JB/T 4357-1999 This standard is a revision of JB 4357-86 "Centrifugal induced draft fan for industrial steam boilers". At the investigation site, the design life requirements of the main bearings were increased; the requirements for the materials of rotating parts were specified; the products were required to pass the type test before they could be put into production. This standard specifies the basic design requirements, testing and acceptance, complete set supply and guarantee, marking, packaging and transportation of centrifugal induced draft fans for industrial steam boilers. This standard applies to centrifugal induced draft fans for industrial steam boilers with a production capacity of 1~20t/h. The inlet of the induced draft fan should be equipped with a dust removal device. The inlet flue gas temperature of the induced draft fan should be greater than 165°C and less than 250°C, and the dust content of the flue gas should not be greater than 400mmg/m3. This standard does not apply to boiler induced draft fans used in power stations. This standard was first published on the year, month and day. JB/T 4357-1999 Centrifugal induced draft fan for industrial steam boilers JB/T4357-1999 Standard download and decompression password: www.bzxz.net

JB/T 4357-1999
Foreword
This standard is a revision of JB4357-86 "Centrifugal induced draft fan for industrial steam boilers". Editorial changes were made to the original standard during the revision. Compared with JB4357-86, the main technical content of this standard has changed as follows: "3.6 The design life of the main bearing of the induced draft fan shall not be less than 50000h" has been added; in the raw material "materials of rotating parts and certificates of conformity of purchased parts must be kept" "." is added after "storage period is 5 years", which is more specific than the original standard.
Added "Lane 4.11
The newly developed ventilator prototype type test must pass the inspection by a state-authorized quality inspection agency before it can be identified and put into production."
Added "6.3 Induced draft fans exported abroad shall be implemented in accordance with the relevant provisions of the contract between the supplier and the buyer." This standard is recommended to replace JB4357-86 from the date of implementation. This standard is proposed and coordinated by the National Fan Standardization Technical Committee. This standard was drafted by: Shenyang Blower Factory. The main drafters of this standard: Peng Xiuman and Zhao Zhentai. 309

Scope
Mechanical Industry Standard of the People's Republic of China
Centrifugal induced draft fan for industrial steam boiler
Centrifugal ID-FAN for industry steam boilerJB/T 4357 - - 1999
Replaces JB4357-86
This standard specifies the basic design requirements, testing and acceptance, complete set supply and guarantee, marking, packaging and transportation of centrifugal induced draft fans for industrial steam boilers.
This standard applies to centrifugal induced draft fans (referred to as induced draft fans) for industrial steam boilers with a production capacity of 1 to 201/h. The inlet of the induced draft fan should be equipped with a dust removal device. The inlet flue gas temperature of the induced draft fan should be greater than 165C and less than 250C, and the dust content of the flue gas should not be greater than 400mg/m\.
This standard does not apply to boiler induced draft fans used in power stations. 2
Quoted standards
The provisions contained in the following citations constitute provisions of this standard through reference in this standard. At the time of publication, the editions indicated were valid. All standards will be revised. Parties using this subject matter should explore the possibility of using the latest versions of the following standards. Test method for aerodynamic performance of fans
GB/T 1236--- 1985bZxz.net
GB/T 2888---1991
Measurement method for noise of fans and Roots blowers GB/T 3235 - -1999
Basic types, dimensional parameters and performance curves of ventilators GB/T 13306- -1991
JB/T6444—1992
JB/T 6445--1992||tt ||JB/T 8689--1998
JB/T 8690--1998
JB/T 9101—1999
Basic design requirements
3||tt| |Label
General technical conditions for fan packaging
Ventictor impeller overspeed test
Ventilator vibration detection and its limits
Industrial fan noise limits||tt| |Ventictor rotor balance
3.1 The induced draft fan shall comply with the provisions of this standard and the contract between the supplier and the buyer. 3.2 The effects of wear on the casing and impeller of the induced draft fan should be considered. The service life of the impeller should be guaranteed to be at least 8000h. 3.3 The critical speed of the main shaft (rigidity) of the induced draft fan should be greater than 1.3 times the maximum operating speed of the induced draft fan. 3.4 The properties of materials used in induced draft fans should comply with national standards and relevant standards of the Ministry of Metallurgy. Special requirements can be stipulated in the contract between the supplier and the buyer.
3.5 Unless otherwise agreed, the induced draft fan shall comply with the regulations of GB/T3235. 3.6 The design life of the main bearing of the induced draft fan shall not be less than 50,000. 4 Testing and acceptance
4.1 The welding parts of the induced draft fan must be welded by welders who have passed the welder qualification examination. Approved by the State Machinery Industry Bureau on July 12, 1999 310| |tt||Implemented on 2000-01-01
JB/T4357-1999
4.2 The balance test of the fan impeller or rotor must comply with the requirements of JB/T9101. 4.3 The overspeed test of the impeller must comply with the requirements of JB/T6445. The number of overspeed test units is: For induced draft fans of the same type and machine number, for those whose machine number is less than or equal to N6.3, one unit shall be randomly tested in each batch of 20 units (if the number is less than 20 units, it will also be counted as 20 units): For those with machine numbers greater than N96.3 to N912.5, one unit should be randomly tested for each batch of 10 units (less than 10 units are also counted as 10 units); for those with machine numbers greater than N12.5, each unit should be subject to an overspeed test.
4.4 The induced draft fan must undergo no-load or load mechanical operation test before leaving the factory. The continuous operation time shall not be less than 20 minutes after the bearing temperature stabilizes (the bearing temperature is measured on the bearing box). When the ambient temperature is between 0 and 40°C, the bearing temperature rise shall not exceed the ambient temperature by 40°C. When the ambient temperature is below 0C, it should be stipulated in the contract by both parties. The root mean square vibration speed value of the bearing part is in accordance with the provisions of JB/T8689. 4.4.1 The number of units for the mechanical operation test is: for induced draft fans of the same type and machine number, for those with machine numbers less than or equal to N96.3, one unit should be randomly tested for each batch of 20 units (if the number is less than 20 units, it will also be counted as 20 units) Calculation); for those with machine numbers greater than N6.3 to N12.5, one unit should be randomly tested for each batch of 10 units (if the machine number is less than 10 units, it will also be calculated as 10 units). For those with machine numbers greater than N12.5, each unit should undergo a factory mechanical operation test. 4.4.2 If the induced draft fan tested exceeds the specified value, a second unit should be tested. If it still exceeds the specified value, the batch of induced draft fans should be tested one by one.
4.5 The aerodynamic performance test of the induced draft fan shall be carried out in accordance with GB/T1236. 4.5.1 The development of a new series of induced draft fans must measure the pressure, flow, power, and efficiency of the model and two or more typical prototypes within the peripheral speed range specified by the series, and provide a complete performance curve (including noise characteristics) Make an identification. 4.5.2 Induced draft fan aerodynamic performance test, at a given speed and within the working section, the limit deviation between the actual aerodynamic performance curve and the given curve is: the measured total pressure value or static pressure value of the induced draft fan shall not exceed Rating is 5%. The efficiency value shall not be less than 5% of the corresponding efficiency point of the given performance curve.
4.5.3 Aerodynamic performance test of induced draft fans of the same type and machine number. For those with machine number smaller than N16, one unit shall be tested per year. If the test results are out of tolerance, the cause should be found, repairs should be carried out, and then the test should be doubled. If it is still out of tolerance, the batch of products should be tested one by one. Citation for machine number greater than or equal to N16! Aerodynamic performance testing of fans. It can be carried out according to the agreement between the supply and demand parties. 4.6 The noise of new products should be measured according to GB/T2888, and the spectrum curve should be drawn. Its A sound level should comply with the regulations of JB/T8690. For new products with machine numbers greater than or equal to N916, if the noise is measured unconditionally according to the provisions of GB/T2888, it can be handled according to the agreement between the supplier and the buyer.
The induced draft fan test items specified in 4.7 must have complete test reports or records, and the certificates of conformity of the materials of rotating parts and purchased parts must be kept for a period of 5 years. If the user needs to provide inspection results, it can be agreed upon by both parties. 4.8 Each fan must pass the inspection by the technical inspection department of the manufacturer and be accompanied by a product certificate before it can leave the factory. 4.9 The random technical documents and complete set of supply equipment of each induced draft fan shall be checked and accepted by the technical inspection department of the manufacturer according to the detailed list. 4.10 The purchaser can supervise the production of the induced draft fan and participate in part or all of the test and acceptance of the induced draft fan. The date of the test and acceptance project to be participated by the buyer and related economic matters are stipulated in the contract between the supplier and the buyer. 4.11 The newly developed ventilator prototype must pass the type test by a state-authorized quality inspection agency before it can be identified and put into production. 5 Complete set supply and guarantee
5.1 The supplier shall guarantee the performance limit deviation specified in 4.5.2. 5.2 The scope of supply of complete sets of induced draft fans and the items and quantities of spare parts shall be stipulated in the contract by both parties. 5.3 Under the condition that the purchaser complies with the regulations on the storage, use, installation, and transportation of the induced draft fan, the supplier guarantees that the total operating time of the induced draft fan shall not be less than 8000 hours, and the warranty period shall not exceed 18 months from the date of shipment. 5.4 During the warranty period, if the induced draft fan is damaged or fails to work properly due to manufacturing quality problems, the supplier shall repair or replace parts for the demander free of charge.
6 Marking, Packaging and Transportation
6.1 Mark
311
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JB/T4357-1999
6.1.1. The induced draft fan should have a sign in a conspicuous position, and its content should include: name, model, performance, maximum operating temperature, product number, manufacturing date and manufacturer, etc.
6.1.2 The direction of rotation and adjustment position of the rotor should be marked on the induced draft fan or parts. 6.1.3 The size and technical requirements of the induced draft fan sign shall comply with the provisions of GB/T13306. 6.2 Packaging and transportation
6.2.1 The induced draft fan should be packed according to the number, item and number of pieces specified in the packing list. The packaging box should comply with the regulations of JB/T6444. 6.2.2 The induced draft fan is allowed to be simply packaged, but the motor, bearings and couplings should be waterproof, moisture-proof, and vibration-proof. 6.2.3 The non-processed surfaces of the induced draft fan parts should be coated with paint, and the exposed parts of the other parts should be Both the unpainted and unpainted processing surfaces need to be coated with an anti-rust layer, and appropriate protective covers are added when necessary.
6.2.4 Random documents should be placed in moisture-proof packaging bags. 6.2.5 The design of the packaging box should comply with relevant transportation regulations. 6.3 Induced draft fans exported to foreign countries shall be subject to the relevant provisions of the contract between the supplier and the buyer. 312
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