Industrial Sight Glasses
What are Industrial Sight Glasses?
An Industrial Sight Glass is a visual flow indicator installed in process pipelines or vessels that allows operators to observe the flow, clarity, and condition of liquids or gases. These transparent fittings provide real-time monitoring of fluid systems, helping detect leaks, contamination, blockages, or process abnormalities without system shutdown.
Asaid Steel Industries is a reliable Industrial Sight Glass supplier, offering durable, high-clarity units suitable for sanitary and high-pressure process environments.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
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 | – | PN6, PN10, PN16, PN25, PN40, PN64 |
| Types | Sight Glass Type | I.C Full View Sight Glass |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Standards & Certifications | ASME / ANSI | ASME B16.5, ASME B16.10 |
| ASTM | ASTM A240, ASTM A182 | |
| European Standards | EN 10204, DIN 28120 | |
| 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 |
| Viewing Area | Full View (transparent borosilicate glass) | |
| End Connections | Flanged, Threaded, Welded, Clamp 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) | Face-to-Face Length (L) mm | Flange Outer Diameter (OD) mm | Flange Thickness (T) mm | Bolt Circle Diameter (BCD) mm | Number of Bolts (N) | Bolt Size |
|---|---|---|---|---|---|---|
| ½” / DN15 | 100 | 140 | 16 | 105 | 4 | M12 |
| ¾” / DN20 | 110 | 150 | 16 | 115 | 4 | M12 |
| 1” / DN25 | 115 | 160 | 18 | 125 | 4 | M12 |
| 1¼” / DN32 | 125 | 180 | 18 | 145 | 4 | M12 |
| 1½” / DN40 | 140 | 190 | 20 | 155 | 4 | M16 |
| 2” / DN50 | 150 | 210 | 20 | 175 | 4 | M16 |
| 2½” / DN65 | 165 | 230 | 22 | 190 | 4 | M16 |
| 3” / DN80 | 180 | 250 | 22 | 210 | 4 | M16 |
| 4” / DN100 | 200 | 280 | 24 | 240 | 8 | M16 |
| 6” / DN150 | 250 | 340 | 26 | 295 | 8 | M20 |
| 8” / DN200 | 300 | 405 | 28 | 355 | 8 | M20 |
| 10” / DN250 | 350 | 460 | 30 | 410 | 12 | M20 |
| 12” / DN300 | 400 | 515 | 32 | 470 | 12 | M24 |
| 14” / DN350 | 450 | 570 | 34 | 525 | 12 | M24 |
| 16” / DN400 | 500 | 620 | 36 | 580 | 16 | M24 |
| 18” / DN450 | 550 | 670 | 38 | 635 | 16 | M27 |
| 20” / DN500 | 600 | 720 | 40 | 690 | 16 | M27 |
| 24” / DN600 | 700 | 840 | 44 | 800 | 20 | M30 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 485 – 620 | MPa (Stainless Steel, Borosilicate Glass components) |
| Yield Strength | 170 – 310 | MPa |
| Hardness | 120 – 200 | HB (Brinell, Stainless Steel body) |
| Elongation | ≥ 20 – 30 | % |
| Density | 7.8 – 8.0 | g/cm³ (Stainless Steel body) |
| Impact Toughness | ≥ 27 – 60 | J (Charpy, grade-dependent, body material) |
| Modulus of Elasticity (E) | ~200 | GPa (Stainless Steel) |
| Fatigue Strength | 250 – 400 | MPa |
| Corrosion Resistance | Excellent (Stainless Steel > Alloy Steel) | – |
| Thermal Conductivity | 15 – 50 | W/m·K (body) |
| Coefficient of Thermal Expansion | 3 – 5 ×10⁻⁶ / 11 – 17 ×10⁻⁶ | /°C (Borosilicate Glass / Stainless Steel) |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 200 | HB |
| Surface Finish | Machined / Polished (Stainless Steel), Smooth glass viewing surface | – |
| Assembly Type | Bolted Flange or Welded | – |
| Operating Temperature Range | -46 to 300 | °C (glass and body material-dependent) |
| Pressure Rating | PN6 – PN40 / Class 150 – 600 | ASME / ISO standards |
Weight
| Sight Glass Type | Size (inch) | Approx. Weight (kg) |
|---|---|---|
| Tubular Type | 1.5” | 1.2 |
| Circular Type | 2” | 1.8 |
| Double Window | 3” | 2.6 |
Applications of Industrial Sight Glasses
Construction &
Infrastructure
Power Generation &
Energy Sector
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the main use of an industrial sight glass?
Are sight glasses safe for high-temperature processes?
Can they be used in hygienic or sterile systems?
Does Asaid Steel Industries provide custom sight glasses?
