【正文】 ment of bearing temperature rise and vibration should meet the following provisions:a) Temperature of bearing measured on the surface of bearing may not be 40℃ higher than ambient temperature。b) Requirements of the amplitude and frequency of the foundation of the fan. Exposed coupler or belt wheel should have no demountable protective device。 it should be coaxial with impeller. Face of flange in inlet and outlet should be smooth. The flange face should be parallel or vertical to axis. Flatness allowance of flange should meet the provisions of JB/T10214. should be in the lower part of enclosure of the fan with machine No. Being less than supporting foot. There should be at least four basic installation openings in each fan. The enclosure may be manufactured in two parts if machine No. is more than No 。 the center of the enclosure should be coaxial with bearing if the fan is not drive type. Pipeline connected to inlet and outlet of the enclosure should be independently supported。 the specification and size of the bearing should meet the provisions of related standards. Thrust bearing that can bear additional thrust produced by fan. The match of rolling bearing and shaft and housing should meet the provisions of GB/T 275. The bearing should be firmly assembled in bearing box。 list the chemical position, mechanical performance and test requirements if there is no standard for the materials used. Materials for rotating parts should pass physical and chemical test, and have test report with them, and be free from fissures. The fissures may be repaired If parts do not receive live load and the intensity is ensured. However, the repaired parts must be clean and balanced. Manufacturing Requirements of cast Quality of cast iron should meet the provisions of JB/T 6887. Quality of cast steel should meet the provisions of JB/T 6888. Welding requirements Welding quality should ply with the provisions of JB/T 10213. Electric welder of the fan can not weld rotating parts without passing the welding test. The appearance test should be conducted for weld joint after the rotating parts are welded。 axial overlapping length should be % to % of the diameter of impeller. The centre opening of the enclosure of the low and mediumpressure fan should be coaxial with the axle. The gap between the diameter of centre opening and axial diameter should meet the following provisions, but the minimum gap should be no less than .a) No more than 4mm if the machine No. is between and 。b) Motor。f) Protective device (with an exception of direct drive centrifugal fan)。j) Instruction manual of fan. The supplier may provide air director or other adjustment device based on the demand of the buyer if machine No. Is and more. The supplier may provide noise elimination device, monitoring instrument, etc based on demand of the buyer. Installation The supplier shall be responsible for installation of the fan. The supplier shall send experienced technicians to offer installation and startup service if necessary. The supplier shall provide documents related to installation requirements if necessary:a) The estimated weight of the fan when the assembled fan is to be transported。e) Installation Diagram or Assembly Diagram, welding specifications, scope of field work, installation clearance, operation and maintenance manuals。 its vibration should be tested according to the provisions of JB/T8689. Balance correction of impeller (or rotor) and belt wheel should be conducted according to the provisions of JB/T 9101. Impeller overspeed test should be conducted according to the provisions of JB/T 6445. Field test of the fan should be conducted according to the provisions of GB/T 10178. Appearance quality test of the fan can be conducted through visual check. Mechanical safety protective guard should be tested according to the provisions of GB/T 19074.5 Inspection Rules Each fan must pass the test conducted by technical inspection department of the manufacture, and can not be delivered without certificate of fan quality. Classification of inspection:Inspection of the fan falls into predelivery inspection and type inspection. Predelivery Inspection:Predelivery inspection items of the fan should include:a) Mechanical running test of the fan。e) Check of radial singleside clearance between air inlet and inlet of wheel disc. Type Inspection:Type inspection items of the fan should include:a) Predelivery inspection items。 or obsolete products manufactured after factory shifting。b) One of ten fans should be tested if the machine No. Is between No and No (Count the fans as 10 if they are less than 10)。 the content of the nameplate should include:a) Type and name。 speed of rotation (unit: r/min