the simplest instance you will have some connection to the process.
This might be a flanged spool or a weld-o-let in the line. You will
have a sample probe and a shut-off or isolation valve so that the
probe can be inserted and removed without shutting down the process.
If the tubing between the sample point and the analyzer must be
heat traced and insulated then the connection and isolation valve
must be traced and insulated as well. Depending upon your ambient
conditions a gap as small a 1/4" can create a failure condition.
many cases wet insulation is worse than no insulation because it
gives a false sense of security."
are many cases where it is advisable to precondition the sample
before transporting it. The most common preconditioning done at
the tap is to adjust the pressure. For a gas sample this is done
to reduce the lag time of transport while liquid samples are sometimes
vaporized at the extraction point and transported as a gas.
and Heat Tracing the Sample Connection
insulation is worse than no insulation and sample transport bundles
need to be sealed completely and protected from the elements. A variety of heat shrink boots, sealants and jacket patch kits
are required for complete weatherproofing.
shrink boots are available in a variety
of sizes and configurations.
insulation containing water soluble chlorides can cause accelerated
stress corrosion of stainless steel and result in process leaks.
selection and installation of power connections and terminations
with correct electrical code approvals is another critical aspect
of the sample transport system. There are serious safety and performance issues with these
details and OBrien Analytical are The industry experts in
both the design and installation of these critical components.