How to test bottom seams of API 650 cylindrical liquid-storage tank

The internal floating plate of internal floating roof tank of API 650 tank is different from that of open floating plate of API 650 cylindrical liquid-storage tank External floating roof tank of API 650 tank, so it is impossible to have rain and snow load.

Aftershock Level Earthquake (ALE)
This design case shall be applicable only when regulations or project documents specifically require the tank system to be designed or evaluated for aftershocks.
If the outer tank is not designed as a secondary containment (i.e. it serves as vapor barrier and pressure boundary only and is not constructed of API 620 material suitable for the inner tank API 650 cylindrical liquid-storage tank), then no design or evaluation for ALE is required by these provisions for the inner or outer tank.

Anti corrosion of API 650 cylindrical liquid-storage tank:
After using for a certain period of time, it is necessary to check the corrosion protection of the API 650 cylindrical liquid-storage tank. If necessary, the outer wall of the metal oil tank should be painted with new anti-corrosion paint to ensure that the outer wall of the API 650 cylindrical liquid-storage tank does not fall off and has good waterproof and rust resistance.
API 650 cylindrical liquid-storage tank cleaning:
The long-term use of API 650 cylindrical liquid-storage tank will produce impurities on the tank wall and deposit on the tank bottom, resulting in tank corrosion to leakage. According to the safety standard of oil tank, the API 650 cylindrical liquid-storage tank shall be cleaned and derusted regularly to ensure the quality of oil stored and the safety of oil tank equipment.

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