Tank Sight Glass type 1205 | Noris

Noris Type 1205 – Manhole Cover with Integrated Sight Glass

The Noris Type 1205 is a manhole or inspection cover equipped with an integrated sight glass. It is specified where both vessel access and direct visual inspection are required, eliminating the need for a separate sight glass opening. The design is compatible with DIN 28120 installation practices.

Operating Conditions

• Nominal sizes: DN 150 to DN 800
• Operating pressure: as agreed with manufacturer (application-dependent)
• Operating temperature: 150 °C or 280 °C (selectable)
• Applications: hand hole, inspection flange, manhole service opening
• Sight glass: borosilicate (DIN 7080) or soda-lime (DIN 8902)

Materials and Options

Base and cover are available in carbon steel or stainless steel. Welded base flanges, safety sealing systems per DIN 28121, wiper assemblies, spray systems, and integrated sight glass luminaires are available as options.

Typical Applications

• Process tanks requiring periodic internal inspection
• Mixing vessels where observation of foaming, level, or deposits is necessary
• Silos or closed vessels with maintenance access requirements
• Installations where minimizing vessel penetrations is critical for mechanical integrity

Selection Criteria

Type 1205 is selected when manhole access and visual inspection must be combined in a single assembly. Specification should include DN, design pressure, temperature, body material, glass type, sealing requirements, and need for wiper, spray, or lighting options.

FAQ

Is this a standard tank sight glass?
No. It is an inspection cover with integrated sight glass, not a standalone sight glass fitting.

Is an actuator required?
No actuator is needed for the sight glass itself. Any spray system is controlled by an external valve.

What is checked during maintenance?
Inspection includes glass, gaskets, bolts, sealing surfaces, hinges or opening mechanisms, and signs of leakage after thermal cycling.