Chiho Hebei Industry; when the diameter itself is not 15crmo diameter pipe, before and after the diameter difference is not the time, with concentric size head, vapor lock phenomenon may not be so obvious reducers, self-priming in the absorption process Pressure changes are not so great, so jeopardize not reflected. Strength 316L size of the head is generally higher than the Longitudinal, can narrow diameter pipe 20 # billet production of large diameter elbow, you can also use the same width of the billet production of different pipe diameters. When the absorbent, water pressure suction pipe is lowered, originally dissolved in water will be isolated by the gas, if using a concentric reducer 12cr1movg diameter pipe, the gas can not be discharged, it will accumulate \ blockage in the projections, forming air resistance. There will be noise and water pump capacity declined significantly. If eccentric head, isolate the gas will be discharged in time, it will not form a vapor lock. Chiho quality Hebei Industry 304 concentric reducer should be consistent with existing national standards, "welded steel seamless pipe fittings" GB / T 12459-2005, and should meet the following requirements: roundness 1) 304 concentric size head should not exceed 1% of the respective ends of the outer diameter, and the tolerance of ± 3mm, concentric reducer centerline ends should overlap, their eccentricity tolerance of ± 5mm. 2) 304 concentric size head appearance should not have cracks, heavy leather wall thickness greater than the thickness of the large diameter end of the pipe section 304 concentric size head inside 12459-2005 standard tolerances DN15-65 caliber: +1.6 -0.8 inner diameter: ± 0.8 height: ± 2DN80-100 Diameter: ± 1.6 inner diameter : ± 1.6 height: ± 2DN125-200 Diameter: +2.4 -1.6 inner diameter: ± 1.6 height: ± 2DN250-450 Diameter: +4 -3.2 inner diameter: ± 3.2 height: ± 2DN500-800 Diameter: +6.4 -4.8 inner diameter: ± 4.8 height: DN500-600 ± 2 DN650-750 ± 3 DN800 ± 5 wall thickness of not less than 87.5% of nominal wall thickness of the roundness deviation of plus or minus the sum of the absolute values. But generally below 500 roundness within 4MM. Quality 15316L head size should be consistent with existing national standards, size, head size tolerances shall comply with standards. Roundness head size should not exceed 1% of the respective ends of the outer diameter of the eccentric head appearance should not have cracks, heavy leather wall thickness greater than the thickness of the large diameter end of the tube segment, and tolerance of ± 3mm; concentric size head centerline ends should overlap, their eccentricity tolerance of ± 5mm. Diameter pipe plant | Hebei Chiho (certified) | Xianyang reducer by Chiho Hebei Industry Co., Ltd. Hebei Chiho Pipe Co., Ltd. (www.hbqh628.com) (www.hbqh628.com) Hebei Cangzhou, forging leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Hebei Chiho leadership with the staff warmly welcome all inquiries negotiations to create the Hebei Chiho better future.