believe it or not sometimes in certain situations its safer if they are alight . You know that its being burnt and not entering somewhere and getting to explosive limits .The glove was used to stop any dirt going into the dead part of the pipe in case they needed to connect it back. On the live side of the pipe we used a yellow end cap fitting I luckily had lying around. But gas pressure is very low, I think it is like 60 mbars before the gas meter compare this with 2 - 4 bar in water pipes, a factor of 30+. The workmen said when you light it up it only produces a 50 cm flame. At that point I did ask him to put his cigarette out.
We managed to pour the foundations today. Under the live gas pipe.
Attended a few were we have had to say to fire brigade damp down around it but leave it lit .