API standard 650 cylindrical liquid-storage tank data sheets

Charpy V-notch specimens shall be taken from the weld metal and from the heat-affected zone of the welding procedure qualification test plates or from duplicate test plates.
Weld metal impact specimens shall be taken across the weld with the notch in the API 620 oil tank material weld metal. The specimen shall be oriented so that the notch is normal to the surface of the material. One face of the specimen shall be substantially parallel to and within 1/16 in. of the surface.

Fabricated to API standard 650 Welded Tanks for Oil Storage Shop Assembled API standard 650 cylindrical liquid-storage tank Storage Tanks, these tanks are commonly used at oil and natural gas terminals, API standard 650 cylindrical liquid-storage tank processing plants, and midstream facilities located along pipelines at the pumping, compression, or metering stations. API 650 storage tanks are designed and fabricated considering operating pressures up to 2.5 PSIG, corrosion allowance, wind loading, and seismicity.

Static storage loss is also known as "small breathing" consumption. The rise and fall of the temperature in the API standard 650 cylindrical liquid-storage tank leads to the increase and decrease of the pressure in the tank, which makes the mixed oil gas discharged from the tank, and the external air is sucked into the tank, resulting in the oil consumption. Fluid level loss is also called "big breathing" loss. It is the oil consumption caused by the change of gas space volume in the API standard 650 cylindrical liquid-storage tank during the oil receiving and sending operation, which causes the mixed oil gas to be discharged out of the tank, and the external air is sucked into the tank, resulting in the oil consumption due to the change of liquid level height.