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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