Don't dis the trac pipe. It will outlast black any day and eliminate the transferrence of vibration from the furnace to the piping in the rest of the house. It is also metal from one end to the other. This was a problem with many of the hardware store gas flex connectors. Manufacturers directions on most gas furnaces recommend the use of a flexible connector for the final tie in.
My pledge brother's house in South County St. Louis is all copper gas pipe. When I explained to his father that it was not only illegal, but highly dangerous, he told me, "But every single house the contractor did in this subdivision is the exact same way." Oh yeah, they were all soldered joints, too.
I hope there is a fire house and hospital near by.
"We are what we repeatedly do.
Excellence, then, is not an act, but a habit." -Aristotle
copper is a fine gas vehicle.. but not hard copper and not sweat joints.. we use soft copper and flare joints all the time but inside the unit it must be changed to black iron. in a small fire the sweat joint will open and feed the fire with gas.
Always tell the truth and you never have to remember what you! said!
Copper can only be used with LP. Both sulfur and the odorant in natural gas cause oxidation in copper. It flakes off and clogs the screen in the valve. Worse it may get in the valve and prevent it from opening or closing properly. These problems are not present with LP. Its a completely different fuel.
new construction in minnesota all you will see is soft copper
for 2lb. runs and 6in runs very few contractors use anything
else new houses are are spahgetti runs just like the electrical
nothing pretty about it