Cleanroom Utility Systems

High-Purity Gas Tubing

Seamless electropolished 316L stainless tubing with a smooth controlled bore, square weld-ready ends and protected clean packaging for compatible high-purity gas distribution.

Electropolished 316L high-purity flow path
Square ends prepared for controlled orbital welding
Protected handling from cleaning through installation

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Product Introduction

High-Purity Gas Tubing forms the clean metallic flow path between gas-source equipment, distribution headers and process tools. The selected catalogue basis is seamless UNS S31603 stainless tube with a 6.35 mm outside diameter, 0.89 mm wall and 0.25 µm Ra maximum electropolished internal surface. Straight 6096 mm lengths reduce unnecessary field joints while square prepared ends support repeatable orbital butt welding. After final cleaning, the bore is dried, both ends are capped and each tube is protected for controlled handling. The product is supplied as unassembled tubing without fittings, valves, regulators, gauges, supports or a fabricated route.

Key Features

Seamless 316L construction avoids a longitudinal weld seam in the selected small-bore configuration

Electropolishing smooths the gas-contact surface and reduces sites that can retain installation residue

Controlled sulfur chemistry options support consistent fusion behavior during qualified orbital welding

Square prepared ends help maintain alignment and a uniform weld gap at tube-to-tube joints

Long straight lengths can reduce the number of field welds needed across a distribution route

Low-carbon stainless metallurgy provides a practical balance of corrosion resistance and weldability

Heat and material traceability can be maintained from received tube through fabricated spool records

Protective caps isolate the cleaned bore during transport, storage and cleanroom staging

Fractional and metric outside diameters support gas sticks, valve boxes, tool hookups and submains

Optional enhanced metallurgy and surface grades allow the tube specification to match more demanding media

Customer Product Concerns

A clean tube is only one part of a high-purity gas path; material compatibility, received condition, storage, cutting, welding and purge control determine whether the installed line preserves its intended cleanliness.

Open or damaged tube ends can admit particles and ambient moisture before installationKeep the original caps and bags sealed until controlled staging, then inspect and re-cap every cut length immediately.

An incorrect diameter or wall can create unacceptable pressure drop or mechanical marginSize outside diameter and wall from gas demand, route length, pressure, temperature and the governing piping design basis.

Poor end preparation can cause orbital-weld misalignment, oxidation or internal discontinuitiesUse dedicated clean cutting and facing tools, verify squareness and apply a qualified weld and internal-purge procedure.

Mixing heat lots without control can break material traceability across fabricated spoolsTransfer heat identification to cut sections and link each installed spool to its receiving and fabrication records.

A smooth electropolished bore can still be contaminated by dirty tools, gloves or storage racksSegregate UHP fabrication tools and staging areas, use clean handling controls and prevent contact with carbon steel.

Standard 316L may not suit every corrosive, reactive or moisture-sensitive gas conditionReview gas composition, impurities, temperature and upset conditions before selecting metallurgy, finish and joining method.

Typical Applications

Semiconductor bulk and specialty-gas distribution between source cabinets, valve boxes and process toolsPhotovoltaic, display and LED production equipment using controlled high-purity process gasesAnalytical and research laboratories routing carrier, zero, calibration and support gasesPharmaceutical and biotechnology utility lines where a clean compatible stainless flow path is selectedHigh-purity inert-gas purging for fabrication, packaging and controlled-atmosphere equipmentOEM gas boxes and process skids requiring weldable small-bore stainless interconnections

Technical Parameters

The selected display basis follows one common Swagelok-class seamless UHP straight tube at 6.35 mm OD x 0.89 mm wall and 6096 mm nominal length, with a 0.25 µm Ra maximum electropolished bore. The site's fixed ten-row schema uses panel-oriented labels; here Panel Thickness identifies the tube wall and Steel Facing Thickness identifies the absence of a separate facing layer. Final pressure, temperature, gas compatibility, cleaning grade, melt route, documentation and weld procedure must match the intended service.

Core Material	Seamless UNS S31603 / 316L stainless steel tubing to an ASTM A269-class dimensional basis; VIM-VAR metallurgy available where specified
Panel Thickness	0.89 mm nominal tube-wall thickness for the selected 6.35 mm OD straight-tube configuration
Effective Width	6.35 mm nominal outside diameter for the selected catalogue display basis
Maximum Length	6096 mm nominal straight supply length before clean cutting, facing and orbital welding
Steel Facing Thickness	0 mm separate facing; the pressure boundary is the single 0.89 mm 316L tube wall
Core Density	Approximately 8000 kg/m³ representative density for annealed 316L stainless steel
Thermal Conductivity	Approximately 15 W/(m·K) near 20°C for representative 316L stainless steel
Surface Finish	Natural-silver clean exterior with an electropolished internal surface at 0.25 µm Ra maximum for the selected UHP basis
Joint Type	Square-cut tube butt ends prepared for qualified autogenous orbital welding; compatible face-seal transitions may be added at planned service points
Customization	Available based on the intended application and operating environment.

Available Options

Fractional outside diameters from compact instrument tubing through larger distribution sizesMetric outside diameters for regional equipment and fabrication standardsAlternative wall thicknesses selected for pressure, temperature and handling loadsStandard-melt or VIM-VAR 316L metallurgy according to the cleanliness specificationElectropolished internal surface grades down to tighter roughness limits where requiredStraight stick, long continuous coil or coaxial containment formatsChemical cleaning, passivation, DI-water rinsing and filtered-nitrogen drying levelsIndividual capping, double bagging and cleanroom packaging controlsMaterial, dimensional, surface and cleanliness documentation packages

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