HG 20503-1992 Noise Control Design Regulations for Chemical Construction Projects
Some standard content:
Industry Standard of the People's Republic of China
Noise Control Design Regulations for Chemical Construction Projects HG 20503-92
Editor: Jilin Chemical Industry Company Design Institute Approval Department: Ministry of Chemical Industry
Ministry of Chemical Industry
Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
1 General Principles
1.0.1 This regulation is formulated in accordance with the "Noise Control Design Specifications for Industrial Enterprises" and the "Environmental Protection Design Regulations for Chemical Construction Projects".
1.0.2 The fundamental task of this regulation is to make the design of chemical construction projects follow the "Regulations of the People's Republic of China on the Prevention and Control of Environmental Noise Pollution", implement the principles and policies of environmental protection and labor protection, strictly control noise pollution, protect the physical and mental health of employees, and protect and improve the acoustic environment of the factory and its surroundings.
1.0.3 This regulation applies to the noise control design (except impulse noise) of new construction, expansion, reconstruction and technical construction projects of the entire chemical industry. In addition to the provisions of this chapter, the noise control design of chemical construction projects shall also comply with the provisions of other relevant national standards and specifications. 2 Principles and regulations 2.0.1 Noise control design shall conduct a comprehensive analysis of production processes, operation and maintenance, noise reduction effects, etc., and adopt advanced and applicable new processes, technologies, new materials, and new equipment to improve efficiency, reduce costs, and strive to obtain the best environmental and economic benefits. 2.0.2 The noise generated by the production process and equipment shall first be controlled from the sound source, and low-noise processes and equipment shall be used as much as possible to replace high-noise processes and equipment. If the noise reduction requirements are still not met, necessary measures shall be taken. 2.0.3 If the production workshops and workplaces still fail to meet the noise control design requirements after taking operational measures, personal protective measures shall be taken. 2.0.4 Noise control design shall be fully demonstrated and reasonably laid out in terms of site selection, general layout planning, workshop and equipment layout, etc., to reduce the impact of high noise sources on the external environment.
The noise control design of chemical construction projects must be carried out at the same time as the design of the main project.
3 Overall design regulations
3.1. General regulations
3.1.1 The overall design of chemical construction projects should fully consider the impact of noise on the surrounding environment. For a few places and equipment that do not meet the standards, noise control design should be carried out from the perspective of personal protection and building acoustics (fewer windows and doors). 3.1.2 Noise sources that have a greater impact on the outside world (such as high-frequency noise such as exhaust venting and regulating valves) should be as far away from the factory boundary as possible under the conditions permitted by the process flow and set up in a relatively hidden area in the wide area.
3.2 Site selection
3.2.1 Site selection for chemical enterprises that generate high noise 3.2.1.1 The site should be selected in a concentrated industrial area and should not be selected in a noise-sensitive area.
3.2.1.2 It should be located on the upwind side of the lowest wind frequency in summer or the downwind side of the dominant wind direction in the year-round living area. If necessary, it should be located in the suburbs away from the urban area. 3.2.2 Site selection for chemical enterprises sensitive to external noise exposure 3.2.2.1 Precision assembly, research institutes and other departments should avoid site selection in high noise areas and try to stay away from noise-affected areas such as both sides of highway trunk lines, along railways, and airports. 3.2.2.2 It should be located on the downwind side of the lowest wind frequency in summer or the upwind side of the dominant wind direction in the year-round surrounding main noise sources. 3.2.3 Site selection should make full use of local natural barriers and buffer areas. For example, hills, green spaces, mountains, tall buildings, structures, etc. 3.2.4 According to the characteristics of chemical enterprise production and environmental pollution, the site should be selected in the suburbs and open areas away from 24
living areas. 3.3 General layout
3.3.1 In combination with functional zoning and process zoning, the general layout design principle of "separating noisy and quiet areas" should be noted, and high-noise workshops and low-noise workshops, office institutions, non-productive buildings, etc. should be reasonably arranged.
3.3.2 Around high-noise workshops (such as compressor rooms, fan rooms, etc.), it is advisable to arrange buildings and structures that are less sensitive to noise, tall, and oriented in a direction that is conducive to sound insulation. 3.3.3 Buildings and structures that are less sensitive to noise should be arranged on both sides of the traffic arteries as much as possible, and the distance from the traffic arteries should be no less than 40m (referring to the distance from the roadside to the building). 3.3.4 The facade layout of chemical enterprises should make full use of the sound insulation effect of terrain and landforms. High noise sources should be arranged at low positions. The facade layout of noise-sensitive areas should make full use of natural barriers, etc.
3.3.5 Noise prevention measures in transportation design of chemical enterprises 3.3.5.1 Transportation routes such as trains and cars should not pass through densely populated areas 3.3.5.2 When arranging roads in noise-sensitive areas, measures should be taken to reduce the impact of traffic noise.
3.3.5.3 The setting of railway stations should make full use of the sound insulation effect of surrounding buildings and structures. The loudspeakers in the workplace should not be directed to noise-sensitive areas and living areas. 3.3.5.4 The protective distance between railway stations and noise-sensitive areas shall not be less than 100m.
3.3.6 According to the characteristics of chemical production, the overall layout should fully consider the protective distance between various production devices, and try to plant flowers, grass and trees, which can not only purify the environment, but also help reduce the noise of the devices.
Noise control design regulations
4.1 General regulations
4.1.1 Noise control at various locations within the factory area
4.1.1.1 Unit of measurement
The noise level of chemical equipment is expressed in A-weighted sound level, and the symbol is dB (A). 4.1.1.2 Noise spectrum
The spectrum of the sound pressure level of each frequency band of chemical equipment is expressed in octave sound pressure level, and the center frequency is 8 segments, see Table 4.1.1.2.
Octave center frequency
Table 4.1.1.2
The average sound pressure level of the envelope surface of chemical equipment 1m away from the outer surface shall not be greater than the limit value of 90dB (A). For equipment that does not reach this limit value, control measures should be taken.
Noise limits for various locations within the chemical enterprise plant area are shown in Table 4.1.1.4
Noise limits for various locations within the wide area
Location category
Production workshop and workplace (workers are exposed to noise for 8 hours a day) Duty room, observation room, rest room, control room set up in the commercial noise workshop (indoor background noise level)
When there is no telephone communication requirement
When there is a telephone communication requirement
Precision assembly line, precision processing workshop work place, computer room (normal working state)
Workshop office, laboratory
(indoor background noise level)
Table 4.1 .1.4
Noise limit value
Main control room, centralized control room, communication room, telephone switchboard room, fire duty room, dispatch room (indoor background noise level)
Office meeting room, design room, central laboratory, accounting room, research institute, study room (indoor background noise level)
Infirmary, classroom, nursing room, nursery, workers' shift dormitory (indoor background noise level)
Library, reading room, factory broadcasting studio
(indoor background noise level)
Note: Indoor background noise level is the average noise level transmitted from the outside through walls, doors and windows into the room under the condition that there is no sound source in the room.
4.1.2 Wide-boundary noise
The noise A level radiated from the wide-boundary noise to the wide-boundary shall not exceed the environmental noise standard value of the area adjacent to the factory boundary. The standard value is shown in Table 4.1.2. 27
Factory boundary noise limit value
Unit: Equivalent sound level Leg (dBA)
Environmental categories of areas adjacent to factory boundaries
Special residential areas, sanatoriums
Residential, cultural and educational areas
Residential, commercial, industrial mixed areas
Commercial center areas
Industrial areas
Areas on both sides of traffic arterial roads
4.1.3 Noise levels of major noise sources
4.1.3.1 The noise level of heating furnaces, fans, industrial pumps, compressors, etc. should not be greater than 90dBA).
4.1.3.2 The noise level of various gas or steam discharge outlets should not be greater than 90dB (A). The noise level of the emergency vent during shutdown should not be greater than 100dB (A). In special emergency situations, the vent for emergency venting directly discharged into the atmosphere should be located 30m away from where workers often stay, and the noise 1m away from the vent should not exceed 135dB (A).
4.1.3.3 The noise level of the flare should not be greater than 90dB (A). In an accident state, the noise level should not be greater than 100dB (A).
4.2 Wang Yi, pipe over noise prevention and noise reduction design
4.2.1 Process design
Try to avoid impact processes and use low-noise products and low-noise processes. 4.2.2 Pipeline design
On the premise of meeting the production process, the following items should be considered: 4.2.2.1 The connection between pipelines and strongly vibrating devices, structures, brackets, etc. should be flexible, and the pipeline connection should adapt to the downstream direction. 4.2.2.2 Correctly select the pipeline section and flow rate, and avoid the noise impact caused by sudden changes in the pipeline section and high flow rate. Strong noise pipelines should be arranged underground or take necessary noise reduction and sound insulation measures.
4.2.2.3 Select valves with tight structure, low noise valves and regulators. Equipment selection
4. 2. 3. 1
Hoods, etc.
It is advisable to select products with low noise and low vibration. Consider the selection of special equipment for noise control, such as silencers and sound insulation. 4.2.3.3
Hydraulic and hydraulic equipment should be used, and stamping and pneumatic equipment should be used less. 5 Noise control of chemical plants and auxiliary facilities 5.1 Noise control of chemical plants and equipment
5.1.1 Plane layout
5.1.1.1 Under the premise of meeting the process flow, high-noise equipment and low-noise equipment should be separated as much as possible. High-noise equipment should be kept away from noise-sensitive areas and arranged relatively concentratedly.
5.1.1.2 When arranging equipment, attention should be paid to the directivity characteristics of noise propagation. Gas vents should be kept away from noise-sensitive areas to avoid noise disturbance. 5.1.1.3 For workshops located at the boundary of the factory area, try to keep the outer wall facing the boundary side open or open as few doors and windows as possible.
5.1.1.4 For knocked or semi-opened devices (workshops), it is advisable to set "shutter" sound-absorbing panels at the knocked-open part, or install sound-absorbing screens opposite the semi-open part. 5.1.1.5 Equipment with strong vibration should be arranged on the ground floor as much as possible, and should not be arranged on a platform connected to the floor.
5.1.1.6 When arranging equipment, the space required for the installation, maintenance and operation of the noise control equipment should be considered. 5.1.1.7 The doors and windows of the operation room and control room in the workshop should be opened in the direction away from the strong noise source.
5.1.2 For high-noise equipment whose noise exceeds the environmental allowable standard, it is best to install it in the room, such as setting up a fan room, air compressor room, pump room, etc. 5.1.3 The main control room should be facing away from and away from the main sound source, but when it must face the sound source for operation and control, measures such as soundproof windows, soundproof doors, and wall sound absorption treatment should be taken. 5.1.4 For exhaust vents exceeding 1.96×10'Pa and motors exceeding 30kW, noise prevention measures should be taken. Y and YB series low-noise motors can be selected for motors. 5.1.5 Reasonably select and equip various types of valves. The pressure head and displacement of the pump should be operated in the high efficiency area as much as possible to reduce hydraulic noise, and it should also be considered that the pressure head is not too high and the displacement is not too large, which will cause the regulating valve to produce high noise. 5.2 Noise control of auxiliary facilities
5.2.1 Noise control of boiler room
5.2.1.1 The boiler blower and induced draft fan should be placed in the same closed fan room in the boiler room. The blower draws air in the room, and the factory is equipped with an air inlet silencer or silencer. 5.2.1.2 The blower of the self-contained power station boiler should be equipped with inlet and outlet silencers, and a vibration isolation flexible pipe should be installed between the air outlet 30
and the pipeline. The induced draft fan can be wrapped in combination with heat insulation, waterproofing and sound insulation
5.2.1.3 The steam pressure reducing device in the boiler room should be placed in a soundproof room, otherwise the pressure reducing valve should be equipped with a soundproof cover.
5.2.1.4 For coal mills in boiler rooms, thermal rubber lining or soundproof screens may be considered.
5.2.2 Noise control in air compressor stations
5.2.2.1 For centrifugal air compressors, soundproof enclosures may be used; silencers shall be installed at the inlet and air supply pipes, and the pipes shall be wrapped with soundproof layers. Suitable silencers shall be selected for exhaust vents. 5.2.2.2 For piston air compressors, pit-type or expansion chamber silencers shall be used for the air inlet, and small-hole injection silencers shall be used for the exhaust. 5.2.3 Noise control in pump rooms
5.2.3.1 Soundproof enclosures or semi-soundproof enclosures shall be installed as required. 5.2.3.2 Vibration reduction devices shall be installed between the base and foundation of the pump, and flexible rubber joints shall be installed between the pump inlet and outlet and the pipeline.
5.2.4 Noise control in machine repair workshop
Vibration reduction measures should be taken between the base and foundation of various impact equipment such as forging hammers and punching machines, and vibration isolation trenches should be set around the foundation to suppress the propagation of vibration waves. A semi-enclosed soundproof cover can be installed on the working surface of the forging hammer. A muffler is installed on the exhaust pipe. 5.2.5 Noise control in oxygen production station
5.2.5.1 Centrifugal air compressors and oxygen compressors should be equipped with soundproof covers, and the motors of piston oxygen compressors should also be equipped with soundproof covers.
5.2.5.2 Small-hole injection mufflers should be installed at the discharge ports of air, argon, etc., and mufflers can be installed at the discharge ports of oxygen:
5.2.5.3 The pressure reducing valve should be installed in a soundproof room, otherwise a soundproof cover and a sound insulation layer should be added to the pressure reducing valve and the front and rear pipes.
5.2.6 Noise control in the fan room
5.2.6.1 The blower and transmission parts shall be equipped with full soundproof enclosures and semi-soundproof enclosures, which shall be well ventilated and easy to disassemble and repair.
5.2.6.2 The air inlet and air supply pipe of the blower shall be equipped with mufflers, and the air inlet and air supply pipes connected to the blower shall be set in a closed structure or wrapped with a sound insulation layer. 5.2..3 The air outlet of the blower shall be equipped with a suitable muffler. 3.2.7 Noise control in the main motor room
5.2.7.1 A semi-soundproof enclosure may be installed on the motor, or a muffler may be installed at the air inlet of the motor fan.
5.2.7.2 Sound absorption treatment may be carried out in the main motor room, and thyristors may be selected to replace the relay control system to eliminate mechanical electromagnetic noise. 6 Supplementary Provisions
6.0.1 The noise measurement of industrial equipment shall be carried out in accordance with GBJ122-88 "Noise Measurement Specifications for Industrial Enterprises".
The environmental noise measurement of chemical plant areas shall be carried out in accordance with the relevant provisions of the noise section of "Environmental Monitoring Technical Specifications" promulgated by the State Environmental Protection Agency. 6.0.3 The noise measuring instruments shall be calibrated and verified regularly at the national metrology department. The noise at the boundary of chemical plants shall be measured in accordance with GB12348~12349-90 "Noise Standards and Measurement Methods at the Boundary of Industrial Enterprises". 32
Appendix A
Main noise sources
Industrial furnaces
Pumps
Ball mills
Compressors and fans
Pipeline systems
Cooling towers
Gas vents
Steam heaters
Control room
Operation room
Laboratory
Office
Out-of-plant environment
Noise measurement position and height
Horizontal position of measuring points
Any direction, 1m from the furnace
From the machine Body surface
1m-2m from the body surface
Axial distance of air inlet to the pipe mouth plane
0.5m~1m (or one
pipe mouth diameter)Axial distance of air outlet to the motor western peripheral surface
1m-~2m
0.9m~1.2m
from flange wall
0.7m~1.0m
Select measuring points at 1.5m
around the cooling tower
Select measuring points on the circumference with the height of the torch as the diameter
At the vent and the medium flow direction
at 45 degrees, the distance from the vent shell surface is equal to the vent diameter
1m away from the body surface
Middle of the room
Middle of the room
Middle of the room
Middle of the room
1m away from the wall
3.5m away from the wall outside the factory
Height of measuring point
1.5m from the ground
Same height as the equipment axis, not lower than
0.5m, generally 1.5m
1.5m from the ground
Same height as the equipment axis, from the ground
Same height as the equipment axis, not
lower than 0.5m
Same height as the pipe axis
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
Number of measuring points
More than 3 points1
Hood, etc.
It is advisable to select products with low noise and small vibration. Consider the selection of special equipment for noise control, such as silencers and sound insulation 4.2.3.3
Hydraulic and hydraulic equipment should be used, and stamping and pneumatic equipment should be used less. 5 Noise control of chemical plants and auxiliary facilities 5.1 Noise control of chemical plants and equipment
5.1.1 Plane layout
5.1.1.1 Under the premise of meeting the process flow, high-noise equipment and low-noise equipment should be separated as much as possible. High-noise equipment should be kept away from noise-sensitive places and arranged relatively concentratedly.
5.1.1.2 When arranging equipment, pay attention to the directivity characteristics of noise propagation. Gas vents should be kept away from noise-sensitive areas to avoid noise disturbance. 5.1.1.3 For workshops located at the boundary of the factory area, try to open no or few doors and windows on the outer wall facing the boundary.
5.1.1.4 For knock-open or half-open devices (workshops), it is advisable to install "louver" sound-absorbing panels at the knock-open part, or install sound-absorbing screens opposite the half-open part. 5.1.1.5 Equipment with strong vibration should be arranged on the ground floor as much as possible, and should not be arranged on a platform connected to the floor.
5.1.1.6 When arranging equipment, the space required for the installation, maintenance and operation of the noise control special equipment used with it should be considered. 5.1.1.7 The doors and windows of the operation room and control room in the workshop should be opened in the direction away from the strong noise source.
5.1.2 For high-noise equipment whose noise exceeds the environmental allowable standard, it is best to install it in a room, such as a fan room, air compressor room, pump room, etc. 5.1.3 The main control room should be facing away from and away from the main sound source, but when it must face the sound source for operation and control, measures such as soundproof windows, soundproof doors, and wall sound absorption treatment should be taken. 5.1.4 For exhaust vents exceeding 1.96×10'Pa and motors exceeding 30kW, noise prevention measures should be adopted. Y and YB series low-noise motors can be selected. 5.1.5 Reasonably select and equip various types of valves. The pressure head and displacement of the pump should be operated in the high efficiency area as much as possible to reduce hydraulic noise, while also ensuring that the pressure head is not too high and the displacement is not too large, which would cause the regulating valve to generate high noise. 5.2 Noise control of auxiliary facilities
5.2.1 Noise control in the boiler room
5.2.1.1 The boiler room should place the boiler blower and induced draft fan in the same closed fan room, and the blower should inhale air indoors. The factory should be equipped with an air inlet silencer or silencer. 5.2.1.2 The blower of the self-contained power station boiler should be equipped with inlet and outlet silencers. A vibration isolation flexible pipe should be installed between the air outlet 30
and the pipeline. The induced draft fan can be wrapped with heat insulation, waterproofing and sound insulation
5.2.1.3 The steam pressure reducing device in the boiler room should be placed in a soundproof room, otherwise the pressure reducing valve should be equipped with a soundproof cover.
5.2.1.4 The coal mill in the boiler room can consider using hot rubber lining or sound insulation screen.
5.2.2 Noise control of air compressor station
5.2.2.1 For centrifugal air compressors, a soundproof cover can be used; silencers are installed at the inlet and air supply pipes, and the pipelines should be wrapped with sound insulation layers. Suitable silencers should be selected for exhaust vents. 5.2.2.2 Pit-type or expansion chamber silencers should be used for the air inlet of piston air compressors, and small hole injection silencers should be used for the exhaust port. 5.2.3 Noise control in pump room
5.2.3.1 Install a soundproof enclosure or semi-soundproof enclosure as required. 5.2.3.2 A vibration reduction device should be installed between the base and foundation of the pump, and a flexible rubber joint should be installed between the pump inlet and outlet and the pipeline.
5.2.4 Noise control in machine repair workshop
Vibration reduction measures should be taken between the base and foundation of various impact equipment such as forging hammers and punching machines, and a vibration isolation groove should be set around the foundation to suppress the propagation of vibration waves. A semi-enclosed soundproof enclosure can be installed on the working surface of the forging hammer. A muffler is installed on the exhaust pipe. 5.2.5 Noise control in oxygen production station
5.2.5.1 A soundproof enclosure should be installed for centrifugal air compressors and oxygen compressors, and a soundproof enclosure should also be installed for the motor of the piston oxygen compressor.
5.2.5.2 Small-hole injection silencers should be installed at the outlets for air, argon, etc., and silencers can be installed at the outlets for oxygen:
5.2.5.3 The pressure reducing valve should be installed in a soundproof room, otherwise, a soundproof cover and a soundproof layer should be added to the pressure reducing valve and the front and rear pipes.
5.2.6 Noise control in the fan room
5.2.6.1 The blower and transmission parts should be equipped with full soundproof covers and semi-soundproof covers, which should be well ventilated and easy to disassemble and repair.
5.2.6.2 The air inlet and air supply pipe of the blower must be equipped with silencers, and the air inlet and air supply pipes connected to the blower should be set in a closed structure or wrapped with a soundproof layer. 5.2..3 Suitable mufflers should be installed at the vents of the blowers. 3.2.7 Noise control in the main motor room
5.2.7.1 A semi-soundproof cover can be installed on the motor, or a muffler can be installed at the air inlet of the motor fan.
5.2.7.2 Sound absorption treatment can be carried out in the main motor room, and thyristors can be selected to replace relay control systems to eliminate mechanical electromagnetic noise. 6 Supplementary provisions
6.0.1 The noise measurement of industrial enterprise equipment shall be carried out in accordance with GBJ122-88 "Industrial Enterprise Noise Measurement Specifications".
The environmental noise measurement of the chemical plant area shall be carried out in accordance with the relevant provisions of the noise section of the "Environmental Monitoring Technical Specifications" promulgated by the State Environmental Protection Agency. 6.0.3 Regularly calibrate and verify the noise measuring instruments at the national metrology department. The noise at the boundary of a chemical plant should be measured in accordance with GB12348~12349-90 "Noise Standards and Measurement Methods for Industrial Enterprise Boundaries 6.0.4". 32 Appendix A Main noise sources Industrial furnaces Pumps Ball mills Compressors Fans Pipeline systems Cooling towers Gas vents Steam heaters Control room Operation room Laboratory Offices Outside the plant Noise measurement location and height Horizontal location of the measuring point Any direction, 1m from the furnace 1m from the machine Body surface
1m-2m from the body surface
Axial distance of air inlet to the pipe mouth plane
0.5m~1m (or one
pipe mouth diameter)Axial distance of air outlet to the motor western peripheral surface
1m-~2m
0.9m~1.2m
from flange wall
0.7m~1.0m
Select measuring points at 1.5m
around the cooling tower
Select measuring points on the circumference with the height of the torch as the diameter
At the vent and the medium flow direction
at 45 degrees, the distance from the vent shell surface is equal to the vent diameter
1m away from the body surface
Middle of the room
Middle of the room
Middle of the room
Middle of the room
1m away from the wall
3.5m away from the wall outside the factory
Height of measuring point
1.5m from the ground
Same height as the equipment axis, not lower than
0.5m, generally 1.5m
1.5m from the ground
Same height as the equipment axis, from the ground
Same height as the equipment axis, not
lower than 0.5m
Same height as the pipe axis
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
Number of measuring points
More than 3 points1
Hood, etc.
It is advisable to select products with low noise and small vibration. Consider the selection of special equipment for noise control, such as silencers and sound insulation 4.2.3.3
Hydraulic and hydraulic equipment should be used, and stamping and pneumatic equipment should be used less. 5 Noise control of chemical plants and auxiliary facilities 5.1 Noise control of chemical plants and equipment
5.1.1 Plane layout
5.1.1.1 Under the premise of meeting the process flow, high-noise equipment and low-noise equipment should be separated as much as possible. High-noise equipment should be kept away from noise-sensitive places and arranged relatively concentratedly.
5.1.1.2 When arranging equipment, pay attention to the directivity characteristics of noise propagation. Gas vents should be kept away from noise-sensitive areas to avoid noise disturbance. 5.1.1.3 For workshops located at the boundary of the factory area, try to open no or few doors and windows on the outer wall facing the boundary.
5.1.1.4 For knock-open or half-open devices (workshops), it is advisable to install "louver" sound-absorbing panels at the knock-open part, or install sound-absorbing screens opposite the half-open part. 5.1.1.5 Equipment with strong vibration should be arranged on the ground floor as much as possible, and should not be arranged on a platform connected to the floor.
5.1.1.6 When arranging equipment, the space required for the installation, maintenance and operation of the noise control special equipment used with it should be considered. 5.1.1.7 The doors and windows of the operation room and control room in the workshop should be opened in the direction away from the strong noise source.
5.1.2 For high-noise equipment whose noise exceeds the environmental allowable standard, it is best to install it in a room, such as a fan room, air compressor room, pump room, etc. 5.1.3 The main control room should be facing away from and away from the main sound source, but when it must face the sound source for operation and control, measures such as soundproof windows, soundproof doors, and wall sound absorption treatment should be taken. 5.1.4 For exhaust vents exceeding 1.96×10'Pa and motors exceeding 30kW, noise prevention measures should be adopted. Y and YB series low-noise motors can be selected. 5.1.5 Reasonably select and equip various types of valves. The pressure head and displacement of the pump should be operated in the high efficiency area as much as possible to reduce hydraulic noise, while also ensuring that the pressure head is not too high and the displacement is not too large, which would cause the regulating valve to generate high noise. 5.2 Noise control of auxiliary facilities
5.2.1 Noise control in the boiler room
5.2.1.1 The boiler room should place the boiler blower and induced draft fan in the same closed fan room, and the blower should inhale air indoors. The factory should be equipped with an air inlet silencer or silencer. 5.2.1.2 The blower of the self-contained power station boiler should be equipped with inlet and outlet silencers. A vibration isolation flexible pipe should be installed between the air outlet 30
and the pipeline. The induced draft fan can be wrapped with heat insulation, waterproofing and sound insulation
5.2.1.3 The steam pressure reducing device in the boiler room should be placed in a soundproof room, otherwise the pressure reducing valve should be equipped with a soundproof cover.
5.2.1.4 The coal mill in the boiler room can consider using hot rubber lining or sound insulation screen.
5.2.2 Noise control of air compressor station
5.2.2.1 For centrifugal air compressors, a soundproof cover can be used; silencers are installed at the inlet and air supply pipes, and the pipelines should be wrapped with sound insulation layers. Suitable silencers should be selected for exhaust vents. 5.2.2.2 Pit-type or expansion chamber silencers should be used for the air inlet of piston air compressors, and small hole injection silencers should be used for the exhaust port. 5.2.3 Noise control in pump room
5.2.3.1 Install a soundproof enclosure or semi-soundproof enclosure as required. 5.2.3.2 A vibration reduction device should be installed between the base and foundation of the pump, and a flexible rubber joint should be installed between the pump inlet and outlet and the pipeline.
5.2.4 Noise control in machine repair workshop
Vibration reduction measures should be taken between the base and foundation of various impact equipment such as forging hammers and punching machines, and a vibration isolation groove should be set around the foundation to suppress the propagation of vibration waves. A semi-enclosed soundproof enclosure can be installed on the working surface of the forging hammer. A muffler is installed on the exhaust pipe. 5.2.5 Noise control in oxygen production station
5.2.5.1 A soundproof enclosure should be installed for centrifugal air compressors and oxygen compressors, and a soundproof enclosure should also be installed for the motor of the piston oxygen compressor.
5.2.5.2 Small-hole injection silencers should be installed at the outlets for air, argon, etc., and silencers can be installed at the outlets for oxygen:
5.2.5.3 The pressure reducing valve should be installed in a soundproof room, otherwise, a soundproof cover and a soundproof layer should be added to the pressure reducing valve and the front and rear pipes.
5.2.6 Noise control in the fan room
5.2.6.1 The blower and transmission parts should be equipped with full soundproof covers and semi-soundproof covers, which should be well ventilated and easy to disassemble and repair.
5.2.6.2 The air inlet and air supply pipe of the blower must be equipped with silencers, and the air inlet and air supply pipes connected to the blower should be set in a closed structure or wrapped with a soundproof layer. 5.2..3 Suitable mufflers should be installed at the vents of the blowers. 3.2.7 Noise control in the main motor room
5.2.7.1 A semi-soundproof cover can be installed on the motor, or a muffler can be installed at the air inlet of the motor fan.
5.2.7.2 Sound absorption treatment can be carried out in the main motor room, and thyristors can be selected to replace relay control systems to eliminate mechanical electromagnetic noise. 6 Supplementary provisions
6.0.1 The noise measurement of industrial enterprise equipment shall be carried out in accordance with GBJ122-88 "Industrial Enterprise Noise Measurement Specifications".
The environmental noise measurement of the chemical plant area shall be carried out in accordance with the relevant provisions of the noise section of the "Environmental Monitoring Technical Specifications" promulgated by the State Environmental Protection Agency. 6.0.3 Regularly calibrate and verify the noise measuring instruments at the national metrology department. The noise at the boundary of a chemical plant should be measured in accordance with GB12348~12349-90 "Noise Standards and Measurement Methods for Industrial Enterprise Boundaries 6.0.4". 32 Appendix A Main noise sources Industrial furnaces Pumps Ball mills Compressors Fans Pipeline systems Cooling towers Gas vents Steam heaters Control room Operation room Laboratory Offices Outside the plant Noise measurement location and height Horizontal location of the measuring point Any direction, 1m from the furnace 1m from the machine Body surface
1m-2m from the body surface
Axial distance of air inlet to the pipe mouth plane
0.5m~1m (or one
pipe mouth diameter)Axial distance of air outlet to the motor western peripheral surface
1m-~2m
0.9m~1.2m from flange wall
0.7m~1.0m from pipe outer wall
Select measuring points at 1.5m
around the cooling tower
Select measuring points on the circumference with the height of the torch as the diameter
At the vent and the medium flow direction
at 45 degrees, the distance from the vent shell surface is equal to the vent diameter
1m away from the body surface
Middle of the room
Middle of the room
Middle of the room
Middle of the room
1m away from the wall
3.5m away from the wall outside the factory
Height of measuring point
1.5m from the ground
Same height as the equipment axis, not lower than
0.5m, generally 1.5m
1.5m from the ground
Same height as the equipment axis, from the ground
Same height as the equipment axis, not
lower than 0.5m
Same height as the pipe axis
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
Number of measuring points
More than 3 points4 For knock-open or half-open devices (workshops), it is advisable to install "louver" sound-absorbing panels at the knock-open part, or install sound-absorbing screens opposite the half-open part. 5.1.1.5 Equipment with strong vibration should be arranged on the ground floor as much as possible, and should not be arranged on a platform connected to the floor.
5.1.1.6 When arranging equipment, the space required for the installation, maintenance and operation of the noise control special equipment used with it should be considered. 5.1.1.7 The doors and windows of the operation room and control room in the workshop should be opened in the direction away from the strong noise source.
5.1.2 For high-noise equipment whose noise exceeds the environmental allowable standard, it is best to install it in the room, such as setting up a fan room, air compressor room, pump room, etc. 5.1.3 The main control room should be facing away from and away from the main sound source, but when it must face the sound source for operation and control, measures such as soundproof windows, soundproof doors, and wall sound absorption treatment should be taken. 5.1.4 For exhaust vents exceeding 1.96×10'Pa and motors exceeding 30kW, noise prevention measures should be adopted. Y and YB series low-noise motors can be used. 5.1.5 Reasonably select and equip various types of valves. The pressure head and displacement of the pump should be operated in the high efficiency area as much as possible to reduce hydraulic noise, while also ensuring that the pressure head is not too high and the displacement is not too large, which would cause the regulating valve to generate high noise. 5.2 Noise control of auxiliary facilities
5.2.1 Noise control in the boiler room
5.2.1.1 The boiler room should place the boiler blower and induced draft fan in the same closed fan room, with the blower sucking air indoors, and the factory building should be equipped with an air inlet silencer or silencer. 5.2.1.2 The blower of the boiler in the self-contained power station should be equipped with inlet and outlet silencers. A vibration isolation flexible pipe should be installed between the air outlet 30
and the pipeline. The induced draft fan can be wrapped with heat insulation, waterproofing and sound insulation
5.2.1.3 The steam pressure reducing device in the boiler room should be placed in a soundproof room, otherwise the pressure reducing valve should be equipped with a soundproof cover.
5.2.1.4 The coal mill in the boiler room can consider using hot rubber lining or sound insulation screen.
5.2.2 Noise control of air compressor station
5.2.2.1 For centrifugal air compressors, a soundproof cover can be used; silencers are installed at the inlet and air supply pipes, and the pipelines should be wrapped with sound insulation layers. Suitable silencers should be selected for exhaust vents. 5.2.2.2 Pit-type or expansion chamber silencers should be used for the air inlet of piston air compressors, and small hole injection silencers should be used for the exhaust port. 5.2.3 Noise control in pump room
5.2.3.1 Install a soundproof enclosure or semi-soundproof enclosure as required. 5.2.3.2 A vibration reduction device should be installed between the base and foundation of the pump, and a flexible rubber joint should be installed between the pump inlet and outlet and the pipeline.
5.2.4 Noise control in machine repair workshop
Vibration reduction measures should be taken between the base and foundation of various impact equipment such as forging hammers and punching machines, and a vibration isolation groove should be set around the foundation to suppress the propagation of vibration waves. A semi-enclosed soundproof enclosure can be installed on the working surface of the forging hammer. A muffler is installed on the exhaust pipe. 5.2.5 Noise control in oxygen production station
5.2.5.1 A soundproof enclosure should be installed for centrifugal air compressors and oxygen compressors, and a soundproof enclosure should also be installed for the motor of the piston oxygen compressor.
5.2.5.2 Small-hole injection silencers should be installed at the outlets for air, argon, etc., and silencers can be installed at the outlets for oxygen:
5.2.5.3 The pressure reducing valve should be installed in a soundproof room, otherwise a soundproof cover and sound insulation layer should be added to the pressure reducing valve and the front and rear pipes.
5.2.6 Noise control in the fan room
5.2.6.1 The blower and transmission parts should be equipped with full soundproof covers and semi-soundproof covers, which should be well ventilated and easy to disassemble and repair.
5.2.6.2 The air inlet and air supply pipe of the blower must be equipped with silencers, and the air inlet and air supply pipes connected to the blower should be set in a closed structure or wrapped with a sound insulation layer. 5.2..3 Suitable silencers should be installed at the vents of the blowers. 3.2.7 Noise control in the main motor room
5.2.7.1 A semi-soundproof cover can be installed on the motor, or a silencer can be installed at the air inlet of the motor fan.
5.2.7.2 Sound absorption treatment can be carried out in the main motor room, and thyristors can be selected to replace relay control systems to eliminate mechanical electromagnetic noise. 6 Supplementary provisions
6.0.1 The noise measurement of industrial enterprise equipment shall be carried out in accordance with GBJ122-88 "Industrial Enterprise Noise Measurement Specifications".
The environmental noise measurement of the chemical plant area shall be carried out in accordance with the relevant provisions of the noise section of the "Environmental Monitoring Technical Specifications" promulgated by the State Environmental Protection Agency. 6.0.3 Regularly calibrate and verify the noise measuring instruments at the national metrology department. The noise at the boundary of a chemical plant should be measured in accordance with GB12348~12349-90 "Noise Standards and Measurement Methods for Industrial Enterprise Boundaries 6.0.4". 32 Appendix A Main noise sources Industrial furnaces Pumps Ball mills Compressors Fans Pipeline systems Cooling towers Gas vents Steam heaters Control room Operation room Laboratory Offices Outside the plant Noise measurement position and height Horizontal position of the measuring point Any direction, 1m from the furnace Body surface
1m-2m from the body surface
Axial distance of air inlet to the pipe mouth plane
0.5m~1m (or one
pipe mouth diameter)Axial distance of air outlet to the motor western peripheral surface
1m-~2m
0.9m~1.2m from flange wall
0.7m~1.0m from pipe outer wall
Select measuring points at 1.5m
around the cooling tower
Select measuring points on the circumference with the height of the torch as the diameter
At the vent and the medium flow direction
at 45 degrees, the distance from the vent shell surface is equal to the vent diameter
1m away from the body surface
Middle of the room
Middle of the room
Middle of the room
Middle of the room
1m away from the wall
3.5m away from the wall outside the factory
Height of measuring point
1.5m from the ground
Same height as the equipment axis, not lower than
0.5m, generally 1.5m
1.5m from the ground
Same height as the equipment axis, from the ground
Same height as the equipment axis, not
lower than 0.5m
Same height as the pipe axis
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
Number of measuring points
More than 3 points4 For knock-open or half-open devices (workshops), it is advisable to install "louver" sound-absorbing panels at the knock-open part, or install sound-absorbing screens opposite the half-open part. 5.1.1.5 Equipment with strong vibration should be arranged on the ground floor as much as possible, and should not be arranged on a platform connected to the floor.
5.1.1.6 When arranging equipment, the space required for the installation, maintenance and operation of the noise control special equipment used with it should be considered. 5.1.1.7 The doors and windows of the operation room and control room in the workshop should be opened in the direction away from the strong noise source.
5.1.2 For high-noise equipment whose noise exceeds the environmental allowable standard, it is best to install it in the room, such as setting up a fan room, air compressor room, pump room, etc. 5.1.3 The main control room should be facing away from and away from the main sound source, but when it must face the sound source for operation and control, measures such as soundproof windows, soundproof doors, and wall sound absorption treatment should be taken. 5.1.4 For exhaust vents exceeding 1.96×10'Pa and motors exceeding 30kW, noise prevention measures should be adopted. Y and YB series low-noise motors can be used. 5.1.5 Reasonably select and equip various types of valves. The pressure head and displacement of the pump should be operated in the high efficiency area as much as possible to reduce hydraulic noise, while also ensuring that the pressure head is not too high and the displacement is not too large, which would cause the regulating valve to generate high noise. 5.2 Noise control of auxiliary facilities
5.2.1 Noise control in the boiler room
5.2.1.1 The boiler room should place the boiler blower and induced draft fan in the same closed fan room, with the blower sucking air indoors, and the factory building should be equipped with an air inlet silencer or silencer. 5.2.1.2 The blower of the boiler in the self-contained power station should be equipped with inlet and outlet silencers. A vibration isolation flexible pipe should be installed between the air outlet 30
and the pipeline. The induced draft fan can be wrapped with heat insulation, waterproofing and sound insulation
5.2.1.3 The steam pressure reducing device in the boiler room should be placed in a soundproof room, otherwise the pressure reducing valve should be equipped with a soundproof cover.
5.2.1.4 The coal mill in the boiler room can consider using hot rubber lining or sound insulation screen.
5.2.2 Noise control of air compressor station
5.2.2.1 For centrifugal air compressors, a soundproof cover can be used; silencers are installed at the inlet and air supply pipes, and the pipelines should be wrapped with sound insulation layers. Suitable silencers should be selected for exhaust vents. 5.2.2.2 Pit-type or expansion chamber silencers should be used for the air inlet of piston air compressors, and small hole injection silencers should be used for the exhaust port. 5.2.3 Noise control in pump room
5.2.3.1 Install a soundproof enclosure or semi-soundproof enclosure as required. 5.2.3.2 A vibration reduction device should be installed between the base and foundation of the pump, and a flexible rubber joint should be installed between the pump inlet and outlet and the pipeline.
5.2.4 Noise control in machine repair workshop
Vibration reduction measures should be taken between the base and foundation of various impact equipment such as forging hammers and punching machines, and a vibration isolation groove should be set around the foundation to suppress the propagation of vibration waves. A semi-enclosed soundproof enclosure can be installed on the working surface of the forging hammer. A muffler is installed on the exhaust pipe. 5.2.5 Noise control in oxygen production station
5.2.5.1 A soundproof enclosure should be installed for centrifugal air compressors and oxygen compressors, and a soundproof enclosure should also be installed for the motor of the piston oxygen compressor.
5.2.5.2 Small-hole injection silencers should be installed at the outlets for air, argon, etc., and silencers can be installed at the outlets for oxygen:
5.2.5.3 The pressure reducing valve should be installed in a soundproof room, otherwise a soundproof cover and sound insulation layer should be added to the pressure reducing valve and the front and rear pipes.
5.2.6 Noise control in the fan room
5.2.6.1 The blower and transmission parts should be equipped with full soundproof covers and semi-soundproof covers, which should be well ventilated and easy to disassemble and repair.
5.2.6.2 The air inlet and air supply pipe of the blower must be equipped with silencers, and the air inlet and air supply pipes connected to the blower should be set in a closed structure or wrapped with a sound insulation layer. 5.2..3 Suitable silencers should be installed at the vents of the blowers. 3.2.7 Noise control in the main motor room
5.2.7.1 A semi-soundproof cover can be installed on the motor, or a silencer can be installed at the air inlet of the motor fan.
5.2.7.2 Sound absorption treatment can be carried out in the main motor room, and thyristors can be selected to replace relay control systems to eliminate mechanical electromagnetic noise. 6 Supplementary provisions
6.0.1 The noise measurement of industrial enterprise equipment shall be carried out in accordance with GBJ122-88 "Industrial Enterprise Noise Measurement Specifications".
The environmental noise measurement of the chemical plant area shall be carried out in accordance with the relevant provisions of the noise section of the "Environmental Monitoring Technical Specifications" promulgated by the State Environmental Protection Agency. 6.0.3 Regularly calibrate and verify the noise measuring instruments at the national metrology department. The noise at the boundary of a chemical plant should be measured in accordance with GB12348~12349-90 "Noise Standards and Measurement Methods for Industrial Enterprise Boundaries 6.0.4". 32 Appendix A Main noise sources Industrial furnaces Pumps Ball mills Compressors Fans Pipeline systems Cooling towers Gas vents Steam heaters Control room Operation room Laboratory Offices Outside the plant Noise measurement position and height Horizontal position of the measuring point Any direction, 1m from the furnace Body surface
1m-2m from the body surface
Axial distance of air inlet to the pipe mouth plane
0.5m~1m (or one
pipe mouth diameter)Axial distance of air outlet to the motor western peripheral surface
1m-~2m
0.9m~1.2m from flange wall
0.7m~1.0m from pipe outer wall
Select measuring points at 1.5m
around the cooling tower
Select measuring points on the circumference with the height of the torch as the diameter
At the vent and the medium flow direction
at 45 degrees, the distance from the vent shell surface is equal to the vent diameter
1m away from the body surface
Middle of the room
Middle of the room
Middle of the room
Middle of the room
1m away from the wall
3.5m away from the wall outside the factory
Height of measuring point
1.5m from the ground
Same height as the equipment axis, not lower than
0.5m, generally 1.5m
1.5m from the ground
Same height as the equipment axis, from the ground
Same height as the equipment axis, not
lower than 0.5m
Same height as the pipe axis
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
Number of measuring points
More than 3 points4 For the coal mill in the boiler room, thermal rubber lining or soundproof screen may be considered.
5.2.2 Noise control of air compressor station
5.2.2.1 For centrifugal air compressor, a soundproof cover may be used; silencers shall be installed at the inlet and air supply pipes, and the pipes shall be wrapped with sound insulation layers. Suitable silencers shall be selected for the exhaust vent. 5.2.2.2 For the air inlet of piston air compressor, pit-type or expansion chamber silencers shall be used, and small-hole injection silencers shall be used for the exhaust port. 5.2.3 Noise control in pump room
5.2.3.1 Soundproof cover or semi-soundproof cover shall be installed as required. 5.2.3.2 Vibration reduction device shall be installed between the base and foundation of the pump, and flexible rubber joints shall be installed between the pump inlet and outlet and the pipeline.
5.2.4 Noise control in machine repair workshop
Vibration reduction measures should be taken between the base and foundation of various impact equipment such as forging hammers and punching machines, and vibration isolation trenches should be set around the foundation to suppress the propagation of vibration waves. A semi-enclosed soundproof cover can be installed on the working surface of the forging hammer. A muffler is installed on the exhaust pipe. 5.2.5 Noise control in oxygen production station
5.2.5.1 Centrifugal air compressors and oxygen compressors should be equipped with soundproof covers, and the motors of piston oxygen compressors should also be equipped with soundproof covers.
5.2.5.2 Small-hole injection mufflers should be installed at the discharge ports of air, argon, etc., and mufflers can be installed at the discharge ports of oxygen:
5.2.5.3 The pressure reducing valve should be installed in a soundproof room, otherwise a soundproof cover and a sound insulation layer should be added to the pressure reducing valve and the front and rear pipes.
5.2.6 Noise control in the fan room
5.2.6.1 The blower and transmission parts shall be equipped with full soundproof enclosures and semi-soundproof enclosures, which shall be well ventilated and easy to disassemble and repair.
5.2.6.2 The air inlet and air supply pipe of the blower shall be equipped with mufflers, and the air inlet and air supply pipes connected to the blower shall be set in a closed structure or wrapped with a sound insulation layer. 5.2..3 The air outlet of the blower shall be equipped with a suitable muffler. 3.2.7 Noise control in the main motor room
5.2.7.1 A semi-soundproof enclosure may be installed on the motor, or a muffler may be installed at the air inlet of the motor fan.
5.2.7.2 Sound absorption treatment may be carried out in the main motor room, and thyristors may be selected to replace the relay control system to eliminate mechanical electromagnetic noise. 6 Supplementary Provisions
6.0.1 The noise measurement of industrial equipment shall be carried out in accordance with GBJ122-88 "Noise Measurement Specifications for Industrial Enterprises".
The environmental noise measurement of chemical plant areas shall be carried out in accordance with the relevant provisions of the noise section of "Environmental Monitoring Technical Specifications" promulgated by the State Environmental Protection Agency. 6.0.3 The noise measuring instruments shall be calibrated and verified regularly at the national metrology department. The noise at the boundary of chemical plants shall be measured in accordance with GB12348~12349-90 "Noise Standards and Measurement Methods at the Boundary of Industrial Enterprises". 32
Appendix A
Main noise sources
Industrial furnaces
Pumps
Ball mills
Compressors and fans
Pipeline systems
Cooling towers
Gas vents
Steam heaters
Control room
Operation room
Laboratory
Office
Out-of-plant environment
Noise measurement position and height
Horizontal position of measuring points
Any direction, 1m from the furnace
From the machine Body surface
1m-2m from the body surface
Axial distance of air inlet to the pipe mouth plane
0.5m~1m (or one
pipe mouth diameter)Axial distance of air outlet to the motor western peripheral surface
1m-~2m
0.9m~1.2m
from flange wall
0.7m~1.0m
Select measuring points at 1.5m
around the cooling tower
Select measuring points on the circumference with the height of the torch as the diameter
At the vent and the medium flow direction
at 45 degrees, the distance from the vent shell surface is equal to the vent diameter
1m away from the body surface
Middle of the room
Middle of the room
Middle of the room
Middle of the room
1m away from the wall
3.5m away from the wall outside the factory
Height of measuring point
1.5m from the ground
Same height as the equipment axis, not lower than
0.5m, generally 1.5m
1.5m from the ground
Same height as the equipment axis, from the ground
Same height as the equipment axis, not
lower than 0.5m
Same height as the pipe axis
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
1.5m from the ground
Number of measuring points
More than 3 points4 For the coal mill in the boiler room, thermal rubber lining or soundproof screen may be considered.
5.2.2 Noise control of air compressor station
5.2.2.1 For centrifugal air compressor, a soundproof cover may be used; silencers shall be installed at the inlet and air supply pipes, and the pipes shall be wrapped with sound insulation layers. Suitable silencers shall be selected for the exhaust vent. 5.2.2.2 For the air inlet of piston air compressor, pit-type or expansion chamber silencers shall be used, and small-hole injection silencers shall be used for the exhaust port. 5.2.3 Noise control in pump room
5.2.3.1 Soundproof cover or semi-soundproof cover shall be installed as required. 5.2.3.2 Vibration reduction device shall be installed between the base and foundation of the pump, and flexible rubber joints shall be installed between the pump inlet and outlet and the pipeline.
5.2.4 Noise control in machine repair workshop
Vibration reduction measures should be taken between the base and foundation of various impact equipment such as forging hammers and punching machines, and vibration isolation trenches should be set around the foundation to suppress the propagation of vibration waves. A semi-enclosed soundproof cover can be installed on the working surface of the forging hammer. A muffler is installed on the exhaust pipe. 5.2.5 Noise control in oxygen production station
5.2.5.1 Centrifugal air compressors and oxygen compressors should be equipped with soundproof covers, and the motors of piston oxygen compressors should also be equipped with soundproof covers.
5.2.5.2 Small-hole injection mufflers should be installed at the discharge ports of air, argon, etc., and mufflers can be installed at the discharge ports of oxygen:
5.2.5.3 The pressure reducing valve should be installed in a soundproof room, otherwise a soundproof cover and a sound insulation layer should be added to the pressure reducing valve and the front and rear pipes.
5.2.6 Noise control in the fan room
5.2.6.1 The blower and transmission parts shall be equipped with full soundproof enclosures and semi-soundproof enclosures, which shall be well ventilated and easy to disassemble and repair.
5.2.6.2 The air inlet and air supply pipe of the blower shall be equipped with mufflers, and the air inlet and air supply pipes connected to the blower shall be set in a closed structure or wrapped with a sound insulation layer. 5.2..3 The air outlet of the blower shall be equipped with a suitable muffler. 3.2.7 Noise control in the main motor room
5.2.7.1 A semi-soundproof enclosure may be installed on the motor, or a muffler may be installed at the air inlet of the motor fan.
5.2.7.2 Sound absorption treatment may be carried out in the main motor room, and thyristors may be selected to replace the relay control system to eliminate mechanical electromagnetic noise. 6 Supplementary Provisions
6.0.1 The noise measurement of industrial equipment shall be carried out in accordance with GBJ122-88 "Noise Measurement Specifications for Industrial Enterprises".
The environmental noise measurement of chemical plant areas shall be carried out in accordance with the relevant provisions of the noise section of "Environmental Monitoring Technical Specifications" promulgated by the State Environmental Protection Agency. 6.0.3 The noise measuring instruments shall be calibrated and verified regularly at the national metrology department. The noise at the boundary of chemical plants shall be measured in accordance with GB12348~12349-90 "Noise Standards and Measurement Methods at the Boundary of Industrial Enterprises". 32
Appendix A
Main noise sources
Industrial furnaces
Pumps
Ball mills
Compressors and fans
Pipeline systems
Cooling towers
Gas vents
Steam heaters
Control room
Operation room
Laboratory
Office
Out-of-plant environment
Noise measurement position and height
Horizontal position of measuring points
Any direction, 1m from the furnace
From the machine Body surface
1m-2m from the body surface
Axial distance of air inlet to the pipe mouth plane
0.5m~1m (or one
pipe mouth diameter)Axial distance of air outlet to the motor western peripheral surface
1m-~2m
0.9m~1.2m
from flange wall
0.7m~1.0m
Select measuring points at 1.5m
around the cooling towerWww.bzxZ.net
Select measuring points on the circumference with the height of the torch as the diameter
At the vent and the medium flow direction
at 45 degrees, the distance from the vent shell surface is equal to the vent diameter
1m away from the body surface
Middle of the room
Middle of the room
Middle of the room
Middle of the room
1m away from the wall
3.5m away from the wall outside the factory
Height of measuring point
1.5m from the ground
Same height as the equipment axis, not lower than
0.5m, generally 1.5m
1.5m from the ground
Same height as the equipment axis, from the ground
Same height as the equipment axis, not
lower than 0.5m
Same height as the pipe axis
1.5m from the ground
1.5m from the ground
1.5m from the
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