API 650 liquid-storage tanks hydrostatic testing requirements

Impact Tests for High Alloys
Impact tests are not required for oil steel storage material nickel alloy welds made with electrodes/filler metals covered by AWS Specification A5.11 or AWS Specification A5.14, provided the nominal nickel content is 50% or greater, and the weld is deposited by the shielded metal-arc welding (SMAW), gas metal-arc welding (GMAW), gas tungsten-arc welding (GTAW), or plasma-arc welding (PAW) processes. When A5.11/A5.14 specifies the nickel content as a “remainder,” the nickel content shall be determined by summing the maximum specified values of the other elements (use the average specified value for elements with specified ranges) and subtracting from 100%.

Under the action of the earthquake, API 650 storage tank is mainly damaged by the phenomenon of the lower part of the API 650 liquid-storage tanks tank wall. Therefore, the key point of seismic calculation is to prevent the tank wall from buckling under axial pressure.

A West Africa customer 112000pcs ASTM A36 Screw Ribbons for project West Africa Gas Pipeline (WAGP) in 2017 year. A36 carbon steel’s strength, formability, and excellent welding properties make it suitable for a large variety of applications, including welding, fabricating, and bending. Our customer is satisfied with our carbon steel A36 Screw Ribbons. If you are interested in our steel machining parts, welcome to contact us.

When the day light gradually decreases, the temperature of oil in the API 650 liquid-storage tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API 650 liquid-storage tanks will also decrease. When the pressure in the API 650 liquid-storage tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API 650 liquid-storage tanks through the open vacuum valve, which is the "suction" process of the oil tank.

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