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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities <br />Table B-1. <br />Pressure Conversions for Different Units <br />The pressures readings in RP1200 are given in pounds <br />per square inch gauge pressure (psig). Use Table B-1 to <br />convert psig to pressures in different units. <br />PSIG <br />Inches Hg <br />Mbar <br />(gauge <br />pressure) <br />gar (gauge <br />pressure) <br />0 <br />0 <br />0 <br />0 <br />1 <br />2.0 <br />69 <br />0.07 <br />2 <br />4.1 <br />138 <br />0.14 <br />3 <br />6.1 <br />207 <br />0.21 <br />4 <br />8.1 <br />276 <br />0.28 <br />5 <br />10.2 <br />345 <br />0.34 <br />6 <br />12.2 <br />414 <br />0.41 <br />7 <br />14.3 <br />483 <br />0.48 <br />8 <br />16.3 <br />552 <br />0.55 <br />9 <br />18.3 <br />620 <br />0.62 <br />10 <br />20.4 <br />689 <br />0.69 <br />11 <br />22.4 <br />758 <br />0.76 <br />12 <br />24.4 <br />827 <br />0.83 <br />13 <br />26.5 <br />896 <br />0.90 <br />14 <br />28.5 <br />965 <br />0.97 <br />15 <br />30.5 <br />1034 <br />1.03 <br />16 <br />32.6 <br />1103 <br />1.10 <br />17 <br />34.6 <br />1172 <br />1.17 <br />18 <br />36.6 <br />1241 <br />1.24 <br />19 <br />38.7 <br />1310 <br />1.31 <br />20 <br />40.7 <br />1379 <br />1.38 <br />21 <br />42.8 <br />1448 <br />1.45 <br />22 <br />44.8 <br />1517 <br />1.52-- <br />23 <br />46.8 <br />1586 <br />1.59 <br />24 <br />48.9 <br />1655 <br />1.65 <br />25 <br />50.9 <br />1724 <br />1.72 <br />26 <br />52.9 <br />1792 <br />1.79 <br />27 <br />55.0 <br />1861 <br />1.86 <br />28 <br />57.0 <br />1930 <br />1.93 <br />29 <br />59.0 <br />1999 <br />2.00 <br />30 <br />61.1 <br />2068 <br />2.07 <br />Inches Hg = inches of mercury <br />mbar x millibars <br />-0.055 <br />-23 <br />Table B-2. <br />Vacuum <br />Conversions <br />for <br />- Inches <br />Different <br />Water <br />Units <br />Column <br />Use Table B-2 for converting vacuum readings in "inches <br />water column" to other units. <br />Inches <br />Water <br />Column <br />Inches <br />Hg <br />PSIG <br />Mbar <br />(gauge <br />pressure) <br />Bar <br />(gauge <br />pressure) <br />0 <br />0 <br />0 <br />0 <br />0 <br />-1 <br />0.07 <br />-0.04 <br />-2.5 <br />-0.002 <br />-2 <br />0.15 <br />-0.07 <br />-5.0 <br />-0.005 <br />-3 <br />0.22 <br />-0.11 <br />-7.5 <br />-0.007 <br />-4 <br />0.29 <br />-0.14 <br />-9.9 <br />-0.010 <br />-5 <br />0.37. <br />-0.18 <br />-12.4 <br />-0.012 <br />-0 <br />0.44 <br />-0.22 <br />-14.9 <br />-0.015 <br />-7 <br />0.52 - <br />-0.25 <br />-17.4 <br />-0.017 <br />-8 <br />0.59 <br />-0.29 <br />-19.9 <br />-0.020 <br />-9 <br />0.66 <br />-0.32 <br />-22.4 <br />-0.022 <br />-10 <br />0.74 <br />-0.36 <br />-24.8 <br />-0.025 <br />-11 <br />0.81 <br />-0.40 <br />-27.3 <br />-0.027 <br />-12 <br />0.88 <br />-0.43 <br />-29.8 <br />-0.030 <br />-13 <br />0.96 <br />-0.47 <br />-32.3 <br />-0.032 <br />-14 <br />1.03 <br />-0.51 <br />-34.8 <br />-0.035 <br />-15 <br />1.11 <br />-0.54 <br />-37.3 <br />-0.037 <br />-16 <br />1.18 <br />-0.58 <br />-39.8 <br />-0.040 <br />-17 <br />1.25 <br />-0.61 <br />-42.2 <br />-0.042 <br />-18 <br />1.33 <br />-0.65 <br />-44.7 <br />-0.045 <br />-19 <br />1.40 <br />-0.69 <br />-47.2 <br />-0.047 <br />-20 <br />1.47 <br />-0.72 <br />-49.7 <br />-0.050 <br />-21 <br />1.55 <br />-0.76 <br />-52.2 <br />-0.052 <br />-22 <br />1.62 <br />-0.79 <br />-54.7 <br />-0.055 <br />-23 <br />1.69 <br />-0.83 <br />-57.2 <br />-0.057 <br />-24 <br />1.77 <br />-0.87 <br />-59.6 <br />-0.060 <br />-25 <br />1.84 <br />-0.90 <br />-62.1 <br />-0.062 <br />-26 <br />1.92 <br />-0.94 <br />-64.6 <br />-0.065 <br />-27 <br />1.99 <br />-0.97 <br />-67.1 <br />-0.067 <br />-28 <br />2.06 <br />-1.01 <br />-69.6 <br />-0.070 <br />-29 <br />2.14 <br />-1.05 <br />-72.1 <br />-0.072 <br />-30 <br />2.21 <br />-1.08 <br />-74.5 <br />-0.075 <br />-31 <br />2.28 <br />-1.12 <br />-77.0 <br />-0,077 <br />-32 <br />2.36 <br />-1.16 <br />-79.5 <br />-0.080 <br />-33 <br />2.43 <br />-1.19 <br />-82.0 <br />-0.082 <br />-34 <br />2.50 <br />-1.23 <br />-84.5 <br />-0.084 <br />-35 <br />2.58 <br />-1.26 <br />-87.0 <br />0.087 <br />pei.org 4) <br />