Coaxial

Coaxial Tubing

Definition: A tube-in-tube system, where an inner tube is concentrically aligned within an outer tube, separated by a controlled gap. Purpose: Provides two isolated flow paths within the same assembly, commonly used for simultaneous transfer of different media.

Applications:

• Heat Transfer: Inner tube carries process fluid, outer tube carries cooling/heating medium.

• Sampling & Analysis: Protects or isolates sensitive samples from contamination.

• Cryogenics & Vacuum Systems: Inner flow path insulated by vacuum or purge gas in the annulus.

•  Gas Purging / Shielding: Inner tube for process gas, outer annulus for shielding or purge gas (common in welding and high-purity applications).

•  Medical / Pharmaceutical: Dual-fluid delivery with separation in compact form.

Coaxial Fittings

Definition: Specialized connectors that maintain concentric alignment of inner and outer tubes, ensuring leak-tight separation between the two flow paths.

Features:

• Dual-seal design (independent seals for inner and outer flow paths).

• Available in compression, welded, or custom-engineered versions.

• Materials: Stainless steel, nickel alloys, or high-purity grades depending on service.

Applications:

• Integration into orbital welding setups (e.g., purge gas and weld wire delivery in coaxial fashion)

• Instrumentation systems where both sample and carrier gas need to be delivered simultaneously.

• High-purity / semiconductor processes where contamination-free dual flow is critical.

• Industrial gas systems requiring safe, compact dual-channel transport.

1. Orbital Welding & Fabrication

• Application: Inner tube delivers purge gas, outer annulus supplies shielding or cooling gas.

• Benefit: Ensures high-quality welds with reduced contamination and consistent gas coverage.

• Industries: Semiconductor, aerospace, nuclear, pharmaceutical, food & beverage.

2. Semiconductor & High-Purity Systems

• Application: Dual-path delivery of process gases and purge gases in ultra-clean environments.

• Benefit: Prevents cross-contamination and maintains ultra-high purity standards.

• Use Case: Wafer fabrication, thin-film deposition, microelectronics manufacturing.

3. Pharmaceutical & Biotech

• Application: Sterile transfer of dual streams (e.g., product and buffer, gas and liquid).

• Benefit: Compact, hygienic assemblies reduce contamination risks.

• Use Case: Cleanroom piping, sterile filling systems.

4. Aerospace & Defense

• Application: Delivery of fuel/coolant or purge/pressurization gases in one assembly.

• Benefit: Saves weight and space while ensuring separation of critical media.

• Use Case: Rocket propulsion systems, jet engines, high-performance welding.

5. Food & Beverage

• Application: Dual delivery of CO₂ and nitrogen for carbonation and preservation, or gas/liquid in sanitary piping.

• Benefit: Compact, sanitary systems that maintain product integrity.

• Use Case: Beverage carbonation, sterile packaging, process welding.

6. Energy (Nuclear, Oil & Gas, Power Gen)

• Application: Coaxial lines used for purge gas and sampling during welding, as well as heat transfer in high-stress environments.

• Benefit: Supports precision welding in safety-critical systems.

• Use Case: Nuclear piping welds, refinery shutdowns, subsea systems.

✅ In short: Coaxial tubing and fittings provide dual-flow capability in a compact, leak-tight design, making them invaluable in industries where purity, safety, space savings, and weld quality are non-negotiable.