API standard 650 unanchored tanks spectral acceleration coefficients

Inspection of Butt-welds in Piping
Butt-welds in piping and in API standard 650 unanchored tanks pipe fittings within the limitations of 1.3.2 (including the annular space of double- wall tanks) shall be inspected in conformance with API 620 oil tank standard Q.7.7.2 through Q.7.7.6. Longitudinal welded joints in piping that contains liquid shall be completely radiographed except for manufactured pipe welded without filler metal, 12 in. or less in diameter, which is tested hydrostatically or by eddy current to ASTM requirements.

The internal floating plate of internal floating roof tank of API 650 tank is different from that of open floating plate of API standard 650 unanchored tanks External floating roof tank of API 650 tank, so it is impossible to have rain and snow load.

In January 2019, one of our Vietnam customer purchased 395.62 tons Q345B steel plate API standard 650 unanchored tanks for their construction project, we prepared all the goods ready within 5 days, and supplied the goods with painting sand blasting to SA2.5 API standard 650 unanchored tanks and priming gray oxide primer, and arrange shipment in time. Meet the customer urgent delivery request.

Corrosion of the API standard 650 unanchored tanks body caused by external conditions such as high temperature, rain, humidity, or inadequate anti-corrosion measures of the oil storage tank itself, the water-bearing deposits in the oil storage tank caused corrosion and perforation of the inner surface of the oil storage tank bottom plate. Defects fatigue cracks caused by stress, with the accumulation of time, the compressive strength of the API standard 650 unanchored tanks body decreases and corrosion cracks occur.

The after-sales service department will pay return visit to each customer by call or email, report problems found during the return visit in time, and discuss with the production and quality inspection center to propose effective solutions and follow up in a timely manner, so as to ensure the benefits each customer are fully guaranteed, and to provide customers with more value-added services.