Questions regarding the total volume of tank groups and the spacing between individual tanks in petrochemical regulations
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(1) For the table in 5.2.1, where can I find the spacing requirements for device tank groups (total volume): greater than 5000 cubic meters for combustible gases, greater than 500 cubic meters for liquefied hydrocarbons, and greater than 5000 cubic meters for combustible liquids? (2) In the table of 6.2.8, for fixed-roof tanks of categories A, B, and C with a capacity of ≤1000 cubic meters, why is the required spacing the largest, at 0.75D? Because it’s the most dangerous? I would appreciate it if everyone could share their insights: handshake
For the first question, refer to clause 5.2.22: “...the fire protection design of the storage tank units of the facility shall comply with the relevant provisions in Chapter 6 of this code...”, that is, Table 6.2.8 shall be applied. The second issue is primarily related to fire safety; the safety distance of 0.4–0.6D has proven to be both safe and cost-effective in practical applications. However, for storage tanks with a capacity of less than 1000 m3, using 0.4–0.6D as the standard for determining the distance between tanks is not conducive to fire rescue efforts. Therefore, a larger distance is required for such tanks. For reference only.
For item 1, refer to the notes in Table 2: the total volume of the device’s storage tank assembly shall meet the requirements of 5.2.22; if it is larger, the relevant provisions in Chapter 6 shall be applied. The spacing between storage tanks in Article 2 takes into account the effect of the thermal radiation from a tank on fire on adjacent tanks; this can be calculated using software through modeling. Generally, small storage tanks have relatively small diameters, and to ensure a certain distance requirement, a larger multiple is specified. The value of 0.75 is also a safety factor derived from simulation results.
6.2.8 refers to the spacing within a tank group; then, what fire protection regulations apply to tank groups that exceed the volume limits specified in 5.2.1, as well as to other equipment and buildings? Thank you
6.2.8 refers to the spacing within a tank group; then, what fire protection regulations apply to tank groups that exceed the volume limits specified in 5.2.1, as well as to other equipment and buildings? Thank you
My understanding is that if it exceeds the specifications for the storage tanks in a unit cluster, it should be treated as a tank cluster within the plant area, and in that case, Table 4.2.12 can be applied
Are the volumes given in 4.2.12 all for a single tank?
The distance from the device is considered on a per-tank basis
Storage tanks that exceed those listed in Table 5.2.1 cannot be referred to as unit storage tank groups; they belong to the plant’s overall storage tank area, and of course, the rules in Table 4.2.12 apply to them. The petrochemical regulations stipulate that the distance from other structures and buildings should be determined on a per-tank basis.