• Author / Uploaded
• Farhan Putra

Citation preview

DIMENSIONAL TOLERANCES (API 650) No.

Item

Tolerances

Reference Section

- The maximum out of plumbness of the top of the shell relative to bottom of shell shall not exceed 1/200 of the total tank height 1

Plumbness

- The out of plumbness in one sheel 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.

See 7.5.2

- Radii measured at 0.3 m (1 ft) above the bottom corner shall not exceed the following tolerances :

2

3

4

5

Roundness

Peaking

Banding

Flat Spots

See 7.5.3

- Deviations at vertical weld joints shall not exceed 13 mm. (By using sweep board with 90 cm long with the same radius of the tank) - Deviations at horizontal weld joints shall not exceed 13 mm. (By using 90 cm straight edge verticall sweep board) - Shall not exceed the appropriate plate flatness and waviness as required by ASTM A6, A20 or A480 as applicable.

See 7.5.4 (a)

See 7.5.4 (b)

See 7.5.4 (c)

For Horizontal Foundation - Where a concrete ring wall is provided under the shell, the top of the ring wall shall be level within ± 3 mm in any 9 m of the circumference.

6

Foundations

- Where a concrete ring wall is not provided, the foundation under the shell shall be level within ± 3 mm in any 3 m of the circumference. For Sloping Foundation - Where a concrete ring wall is provided , ± 3 mm in any 9 m of circumference - Where a concrete ring wall is not provided , ± 3 mm in any 3 m of circumference

See 7.5.5

No.

Item

Tolerances

Reference Section

Nozzles (excluding manhole) shall be installed within the following tolerances - Specified projection from outside of tank shell to extreme face of flange ± 5 mm

7

Nozzles

- Elevation of shell nozzle or radial location of a roof nozzle ± 6 mm

See 7.5.6

- Flange tilt in any plane, measured on the flange face : ± 1/2 degree for nozzles greater than NPS 12 * in. nominal diameter ± 3 mm at the outside flange diameter for * nozzles NPS 12 and smaller - Flange bolt hole orientation ± 3 mm Manhole shall be installed within the following tolerances: - Specified projection from outside of shell to extreme face of flange, ± 13 mm 8

Shell Manhole

- Elevation and angular location, 13 mm - Flange tilt in any plane, measured across the flange diameter, 13 mm

See 7.5.7