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I would like to know what the allowable tolerances are for verticality and deflection of the tower after installation?

2016-05-17View Original

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I would like to know what the allowable tolerances are for verticality and deflection of the tower after installation? It has not been found in the standards. Thank you.
Reply #22016-05-17
JB4710-92 \"Steel Tower Containers\", Page 33, Clause 7.2, Table 7-1: \"Straightness: The deviation for any 3-meter-long cylindrical section shall not exceed 3 mm.\" When the cylinder length L is 15 meters or less, the straightness of the shell shall not exceed 1‰ of the length. When the shell length exceeds 15 meters, the deviation shall not be greater than (0.5L/1000 + 8)”. GB50461-2008 Code for Acceptance of Construction Quality of Installation of Static Equipment in Petrochemical Industries: Article 4.4.1 states that for vertical equipment, when H≤30,000, the value is H/1000 mm; when H>30,000, it is H/1000 mm and ≤50 mm. SH3514-2001 \"Quality Assessment Standards for Equipment Installation Projects\", Table 6.2.12: \"For general vertical equipment, the verticality shall be h/1000, but not exceeding 30 mm.\" Equipment for mechanical connection: h/1000” JB4735-97 \"Steel Welded Atmospheric Pressure Vessels\", page 147, clause 15.4.4.10 – The straightness of each section of the tank shall not exceed 0.1% of the height of that section; the overall straightness after assembly shall not exceed 0.2% of the total length, and shall also not exceed 30 mm”

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