JB/T 8690-1998 JB/T 8690-1998 Noise Limits for Industrial Fans JB/T8690-1998 Standard download decompression password: www.bzxz.net

JB/T8690
This standard is proposed and managed by the National Technical Committee for Standardization of Fans. The drafting unit of this standard is Shenyang Blower Research Institute. The main drafters of this standard are Chen Mingliang, Peng Xiuman and Jiang Yunzhu.
Mechanical Industry Standard of the People's Republic of China
Industrial Fans
Noise Limit
Industrial Fans Noise Limited Value This standard applies to general centrifugal and axial flow fans. JB/T 8690--1998
This standard does not apply to roof, vortex, special high pressure and other types of fans and fans with special requirements for noise. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2888--91 Noise measurement method for fans and Roots blowers 3 Fan noise measurement and noise limit
3.1 The measurement conditions, equipment and methods of fan noise shall be implemented in accordance with GB/T2888. 3.2
The specific A sound level LsA limit of various types of fan noise at the best efficiency operating point shall comply with the provisions of Table 1. Table 1
Fan type
Forward blade centrifugal fan
Backward plate blade centrifugal fan
Wing blade centrifugal fan
Radial blade centrifugal fan
Axial flow fan
Specific A sound level LsA
Note: If the requirements of Table 1 cannot be met or there are special requirements for noise, it should be stipulated in the contract between the buyer and the seller. 3.3 The calculation formula of the specific A sound level of the fan noise at the test operating point is: LsA = LA - 10 1g (Qp2) + 19. 8
Wherein: LsA-bzxZ.net
Specific A sound level of the fan inlet (or outlet), dB; A sound level of the fan inlet (or outlet), dB (A); Flow rate of the fan at the test operating point, m/min; Total pressure of the fan at the test operating point, Pa.
Approved by the Ministry of Machinery Industry of the People's Republic of China on March 19, 1998 352
Measurement location
According to GB/T2888
Implementation on July 1, 1998
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