Our Products
Weld Neck Vessel Sight Glass
The Weld Neck Vessel Sight Glass is designed for direct welding installation on tanks, reactors, pipelines, and process vessels. Featuring a welded neck connection and high-strength transparent window, it provides reliable visual monitoring under pressure, vacuum, and elevated temperature conditions.
Non binding • Usually a response within 24 hours
Certified quality
Technical data
Weld Neck Vessel Sight Glass for Tanks, Pipelines and Process Equipment
The Weld Neck Vessel Sight Glass is a robust inspection window specifically designed for welded installation on industrial vessels, reactors, storage tanks, and process pipelines. The weld neck connection provides superior mechanical strength and excellent sealing integrity, making it suitable for demanding industrial environments.
This sight glass assembly allows operators to observe fluid flow, liquid levels, product color, mixing conditions, and process reactions without interrupting production. The direct welded connection eliminates additional flange joints, reducing potential leakage points and improving system reliability.
Manufactured from high-quality stainless steel and equipped with premium transparent viewing materials, the Weld Neck Vessel Sight Glass offers excellent resistance to pressure, vacuum, corrosion, and temperature fluctuations.
Glass options include DIN 7080 borosilicate glass, fused quartz glass, sapphire glass, and tempered safety glass, allowing the sight glass to meet a wide range of industrial operating conditions.
The product is widely used in chemical processing, pharmaceutical manufacturing, petrochemical facilities, food and beverage production, biotechnology plants, water treatment systems, and energy industries.
Weld Neck Vessel Sight Glass— Technical Data
| Parameter | Value / Standard |
|---|---|
| Execution Standard | DIN 28120 / DIN 28121 (weld-neck / weld-on flanged) |
| Nominal Sizes | DN 40 / 50 / 80 / 100 / 125 / 150 / 200 |
| Pressure Rating | PN 10 / PN 25 standard — custom up to 70 MPa on request |
| Glass Material | Borosilicate 3.3 (DIN 7080) / Tempered Soda-Lime (DIN 8902) / Specialty glass on request |
| Temperature Range | Up to +280°C (borosilicate) — higher temperature glass available on request |
| Body / Flange Material | Carbon Steel RSt37-2 / Stainless Steel 1.4571 / 1.4541 / 304 / 316 |
| Gasket Options | KLINGERsil C-4400 / PTFE / Silicone / Corrugated ring seal (high PN) |
| Visible Diameter (d1) | 48 mm (DN40) to 150 mm (DN200) – see dimension table below |
| Quality Certificate | EN 10204-3.1 Material Certificate (standard) / 3.2 available on request |
| Connection Type | Weld-on base flange (pre-welded to vessel) + bolt-together cover flange assembly |
Weld Neck Vessel Sight Glass— Standard Dimensions
| Nominal Size (DN) | Visible Diameter (d1) | Glass Disc Diameter | Pressure Rating (PN) | Glass Standard |
|---|---|---|---|---|
| DN 40 | 48 mm | ~80 mm | PN 10 / 25 | DIN 7080 |
| DN 50 | 58 mm | ~95 mm | PN 10 / 25 | DIN 7080 |
| DN 80 | 82 mm | ~125 mm | PN 10 / 25 | DIN 7080 |
| DN 100 | 100 mm | ~150 mm | PN 10 / 25 | DIN 7080 |
| DN 125 | 120 mm | ~175 mm | PN 10 / 25 | DIN 7080 |
| DN 150 | 135 mm | ~200 mm | PN 10 / 25 | DIN 7080 |
| DN 200 | 150 mm | ~265 mm | PN 10 / 25 | DIN 7080 |
KEY FEATURES
Thermal Stability
High resistance to thermal shock for extreme temperature environments
Superior Corrosion Resistance
Available in SS304, SS316L, Duplex Stainless Steel, Hastelloy, and other special alloys.
Chemical Resistance
Stable performance in corrosive chemical environments
Reliable Leak-Tight Sealing
Precision-machined sealing surfaces combined with industrial-grade gasket materials ensure long-term sealing performance
Temperature Resistant Construction
Suitable for both low-temperature and elevated-temperature industrial processes.
Custom Design Support
OEM / ODM customization available
Custom Manufacturing Service
We provide tailor-made solutions according to drawings or technical requirements.
- Custom diameter
- Custom thickness
- Special pressure design
- Edge polishing
- Optical finishing
- OEM / ODM support
- Custom packaging
TYPICAL APPLICATIONS
- Pressure Vessels
- Chemical Reactors
- Boilers & Steam Systems
- Pipeline Sight Glass Assemblies
- Pharmaceutical Equipment
- Food & Beverage Processing
- Industrial Observation Ports
FAQ
A: A Weld Neck Vessel Sight Glass is a welded observation window installed directly onto tanks, vessels, or pipelines for visual process monitoring.
A:The weld neck design provides excellent mechanical strength, reduced leakage points, and long-term reliability in industrial applications.
A: Yes. The assembly can be designed for pressure-rated service according to operating requirements.
A: Yes. Custom diameters, neck lengths, pressure ratings, and material combinations can be supplied.
A: Yes. LED sight glass lights and explosion-proof illuminators can be integrated for improved visibility.
Need Custom Weld Neck Vessel Sight Glass Solutuions?
Send us your drawings or technical requirements for fast quotation and engineering support.