Seismic Use Group for API 650 mixed material tanks
Generally speaking, the duration of the "exhalation" of the API 650 mixed material tanks is longer than that of the "inhalation" of the API 650 mixed material tanks every day. There are many factors affecting the "small breathing" loss, mainly including the following points: the change of temperature difference between day and night, sunshine time of the API 650 mixed material tanks location, open area of the API 650 mixed material tanks, atmospheric pressure, filling degree of API 650 mixed material tanks, etc. When the API 650 mixed material tanks is full of gas, the space volume is small, and the "small breathing" loss is less; if the space volume is large, the loss is also large.
Structural shapes of 9% and 5% nickel steel may be furnished to the chemical and physical requirements of ASTM A353, A553, or A645. Physical tests shall be in accordance with the requirements of ASTM A6. API 650 mixed material tanks used Piping, Tubing, and ForgingsMaterial used for piping, tubing, and forgings shall be compatible in welding strength, and thermal expansion coefficient with the tank shell material. In addition to the specific requirements of this appendix, all piping within the limitations of 1.3.2 shall fulfill the minimum requirements of ASME B31.3.
API 650 is constructed from carbon steel, austenitic duplex stainless steel, and API 650 mixed material tanks aluminium A Welding Certification is stipulated by American Society of Mechanical Engineers (ASME), Section 10. There is a required inspection, no third party. The inspection cost is the cost of the NDE.
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