4" ANSI Sightglass Flanges

ANSI Sightglass flanges generally bolt below the Liquip balance mechanism in terminal systems and provide the ability to view product in the pipework to determine if a loading arm has product present or if it has been drained.

  • 4” 150# flange bolt pattern.
  • 40mm thick.
  • Flange is 228mm (9") O.D.
  • Each sight glass is date stamped.
  • Provides visual identification of product.

Maximum working pressure
1,000 kPa.

Maximum working temperature



API-SG-150: ANSI flange pattern, 40mm thick.


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