Instrument Tubing and Fitting

Impulse sensing lines are the lines containing process fluid which run between the sensing instruments and process tapping points, and are usually made of tubing/piping, valves and tube fittings.so tubing is one of major things that used along with the instruments.

The fundamental difference between pipe and tube is the dimensional standard to which each is manufactured.A tube is a hollow product of round or any other cross section having a continuous periphery. Round tube size may be specified with respect to any two, but not all three, of the following: Outside diameter, inside diameter, wall thickness. Dimensions and permissible variations (tolerances) are specified in the appropriate standard specifications.

Generally tubing is specified by giving O.D. and wall thickness whereas pipes are specified by giving nominal diameter & wall thickness.