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HJ 2523-2012

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HJ 2523-2012English239 Add to Cart Days<=3 Technical requirement for environmental protection product. Silencers for ventilation Valid HJ 2523-2012
HJ 2523-2012Chinese14 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]

Detail Information of HJ 2523-2012; HJ2523-2012
Description (Translated English): Technical requirement for environmental protection product. Silencers for ventilation
Sector / Industry: Environmental Protection Industry Standard
Classification of Chinese Standard: J88
Classification of International Standard: 23.120
Word Count Estimation: 9,968
Older Standard (superseded by this standard): HJ/T 16-1996
Quoted Standard: GB/T 4760; GB/T 20431; GB 50243
Drafting Organization: China Environmental Protection Industry Association (Noise and Vibration Control Committee)
Regulation (derived from): Department of Environmental Protection Notice No. 47 of 2012;
Summary: This standard specifies the technical requirements for ventilation silencer, test methods and inspection rules. This standard applies to projects supporting the use of ventilation and air conditioning muffler.

HJ 2523-2012
Technical requirement for environmental protection product.Silencers for ventilation
People's Republic of China National Environmental Protection Standards
Replacing HJ/T 16-1996
Environmental protection product ventilation muffler
Technical requirement for environmental protection product
Silencers for ventilation
2012-7-31 release
2012-11-1 implementation
Issued by the Ministry of Environmental Protection
Table of Contents
Preface ..II
1. Scope .1
2 Normative references .1
3 Terms and definitions ..1
4. Technical Requirements .2
5 .2 Test Method
6 .3 inspection rules
7 logo .. 3
Appendix A (informative) muffler inspection record format 4
To implement the "People's Republic of China Environmental Noise Pollution Prevention Law," to improve the level of product quality ventilation silencers, ventilation silencers guide
Product development and production, the development of this standard.
This standard specifies the ventilation muffler technical performance indicators, test methods and inspection rules.
This standard is the "ventilation mufflers" (HJ/T 16-1996) amendments to the standard compared with the original main modifications are as follows:
- Acoustic Performance Evaluation octave band insertion loss to the arithmetic mean;
- Product range increased micro-perforated plate muffler, muffler HIP me, cellular muffler, canceled the disc muffler;
- Modify the standard limits, and the scope, normative references, technical requirements, test methods have been modified;
- An increase of terms and definitions, inspection rules, signs.
This standard was first published in 1996.
From the date of implementation of this standard, "Ventilation muffler" (HJ/T 16-1996) abolished.
This standard is developed by the Ministry of Environmental Protection Science, Technology organization.
This standard was drafted: China Environmental Protection Industry Association (Noise and Vibration Control Committee), Beijing Labor Protection Science Research Institute,
Shenzhen Ya Electrical and Mechanical Industry Co., Ltd., Institute of Building Physics China Academy of Building Research, Beijing Chong green acoustic engineering Co., Ltd.,
Shanghai Environmental Protection Engineering Co., Xinhua net.
This standard MEP July 31, 2012 for approval.
This standard since November 1, 2012 implementation.
The standard explanation by the Ministry of Environmental Protection.
Environmental protection product ventilation muffler
1 Scope
This standard specifies the technical requirements for ventilation muffler, test methods and inspection rules.
This standard applies to mufflers ventilation and air conditioning engineering supporting the use of.
2 Normative references
The standard content of the following documents cited in the articles. For undated references, the effective version applies to this standard.
GB/T 4760 Methods of measurement of acoustic muffler
GB/T 20431 acoustic muffler noise control guidelines
GB 50243 Construction Quality Acceptance of Ventilation and Air Conditioning Engineering
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1 ventilation muffler
Ventilation and air conditioning projects supporting the use of mufflers.
3.2 Insertion Loss
Muffler device compared with previous devices after muffler to reduce the amount of sound power level radiated noise nozzle. Decibels (dB).
3.3 Total pressure loss
Full pressure muffler between upstream and downstream. Unit Pascal (Pa).
3.4 drag coefficient
The average ratio of dynamic pressure and total pressure loss muffler upstream flanged cross section at.
2 '⎟⎠
⎛Δ =
tζ (1)
vP - according to internal test pipe GB/T 4760 to calculate the average flow dynamic pressure, the unit is Pascal (Pa);
S - cross-sectional area of the test tube, in square meters (m2);
'S - muffler upstream flanged sectional area, in square meters (m2).
3.5 octave band insertion loss arithmetic mean
At the center frequency of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8 octave band measurements of 8000Hz
Obtained the insertion loss of the arithmetic mean.
4. Technical Requirements
4.1 Basic requirements
4.1.1 ventilation muffler should be designed to comply with the provisions of GB/T 20431 of.
4.1.2 ventilation muffler should be manufactured in accordance with design drawings and technical documents through the muffler prescribed procedures approved by the manufacturer.
4.1.3 ventilation muffler production shall comply with the relevant provisions of GB 50243.
4.1.4 ventilation muffler structure size and material should be consistent with corporate design drawings.
4.1.5 ventilation muffler octave band insertion loss and resistance factor should meet the design requirements.
4.1.6 appearance quality The skin should be smooth, clean, no rust marks. Each joints should be neat, smooth, sealed, caulked should be uniform, firmly. paint coating should be strong, beautiful, does not allow holidays, sagging, blistering, pucker, scratches, flaking phenomenon. for the use of sound-absorbing material muffler, its protective surface should be smooth, no glitches, tight joints, no projections; surface protection materials
There should be no damage, the surface can not be contaminated with oil, paint, dust or other impurities.
4.2 Performance Requirements
Type test, the ventilation muffler octave band insertion loss and the arithmetic mean drag coefficient should meet the requirements of Table 1.
Table 1 ventilation muffler octave band loss and the arithmetic mean drag coefficient insert
Muffler type arithmetic mean octave band insertion loss dB/m drag coefficient
Straight ≥14 ≤1.0
Chip ≥14 ≤1.6
Folded plate ≥17 ≤4.0
Cellular ≥24 ≤2.4
Straight complex impedance chip ≥14 ≤1.6 ≥14 ≤1.0
Micro-perforated plate single straight tube ≥6 ≤1.0 piece ≥6 ≤1.6
Double microperfrated Straight ≥9 ≤1.0 piece ≥9 ≤1.6
Muffler elbow ≥7 -
Silencer plenum chamber ≥9 -
5 Test methods
5.1 Appearance quality by visual.
5.2 insertion loss, total pressure loss test method in accordance with the provisions of GB/T 4760 progresses, the drag coefficient according to equation (1) calculations.
5.3 test conditions and data processing requirements
The average air velocity 5.3.1 muffler upstream of the mouth of the flange is preferably 3 m/s ~ 12 m/s, and the average flow rate should be between the sheets is not greater than 12m/s.
5.3.2 Each muffler should be measured three kinds of velocity data, two of which flow rate should be an integer multiple relationship; following these types of flow rate coefficient of resistance
The arithmetic mean as the final result of the drag coefficient.
5.3.3 type test, the effective length of the muffler should be in the 0.9 m ~ 1.1 m within the scope of the muffler upstream flanged pipe cross-sectional area and test
The plot ratio should be controlled within a range of 0.7 to 1.4, the transition duct side wall divergence angle should not exceed 30 °.
5.3.4 type test, if the effective length of the muffler is not 1 m, should each octave band insertion loss of flow rate in addition to the arithmetic mean
The effective length of the muffler as the final result. Silencer elbow, silencer plenum chamber regardless of the effective length.
5.3.5 All measurements should be accurate to one decimal place.
6 Inspection rules
6.1 Inspection classification
The test is divided into muffler factory inspection and type test.
6.2 factory inspection
6.2.1 Each muffler should be after the manufacturer's quality inspection department inspection and issue a certificate, before the factory.
6.2.2 factory inspection items carried by 4.1.4 and 4.1.6.
6.3 Type inspection
6.3.1 When one of the following conditions, type of inspection should be carried out:
Shape identification a) the new product;
B) after the official production, when the design, process, materials are major changes that may affect product performance;
c) Normal production, inspection once every three years;
D) After a long-term shutdown, resume production;
e) Quality Supervision, Inspection bodies type inspection requirements.
6.3.2 Sampling Method
From the factory inspection and meets the requirements of this standard 5.3.3 product, each randomly selected units.
6.3.3 Test items
Type test for the entire test items specified in paragraph 4.1.6,4.2,7.1.
6.3.4 decision rule
Type test result a) general or conventional muffler shall comply with the requirements in Table 1, when a failed project, should be doubled sampling re-examination.
If still fail, it is determined to be ineligible for this type of inspection.
b) for non-standard or shaped muffler type test, given only test data, not its eligibility determination or description.
7 logo
7.1 conspicuous place in the product should be factory inspection certificate and includes the following product logo:
a) the product name;
b) Model or specifications;
c) manufacturer's name or trademark;
d) the date of manufacture or the manufacturing number.
7.2 Installation direction of airflow requirements should be part of the product clearly indicated the direction of airflow.
Appendix A
Muffler inspection record format
Product number
Velocity of flow
OCTD drag coefficient of drag coefficient of the average pressure loss Pa dB dB/m
Velocity of flow
Octave band insertion loss dB A-weighted insertion loss
63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz dB (A) dB (A)/m
S m2 S 'm2 stream temperature ℃ muffler effective length m
Quality and appearance of signs
Exterior seams paint surface protection flag
Explanation: The table "insertion loss" in dB or dB (A), showing that the failure to convert the length of insertion loss; in units of dB/m or
dB (A)/m, showing the insertion loss is translated by the length of the post.
Detection Date: The date
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