PDA

View Full Version : Insulating hot gas lines







learningnh3
26-07-2012, 09:53 PM
Hi Everyone,

I was hoping you guys can help:

Is it common to insulate hot gas lines in industrial NH3 systems? A little bit of back ground, +25F/85F
NH3
Liquid Recirc


THANKS!

Segei
27-07-2012, 05:25 AM
It depends. Defrost hot gas line should be insulated. Hot gas line between compressors and condensers shouldn't.

Rob White
27-07-2012, 08:57 AM
.

It does depend on what the hot gas line is used for.

Where is the hot gas going and will you still need it to be
hot when it gets there?

If you are using the hot has for defrost purposses or for
heat recovery then it would be recomended to insulate the
pipe, if the pipe is the discarge from the compressor to the
condenser then usualy no, do not lag the pipes.

Regards

Rob

.

Mark
27-07-2012, 09:45 AM
Insulating the discharge line is sometimes specified where there is a risk of burns.

Rob White
27-07-2012, 10:13 AM
Insulating the discharge line is sometimes specified where there is a risk of burns.

Thats correct and also if the condensers are remote to the
compressor the discharge is insulated to prevent the
discharge gas de-superheating before it gets to the condenser.

Regards

Rob

.

Segei
27-07-2012, 04:14 PM
i don't think that desuperheating is bad. Actually, it helps to reduce heat rejection that required by the condenser. However, hot gas condensation in the discharge line is bad and insulation can help.

THE DUDE
01-09-2012, 12:24 AM
Defrost lines with the chance of condensing refrigerant should be to prevent Shock when a defrost started.