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Normally union journeymen plumbers
Yes, the European union has a plumbing standard.
Plumbing contractors who are unionized can be contacted by reaching out to the local plumbing union in your area or by checking on plumbing contractors in the white pages.
A union
Same as all other plumbing in civilized countries
Shut off the water supply, get a fire extinguisher and then disassemble the union and unsweat it
Not necessarily, depends what and where plumbing work is to be done. Check with local plumbing authority about needing license or not. Sometimes you need license to pull permits to do plumbing work. Plumbers usually have at least a journeyman's license.
Just to be trained by a plumber or serve as an apprentice with the plumbers union.
There are many plumbing repair businesses in New Jersey that claim quality work at reasonable costs. In Newark, for example, there are: Neri & Russo Services, serving all of Northern New Jersey; and Rich`s Plumbing Heating & Air Conditioning, serving Union County and surrounding areas of NJ.
The only plumbing work that you are allowed to perform without a license is for your own property.
Plumbing trade schools are often found at local community colleges and sometimes vocational high schools. Another place to find plumbing trade schools is through the local plumbers union.
A plumbing union is used to make it easy to disconnect two sections of pipe. Soldering the union shut would defeat this purpose, and it would be more economical to use an ordinary coupling if there is no intention of disconnecting the pipes.