How to find the right Industrial Metal Tubing AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Industrial Metal Tubing
- Alloy for the environment
- 304 stainless is fine for general use. Choose 316 for chlorides, salt air or harsher chemicals. Copper suits water and refrigerant. Aluminum suits light structural or low-pressure air. The molybdenum in 316 resists pitting where 304 corrodes.
- Temper for compression fittings
- Use fully annealed tubing that is softer than the fitting, within the hardness limit the fitting maker publishes. Hard tubing will not deform properly under the ferrule and leaks.
- OD, wall and pressure
- Specify true OD and wall, then confirm the working pressure from the maker's chart for that OD, wall and material. Wall thickness, not diameter alone, determines the pressure rating.
- Seamless vs. welded
- Seamless or welded-and-drawn tubing to a stated ASTM spec (such as A269 for stainless) suits pressure and instrument work. Plain welded tube is acceptable for low-pressure or structural use. A stated spec guarantees chemistry, tolerance and testing that unbranded tube lacks.
- Copper type
- ACR copper is sized by actual OD for refrigeration. Plumbing Type K, L or M is sized nominally, with wall thickness decreasing from K to M. The two sizing systems take different fittings and tools.
Brands that matter
- Swagelok: Publishes the tubing hardness, wall and pressure tables its fittings depend on.
- Parker: Instrumentation fittings with published compatible-tubing specs.
- Mueller Industries (Streamline): Copper plumbing and ACR tubing.
- Cambridge-Lee: Copper tube for plumbing and HVAC.
What to avoid
- Stainless tubing with no grade or ASTM spec stated
- Mixing tubing and fittings from different makers on high-pressure or gas lines without confirming compatibility
- Using 304 near saltwater or in chloride-bearing fluids
Questions
Is 1/2 inch copper 1/2 inch across?
Not for plumbing: 1/2 in nominal Type L or M has a 5/8 in OD. ACR 1/2 in is 1/2 in OD.