The Pressure vessel Sight Glass with lamp flow indicator is designed to be welded directly onto a tank or other liquid-containing vessel, and allows visual observation of level, color, or clarity of a liquid in a vessel or tank at a low initial cost.
Standard Welding Flange Sight Window units are furnished with a flat bottom. Upon request, the unit can be machined with a cylindrical radius to match the contour of the vessel. The Sight Glass are available in single or multiple section types.
Our oblong units are designed for pressures up to 150psi and temperatures up to 450°F, and various materials of construction are available to meet your process needs.

Application:
For viewing the internals of pipelines, containers, pressure ves-sels, reactors, silos etc. used principally as a liquid level indicator.

base frame	carbon steel Q235; stainless steel 304 or 316, Titaniumor alternative
seal	Graphite composite gasket、PTFE
sight glass plate	borosilicate glass
cover frame	steel Q235; stainless steel SS304,SS316 or alternative
securing bolts	carbon steel or stainless steel A4
working temperature	≤200℃
working pressure	≤150PSI

Environments for Illuminated Vessel Sight Glass

1. Low-light / Dark working environments (core usage)

Underground tanks, closed dark workshops, night-shift production lines, basement storage vessels.

No natural light; built-in lamp brightens tank interior for clear observation of liquid level, bubbles, mixing state.

2. Sanitary & sterile production workshops

Food, beverage, dairy, pharmaceutical bioreactors, fermentation tanks, medicine blending vessels.

Polished stainless steel body, waterproof LED light, meets hygiene standards to check mixing, crystallization and liquid color.

3. Flammable & explosive chemical hazardous zones

Petrochemical, solvent, liquid ammonia storage tanks, reaction kettles.

Match explosion-proof lamp housing (DC24V safe voltage), avoid ignition risk from electric sparks.

4. High / medium temperature sealed pressure vessels

Chemical reactors, heat transfer oil tanks, evaporation pots.

High-temperature resistant borosilicate/quartz glass lamp version to observe boiling, stratification and scaling inside tanks.

5. Corrosive medium workshops

Pickling tanks, acid & alkali storage containers, wastewater treatment vessels.

PTFE lined illuminated sight glass resists weak/strong acid, alkali and salt media.

6. Outdoor all-weather facilities

Outdoor vertical storage tanks, waste heat recovery equipment.

IP65 waterproof & dustproof lamp unit, adapts rain, dust and day-night light difference.

7. Vessels with turbid, viscous or foamy media

Slurry mixing tanks, extraction separators.

Auxiliary light penetrates turbid liquid to see real internal working status.

Short English Summary

Illuminated sight glasses are applied in dim closed workshops, sanitary food/pharma sterile tanks, explosion-proof chemical hazardous areas, high-temp pressure vessels, corrosive acid-base workshops, outdoor tanks and turbid medium reactors, to solve poor visibility without natural light.

Pressure vessel Sight Glass with lamp flow indicator