Can anybody Pls Explain what is the difference between HOT, COLD and SAFETY Insulations

Go here:

http://www.energymanagertraining.com/eq ... nTypes.pdf

And read about different Insulation materials.

Basic] to 4" [100mm] or more) is applied to the whole line to retain heat. Flanges and valves are not normally insulated for heat retention.
Safety Insulation (normally only 1" [25mm] ) is only applied to a hot line where an operator (or some other passer-by) might touch the line and get burned. The rest of the hot line is not insulated at all. A flange or valve may be insulated depending on the degree of risk.
Cold insulation when required is applied to all surfaces of the pipe system (pipe, fittings, flanges, valves, etc.) including any element in contact with the pipe system such as a Dummy Support or a Base Support to a distance four times the thickness of the cold insulation.

Thank You JOP
As per Your Reply (and my search) I can understand following-
1. Safety insulation is similar to Personnel Protection.
2. Hot insulation means where we want to resist the heat loss from Pipe to Environment (e.g. for steam sevice, or input ot reactors etc.).
3. Cold Insulation is when we want to prevent heat flow from environment to Pipe (e.g. for cryogenic services, LNG etc.).

Is it so.
Waiting for your response

Siddharth Jain

1 Yes, Insulation for Safety (IS) and Insulation for Personnel Protection (IP) are the same thing. It is the choice of the Engineering company or the Client what they want to call it. There is no right or wrong.
2 Yes. Insulation for Heat (IH) conservation is intended to retain heat and is used by itself and with various types of Heat Tracing (Steam, Hot water, Hot Oil, Glycol, etc.
3 Yes, Insulation for extreme low temperature (IC) as you have stated is for Cryogenic systems

Thank You 11echo for this update.
Have you used this type of Insulation?

Thank You
Siddharth Jain

We've switched here at the Exxon Mobil refinery I work at to Pyrogel insulation for hot and cold applications. Its very thin I think 1/4" thick Pyrogel replaces 1.5" of traditional insulation.....or something like that. It saves a ton of space.

I worked for an LNG plant where we used both cold & acoustic insulation for the cryogenic service lines. We could somewhere cut the acoustic insulation as per our need (like if have some clashing, welding problem, supporting problem). I remembered, while routing the three typical compressor piping we had a very tight layout over the piperack & one elbow was clashing with the steel. Then we put a note on the iso that “field to cut the acoustic insulation only”.