| 摘要 |
PURPOSE:To enable judging the opening of pressure discharge plate with a simple constitution by setting a plurality of continuous pressure regions in two closed vessels and using combinations of pressure regions containing vessel pressure wave height and of time variation tendency. CONSTITUTION:A first region below a minimum opening movement pressure Pb-delta considering a scattering delta of normal opening movement pressure of a pressure discharge plate 4 and a second region above it and below the maximum opening movement pressure Pb+delta are set for a closed vessel 1. For another closed vessel 2, Ca. 80% pressure (3rd) of the pressure wave height reached by the opening of the pressure discharge plate 4 at pressure Pb-delta and a pressure region (4th) over this pressure are set. A system is so constituted as to indicate the time trend of pressures P1 and P2 in the vessels 1 and 2 for a specified time period for the positive or negative of the pressure ca. 10sec after equalizing the pressures P1, P2 due to the opening of the pressure discharge plate 4. By using the combinations of the first to the fourth pressure regions and the trend of time variation, the opening of the pressure discharge plate 4 can be judged. |
