DIN 28120 Circular Flanged Sight Glass Fittings

John Moncrieff’s DIN 28120 circular flanged sight glass fittings are engineered for high-integrity process visibility in demanding industrial environments. Designed for welding into or onto vessel walls, these precision-built assemblies deliver exceptional mechanical strength, repeatable sealing performance, and long operational life.

Each unit is supplied as a complete assembly, incorporating the correctly matched seals and a robust circular sight glass disc securely clamped between the flange rings. The defined flange thickness mandated by DIN 28120 ensures accurate, distortion-free alignment—provided welding procedures are correctly followed—resulting in a reliable, leak-tight installation.

These sight glass fittings can be combined with a wide range of compatible sight glass luminaires, enabling use in both safe and hazardous area environments for illumination and inspection.

Specifications

• Nominal Sizes: DN 50 to DN 200 (viewing diameters: 80 mm to 225 mm)
• Pressure Rating: Up to 16 bar (size dependent; higher ratings available on request)
• Temperature Capability: Up to 280 °C depending on material; up to 900 °C with special configurations
• Material Options: Stainless steel, carbon steel, and speciality alloys such as Hastelloy
• Custom Builds: Available to meet application-specific dimensional or process requirements

Typical Applications

• Pressure vessels and reactors
• Mixers, separators, and processing tanks
• Chemical, petrochemical, and pharmaceutical production
• High-temperature and high-pressure process lines
• Systems requiring integrated illumination via sight glass luminaires

When your operation demands a fully compliant, high-performance viewing solution, John Moncrieff’s DIN 28120 circular flanged sight glass fittings deliver robust engineering, reliable sealing, and clear process visibility for mission-critical applications.

Technical Specifications: