. above or the engine referred to in Paragraph 3.3.4. In the former case, the
vehicle must be mounted on a roller dynamometer, and, in the second case, the engine
must be mounted on a dynamometer.
The test apparatus described below is fitted at the outlet of the silencing system.
6.4.3.1. Test Apparatus
The test apparatus, a detailed diagram of which is shown in Annex 3 to this Regulation must
be fitted at the outlet of the exhaust system. Any other apparatus providing equivalent
results is acceptable.

9. CONFORMITY OF PRODUCTION
9.1. Every replacement silencing system or component thereof 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.
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 administrative service;
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;
9.3.5. ensure that for each type product at least the tests prescribed in Annex 5, point 2, are
carried out;
9.3.6. ensure that sampling or test pieces giving evidence of non-conformity with the type of test
considered shall give rise to another sampling and another test. All the necessary steps
shall be taken to re-establish the conformity of the corresponding production.
9.4. The competent authority which has granted type-approval may at any time verify the
conformity control method applicable to each production unit.
9.4.1. At every inspection, the test books and production survey records shall be presented to the
visiting inspector.
9.4.2. The inspector may take samples at random which will be tested in the manufacturer's
laboratory. The minimum number of samples may be determined according to the results of
the manufacturer's own verification.
9.4.3. When the quality level appears unsatisfactory or when it seems necessary to verify the
validity of the tests carried out in application of Paragraph 9.4.2. above, the inspector shall
select samples to be sent to the technical service which has conducted the type approval
tests.
9.4.4. The competent authority may carry out any test prescribed in this Regulation.
9.4.5. The normal frequency of inspections by the competent authority shall be one every two
years. If unsatisfactory results are recorded during one of these visits, the competent
authority shall ensure that all necessary steps are taken to re-establish the conformity of
production as rapidly as possible.

ANNEX 1
(Maximum format: A4 (210 x 297 mm))
Name of administration
Communication Concerning the Approval (or Refusal
or Withdrawal of Approval or Production Definitely
Discontinued) of a Type of Replacement Silencing
System or Components of the Said System Pursuant
to Regulation No. 59
Approval No ...................................................................................................................................................
1. Trade name or mark of the silencing system ............................................................................
2. Type of the silencing system......................................................................................................
3. Manufacturer's name and address ............................................................................................
...................................................................................................................................................
4. If applicable, name and address of manufacturer's representative. ..........................................
...................................................................................................................................................
5. Brief description of the silencing (with/without fibrous material, etc) .....................................
...................................................................................................................................................
6. Trade name or mark of the vehicle type for which the silencing system is intended.................
...................................................................................................................................................
7. Vehicle type, starting from serial number: .................................................................................
(1)

27. Signature....................................................................................................................................
28. The following documents, bearing the approval number shown above, are annexed to this
communications:
............................................................. 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 litres
4.
Pressure switch 0.05 to 2.5 bar - to close 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 4 bar. The
response time, both when opening and closing, must not exceed 0.5 second
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,
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 above. The exhaust system or component under test shall be
subjected to the test as described in Paragraphs 6.2., 6.3. and 6.4. above.
3. SAMPLING
An exhaust system or component has to be chosen. If after the test of Paragraph 4.1. the
sample is not considered to conform to the requirements of this Regulation two more
samples have to be tested.
4. EVALUATION OF THE RESULTS
4.1. If the sound levels of the exhaust system or component tested pursuant to Paragraphs 1 and 2,
measured in accordance with Paragraph 6.2. above, do no exceed by more than 1 dB(A) the
level measured during the type-approval tests of this type of exhaust system or component,
the exhaust system or component type shall be considered to conform to the requirements of
this Regulation.
4.2. If the exhaust system or component tested according to Paragraph 4.1. does not satisfy the
requirements laid down in that Paragraph, two more exhaust systems or components of the
same type must be tested pursuant to Paragraphs 1 and 2 above.
4.3. If the sound level of the second and/or third sample of Paragraph 4.2. exceeds by more than
1 dB(A) the level measured during the type-approval tests of this type of exhaust system or
component, the exhaust system or component type 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.