ISO 630 Gr E275 plates API Std 650 welded steel storage tanks

Similarities between API 650 and API 620 tanks Both tanks are used for storage purposes. Both API 620 and API 650 containers API Std 650 welded steel storage tanks can be made of carbon steel, austenitic stainless steel and nickel alloy (only for low temperature).

Protection of Plates during Shipping and Storage
Plates shall be adequately protected during shipping and storage to avoid damage to API Std 650 welded steel storage tanks material plate surfaces and edges from handling (scratches, gouge marks, etc.) and from environmental conditions (corrosion, pitting, etc.).
Plates shall be protected from moisture or stored in inclined position to prevent water from collecting and standing on surface.

Tank cracks are common API Std 650 welded steel storage tanks defects, mainly including tank wall cracks, internal cracks, weld zone cracks. The reason for these defects may be that the defects not exceeding the standard existed in the early stage of API Std 650 welded steel storage tanks construction, which become obvious after the later use. Or in the process of using the API Std 650 welded steel storage tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.

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