You can make a purge plug that will allow you to purge a much smaller area then a 5ft length of pipe/tube.ONDGAS wrote:Sooooooo then one may ask how do you properly purge pipe if there is still air in it?
Make a plug that is a little bigger then the ID so it will go in with a little force, this way you know it will stay in place and not fall over. You can push the plug to within 10" or so of the weld, thus greatly reducing the volume you need to purge Here is a simple plug I made recently to purge an internal volume using aluminum foil.