Tank Sight Glass type W | Mei

Tank Sight Glass MEI Type W

The MEI Type W is a circular sight glass for tanks and pipelines, designed for welded installation on vessel shells or process lines. It is used for local visual inspection of flow, liquid level, color, foaming, media clarity, or presence of solids. This device is not intended for continuous level measurement.

Technical Specifications

• Connection: welding assembly / mount solder
• Sizes: DN 50 to DN 200
• Body: AISI 316L stainless steel
• Sealing: PTFE
• Glass: toughened soda-lime, borosilicate optional
• Temperature: up to 130 °C with soda-lime, up to 250 °C with borosilicate
• Construction: fully disassemblable for maintenance
• Tested glasses available on request

Dimensions and Installation

Available in DN 50, 65, 80, 100, 125, 150, and 200. Number of bolt holes: 4 for DN 50–80, 8 for DN 100–200. Outer flange diameter D ranges from 165 mm to 340 mm depending on DN.

Selection Criteria

Type W is selected where a welded circular sight glass in stainless steel is required, with PTFE sealing and full disassembly for cleaning or glass replacement. For temperatures above 130 °C, borosilicate glass must be specified. Operating pressure is not listed in available data and must be confirmed per DN and application prior to ordering.

Typical Applications

• Tanks for food, beverage, and chemical processing
• Liquid lines requiring visual flow confirmation
• Mixing vessels with foaming or deposits
• Pipelines where media clarity or color change must be monitored

FAQ

Is an actuator required?
No. This is a static inspection component.

When is borosilicate glass selected?
For temperatures up to 250 °C or where increased thermal resistance is needed.

What is checked during maintenance?
Glass, PTFE seal, bolts, sealing surfaces, and signs of leakage after thermal cycles.