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Weld-On Circular Sight Glass
Circular sight glasses with weld pads, flange cover and all hardware included. Ready to install & use. These sight windows allow for a quick observation inside pressure vessels, silos, pipelines, oil tanks, mixers separators.
Papenmeier - F. H. / Lumiglas
Lumiglas Circular Sightglass Weld-On, Stainless Steel Housing, Borosilicate Window, ASME Class 150

Weld-on circular sight glass for a quick observation inside pressure vessels, silos, pipelines, oil tanks, mixers separators. This sightglass fitting comes standard with all seals and mounting hardware included.
The kit includes one Weld pad made from 316L stainless steel, one Cover flange, one toughened borosilicate disc, one seal gasket, one cushion gasket made from Klinger(R) C-4400, eight mounting studs and nuts.
The Weld pad is flat on the bottom and has a weld prep chamfer ready to be welded to a flat process wall. Curvature can be machined in as needed to match non-flat vessel walls. The weld pad made from 316L has better overall corrosion resistance than 321 or RST 37.2, which have greater strength. The combination of 316L for the weld pad and 321stainless steel or 37.2 carbon steel for the clamp flange gives this kit the most optimum balance of strength and corrosion resistance.
Nominal Pipe Size | Aperture Dia. | Housing Material | Window Material | Pressure Rating | Mfg P/N | Encole P/N | Price | |
---|---|---|---|---|---|---|---|---|
ISO-80 | 100 mm | 316L Stainless Steel | Tempered Borosilicate Glass | 150 psi | DN-B1-BA1-Seal-KANNN | 779E7001 | $ 844.00 each | |
ISO-100 | 125 mm | 316L Stainless Steel | Tempered Borosilicate Glass | 150 psi | DN-C1-BA1-Seal-KANNN | 779E7002 | $ 1003.00 each | |
ISO-125 | 150 mm | 316L Stainless Steel | Tempered Borosilicate Glass | 150 psi | DN-D1-BA1-Seal-KANNN | 779E7003 | $ 1334.00 each | |
ISO-150 | 175 mm | 316L Stainless Steel | Tempered Borosilicate Glass | 150 psi | DN-E1-BA1-Seal-KANNN | 779E7004 | $ 1725.00 each | |
ISO-200 | 225 mm | 316L Stainless Steel | Tempered Borosilicate Glass | 150 psi | DN-F1-BA1-Seal-KANNN | 779E7005 | $ 2504.00 each |
Papenmeier - F. H. / Lumiglas
Lumiglas Circular Sightglass Weld-On, Carbon Steel Housing, Borosilicate Window, ASME Class 150

Weld-on circular sightglass for a quick observation inside pressure vessels, silos, pipelines, oil tanks, mixers separators. This sightglass fitting comes standard with all seals and mounting hardware included. The kit includes one Weld pad, one Cover flange, one toughened borosilicate disc, one seal gasket, one cushion gasket made from Klinger(R) C-4400, eight mounting studs. The Weld pad is flat on the bottom and has a weld prep chamfer ready to be welded to a flat process wall. Curvature can be machined in as needed to match non-flat vessel walls. This kit is suitable for clean room applications, semiconductor, pharmaceutical or food processing applications with requirements for sanitary use. After welding the ferrule (weld pad) the sightglass disc has a permanent dedicated location on the pressure vessel. Cover flange, window, seals and mounting hardware can be replaced during scheduled service intervals or as needed. Sightglass disc and the gaskets must be replaced whenever the assembly is taken apart.
Nominal Pipe Size | Aperture Dia. | Housing Material | Window Material | Pressure Rating | Mfg P/N | Encole P/N | Price | |
---|---|---|---|---|---|---|---|---|
ISO-80 | 100 mm | Carbon Steel RST 37.2 | Tempered Borosilicate Glass | 150 psi | DN-B1-AA1A1KANNN | 780E3501 | $ 509.00 each | |
ISO-100 | 125 mm | Carbon Steel RST 37.2 | Tempered Borosilicate Glass | 150 psi | DN-C1-AA1A1KANNN | 780E3502 | $ 638.00 each | |
ISO-125 | 150 mm | Carbon Steel RST 37.2 | Tempered Borosilicate Glass | 150 psi | DN-D1-AA1A1KANNN | 780E3503 | $ 980.00 each | |
ISO-150 | 175 mm | Carbon Steel RST 37.2 | Tempered Borosilicate Glass | 150 psi | DN-E1-AA1A1KANNN | 780E3504 | $ 1305.00 each | |
ISO-200 | 225 mm | Carbon Steel RST 37.2 | Tempered Borosilicate Glass | 150 psi | DN-F1-AA1A1KANNN | 780E3505 | $ 1686.00 each |