Page 44 - Vol.15
P. 44
Tech
Notes
技術專文
圖二、FM 1-44 Table 2-Table5
Table 2. P r (psf) English Units
A S /A V
P V
(psf) 14* 14-1/2 15 15-1/2 16 16-1/2 17 17-1/2 18 18-1/2 19 19-1/2 20 20-1/2 21 21-1/2 22 22-1/2 23 23-1/2 24 24-1/2
20* 70 76 81 87 92 98 104 110 117 123 130 137 144 151 158 166 174 182 190 199 207 216
25 75 76 81 87 92 98 104 110 117 123 130 137 144 151 158 166 174 182 190 199 207 216
30 80 80 81 87 92 98 104 110 117 123 130 137 144 151 158 166 174 182 190 199 207 216
35 85 85 85 87 92 98 104 110 117 123 130 137 144 151 158 166 174 182 190 199 207 216
40 90 90 90 90 92 98 104 110 117 123 130 137 144 151 158 166 174 182 190 199 207 216
* Or less
Calculation based on: Pr = C ( 2 A S ) ×144( psf )
2
A V psi
1/2
Where: C=0.05 (psi) for ammonia
No extrapolation beyond these ranges should be made.
Linear interpolation will provide a reasonable level of accuracy.
Min. P r = P v + 50 psf
Table 3. P r (psf) English Units
A S /A V
P V
(psf) 3* 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
20* 70 74 80 87 93 100 106 113 119 125 131 138 145 151 158 164 170 176 183 190 196
25 75 74 80 87 93 100 106 113 119 125 131 138 145 151 158 164 170 176 183 190 196
30 80 74 80 87 93 100 106 113 119 125 131 138 145 151 158 164 170 176 183 190 196
35 85 74 85 87 93 100 106 113 119 125 131 138 145 151 158 164 170 176 183 190 196
40 90 74 90 90 93 100 106 113 119 125 131 138 145 151 158 164 170 176 183 190 196
* Or less
Linear interpolation is acceptable.
No extrapolation should be made beyond table limits.
Min. P r = P v + 50 psf
Table 4. P r (psf) English Units
A S /A V
P V
(psf) 3* 3-1/2 4 4-1/2 5 5-1/2 6 6-1/2 7 7-1/2 8 8-1/2 9 9-1/2 10 10-1/2 11 11-1/2 12
20* 70 75 84 92 100 109 117 125 134 142 150 158 166 173 181 190 199 207 215
25 75 75 84 92 100 109 117 125 134 142 150 158 166 173 181 190 199 207 215
30 80 80 84 92 100 109 117 125 134 142 150 158 166 173 181 190 199 207 215
35 85 85 85 92 100 109 117 125 134 142 150 158 166 173 181 190 199 207 215
40 90 90 90 92 100 109 117 125 134 142 150 158 166 173 181 190 199 207 215
* Or less
Linear interpolation is acceptable.
No extrapolation beyond table limits should be made.
Min. P r = P v + 50 psf
Table 5. P r (psf) English Units
A S /A V
P V
(psf) 4.75* 5 5.25 5.5 5.75 6 6.25 6.5 6.75 7 7.25
20* 100 104 115 126 136 150 163 176 190 204 216
25 100 104 115 126 136 150 163 176 190 204 216
30 100 104 115 126 136 150 163 176 190 204 216
35 100 104 115 126 136 150 163 176 190 204 216
40 100 104 115 126 136 150 163 176 190 204 216
* Or less
2
Calculation based on: Pr = C ( 2 A S ) ×144( psf )
A V psi
1/2
Where: C=17 (psi)
Min. P r = P v + 50 psf
No extrapolation beyond these ranges should be made.
Linear interpolation will provide a reasonable level of accuracy.
當無洩壓構件設計時,爆炸壓力將 備(耐壓值 P des )與結構安全形成 力(P red )時,瞬間開啟洩壓構件,
隨時間快速累積(虛線曲線),可 威脅;但在妥適的洩壓構件設計下, 導引釋放壓力(實線曲線),以達
能形成超壓,達到 P max 而同時對設 爆炸壓力則會在達到設計之洩爆壓 到安全保護的作用。
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