What Are the Different Types of Hearing Protectors?

Hearing protection regulations for employees in industrial enterprises is a basic law established in China to protect the labor rights and interests of enterprise employees.

Hearing protection for workers in industrial enterprises

Hearing protection regulations for employees in industrial enterprises is a basic law established in China to protect the labor rights and interests of enterprise employees.

Chinese name

Hearing protection for workers in industrial enterprises

Issuing unit

· [Title of the Regulations] Regulations on Hearing Protection of Industrial Workers

· [Issued by]

Chapter I General Provisions

Chapter II Basic Contents and Requirements of Hearing Protection

Chapter III Noise Monitoring

Chapter IV Hearing Test and Evaluation

Chapter V Engineering Control

Chapter 6 Ear Protectors

Chapter VII Hearing Protection Training

Chapter VIII Record Keeping

Chapter IX Supplementary Provisions

Chapter I General Provisions

The first is to protect the hearing of employees operating in a strong noise environment and reduce the incidence of occupational noise deafness. This code is formulated in accordance with the Labor Law and relevant regulations on prevention and treatment of occupational diseases.

Article 2 This specification applies to the hearing protection of employees in various types of industrial enterprises (hereinafter referred to as "enterprises") in noisy workplaces. Every enterprise that has employees exposed to an equivalent sound level of 85 decibels or more (hereinafter referred to as "LAeq, 885dB") every 8 hours should implement this specification.

Article 3 An enterprise shall, in accordance with the requirements of this specification, formulate a hearing protection plan for its employees in accordance with its actual situation, and designate personnel who have received special training to organize and implement it.

Chapter II Basic Contents and Requirements of Hearing Protection

Article 4 Hearing protection referred to in this specification includes noise monitoring, hearing testing and assessment, engineering control measures, requirements and use of ear protectors, employee training, and record keeping.

Article 5 An enterprise shall, based on noise monitoring, determine the employee population to which it is exposed to LAeq, 885dB. The monitoring results shall be notified to the relevant staff in writing.

Article 6 For employees exposed to LAeq, 8 85dB, basic hearing measurements and regular follow-up hearing measurements should be performed to assess whether employees have high-frequency standard hearing threshold shift (HSTS). When the average hearing threshold change at the frequencies of 3000, 4000, and 6000 Hz in any ear is equal to or greater than 10 dB in the tracking hearing measurement relative to the basic hearing measurement, it is determined that the high-frequency standard hearing threshold shift occurs. For employees with high-frequency standard hearing threshold excursions, companies must take hearing protection measures to prevent further hearing loss.

Article 7 Employees who are exposed to LAeq at the work place, 8 90dB, should give priority to adopting engineering measures to reduce noise at the work place. Noise control equipment must be maintained frequently to ensure the effectiveness of noise control.

Article 8 Employees who are exposed to LAeq, 885dB, shall be equipped with ear protectors with sufficient sound attenuation and comfortable wearing, and regularly conduct hearing protection training, check the use and maintenance of ear protectors, and ensure the effect of hearing protection.

Article 9 Enterprises shall establish hearing protection archives, record, analyze and preserve noise exposure monitoring data and hearing test data in accordance with regulations.

Chapter III Noise Monitoring

Article 10 An enterprise shall monitor the noise of the workplace and the noise exposure of employees at least once a year. When the noise level in the workplace may change, the change should be monitored in a timely manner.

Article 11 To measure steady-state noise, the slow time characteristic of the sound level meter A network can be used, and the average reading within 5 seconds is taken as the equivalent continuous sound level. The sound level meter shall adopt a sound level meter of type 2 or more in accordance with the national standard "Electrical and Sound Performance and Measurement Methods of Sound Level Meter" (GB 3785).

Article 12 To measure non-steady-state noise, an integrated sound level meter of more than type 2 or a personal noise exposure meter (dose meter) shall be used. The measuring instrument should comply with the national standard "Integral Average Sound Level Meter" (GB / T 17181) or the national standard "Technical Requirements for Personal Sound Exposure Meters" (GB / T 15952).

Article 13 The measurement point shall be selected at the head position of the employee's operating point, and the employee need not be present. If an employee needs to be present or walking around, the height of the measurement point should refer to the height of the human ear, and the horizontal distance from the external ear canal is about 0.1 meters.

Article 14 The details of measurement technology and the completion of record reports can refer to the international standard "Acoustics-Guidelines for Measurement and Evaluation of Noise Exposure in the Operating Environment" (ISO 9612) and relevant national standards.

Article 15 Noise measuring instruments shall be subject to regular statutory inspection in accordance with regulations, and noise monitoring personnel shall have received relevant professional training.

Chapter IV Hearing Test and Evaluation

Article 16 Employees who work for the first time in LAeq, 8 85dB places shall receive a hearing test within 3 months. The resulting audiogram is called a basic audiogram. Employees who have worked in LAeq, 885dB before the release of this specification, but have not undergone a basic hearing test, shall make a basic hearing test within one year from the date of this specification.

Article 17 Employees who are exposed to 85dBLAeq, 8 <100dB noise workplaces shall perform tracking hearing measurement every two years; those who are exposed to LAeq, 8100dB shall perform tracking hearing measurement once a year. The tracking audiogram is compared with the basic audiogram, and other influencing factors are excluded. After correction according to the provisions of "Acoustics-Air Conduction Threshold of Normal Otology and Age and Gender" (GB 7582), it is used as an assessment of whether employees have occurred. Basis for high-frequency standard hearing threshold shift due to occupational noise hazards.

Article 18 For employees who have undergone a high-frequency standard hearing threshold shift, they shall notify me of the test results in writing within 14 days and take corresponding hearing protection measures.

Article 19 The audiometer used in the hearing test shall meet the requirements of the national standard "Audiometer Part 1: Pure Audiometer" (GB / T 7341.1); the calibration of the audiometer and the environmental noise of the listening room shall comply with the national standard "Acoustics Measurement of air conduction hearing threshold in normal otologyhearing protection (GB 7583). Hearing testers should have received relevant professional training.

Article 20 Within 14 hours before the hearing test, the employees tested shall not be exposed to noisy workplaces and other non-occupational noise environments.

Article 21 Hearing tests shall use pure tone air conduction method. The test frequency should include at least 500, 1000, 2000, 3000, 4000, and 6000 Hz.

Chapter V Engineering Control

Article 22 Engineering measures include setting up a sound insulation monitoring room, installing a sound insulation cover for a strong noise unit, sound absorption treatment at the work place, assembling a muffler on the sound source or sound path, and vibration isolation treatment of equipment. In management, special attention should be paid to the selection of low-noise equipment, parts and new processes, replacing the old high-noise equipment, parts and production processes.

Article 23 Prior to taking engineering control measures, the main noise sources and their characteristics should be identified first in order to improve control efficiency and reduce engineering costs.

Article 24 For places where there is strong noise equipment and employees do not need to work near the equipment for a long time, a sound insulation monitoring room should be set up; where workers need to work near strong noise equipment for a long time and have strong reverberation noise, they should As far as possible, take sound absorption and noise reduction measures to make the average sound absorption coefficient of the place higher than 0.3. For places with a small number of noise sources and relatively concentrated, easy to handle, priority should be given to sound source isolation measures to reduce noise. The noise control design of an enterprise shall comply with the requirements of the national standard "Code for Design of Industrial Enterprises Noise Control" (GBJ 87) and the international standard "Acoustics-Recommended Practice for Design of Low Noise Workplaces" (ISO 11690).

Chapter 6 Ear Protectors

Article 25 An enterprise shall provide more than three types of ear protectors (including earplugs or earmuffs of different types and models) for selection by employees exposed to LAeq, 8 85dB workplaces.

Article 26 After wearing ear protectors, the equivalent sound level actually accepted by employees shall remain below 85dB.

Article 27 The actual sound attenuation value of ear protectors is calculated according to the following method: The laboratory test value of the ear protector or the manufacturer's nominal value is converted into the international standard "Effective A-weighted sound when wearing ear protectors" The evaluation of the single-value noise reduction (SNR) of the ear protectors as defined in "Class Evaluation" (ISO 4869-2), then multiplied by 0.6. The single-value noise reduction of the ear protectors can be calculated according to the ISO standard or relevant national standards.

Chapter VII Hearing Protection Training

Article 28 An enterprise shall provide hearing protection training to employees exposed to LAeq, 8 85dB workplaces each year.

Article 29 Hearing protection training shall include the following:

(1) the harm of noise to health;

(2) the purpose and procedure of the hearing test;

(3) The actual situation of noise of the enterprise and the general methods of noise hazard control;

(D) the purpose of using ear protectors, the advantages and disadvantages of various types of ear protectors, sound attenuation values and how to select, wear, store and replace them.

Article 30 When the work place, production equipment or protective equipment is changed, the training content shall be updated accordingly.

Chapter VIII Record Keeping

Article 31 An enterprise shall properly keep records of noise measurement at the workplace, noise exposure measurement of employees, hearing test of employees, and use and management of ear protectors.

Article 32 The hearing test records of employees shall include the following main items:

(1) name and type of work of the employee;

(2) the date and place of the test, and the time before the test to leave the noise environment;

(3) the name of the tester;

(4) The latest acoustic calibration data and verification date of the audiometer;

(5) Environmental noise level data of the listening room;

(6) Test results.

Article 33 The measurement of noise in the workplace and the measurement of the noise exposure of employees shall be announced to the employees regularly; at the request of the employees, the personal hearing protection records shall be available for inspection at any time.

Article 34. If the employee is transferred to another enterprise, if the enterprise continues to engage in noise-exposed operations, the original enterprise shall transfer all relevant records to the new unit.

Chapter IX Supplementary Provisions

Article 35 Actions in violation of this Code shall be handled in accordance with relevant regulations.

Article 36 The standards quoted in this specification are valid versions at the time. When implementing this specification, care should be taken to choose the latest version of the corresponding standard.