It is not very hard at all. You can find a list of gas plumbers on the following site: http://www.thecityofaustin.com/plumbers/index.html.
To test a pressurerized gas line apply soapy water to all connections. You will see bubbles appear if there are leaks. I see plumbers do this at the houses I work on.
A copper pipe is the preferred choice of many plumbers for water lines. A PVC pipe is very versatile also though, and is another favorite amongst plumbers when dealing with water lines.
We specialize in installing urinals or acid waste systems or medical gas lines or fire suppression piping or storm water recycling or steam / hydronic systems
plumbers, i think
Yes they work for base engineering
I think you are referring to the magnets you attach to gas lines in a car. They don't work.
You open the gas cap and this will depressurize the gas lines.
No but they do need a permit to work on the property.
Normally union journeymen plumbers
Install in previous spot , with out new gas piping I'd charge $150 in Washington DC area.
Plumbers can have many aspects to their jobs depending on whether they work as a residential plumber or a commercial plumber. Generally, they focus on repairing plumbing.