A573 grade 65 plates API standard 650 unanchored flat-bottom tank

In order to prevent the deformation of the bottom of metal vertical API standard 650 unanchored flat-bottom tank during welding, comprehensive control measures such as strict control of assembly geometry size, reasonable welding procedure, process control of welding deformation and rigid fixation are adopted during assembly welding. The specific methods are as follows:
1. Strictly control welding groove forming of API standard 650 unanchored flat-bottom tank.
2. Strictly control the size of tank welding seam assembly.
3. Define the welding sequence of tank bottom plate.
4. Reasonable distribution of welders.

Lateral braces between outer bay rafters must be provided if asymmetrical structural shapes are used for rafters and if the API standard 650 unanchored flat-bottom tank API 650 tanks are located in areas subject to earthquakes. The bracing must be adequately sized for the seismic zone specified.

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Temperature Range: The provisions in this appendix are considered suitable for API standard 650 unanchored flat-bottom tank design metal temperatures from + 40°F to –60°F, inclusive. In general, refrigerated tank primary components include those components whose failure would result in leakage of the liquid being stored, those exposed to the refrigerated temperature, and those subject to thermal shock. Further definitions of such components are provided in API Standard 620 tank R.1.4.2 and R.1.4.3.