Instrumentation tubing is used to connect various instruments in the industries like pressure gauges, pressure switches, valves, etc.
The tubing surface is ESSENTIAL to sealing when using a compression fitting, hence good handling practices should be used to reduce scratches and protect surface finish.
For example dragging tubing across any surface that could scratch its surface can cause real corrosion and sealing problems. On offshore facilities, scratches may lead to corrosion of 316SS tubing from salt water pitting.
Visual Inspection of Tubing
It is a good idea to visually inspect instrument tubing to ensure it is free from scratches and other damage.
Severe scratches or damage to tubing could affect the safe installation of the compression fitting. It is recommended that tubing in poor condition should be disposed of.
Finished tubes should be scratch free, reasonably straight and have smooth ends free of burrs.
When cutting tubing do not use a hacksaw, the correct tool is a tube cutter which has a sharp blade.
Using the correct deburring tool (usually found on the cutter), deburr both the inside and outside edges of tube ends.
It is recommended that instrument tubing is cleaned with dry instrument air, however where the service requires a high level of cleanliness a proprietary cleaning agent should be used.