Emission standard for ambient noise at boundary of industrial enterprises

Emisson standard for industrial enterprises noise at boundary

(Release draft)

This The electronic version is the release version. Please refer to the official standard published by China Environmental Science Press.

2008-08-19 Issued 2008-10-01 Implemented

Ministry of Environmental Protection

Issued

General Administration of Quality Supervision, Inspection and Quarantine

Preface

In order to carry out the "Chinese People's Republic of China Environmental Protection Act" and "Chinese People's Republic of China Environmental Noise Pollution Prevention and Control Act" to prevent and control the noise pollution of industrial enterprises and improve the sound environment, it is necessary to adopt the following standards. Prevention and Control of Environmental Noise Pollution Law of the People's Republic of China, to prevent and control noise pollution from industrial enterprises and improve the quality of the acoustic environment, the formulation of this standard.

This standard is the first revision of GB 12348-90 "industrial noise standards" and GB 12349-90 "industrial noise measurement methods". Compared with the original standard the main revisions are as follows:

-- The "industrial enterprise plant noise standards" (GB12348-90) and "industrial enterprise plant noise measurement methods" (GB12349-90) into a standard, the name was changed to "industrial enterprise plant boundary environmental noise emission standards";

-- The "industrial enterprise plant noise emission standards". /p>

--Revised the scope of application of the standard, and the revised table of background values;

--Added the noise limit value of Class 0 zone, measurement conditions, location of measurement points, placement of measurement points and measurement records;

This standard was first published in 1990, and this is the first revision.

This standard since the date of implementation to replace the "industrial enterprises plant noise standards" (GB12348-90) and "industrial enterprises plant noise measurement methods" (GB12349-90).

This standard is organized by the Department of Science and Technology Standards of the Ministry of Environmental Protection.

This standard drafting unit: China Environmental Monitoring Terminal, Tianjin Environmental Monitoring Center, Fujian Environmental Monitoring Center.

This standard was approved on July 17, 2008 by the Ministry of Environmental Protection.

This standard from October 1, 2008 shall come into force.

This standard is interpreted by the Ministry of Environmental Protection.

Industrial enterprises plant boundary noise emission standards

1. Scope of application

This standard specifies the limit values of environmental noise emissions from industrial enterprises and fixed equipment plant boundary and its measurement methods.

This standard applies to the management, evaluation and control of noise emissions from industrial enterprises. Institutions, institutions, organizations and other external environmental noise emission units are also implemented in accordance with this standard.

2. Normative references

The content of this standard cites the following documents or articles therein. Where the cited documents are not dated, its valid version applies to this standard.

GB 3096 Acoustic Environmental Quality Standards

GB 3785 Electrical and Acoustic Performance of Sound Level Meters and Test Methods

GB/T 3241 Octave and Fractional Octave Filters

GB/T 15173 Acoustic Calibrators

GB/T 15190 Technical Specification for the Delineation of Applicable Zones for Ambient Noise in Urban Areas

3. Terms and Definitions

The following terms and definitions are applicable to this standard.

3.1 Environmental noise at the factory boundary of industrial enterprises industrial enterprises noise

Refers to the sound generated by the use of fixed equipment, etc. in industrial production activities, measured and controlled at the factory boundary to interfere with the surrounding living environment.

3.2 A sound level A-weighted sound pressure level

The sound pressure level measured by A-weighted network, expressed by A L, unit dB (A).

3.3 Equivalent continuous A-weighted sound pressure level

Equivalent continuous A-weighted sound pressure level

Equivalent continuous A-weighted sound pressure level refers to the energy average of the A-weighted sound pressure level within a specified measurement time T, and is expressed as LAeq,T (abbreviated as Leq), with the unit dB(A). Unless otherwise specified, all noise values in this standard are equivalent sound levels.

According to the definition, the equivalent sound level is expressed as:

In the formula: LA - t time instantaneous A sound level;

T - the specified measurement time period.

3.4 Plant boundary boundary

The boundary of the place or building to which the owner has the right of use (or ownership) as determined by legal documents (such as land use certificate, real estate certificate, lease contract, etc.). Various noise-generating fixed equipment plant boundaries for its actual occupation of the boundary.

3.5 Noise-sensitive buildings niose-sensitive buildings

Refers to hospitals, schools, institutions, research units, residential buildings that need to be kept quiet.

3.6 Daytime day-time, night-time

According to the Law of the People's Republic of China on Prevention and Control of Environmental Noise Pollution, "daytime" refers to the period between 6:00 and 22:00;

" Nighttime" refers to the period between 22:00 and 6:00 the next day.

People's governments at or above the county level for the prevention and control of environmental noise pollution needs (such as taking into account the time difference, differences in habits of work and rest, etc.) and the division of daytime and nighttime otherwise provided, shall be implemented in accordance with its provisions.

3.7 Frequent noise frequent noise

It refers to the noise that occurs frequently, the time and interval of occurrence have a certain regularity, and the duration of a single time is shorter, and the intensity is higher, such as the exhaust noise, cargo loading and unloading noise and so on.

3.8 Occasional noise sporadic noise

It refers to the noise that occurs by chance, the time and interval of occurrence are not regular, the duration of a single time is shorter, and the intensity is higher. Such as short whistle sound, engineering blasting noise.

3.9 maximum sound level

In the specified measurement time for frequent or occasional noise events measured A sound level maximum, with Lmax, unit dB (A).

3.10 Sound pressure level in octave bands sound pressure level in octave bands

Using the octave filter in accordance with the provisions of GB/T3241 measured band sound pressure level, the measurement bandwidth and the center frequency is proportional to the center frequency. This standard adopts the indoor noise spectrum analysis octave band center frequency of 31.5HZ, 63HZ, 125HZ, 250HZ, 500HZ, which covers the frequency range of 22HZ ~ 707HZ.

3.11 Steady noise steady noise

In the measurement time, the sound level of the measured source does not fluctuate more than 3dB of noise.

3.12 Non-steady noise

Noise whose sound level fluctuates more than 3dB during the measurement time.

3.13 background noise

The sum of ambient noise from sources other than the measured noise source.

4. Environmental noise emission limits

4.1 Environmental noise emission limits at plant boundaries

4.1.1 The environmental noise at the plant boundaries of industrial enterprises shall not exceed the emission limits specified in Table 1.

Table 1 Limit values of environmental noise emission at factory boundaries of industrial enterprises

Unit: dB (A)

4.1.2 The maximum sound level of nocturnal frequency noise shall not exceed the limit value by more than 10 dB (A).

4.1.3 The amplitude of the maximum sound level exceeding the limit value for occasional noise at night shall not be higher than 15 dB(A).

4.1.4 If industrial enterprises are located in areas not divided into functional areas of the acoustic environment, when there are noise-sensitive buildings outside the plant boundary, the local people's government at or above the county level shall refer to the provisions of GB 3096 and GB/T 15190 to determine the requirements for the quality of the acoustic environment in the area outside the plant boundary, and implement the corresponding limit values for the emission of ambient noise at the plant boundary.

4.1.5 When the distance between the plant boundary and the noise-sensitive buildings is less than 1m, the plant boundary ambient noise should be measured indoors in the noise-sensitive buildings, and the corresponding limits in Table 1 minus 10dB(A) as the basis for evaluation.

4.2 Limits for indoor noise emission from fixed equipments transmitted by structures

When the noise emitted from fixed equipments is transmitted to the indoor of noise-sensitive buildings through the building structures, the indoor equivalent sound level of the noise-sensitive buildings shall not exceed the limits stipulated in Table 2 and Table 3.

Table 2 Indoor noise emission limits for structure-borne fixed equipment (equivalent sound level)

Unit: dB(A)

Table 3 Indoor noise emission limits for structure-borne fixed equipment (octave-band sound pressure level)

Unit: dB

5 Measurement Methods

5.1 Measurement Instrument

5.1.1 The measurement instrument is integral mean sound level meter. Measuring instruments are integral average sound level meter or automatic environmental noise monitor, whose performance should be no less than the requirements of GB3785 and GB/T17181 for type 2 instruments. Measurement of noise below 35 dB should use Type 1 sound level meter, and the measurement range should meet the needs of the measured noise. The instrument used for calibration shall meet the requirements of GB/T 15173 for level 1 or level 2 sound calibrators. When it is necessary to analyze the spectrum of the noise, the performance of the instrument should meet the requirements of the filter in GB/T3241.

5.1.2 Measuring instruments and calibrating instruments should be regularly calibrated and used within the effective period of use;

Before and after each measurement, acoustic calibration must be carried out at the measurement site, and the deviation of its pre- and post-calibration values shall not be more than 0.5 dB, otherwise the measurement results are invalid.

5.1.3 Microphone windshield during measurement.

5.1.4 Measuring instrument time weighting characteristics set to "F" gear, sampling time interval is not greater than 1s.

5.2 Measuring conditions

5.2.1 Meteorological conditions: Measurement should be carried out in the absence of rain, snow, lightning, wind speed of 5m / s or less. If the measurement has to be made under special weather conditions, necessary measures should be taken to ensure the accuracy of the measurement, and the measures taken and the weather conditions should be indicated at the same time.

5.2.2 Measurement conditions: Measurement should be carried out during the normal working hours of the sound source under test, and the working conditions should be indicated at the same time.

5.3 Location of Measurement Points

5.3.1 Layout of Measurement Points

According to the sound source of the industrial enterprise, the layout of the surrounding noise-sensitive buildings, and the adjoining regional categories, a number of measurement points shall be laid out in the factory boundaries of the industrial enterprise, which include the positions closer to the noise-sensitive buildings and those that are greatly affected by the measured sound source.

5.3.2 General provisions for the location of measurement points

In general, the measurement point is selected at a location 1m outside the factory boundary of the industrial enterprise, with a height of 1.2m or more, and a distance of not less than 1m from any reflective surface.

5.3.3 Other provisions of the location of the measurement point

5.3.3.1 When there is a fence in the factory boundary and the surrounding noise-sensitive buildings are affected, the measurement point should be selected in 1m outside the factory boundary, higher than the wall 0.5m above the location.

5.3.3.2 When the plant boundary can not be measured to the actual emission of sound sources (such as sound sources located in the air, the plant boundary with sound barriers, etc.), should be 5.3.2 to set up the measurement point, and at the same time, in the affected noise-sensitive buildings outdoor 1m to set up another measurement point.

5.3.3.3 Indoor noise measurement, indoor measurement points are located at least 0.5m above any reflective surface, 1.2 m height from the ground, and the measurement is made in the direction of the noise affected by the window open state.

5.3.3.4 Fixed equipment structure sound transmission to the noise-sensitive building indoor, in the noise-sensitive building indoor measurement, the measurement point should be at least 0.5m from any reflective surface, from the ground at a height of 1.2 m, from the external window more than 1 m, the window is closed state measurement. Other sound sources in the room to be measured that may interfere with the measurement (such as televisions, air conditioners, exhaust fans, and ballast louder fluorescent lamps, clocks, etc.) should be turned off.

5.4 Measurement Period

5.4.1 Measurement shall be made during daytime and nighttime respectively. The maximum sound level shall be measured at the same time at night when there are frequent and occasional noise effects.

5.4.2 The measured sound source is steady state noise, and the equivalent sound level of 1min is used.

5.4.3 If the sound source under test is non-stationary noise, measure the equivalent sound level of the sound source under test in representative time periods, and if necessary, measure the equivalent sound level of the sound source under test in the whole normal working period.

5.5 Background noise measurement

5.5.1 Measurement environment: not affected by the measured sound source and other acoustic environments are consistent with that of the measured sound source.

5.5.2 Measurement period: the same length of time as the measurement of the measured source.

5.6 Measurement records

Measurement records shall be made during the noise measurement. The content of the record shall mainly include: name of the measured unit, address, type of sound environment functional zone at the plant boundary, meteorological conditions at the time of measurement, measuring instrument, calibration instrument, location of measurement point, time of measurement, measurement period, calibration value of the instrument (before and after measurement), main sound sources, measurement conditions, schematic diagram (location of the plant boundary, sound sources, noise-sensitive buildings, measurement points, etc.), noise measurement value, background value, and the person who takes the measurement, Calibrator, auditor and other relevant information.

5.7 Correction of Measurement Results

5.7.1 If the difference between the noise measurement value and the background noise value is more than 10dB(A), the noise measurement value will not be corrected.

5.7.2 When the difference between the measured noise value and the background noise value is between 3dB(A) and 10dB(A), the difference between the measured noise value and the background noise value is rounded to the nearest integer, and then corrected according to Table 4.

5.7.3 Noise measurements and background noise value difference of less than 3dB (A), measures should be taken to reduce the background noise, as appropriate, according to 5.7.1 or 5.7.2 implementation;

Still can not satisfy the requirements of the first two paragraphs, should be in accordance with the relevant provisions of the technical specifications for environmental noise monitoring.

Table 4 Correction table of measurement results

Unit is dB(A)

6. Evaluation of measurement results

6.1 Measurement results of each measurement point shall be evaluated separately. The daily measurement results of the same measurement point shall be evaluated by daytime and nighttime.

6.2 The maximum sound level Lmax is evaluated directly.

7. Supervision of the implementation of standards

This standard is supervised by the administrative department of environmental protection of the people's governments at or above the county level.