API 650 carbon steel storage tanks seal membrane

API 620 crude oil tank piping materials made according to ASTM A333 and A350 may be used at API 650 carbon steel storage tanks design metal temperatures no lower than the impact test temperature required by the ASTM specification for the applicable material grade without additional impact tests. For temperatures below those allowed by the ASTM specification, the following paragraph shall apply.

Welding certification is regulated by Section 10 of the American Society of Mechanical Engineers (ASME). For both API 650 carbon steel storage tanks storage tank API 650, non-destructive inspection is required, but third-party inspection is not required.

In April 2018, our Philiphine customer purchased 1008 Tons API5L Gr.B ERW&Q345B SMLS pipe for offshore oil field resources drilling project. This is a regular demand almost two month, and we has been cooperated more than three times, totally around 2100 tons steel pipe since 2015 year.

Under the condition of static storage without receiving and sending operation, the temperature of gas space, evaporation rate, depth and pressure of vapor in the API 650 carbon steel storage tanks will change with the change of temperature and pressure in a day. The oil loss caused by the process of discharging oil vapor and inhaling air gas is called "small breathing" loss, which is also called static storage loss of oil tanks.

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