This might include having a designated contact to call in case of an emergency. http://pezedium.free.fr/?a%5B%5D=%3Ca+href%3Dhttps%3A%2F%2Fcommunity.umidigi.com%2Fhome.php%3Fmod%3Dspace%26uid%3D1307482%3Enatural+gas+system+design%3C%copyright%3E%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttps%3A%2F%2Fsciencewiki.science%2F+%2F%3E