Difference between Jacketed piping and Insulated piping system

[Timeyin]

Hi,
Generally my idea of a jacketed piping system is one protected by an insulating cover. Typically used for the transportation of hot steam or hot water, a jacketed pipe maintains the temperature of the material flowing through it. The jacketed pipe used in large pipelines prevents the harsh elements outside from turning the oil inside from becoming so thick that it can no longer flow through the pipeline.
I was just wondering if any one would like to share their thoughts on the difference between a jacketed piping system and an insulated piping system.
Are there actually any differences or are they the same.
Would there be any difference when analyzing both using Caesar II.

 

[LittleInch]

There is no strict definition and they can be used interchangeably, but in normal parlance a jacketed piping system implies that there is an annulus which is filled with some sort of heating medium - steam or water as in "steam jacketed pipe" - something like this

http://simpleengineeringarticles.wordpress.com/2013/05/16/steam-jacketed-process-line/

Insulated implies only a passive insulation, although it can also be used with a heating system - usually electric trace heating of some kind.

Hence they are not the same.

Analysis will depend on whether the pipe can be heated before burial and how the jacket is fixed to the main pipe. As both will heat up and expand, but only the outer pipe is in contact with the soil for a buried line, how the internal pipe expands and contracts can get interesting.


My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[pennpiper]

Timeyin,
Go here (

http://www.csiheat.com/products/jacketed_piping/standard_jacketed_piping.aspx

)
to see a good definition of "Jacketed Pipe".

prognosis: Lead or Lag

 

[Timeyin]

Thanks. You guys have so helpful.
However it seem to me that HDPE (high density polyethylene) is used in both cases.
Are there material specification differences for both the pipe jacket and the insulation material?

 

[LittleInch]

who said anything about HDPE?. Jackets pipes are nearly always steel, insulation can be many things with or without an outer waterproof layer, for which PE is a very good covering layer. The spec needs to match the temperature and the conditions.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[Timeyin]

Awesome.
Thanks alot.