Instrument Tee
What are Instrument Tees?
Instrument tees are T-shaped fittings that allow a fluid line to split into two or merge from two lines into one. These fittings are used in pressure and flow monitoring systems to enable sampling, redirection, or sensor integration in the flow path.
Asiad Steel Industries is a dependable supplier of precision-engineered instrument tees, offering robust construction, excellent sealing properties, and compatibility with demanding system designs.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Tube OD / Thread Size | 1/16” to 2” (1.5 mm to 50 mm) / Metric, NPT, BSPT, BSPP, ISO Threads |
| Pressure Ratings | Working Pressure | Up to 6000 psi (414 bar) depending on tube size & material |
| Burst Pressure | 2.5x – 4x working pressure (safety factor) | |
| Fitting Types | Instrumentation Fittings | Tee (Equal Tee, Reducing Tee, Male Branch Tee, Female Branch Tee, Male Run Tee, Female Run Tee) |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L |
| Alloy / Superalloy | Inconel 600/625/825, Monel 400/K500, Hastelloy C22/C276 | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Other Materials | Brass, Copper, Titanium (Grade 2, Grade 5) | |
| Standards & Certifications | ASME / ANSI | ASME B31.1, ASME B31.3 (Process Piping) |
| ASTM | ASTM A182, ASTM A479, ASTM B446 | |
| European Standards | DIN 2353 (Compression fittings), EN 10204 (Inspection Certificates) | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175/ISO 15156 | |
| Design Features | Wall Thickness | As per ASME/ASTM or customized |
| Connection Types | Double Ferrule Compression, Single Ferrule, NPT/BSP Threads | |
| Branch Configurations | Equal Tee, Reducing Tee, Branch Tee, Run Tee | |
| Tolerance | As per ASME / DIN instrumentation standards | |
| Coating & Surface Finish | Anti-Corrosion Coating | Rust Preventive Oil, PTFE |
| Surface Finish | Machined, Polished, Passivated, Electro-Polished | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Radiography (RT), Ultrasonic (UT), Dye Penetrant (DPT) | |
| Destructive Testing | Tensile, Hardness, Impact | |
| Leak Testing | Helium Leak Test, Bubble Test |
Dimensions
| Tube OD (in.) | Tube OD (mm) | Thread Size (NPT/BSP) | A (Length) mm | B (Height) mm | C (Run Length) mm | D (Across Flats, Hex) mm | Weight (Approx.) g |
|---|---|---|---|---|---|---|---|
| 1/8″ | 3.2 | 1/8″ NPT / BSP | 22 | 22 | 30 | 11 | 15 |
| 1/4″ | 6.4 | 1/4″ NPT / BSP | 28 | 28 | 38 | 14 | 28 |
| 3/8″ | 9.5 | 3/8″ NPT / BSP | 34 | 34 | 46 | 17 | 55 |
| 1/2″ | 12.7 | 1/2″ NPT / BSP | 40 | 40 | 55 | 22 | 90 |
| 5/8″ | 15.9 | 5/8″ UN / BSP | 44 | 44 | 62 | 24 | 125 |
| 3/4″ | 19.0 | 3/4″ NPT / BSP | 50 | 50 | 70 | 27 | 175 |
| 1″ | 25.4 | 1″ NPT / BSP | 60 | 60 | 82 | 36 | 290 |
| 1 1/4″ | 31.8 | 1 1/4″ NPT / BSP | 70 | 70 | 95 | 41 | 420 |
| 1 1/2″ | 38.1 | 1 1/2″ NPT / BSP | 80 | 80 | 110 | 50 | 620 |
| 2″ | 50.8 | 2″ NPT / BSP | 95 | 95 | 130 | 65 | 980 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 500 – 750 | MPa (Stainless Steel Grades 304/316) |
| Yield Strength | 200 – 450 | MPa |
| Hardness | 120 – 200 | HB (Brinell) |
| Elongation | ≥ 25 – 35 | % |
| Density | 7.9 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 50 – 100 | J (Charpy, temperature dependent) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 250 – 400 | MPa |
| Corrosion Resistance | Excellent in chloride, acidic, and alkaline environments | – |
| Thermal Conductivity | 14 – 16 | W/m·K |
| Coefficient of Thermal Expansion | 16 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 200 | HB |
| Surface Finish | Machined / Passivated / Polished | As per ASTM A967 |
| Connection Type | Double Ferrule Compression / NPT / BSP | – |
| Operating Temperature Range | -196 to 400 | °C (material-dependent) |
| Pressure Rating | Up to 6000 PSI | As per ASME / ISO 8434-1 |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
| Nitrogen (N) | — | — | ≤ 0.10 | ≤ 0.10 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
Applications of Instrument Tees
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Do you offer both equal and reducing tees?
What is the difference between a tube tee and a pipe tee?
Are tees pressure tested before delivery?
Can tees be used with double ferrule tube fittings?
