Arrangement of self-priming pumps
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For the discharge pumps of buried tanks containing Class A and B media, self-priming pumps are to be used. I have been reading posts on this topic for 10 years, at the address https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1283034&highlight=%B4%C5%C1%A6%D7%D4%CE%FC “Selection of Pumps for Underground Solvent Tanks”. One of the statements in those posts reads: “The design institute said that according to the regulations, the pumps must be placed 10 meters away from the underground tanks; that’s why it was decided to use submersible pumps.” Of course, it was changed to 5 meters later. Which specification is this, and should it be implemented now?
In accordance with relevant domestic regulations and safety requirements, discharge pumps for buried storage tanks do indeed need to maintain a certain safety distance; however, the specific regulatory codes require reference to the latest ** or industry standards. It is recommended to contact the design institute or consult the latest relevant standards such as the \"Code for Fire Protection Design of Petrochemical Enterprises\" to determine whether this requirement still needs to be followed. At the same time, other technologies or measures can be considered to meet the requirements for safety distances. .
When several pumps are arranged in groups, the spacing between them needs to be considered； If it is for single-use only, there is no need to consider anything other than Class A. So, your question needs to be determined based on specific conditions, not just the issue of category A or category B. The figure of 5 meters is unclear as to its origin; for specific details, please refer to GB50160--2018, section 5.3.5. The dedicated pump area for tank assemblies should be located outside the fire dike, and the fire separation distance from the storage tanks shall comply with the following requirements: 1. It should be no less than 15 meters from Class A storage tanks ； 2. The distance from such tanks should be no less than 12 m for fixed-roof storage tanks of categories A and B; it should be no less than 10 m for fixed-roof storage tanks of categories A and B with a capacity of 500 m3 or less ； 3. The distance from floating roof and internal floating roof storage tanks, as well as Class C A fixed-roof storage tanks, should be no less than 10 m; for internal floating roof storage tanks and Class C A fixed-roof storage tanks with a capacity of 500 m3 or less, the distance should be no less than 8 m. 5.3.6 When the dedicated pump for combustible liquid storage tanks other than Class A tanks is installed separately, it shall be placed outside the fire dike, with no requirement for a fire separation distance from the combustible liquid storage tanks.
It is recommended to contact the design institute for clarification; furthermore, it should be determined whether the existing equipment needs to be adjusted in accordance with the new standards