Most large cities today pipe solid wastes to sewage treatment plants in order to separate and partially purify the water, before emptying into streams or other bodies of water. For potable water use, galvanized iron piping was commonplace in the United States from the late 1800s until around 1960. After that period, copper piping took over, first soft copper with flared fittings, then with rigid copper tubing utilizing soldered fittings.
The difference between pipes and tubes is simply in the way it is sized. PVC pipe for plumbing applications and galvanized steel pipe for instance, are measured in IPS (iron pipe size). Copper tube, CPVC, PeX and other tubing is measured nominally, which is basically an average diameter. These sizing schemes allow for universal adaptation of transitional fittings. For instance, 1/2" PeX tubing is the same size as 1/2" copper tubing. 1/2" PVC on the other hand is not the same size as 1/2" tubing, and therefore requires either a threaded male or female adapter to connect them. When used in agricultural irrigation, the singular form "pipe" is often used as a plural.[19]
It does help in regards to procedures and rules in order to better understand your options.  Obviously cost is always an issue and the size of the company probably determine the labor cost.  That is why some times people take chances with "others' hoping that there have good experience but because they are independent operators there pricing might be more flexible.
Although plumbers, pipefitters, and steamfitters perform three distinct and specialized roles, their duties are often similar. For example, they all install pipes and fittings that carry water, steam, air, or other liquids or gases. They determine the necessary materials for a job, connect pipes, and perform pressure tests to ensure that a pipe system is airtight and watertight. Their tools include drills, saws, welding torches, and wrenches.

I want to thank Technician Sean D. and his associate Paul C. for during an outstanding job replacing some of my plumbing. They arrived on job site at the time promised and quickly determined my problem. They were both very friendly and professional. Sean was very knowledgeable as to what had to be done and made a good job an excellent job with a few tweaks. Atomic Plumbing is lucky to have employees of this caliber.

Plumbing Repair Co