Figure 6.
Panel a plots elapsed time from about 950 to 980 days. The left vertical axis gives S T P flow rate in cubic metres per second and the right vertical axis gives gas pressure in kilopascal. Gas pressure increases from about 1800 kilopascal to about 5600 kilopascal, then decreases to about 5200 kilopascal. Flow into the system increases from about 1800 kilopascal equivalent conditions to about 4200 kilopascal before stopping near 975 days. Flow into the buffer remains low before rising sharply to about 3.8 times 10 to the negative 8 cubic metres per second, then decreases rapidly. Panel b plots elapsed time from about 1745 to 1805 days. Gas pressure increases from about 5000 kilopascal to about 5900 kilopascal, then decreases and stabilises near 5600 kilopascal. Flow into the system remains nearly constant at about 6.0 times 10 to the negative 9 cubic metres per second. Flow into the buffer peaks near 3.5 times 10 to the negative 8 cubic metres per second before decreasing and stabilising near 8.0 times 10 to the negative 9 cubic metres per second. Panel c plots elapsed time from about 3160 to 3235 days. Gas pressure increases from about 4850 kilopascal to about 6200 kilopascal, then decreases gradually to about 5900 kilopascal. Flow into the system remains close to 5.0 times 10 to the negative 9 cubic metres per second. Flow into the buffer peaks near 2.2 times 10 to the negative 8 cubic metres per second and then stabilises near 6.0 times 10 to the negative 9 cubic metres per second. Panel d plots elapsed time from about 5229 to 5259 days. Gas pressure increases from about 4800 kilopascal to about 6400 kilopascal, then decreases to about 5900 kilopascal and later rises slightly to about 6000 kilopascal. Flow into the system remains near 3.0 times 10 to the negative 8 cubic metres per second. Flow into the buffer peaks near 2.3 times 10 to the negative 7 cubic metres per second before decreasing and stabilising near 3.0 times 10 to the negative 8 cubic metres per second.Comparison of gas entry behaviour for the four tests conducted in canister filter FL903: (a) Gas Test 1; (b) Gas Test 2; (c) Gas Test 4; (d) Gas Test 6