A statue of Danielle in front of the Texas and United States flags.

Recommended Minimum Evacuation Distances for Natural Gas Pipeline Leaks and Ruptures (Not applicable for Butane, Propane, or other Hazardous Liquids) Pipeline Size (inches) Pressure (psig) 4 6 8 10 12 16 20 22 24 30 36 42 100   91   137   182   228 274 365 456 502 547 684 821 958 200  129 193 258 322 387 516 645 709 774 967 1161 1354 300  158 237 316 395 474 632 790 869 948 1185 1422 1659 400  182 274 365 456 547 730 912 1003 1094 1368 1642 1915 500  204 306 408 510 612 816 1020 1122 1224 1529 1835 2141 600  223 335 447 558 670 894 1117 1229 1340 1675 2011 2346 700  241 362 483 603 724 965 1206 1327 1448 1810 2172 2534 800  258 387 516 645 774 1032 1290 1419 1548 1935 2322 2709 900  274 410 547 684 821 1094 1368 1505 1642 2052 2462 2873 1000  288 433 577 721 865 1154 1442 1586 1730 2163 2596 3028 1100  302 454 605 756 907 1210 1512 1664 1815 2269 2722 3176 1200  316 474 632 790 948 1264 1580 1738 1896 2369 2843 3317 1300  329 493 658 822 986 1315 1644 1809 1973 2466 2959 3453 1400  341 512 682 853 1024 1365 1706 1877 2047 2559 3071 3583 1500  353 530 706 883 1060 1413 1766 1943 2119 2649 3179 3709 1600  365 547 730 912 1094 1459 1824 2006 2189 2736 3283 3830 1700  376 564 752 940 1128 1504 1880 2068 2256 2820 3384 3948 1800  387 580 774 967 1161 1548 1935 2128 2322 2902 3482 4063 1900  398 596 795 994 1193 1590 1988 2186 2385 2981 3578 4174 2000  408 612 816 1020 1224 1631 2039 2243 2447 3059 3671 4283 2100  418 627 836 1045 1254 1672 2090 2299 2508 3134 3761 4388 2200  428 642 856 1069 1283 1711 2139 2353 2567 3208 3850 4492   Table 1 - Evacuation Distance in Feet The applicable leak or rupture condition is that of a sustained trench fire fueled by non-toxic natural gas escaping from two full bore pipe ends. Blast overpressure is not addressed. The distances in Table 1 correspond to a thermal heat flux exposure level of 450 Btu/hr. This is the accepted limit of heat exposure for unprotected outdoor areas where people congregate; as established by the US Department of Housing & Development Code 24CFR51, Subpart C, Siting of HUD Assisted Projects Near Hazardous Operations Handling Conventional Fuels or Chemicals of an Explosive or Flammable Nature. The formula used to calculate distance was taken from the Gas Research Institute Report GRI-00/0189, A Model for Sizing High Consequence Areas Associated with Natural Gas Pipelines, 2001, prepared by C-FER Technologies. That model does not take into account wind or other factors which may greatly influence specific conditions. Users are advised that the distances shown in Table 1 are considered to be “general information” only and are not intended to replace a site specific risk analysis. The Pipeline Association for Public Awareness makes no warranty with respect to the usefulness of this information and assumes no liability for any and all damages resulting from its use. Anyone using this information does so at their own risk.