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Instrumentation Tubes

Stainless Steel Precision Tubes for Instrumentation, Control Lines & High-Purity Fluid Systems

Inox Steel India is a leading manufacturer, stockist, and exporter of Instrumentation Tubes conforming to ASTM A269 (larger OD precision SS tubes) and ASTM A632 (small-diameter SS & nickel alloy instrumentation tubing). These tubes are designed for high-purity, high-precision, and corrosion-critical environments, ensuring reliable performance in control systems, measurement lines, chemical dosing systems, pneumatic circuits, and offshore subsea control lines.

Instrumentation tubes must deliver:

  • Tight dimensional tolerance
  • High corrosion resistance (chlorides, acids, seawater, chemicals)
  • Smooth internal surface (clean-bore finish)
  • Reliable bending & flaring performance
  • Absolute leak-tight integrity

Our tubes are supplied in: Bright Annealed (BA) finish, Cleaned & Passivated, Coiled or straight lengths, Orbital welding compatible, and OD tolerance class: ±0.05 mm or as specified.

Table of Contents

Understanding ASTM A269 & ASTM A632 Standards

🔹 ASTM A269 — Stainless Steel Seamless/Welded Instrumentation TubesBest for: Medium-size precision tubing used in instrumentation, hydraulic & pneumatic control.

Grades: TP304 / TP304L, TP316 / TP316L (most common), TP321 / TP347.

Used in: Instrumentation panels · Hydraulic lines · Gas sampling · Steam lines.

🔹 ASTM A632 — Small Diameter Stainless Instrumentation TubesBest for: High-purity, small OD control lines & sensitive instrumentation systems.

Grades: SS 304 / 304L, SS 316 / 316L, Nickel Alloys (Inconel 625/600, Monel 400).

Used in: Panel instruments · Chemical dosing · Oxygen/nitrogen gas lines · Offshore umbilicals.

Where Instrumentation Tubes Are Used

Process Industries

  • Oil & Gas (Upstream, Midstream, Refinery)
  • Petrochemicals & Chemical Process Plants
  • Offshore Platforms & FPSO Units
  • Power Plants (Thermal, Nuclear)

Specialized Systems

  • Pharmaceutical & Biotech
  • Food & Beverage CIP/SIP systems
  • Marine & Subsea Systems
  • OEM Hydraulic/Pneumatic Panels

Typical applications include: Pressure gauges, Flow transmitters, Level controls, Pneumatic control valves, Chemical injection lines, Steam trace lines, Analyzer shelters, and Hydraulic instrumentation.

Manufacturing Process — Instrumentation Tubes

Manufacturing Steps:

  1. Cold Drawing / Cold Rolling: Achieves tight tolerance & uniform mechanical strength.
  2. Bright Annealing (BA Furnace): Ensures clean ID, low carbon, corrosion resistance.
  3. Pickling & Passivation: Removes scale & impurities for “clean-bore” finish.
  4. ID/OD Polishing: Ensures smooth internal surface for accurate flow.
  5. Coil-forming (optional): For long continuous control lines.
  6. NDT Testing: Eddy current + hydrotest ensure leak-free performance.

Why Our Instrumentation Tubes Stand Out

  • Clean-bore, contamination-free ID
  • Tight tolerance for ferrule & compression fittings
  • BA (Bright Annealed) + EP (Electropolished) finish options
  • Coil & Straight lengths available
  • 316L & Nickel alloys for corrosion-critical environments
  • Full traceability, MTC 3.1/3.2

Applications & Technical Specifications of Instrumentation Tubes

Instrumentation tubes are used for precise fluid control, measurement, sampling, and transmission lines in industries where accuracy, reliability, and corrosion resistance are critical. These tubes must perform under high pressure, corrosive media, and vibration.

Applications by Standard / Media / Industry

🔹 ASTM A269 – Medium OD Instrumentation Tubes (6 mm to 50 mm OD)

Application Media Industries
Impulse Lines Steam · Gas · Liquid Oil & Gas · Power Plants
Hydraulic Instrumentation Hydraulic Oil Machinery · Industrial Plants
Gas Sampling Lines Natural gas · Oxygen · Nitrogen Analyzer Shelters
Panel Tubing Air · Nitrogen Process Control Panels
Steam Trace Tubing Saturated steam Thermal Power

Why A269? Excellent weldability + strong corrosion resistance + precise tolerance.

🔹 ASTM A632 – Small Diameter Precision Tubes (1.59 mm to 12.7 mm OD)

Application Media Industries
Chemical Injection Lines Acids · Dosing chemicals Petrochemical
Oxygen/Nitrogen Service High-purity gases Pharma · Lab
Analyzer Tubing Sample liquids & gases Refinery · Chemical
Pneumatic Control Lines Air Automation
Offshore Umbilical Tubes Seawater · Injection chemicals Offshore & Subsea

Why A632? Ultra-smooth ID + excellent corrosion resistance + coil availability.

Dimensional Range (General)

ASTM A269

  • OD: 6 mm – 50.8 mm
  • WT: 0.8 mm – 4.0 mm
  • Length: Straight 6M · 12M

ASTM A632

  • OD: 1.59 mm – 12.7 mm
  • WT: 0.20 mm – 2.11 mm
  • Length: Coils (up to 1000m) or straight

Finishes: Bright Annealed (BA), Annealed & Pickled, Cleaned + Passivated, Electropolished. Forms: Straight, Coils, U-bent.

Indicative Price Range — 2025 (INR + USD)

Standard Grade Price (INR/kg) Price (USD/kg) Typical Use
ASTM A269 304/304L ₹250 – ₹350 $3.30 – $4.60 General instrumentation
ASTM A269 316/316L ₹280 – ₹420 $3.50 – $5.35 Corrosion-critical control
ASTM A632 316/316L ₹320 – ₹490 $4.00 – $6.00 High-purity & small OD
Nickel Alloys (A632) 625/600/400 ₹1,500 – ₹3,200 $18 – $38 Offshore & critical chemical

 Prices vary based on OD, WT, coil length, BA/EP finish, and TPI requirement.

Testing & Quality Assurance

Mechanical Tests

  • Tensile / Yield test
  • Hardness test
  • Flare, flattening, flange

Purity Tests

  • Clean-bore inspection
  • Hydrocarbon-free clean
  • ID roughness (Ra)

Non-Destructive Tests

  • Eddy current (EC)
  • Hydrostatic test
  • Pneumatic leak test

Dimensional & Certs

  • OD / WT tolerance
  • EN 10204 3.1 / 3.2
  • TPI: SGS · BV · TUV

Engineering Notes (For Instrumentation & Control Designers)

  • Grade Selection: 316/316L for best corrosion resistance; 304/304L for economy; Nickel alloys for offshore/subsea.
  • Surface Finish: Clean-bore & passivated ID is required; BA finish is best for purity and smoothness.
  • Coil vs. Straight: Coils for long circuits and offshore umbilicals; Straight for impulse lines and panels.
  • Fittings: Compatible with Swagelok, Parker, Gyrolok, Ermeto, and A-LOK.
  • Bending: Small OD tubes are excellent for orbital welding and tight-radius bends.

Instrumentation Tube Supplier Near Alankar Cinema, Mumbai — Inox Steel India

Inox Steel India is a trusted manufacturer and stockist of Instrumentation Tubes near Alankar Cinema, Mumbai, supplying precision stainless steel tubes as per ASTM A269 (medium OD) and ASTM A632 (small OD, high-purity). Our tubes are designed for instrumentation panels, impulse lines, analyzer systems, chemical dosing lines, pneumatic control loops, and offshore umbilical systems.

Our instrumentation tubes offer: Tight OD/ID tolerance (±0.05 mm), Smooth, clean-bore inner surface, Excellent corrosion resistance in aggressive media, Perfect compatibility with ferrule/compression fittings, High reliability under vibration, pulsation & continuous service, and BA / EP finish for ultra-clean applications. We supply tubing for critical control, measurement, and automation systems used by leading process industries across India and worldwide.

Why Choose Inox Steel India for Instrumentation Tubes?

  1. Clean-Bore ID + Bright Annealed (BA) Quality: Ideal for analyzer shelters, Oxygen/Nitrogen lines, and chemical injection.
  2. Tight Tolerance for Leak-Free Fittings: Works perfectly with Swagelok, Parker, Gyrolok, A-LOK, and Ermeto.
  3. Coil & Straight Length Options: Coils up to 1000 meters for offshore & subsea; Straight 6M/12M for panel tubing.
  4. Full Material Range: SS 304/304L, SS 316/316L (most demanded), and Nickel alloys (Inconel/Monel).
  5. Industry Specific Certifications: EN 10204 3.1 / 3.2, Cleanliness certificate, BA furnace report, and TPI-approval.

Industries & Applications Served

Industry Common Applications
Oil & Gas (Onshore/Offshore) Analyzer lines · Control lines · Chemical injection
Refinery & Petrochemical Impulse lines · Pressure transmitters
Power Plants Steam & water impulse tubing
Pharmaceutical & Biotech High-purity gas lines (N2, O2)
Chemical Dosing Systems Small OD metering lines
Automation & Pneumatics Instrument air lines
Water Treatment Plants Chlorination & dosing tubes
Marine & Subsea Umbilical & control lines

Packaging & Export Handling

Instrumentation tubing requires cleanliness, corrosion protection, and precision handling.

Packaging Includes

  • Individual tube end caps and Clean-bore plastic sealing.
  • HDPE wrapping and Coils wrapped with anti-static film.
  • Wooden reel packaging for long coils.
  • Bundle ID tags + traceability stickers.

Marking & Shipping

  • Marking: ASTM A269 / A632 · Grade · OD × WT · BA / EP finish.
  • Ports: JNPT Mumbai | Mundra Port | Hazira Port.
  • Handling: FCL / LCL, Air freight for urgent orders.

Get a Quick Instrumentation Tube Quote

For BA/EP stainless steel instrumentation tubes in coils or straight lengths, speak with our technical team today.

Inox Steel India

52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004

Email

alloy@inoxsteelindia.in, steel@inoxsteelindia.in

Phone

+91 9930796690

 Frequently Asked Questions (FAQs)

ASTM A269 is most commonly used, while ASTM A632 is selected for small-diameter or high-precision applications.

Yes. ASTM A269 and A632 welded tubes are specifically designed for instrumentation and control service.

Proper OD tolerance ensures leak-free sealing with compression fittings and stable signal transmission.

Inox Steel India supplies clean-bore instrumentation tubes as per ASTM A269 and A632. SS 304/316L & nickel alloy precision tubes for control lines, analyzer systems, and offshore umbilicals. Exporter to GCC, Europe, Africa & USA.

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