Design Standards for Large Atmospheric Pressure Cryogenic Liquid Storage Tanks
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Previously: The design of large-scale atmospheric-pressure cryogenic liquid storage tanks in companies was carried out in accordance with the standard JB4735-97 for \"Welded Steel Atmospheric-Pressure Vessels.\" The design pressure was 30 KPa, and the temperature was 196 degrees. The inner tank was made of stainless steel 0Cr18Ni9, with an allowable stress of 137. Currently, the JB4735-97 standard has been revoked, and it has been replaced by the new standard NB/T 47003.1-2009 \"Welded Steel Atmospheric-Pressure Vessels.\" This new standard contains much less information; for example, there are no provisions regarding design aspects. Does this mean that designs cannot be carried out in accordance with the new standard NB/T 47003.1-2009? At present, our designs are carried out in accordance with the standard SYT 0608-2006 \"Design and Construction of Large-Scale Welded Low-Pressure Storage Tanks.\" Under this standard, the allowable stress for stainless steel 0Cr18Ni9 is 155, which is significantly higher than the 137 specified in the NB/T 47003.1-2009 standard. It should be fine to use a allowable stress of 155 for stainless steel 0Cr18Ni9. How are such contradictions handled in China?
The approaches to the two standards are different. The SYT 0608-2006 standard \"Design and Construction of Large Welded Low-Pressure Storage Tanks\" is basically based on the principles of API620. The NB/T 47003.1-2009 standard was originally formulated for atmospheric pressure storage tanks. For large low-pressure storage tanks, SYT 0608-2006 or API620 can be selected. For amounts below 50,000, the NB/T 47003.1-2009 standard can be applied. The standard for selecting the allowable stress must be followed; they cannot be used interchangeably. In addition, standard NB/T 47003.1-2009 recommends the use of values below 50,000, not including 50,000. Because the NB/T 47003.1-2009 standard is based on the fixed-point method. For reference only.
It is mainly the allowable stress that affects costs; if the bidding standards are different, it becomes difficult to provide quotes that are consistent
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