Oil is a liquid, so fairly "easy" to detect and include, but pure gas requires pressure vessels and has no smell - so it can be hard to include and tough to detect leaks within the extraction process. http://[email protected]/suivi_forum/?a%5B%5D=gas+safety+checks+near+me+%28%3Ca+href%3Dhttps%3A%2F%2Fmaps.google.no%2Furl%3Fq%3Dhttps%3A%2F%2Fatavi.com%2Fshare%2Fwvqxb4zybxh3%3Evisit+your+url%3C%copyright%3E%29%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttps%3A%2F%2Fgpsites.win%2Fstory.php%3Ftitle%3Dnavigating-gas-security-regulations-in-london-7+%2F%3E