Dear friends,
Sometimes when I open a shell and tube evaporator, I see pipes such as my sent photo attachment to help oil return to suction of compressor.
But as you know in A/C system as result of high suction pressure oil returns to comp. easily.
Anyway do you agree to install these pipes inside of shell & tube evaporators ? Or they do not do important job ?

Sincerely yours.
اواپراتور شل ان&#1.jpg