TC Union
What are TC Unions?
TC Union (Tri-Clover Union) is a sanitary connection consisting of a clamp, two ferrules, and a gasket to form a leak-proof joint between pipelines. These unions are used in industries where hygienic, tool-free, and quick disconnection is necessary for line cleaning or modification. Their modular design and smooth finish prevent product contamination and ensure a high level of cleanliness.
Asiad Steel Industries supplies high-quality TC Unions engineered to meet the rigorous demands of modern process industries.
Key Features
Leak-Proof
Jointing
Sanitary
Design
Easy to
Clean
Standards
Compliant
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | ½” to 48” (DN15 – DN1200) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600, 900, 1500, 2500 |
| PN Ratings | PN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 |
| Fitting Types | TC Union | Tri-Clover / TC Union Clamp |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Standards & Certifications | ASME / ANSI | ASME B16.9 (Butt Weld), ASME B16.11 (Socket Weld & Threaded), ASME B16.28 (Short Radius Elbows & Returns) |
| ASTM | ASTM A234, ASTM A403, ASTM B366 | |
| European Standards | DIN 2605, DIN 2615, DIN 2616, EN 10253 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Design Features | Wall Thickness | As per ASME B36.10 (CS), ASME B36.19 (SS), customized options |
| End Connections | Beveled Ends, Plain Ends, Threaded, Socket Weld Ends | |
| Tolerance | As per ASME/ANSI standards | |
| Coating & Surface Finish | Anti-Corrosion Coating | Rust Preventive Oil, Black Oxide, Hot-Dip Galvanized |
| Optional Coatings | Epoxy, PTFE, Polyurethane | |
| Surface Finish | Machined, Pickled, Polished, Passivated | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Radiography (RT), Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT) | |
| Destructive Testing | Tensile, Hardness, Impact |
Dimensions
| Nominal Pipe Size (NPS / DN) | Outer Diameter (OD) of Tube (mm) | ID of Union End (mm) | Clamp Diameter (mm) | Gasket OD (mm) | Gasket Thickness (mm) |
|---|---|---|---|---|---|
| ½” / DN15 | 21.3 | 19.0 | 50 | 28 | 2 |
| ¾” / DN20 | 26.9 | 23.0 | 55 | 33 | 2 |
| 1″ / DN25 | 33.7 | 30.0 | 60 | 40 | 2 |
| 1½” / DN40 | 48.3 | 44.0 | 70 | 54 | 2 |
| 2″ / DN50 | 60.3 | 56.0 | 80 | 66 | 2 |
| 2½” / DN65 | 73.0 | 68.0 | 90 | 78 | 3 |
| 3″ / DN80 | 88.9 | 83.0 | 100 | 93 | 3 |
| 4″ / DN100 | 114.3 | 108.0 | 120 | 118 | 3 |
| 5″ / DN125 | 141.3 | 134.0 | 140 | 145 | 3 |
| 6″ / DN150 | 168.3 | 160.0 | 160 | 172 | 3 |
| 8″ / DN200 | 219.1 | 210.0 | 200 | 224 | 3 |
| 10″ / DN250 | 273.0 | 260.0 | 250 | 278 | 3 |
| 12″ / DN300 | 323.9 | 310.0 | 300 | 328 | 3 |
| 14″ / DN350 | 355.6 | 342.0 | 350 | 360 | 3 |
| 16″ / DN400 | 406.4 | 390.0 | 400 | 412 | 3 |
| 18″ / DN450 | 457.0 | 440.0 | 450 | 462 | 3 |
| 20″ / DN500 | 508.0 | 490.0 | 500 | 514 | 3 |
| 24″ / DN600 | 610.0 | 592.0 | 600 | 618 | 3 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 485 – 750 | MPa (Carbon Steel, Stainless Steel, Alloy Steel) |
| Yield Strength | 170 – 450 | MPa |
| Hardness | 120 – 200 | HB (Brinell) |
| Elongation | ≥ 20 – 30 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 70 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 250 – 450 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel) | – |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 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 | Polished / Passivated / Machined | – |
| Clamp Type | Tri-Clover / Sanitary | – |
| Operating Temperature Range | -46 to 200 | °C (material-dependent) |
| Pressure Rating | Class 150, 300, 600, 900 | ASME BPE / DIN Standards |
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 TC Union
Dairy & Food Processing
Units
Beverage Plants
Pharmaceutical
Cosmetic & Personal
Care
Chemical & Enzyme
Production
Laboratory and Testing
Facilities
Do you have questions?
What makes TC unions ideal for sanitary applications?
Are TC unions available in 316L stainless steel?
Do you offer gaskets with TC unions?
Can TC unions be customized for large-diameter pipes?
