Tubing with built in heat trace tape

[Tom Jenkins]

I am working on a system mounted outdoors in a cold climate. I need some flexible tubing, about 3/8" ID, for air less than 1 psi above atmospheric. The air is moist and frost is possible.

I can put heat trace tape on standard tubing, of course. However, I think I have seen instrument tubing with built in heat trace tape. I've searched the web a little, and found stuff that would work, but the configuration isn't as clean as the item I think I remember.

Any suggestions?

 

[Calistodwt]

Samuel Moore used to make composite tubing bundles

 

[keithkyll]

You didn't mention the ones you don't like.
Watlow. Thermon. Swagelok.

Complete and pricy:
http://www.store.cleanair.com/heated-sample-line-2/