Biggest Pipe in Pipe

[FilippoT]

Hi,
what is the biggest size of Pipe in Pipe currently insstalled?

 

[RVAmeche]

Are you asking what's the biggest primary pipe that can be installed a carrier pipe for secondary containment purposes?

 

[LittleInch]

You need to be more specific about"pipe in oipe"

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[FilippoT]

Pipe in Pipe is the technology that include an inner pipe + insulation + carrier outer pipe.
Inner pipe is for pressure containement and fluid transportation, while insulation and outer pipe are used to reduce heat exchanges for deep water application.
As far as i know, PiP maximum size is 14"OD x 18" OD.

 

[Artisi]

So what is your question?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[RVAmeche]

I've never heard anyone just call it "Pipe in Pipe" in industry, but okay.

One of the main things you need to look at are elbows or changes in direction. For example, while a 4" straight pipe fits nicely inside a 6" straight pipe, a 4" 90 does not fit inside a 6" 90.

If you're trying to provide secondary containment for a large OD pipe, double wall piping probably isn't the most cost effective solution.