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Weld-on sight glass DN28120
for vesselsstainless steelcarbon steel

weld-on sight glass
weld-on sight glass
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for vessels, stainless steel, carbon steel, flange, weld-on

Max.: 225 mm
(8.9 in)

Min.: 80 mm
(3.1 in)

Operating temperature

Max.: 280 °C
(536 °F)

Min.: 0 °C
(32 °F)

Operating pressure

10 bar, 16 bar
(145 psi, 232 psi)


Weld-on sightglass fittings for the observation of the internals of pressure vessels, silos, gear-trains, separators, pipelines, etc. These sightglass units can be combined with light fittings for use in explosion hazardous areas and safe areas. The cover flanges can be drilled and tapped to take these light fittings. Sightglass fittings to DIN 28120 are circular flanged sets suitable for welding into or onto vessel walls, complete with relevant matching seals and sight glass disc set between the flange rings. Based upon these standard thicknesses, distortion free location of the sightglass is guaranteed provided of course that the welding flange has been correctly welded into or onto the vessel wall. Nominal sizes DN50 to DN200 are available (viewing diameter: 80 to 225 mm) These fittings are available for pressure up to 16 bar (depending on size, higher pressure rating on request) Temperature rating up to 280°C (depending on material selection), up to 900°C possible Materials available are stainless, carbon steels and specials such as Hastelloy custom built versions
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.