Hard copper using silfoss for the joints, copper tubing using flare connections, and screwed black iron pipe. You should hire a Journeyman gas fitter and get a permit for any gas work done as if there is a problem, it won't be covered by your insurance!!!!
A light pipe is a type of tube that is used to disperse or shift light.Light pipe can be used to send natural sunlight into a building they can be used to create artificial light within any type of structure.
Gas that is natural.
The elbow is a hinge type joint, so it will flex and extend with minimal rotation.
That completely depends on the length of the pipe.
implied line
natural gas line
Sleeving, or relining. It depends on the type of application.
A light pipe is a type of tube that is used to disperse or shift light.Light pipe can be used to send natural sunlight into a building they can be used to create artificial light within any type of structure.
Coated Copper Pipe that is approved for underground only.
Earthquake
Possibly the same reason it has a blue line in the USA to show it is compatible to type L tubing used for domestic water supply.
Cast Iron
Depends on what type of vent system water heater has.
ASTM D1785 does NOT approve that pipe for use with natural gas - PVC schedule 40 / 80 / 120 is approved for use of pressurized liquids ONLY. The ONLY plastic (type) pipe approved for Natural Gas above ground is "Polyethyline" pipe "PolyPipe" that uses special heat sealed fittings. (ANSI 58 / ASTM D2513)
It's a type of pipe
Copper pipe is soldered. Steel pipe is welded. Plastic pipe (pvc) is glued. There is even a type of pipe that is smoked...
Parallel lines--will never touch Perpendicular lines--cross at right angles Rays--lines that start at a point and extend into infinity Line segment--a line between two points Line--a line that runs forever in either direction