There should be no cracks in the appearance of stainless steel reducers

　　There should be no cracks and heavy skin in the appearance of stainless steel reducer, and the wall thickness should be greater than that of the section with large diameters. The center line at both ends of Butt Weld Eccentric Stainless Steel Concentric Reducer should coincide, and the allowable deviation of eccentricity is (+5mm). The center line at both ends of concentric pipe with different diameters should coincide, and the allowable deviation of eccentricity is (+5mm).

　　The quality of stainless steel reducer should conform to the current national standard GB/T 12459-2005, the roundness of stainless steel reducer should not be greater than 1% of the corresponding end diameters, and the allowable deviation should be (+3 mm); the allowable deviation of stainless steel reducer should meet the requirements of Table 4.2.2-3. There should be no cracks and heavy skin in the appearance of stainless steel reducer, and the wall thickness should be greater than that of the section with large diameters. The allowable deviation of concentric pipe size shall be in accordance with Table 4.2.2-3. The allowable deviation of the diameter of the pipe shall be in accordance with Table 4.2.2-3.

　　The roundness of stainless steel reducer should not be greater than 1% of the corresponding end diameter, and the allowable deviation should be (+3 mm); the center line of the two ends of stainless steel reducer, and the allowable deviation of eccentricity should be (+5 mm). The roundness of stainless steel reducer should not be greater than 1% of the corresponding end diameter, and the allowable deviation should be (+3 mm); the allowable deviation of eccentric pipe fitting reducer should be in accordance with Table 4.2.2-3.

　　If the setting temperature is too high, the silicon carbon tube and the pipe fitting reducer may break down, so the setting temperature should be reset. The heating element is twin-threaded silicon-carbon tube, coated corundum tube, corundum tube is a new thermal insulation material outside, the combustion tube adopts corundum tube with different diameter, which is directly inserted into the silicon-carbon tube.