Copper tubing is generally furnished in two hardnesses one is hard
drawn . This is available in 20 foot straight lengths and needs
annealed to deform by chasing. The other is annealed and comes in
coils. Tubing is also available in different wall thicknesses .
These are designated as
M, L , K and drain pipe. Straight tubing , like most pipe is
designated in size by the ID of a standard type (type K). The outside
diameter is then actually 1/8" larger than the nominal size 1-5/8"
for 1-1/2" nominal size. and 2-1/8" for 2" nominal size I assume you
want the straight stuff and in 1’ 1/1-1/4 1-1/2 or 2" nominal size.
probably in M (thinnest) or L type. The tubing is made by various
concerns and is more or less all the same quality. You would want
the standard grade not ACR , refrigeration, or Oxy grades. These just
mean special cleaning and end caps and cost more. Buy where you get
the best deal . in NYC check out Metalferrrous at 34 W. 46th street.
You should become familiar with the sites. particularly start at the
forums and projects sections. http://www.artmetal.com/brambush/
The copper org site is down now for? check it occasionally — it
should be back.
Since you are apparently in NYC Super instruction is easily
available to you at The Valentin Yotkov studio in Brooklyn.
email@example.com 718-852-8640 His reputation is magnificent.
Ask more questions.