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base frame
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carbon steel Q235; stainless steel 304 or 316, Titaniumor alternative
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seal
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Graphite composite gasket、PTFE
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sight glass plate
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borosilicate glass
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cover frame
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steel Q235; stainless steel SS304,SS316 or alternative
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securing bolts
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carbon steel or stainless steel A4
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working temperature
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≤200℃
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working pressure
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≤150PSI
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Weld‑on Circular Vessel Sight Glass
Weld‑on circular vessel sight glass is directly welded onto vessel walls for real‑time visual inspection of internal medium status, reaction, liquid level and foam condition.
Typical equipment for application
‑ Chemical & petrochemical reactors, pressure vessels
‑ Mixing tanks, storage tanks, agitators
‑ Dryers, separators, evaporators
‑ Pharmaceutical processing vessels
‑ Food & beverage reaction tanks
‑ Silos and other process containers
Pressure & temperature rating (standard borosilicate glass DIN7080)
‑ Working pressure: 0.6‑1.6 MPa (6‑16 bar), pressure drops as sight glass diameter increases; high‑pressure customized version is available
‑ Working temperature:‑20 ℃ ~ +280 ℃. With mica protection sheet, short‑term temperature can reach 300 ℃. Quartz glass for special high‑temperature service up to 900 ℃.
Notes
Actual pressure‑temperature performance depends on glass thickness, gasket material, flange material and size. Larger viewing diameter brings lower allowable working pressure.
