Frank Zhang
Industrial
- Nov 16, 2019
- 8
Dear expert,
We are constructing a tank with 41.4m diameter.
As per API 650 stated:
7.5.2 Plumbness
a) The maximum out-of-plumbness of the top of the shell relative to the bottom of the shell shall not exceed 1/200 of the total tank height. The out-of-plumbness in one shell course shall not exceed the permissible variations for flatness and waviness as specified in ASTM A6M/A6, ASTM A20M/A20, or ASTM A480M/A480, whichever is applicable.
My carbon steel shell plate size is 2875 x 9303 x t8 mm. As per ASTM A6M/A6 the flatness is 38mm.
So this one shell course plumbness after assembly is 38 mm or 38/2=19mm?
Thank you
Frank Zhang
We are constructing a tank with 41.4m diameter.
As per API 650 stated:
7.5.2 Plumbness
a) The maximum out-of-plumbness of the top of the shell relative to the bottom of the shell shall not exceed 1/200 of the total tank height. The out-of-plumbness in one shell course shall not exceed the permissible variations for flatness and waviness as specified in ASTM A6M/A6, ASTM A20M/A20, or ASTM A480M/A480, whichever is applicable.
My carbon steel shell plate size is 2875 x 9303 x t8 mm. As per ASTM A6M/A6 the flatness is 38mm.
So this one shell course plumbness after assembly is 38 mm or 38/2=19mm?
Thank you
Frank Zhang