Pressure vessel sight glass DIN 28121
DIN 28121 pressure vessel sight glass — weld-on circular sight port DN25–DN200. Borosilicate (DIN7080) or soda-lime glass( other material on request ), stainless steel flanges, PN10/25 (higher on request). Download datasheet & request quote.
Description
Pressure Vessel Sight Glass (DIN 28121)
TL;DR: DIN 28121 weld-on flanged sight glass for pressure vessels — available DN25–DN200, borosilicate (DIN7080) or reinforced safety glass, stainless steel flanges, explosion-proof lighting and wipe systems available.
Core: Pressure vessel sight glass
- Standard sizes: DN25–DN200.
- Glass: Borosilicate (DIN7080) or tempered soda-lime safety glass (DIN8902).
- Flanges: Carbon steel or stainless steel (1.4571/1.4541 / 304/316 variants).
- Options: Explosion-proof LED lighting, wipe systems, dual-window safety arrangements.
Usage: pressure vessels, stirred tanks, separators and pipeline inspection ports.
Request quote
Download datasheet (PDF)
Need a custom PN rating, material certificate or inspection photos? Contact lumistar@188.com.
What is a pressure vessel sight glass (DIN 28121)?
A pressure vessel sight glass per DIN 28121 is a round, weld-on flanged sight port designed for direct visual inspection of tanks and pressure equipment. Typical nominal sizes are DN50–DN200 with viewing diameters matched to DIN 28120 seat geometry.
Key benefits
- Standards-based fit & interchangeability — designed to DIN 28121 dimensions so replacements and retrofits fit common vessel seats.
- Pressure & temperature capability — typical PN classes PN10/25; higher ratings or custom P–T curves available depending on glass thickness and assembly method. (See technical table below.)
- Optical clarity & distortion control — specified glass thickness and flange/welding geometry preserve distortion-free viewing when assembled properly.
- Accessory support — threaded holes for spotlights, explosion-proof lamps, wipe systems and specialized gaskets for glass-lined vessels.
Typical technical specifications
| Item | Specification (example / placeholder) | Notes |
|---|---|---|
| Standard | DIN 28121 | Weld-on flanged circular sight glass |
| Nominal sizes | DN25 – DN200 | Common in DN50 → DN200; other sizes on request |
| Viewing diameter (d1) | 48 – 150 mm | Match glass thickness to pressure–temperature (P–T) rating, Customizable |
| Glass options | Borosilicate (DIN7080) / Soda-lime (DIN8902) / Reinforced safety glass | Specify tempering, surface quality and certificates at order |
| Pressure rating | PN10 / PN25 (size dependent) | Higher pressures possible — provide vessel wall thickness & seat geometry |
| Flange material | Carbon steel (RSt37-2), SS 1.4541 / 1.4571 / 304 / 316 | Special alloys & certificates available on request |
| Gaskets | KLINGERSil C-4400 / Silicone / PTFE | Select by operating temperature and chemical compatibility |
| Fastening bolts | M16 / M20 per size (see bolt torque table) | Tighten diametrically opposite pairs; follow torque values from datasheet |
| Note: The items above are typical placeholders. For a quote or certified drawings, please provide operating pressure, temperature, media and a simple sketch or flange bolt pattern. | ||
Technical values above are typical. For certified tolerances, P–T curves, and material certificates (EN 10204 3.1B/3.1A), please provide your seat geometry and operating conditions so we can issue a test report and suitability statement. See supplier leaflets for recommended bolt tightening procedures and distortion notes.
Accessories & options
- Explosion-proof LED luminaires (threaded flange mounting)
- Wipe systems for sticky/slurry processes
- Dual-window safety arrangements and protective tempering
- Custom flange materials and surface finish (Ra values on request)
- Certificates: EN 10204 3.1B, material MTRs, FAT photos on request
Downloads & contact
Download DIN 28121 datasheet (PDF)
Request a quote / technical review
If you want our engineering team to confirm P–T ratings for a particular thickness/diameter, upload your seat photos and dimensions to our technical request form or email lumistar@188.com.
FAQ
- Q: Are DIN 28121 sight glasses interchangeable?
- A: When matched to the same nominal DN and seat geometry, DIN 28121 sight glasses are typically interchangeable — but confirm seat depth, gasket width and flange thickness before retrofit.
- Q: How is pressure rating determined?
- A: Pressure rating depends on glass type, thickness, assembly torque, and flange fixation. Use P–T curves supplied by the manufacturer for exact operating limits. :contentReference[oaicite:10]{index=10}
- Q: Can you supply material certificates?
- A: Yes — EN 10204 3.1/3.1B certificates and MTRs are available on request for pressure-critical orders.
