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不冲突
22.7.3.2 The wetted area of the tank shall be calculated as follows:
(1)Fifty-five percent of the total exposed area of a spfhere or spheroid.
(2)Seventy-five percent of total exposed arera of a horizontal tank.
(3)One hundred percent of the exposed shell and floor area of a rectangular tank,but excluding the top
surfce of the tank.
(4)The first 30 ft(9m) above grade of the exposed shell area of a vertical tank.
Technical Justification and Test Identifier
in Directory
1 Results of Test S-42, with extrapolation of data to
allow increase in maximum ceiling height from
27 ft (8.2 m) to 30 ft (9.1 m).
2 Results of Test S-40, with extrapolation of data to allow increase in maximum ceiling height from
27 ft (8.2 m) to 30 ft (9.1 m).
3 Results of Tests S-22 through S-44, with emphasis on Test S-40, in which no ceiling sprinklers operated. Test S-26 justifies
increasing maximum container size from 1 gal (3.8 L) to 5 gal (19 L).
4 Extrapolation of data in Ref. No. 3. Reduced hazard of Class IIIB liquids justifies increase in allowable storage height and
maximum ceiling height and decrease in required ceiling sprinkler design area.
5 Based on data in Ref. No. 3 above. Potential for larger spill justifies increase in ceiling sprinkler design density and
disallowing quick-response sprinklers. In addition, Tests 572 through
576 indicate the need for face sprinklers at the first level at each rack upright to prevent collapse of
the rack due to fire.
6 Results of Tests S-22 through S-44. Reduced hazard of Class IIIB liquids justifies increase in allowable storage height and
maximum ceiling height and decrease in required ceiling sprinkler design density. Increased container size justifies
increase in ceiling sprinkler design area compared to
Ref. No. 4.
7 Results of Test S-31.
8 Results of Tests S-22 through S-44, with emphasis on Test S-40. Use of relieving-style container is expected to reduce
potential for container
rupture, but could contribute to rate of heat release during a fire.
9 Based on data in Ref. No. 4 and recognition that there is little advantage to use of relieving-style containers for Class
IIIB liquids.
10 Results of Tests S-22 through S-46. See also
Ref. No. 5. Increase in ceiling sprinkler design density justifies in-rack sprinklers at every other level, rather than at
every level. In addition, Tests
572 through 576 indicate the need for face sprinklers at the first level at each rack upright to prevent collapse of the
rack due to fire.
11 Based on data in Ref. No. 6 and recognition that there is little advantage to use of relieving-style containers for Class
IIIB liquids.
12 Based on protection criteria recommended for portable tanks in Appendix D of 1993 edition of NFPA 30 and on results of
Tests S-45 and S-46. In addition, Tests 572 through 576 indicate the need for face sprinklers at the first level at each rack
upright to prevent collapse of the rack due to fire.
13 Based on protection criteria recommended for portable tanks in Appendix D of 1993 edition of NFPA 30 and data in Ref.
No. 6 and recognition
that there is little advantage to use of relieving-style containers for Class IIIB liquids. |
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发表于 2022-5-6 20:43:22
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