A coaxial tube combines a process-gas tube with an outer containment tube. The inner and outer sizes must be selected as a pair, with compatible terminations and inspection access. The white-background cutaway is an illustrative view of the tube family; confirm actual construction on the project drawing.
Technical parameters
| Arrangement | Inner process tube plus outer containment tube |
|---|---|
| ASTM inner sizes | 1/4–2 in in the catalog |
| JIS inner sizes | 10A–32A in the catalog |
| ASTM example | 1/2 in inner tube with 3/4 in outer tube |
| Example wall | Inner 0.039 or 0.049 in; outer 0.065 in for the 1/2 in example |
| Listed lengths | 4,000 or 6,000 mm for the 1/2 in example |
Catalog dimensions are selection references. Confirm the exact grade, finish, geometry and inspection documents against the approved order drawing.
Application and selection
Consider this family when a gas-system design calls for double containment around the process line. The annular space, monitoring approach, joint design and local safety requirements must be defined by the responsible engineering team.
What to send for a quotation
Send the gas hazard assessment, inner/outer size pair, wall requirements, termination drawing, planned monitoring method and project length. Contact LGF with your requirements.
Explore the UHP stainless steel tubing and fittings range or review laboratory gas piping design guidance.
Product and process images
