Quality standard and use method of the size head
Release time:
Dec 01,2020
The corresponding standards for flanges and tubesheets matched with pressure vessels of the power department standard GD0506 ~ 0507 of the large and small heads: JB/T4700 ~ 4707-2000 implement the national standards (GB/T9112-2000), the standards of the machinery department (JB/T81-1959,JB/T74-1994), the standards of the petrochemical department (SH3406-1996), the standards of the chemical department (HG/T5010-1958,HG/T20592-2009), etc. Export forged steel flange material in line with the United States ASTM A105 standard.
The quality of the eccentric reducer shall comply with the current national standards, and the allowable deviation of the size of the reducer shall comply with the provisions of Table 4.2.2-3. The roundness of the reducer shall not be greater than 1% of the outer diameter of the corresponding end, the appearance of the eccentric reducer shall be free of cracks and heavy skin, the wall thickness shall be greater than the wall thickness of the large-diameter end section, and the allowable deviation shall be ± 3mm; The center lines at both ends of the concentric reducer shall coincide, and the allowable deviation of the eccentricity value shall be ± 5mm.
the use of the size of the head:
When the pipe diameter itself is not large and the difference between the front and rear pipe diameters is not large, the air resistance phenomenon may not be so obvious with concentric reducers, and the air pressure change in the self-priming process is not so large, so the harm is not reflected,
When absorbing water, the water pressure of the suction pipe section is reduced, and the gas dissolved in the water will be separated out. If concentric reducers are used, these gases cannot be discharged in time and will accumulate and block the protrusion, forming air resistance. The pump is also noisy and the water delivery capacity is greatly reduced. If an eccentric reducer is used, the separated gas will be discharged in time without forming a gas lock.
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