Just for insulating instrument impulse lines ( hydrocarbon- Class 1 Div 1 or 2) without the heat trace, I wouldlike to know the most cost effective and fit for purpose cold weather insulating materials and solutions. Any text or source of reference on that?

 

Why are you insulating 'only', without a heat source? Has that worked in the past?

Impulse lines are dead headed so there's no flow as a source from which heat can keep the impulse lines 'at temperature'. Heat conductivity through stainless steel is pretty poor, so any length of tubing will cool to ambient within a short distance from whatever the root valve is attached to.

 

Why are you insulating 'only', without a heat source? Has that worked in the past?

Impulse lines are dead headed so there's no flow as a source from which heat can keep the impulse lines 'at temperature'. Heat conductivity through stainless steel is pretty poor, so any length of tubing will cool to ambient within a short distance from whatever the root valve is attached to.

Hi
To answer your counter query:
Heat tracing most applications - as needed of course. However there are instances where because of the insulated process line, the process temperature itself and the relatively short impulse line connection, it is expected that the process heat will keep the impulse line from freezing. Yes it has worked in the past by at times just extending the process line insulation.