Sight glass for industrial applications Type 322

for vesselsmonitoringfor chemicals

The Type 322 circular container sight glass is a heavy-duty flange-mounted fitting designed for visual monitoring of liquid and gaseous media in high-pressure applications up to 160 barg. It combines reinforced flanges, oversized borosilicate sight glass plates and pre-tensioning screws to ensure sealing reliability at elevated pressures and temperatures.

Design & purpose
The fitting is intended for direct visual process control on tanks and vessels where high operating pressure and increased temperature resistance are required. It is executed for flange mounting similar to DIN 28121 and adapted for demanding process environments.

Key construction elements

• Cover flange
• Glass cushion
• Sight glass plate (borosilicate glass by default, oversized compared with DIN 7080)
• Gasket
• Base / carrier flange
• Screws and pre-tensioning screws for glass clamping

Options / protective features

• LED lighting for illuminated viewing (available)
• Mica protection disc for additional thermal/steam protection
• FEP or Halar® coating to protect glass against aggressive chemicals or caustics
• Spraying devices and wipers: not possible for Type 322 due to high operating pressure
• Custom designs and adaptations available on request

Technical data and dimensions

• Nominal sizes (DN): 40, 50, 80, 100
• Nominal pressure (PN): 40, 63, 100, 160
• Temperature options (glass/seal depending on execution): 80 °C, 130 °C, 150 °C, 175 °C, 180 °C, 200 °C, 280 °C, 300 °C
• Quick overview:
  • Maximum working pressure: up to 160 barg
  • Heat resistance: up to 300 °C (depending on glass and sealing)
  • Media: suitable for liquid and gaseous media
  • Nominal diameters: DN 40–100
  • Accessories available; custom designs possible
• Dimensions (selected values from cross-section table):
  • DN / Di [mm]: DN 40 → Di 40; DN 50 → Di 50; DN 80 → Di 80; DN 100 → Di 100
  • H (PN 40) [mm]: 84 / 84 / 84 / 104 (for DN 40 / 50 / 80 / 100)
  • H (PN 63) [mm]: 84 / 84 / 84 / 104 (for DN 40 / 50 / 80 / 100)
  • H (PN 100) [mm]: 84 / 104 / 104 / 104 (for DN 40 / 50 / 80 / 100)
  • H (PN 160) [mm]: 94 / 104 / 104 / 121 (for DN 40 / 50 / 80 / 100)
  • Da [mm]: according to DIN EN 1092-1

Characteristics / technical specifications

• Model / type: Type 322 (circular sight glass fitting)
• Mounting: flange mounting similar to DIN 28121
• Nominal diameters: DN 40, DN 50, DN 80, DN 100
• Nominal pressure ratings: PN 40, PN 63, PN 100, PN 160 (max. 160 barg)
• Temperature resistance: up to 300 °C depending on glass and seal selection
• Glass: borosilicate glass by default (oversized beyond DIN 7080); mica protective disc option for extreme conditions
• Corrosion/chemical protection: optional FEP or Halar® coating
• Sealing / clamping: pre-tensioning screws for glass tensioning
• Accessories & options: LED lighting, mica discs, coatings, custom designs
• Manufacturer / Brand: ACI Industriearmaturen