Fully pressurized liquefied hydrocarbon tank farm
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This post was last edited by Man Yu on 2010-3-18 at 15:50. The distance between the fire dike and spherical tanks in fully pressurized liquefied hydrocarbon storage areas has always been required to be no less than 3 meters, in accordance with the requirements of GB50160. Now, one construction entity’s layout plan has not been approved, on the grounds that the Design Code for Tank Fire Dikes GB50351 stipulates that this distance should be no less than the radius of the spherical tank. Has anyone designed according to this standard? They are all national standards; the regulations for a particular issue vary. Is it necessary to adhere to strict rules?
This issue has been debated many times! Finally, the approach suggested by the **Standard Compilation Department is to use the larger size if there is enough space; otherwise, the smaller size can be used as well! Hehe
I hope experts can explain this issue; I used to use 3 meters as well. I’m not sure which of these two standards is more stringent.
There is no doubt that the petrochemical regulations are more authoritative. This can be analyzed and shown to him; the standards also need to make sense. The distance between the tank area and the fire dike is primarily intended to ensure that, in the event of a liquid leak, the spray from the highest points does not reach outside the fire dike; however, when liquefied hydrocarbon tanks leak, gas is released, so there is no such issue with tanks at atmospheric pressure. So 3 meters makes sense, 1.5 meters is unreasonable, but I usually go with 5 meters
The design code for fire dikes in tank areas was established in 2005, while the design code for petrochemical enterprises came into effect in 2008; generally, the newer one should take precedence； The other one that obeys strongly also obeys the petrification rules!
From a practical perspective, the views of the local fire department are the most important.
Personally, I believe the GB50351 code for the design of fire dikes for storage tanks should be followed
I encountered this problem; after explaining it to the local fire department, it was designed with a length of 3 meters. The 3-meter standard is a national standard, applicable to enterprises such as refineries and chemical plants. The radius standard is also a national standard, but it favors enterprises such as long-distance transfer stations that have ample land available for acquisition.
It should comply with the requirements specified in the GB50351 code for the design of fire dikes for storage tanks. For current LNG tanks at atmospheric pressure, according to NFPA59, the diameter of such dikes should be half of the diameter of the storage tank
In my opinion, in the case of spherical tank areas, the layout should be arranged such that the distance is at least equal to the radius of the tanks; this approach is more appropriate both in terms of layout coordination and safety. On the other hand, if the spherical tanks are very large, it is clearly unreasonable to require a distance of at least 3 meters. In other words, the layout of large spherical tanks should follow the principles applicable to large atmospheric storage tanks, which is also the intention behind the relevant standards. So, the newly designed one must definitely be large-sized. The requirement of 3M or more mainly applies to horizontal small pressure storage tanks; this is related to the layout of the equipment, as the radius of horizontal tanks rarely exceeds 3 meters. The key is to understand the essence, rather than merely adhering mechanically to the rules.