Double Window Sight Glass | MS Body EPDM Lined | Flanged | DN25–DN300 | PN16 | Illuminated Viewing | Supplier India

Description

Double Window Sight Glass Supplier India | MS Body EPDM Lined | Flanged | DN25–DN300 | PN16 | Backlit Illuminated Viewing | KELOR

Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India
Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B
MOQ: 10 Nos | Body: MS + EPDM lining | Windows: Two opposing borosilicate
Ends: Flanged PN10/PN16 | Sizes: DN25–DN300

Double Window Sight Glass Supplier in India

Krishna Industries (KELOR), based in Ahmedabad, Gujarat, is a B2B supplier of Double Window Sight Glasses — Mild Steel (MS) body with internal EPDM rubber lining — two opposing borosilicate glass windows — metal guard — PTFE glass gaskets — flanged ends EN 1092-1 — DN25 to DN300 — PN10 / PN16 — optional LED illuminator fitting — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad.

A double window sight glass has two borosilicate glass windows mounted on directly opposite sides of the body. A light source placed at one window passes through the process fluid and the observer watching from the opposite window sees the fluid clearly — even if the fluid is dark, opaque, or heavily coloured. This backlit illuminated viewing is the primary reason double window sight glasses are specified over single window types in ETP and STP effluent monitoring, textile dye plant flow indication, chemical plant dark process fluid, and any application where a single window shows nothing because the fluid does not transmit ambient light.

Double Window vs Single Window Sight Glass

Body Material Guide — MS+EPDM vs CI vs SS

Technical Specifications

Applications in Indian Industries

• ETP and STP — effluent monitoring — DN100–DN200 MS EPDM flanged PN16 — effluent discharge header flow confirmation, colour monitoring of treated effluent before discharge — double window essential as treated effluent is often dark or coloured — backlit viewing confirms flow and colour compliance with CPCB discharge norms
• Textile dyeing units — Surat, Erode, Tiruppur — DN50–DN150 MS EPDM — dye solution transfer line flow indication — coloured dye (black, navy, red) is completely opaque in single window — double window with LED illuminator allows operator to confirm dye flow and detect air ingestion or blockage
• Chemical plants — Ankleshwar, Vapi — DN50–DN150 MS EPDM or SS316 — chemical transfer and dosing line flow confirmation — dark chemical solutions, dye intermediates, reactive chemicals — operator confirms flow before and after batch addition
• Water treatment plants — DN100–DN300 MS EPDM — raw water intake monitoring, filter backwash flow confirmation, treated water distribution — large bore economical MS+EPDM body for utility water service
• Pharmaceutical plants — DN25–DN100 SS316 (where GMP requires SS body) — API process line flow verification, solvent transfer confirmation, utility water monitoring — operator visually confirms flow before proceeding to next batch step
• Food and beverage — DN50–DN100 SS316 or MS EPDM (non-food-contact utility) — product line flow monitoring, CIP return flow confirmation — double window confirms CIP return clarity (clear = clean) without opening the line
• Power plant auxiliary — DN50–DN150 MS EPDM — cooling water flow confirmation, chemical dosing line flow indication, condensate polisher inlet — backlit viewing useful in low-light basement pipe tunnels

Related Products — Krishna Industries (KELOR)

• Sight Glass Valve — Single Window — for clear transparent fluid flow indication where double window is not required — CI, WCB, SS body — screwed and flanged
• SS Butterfly Valve — CF8/CF8M — for isolation upstream and downstream of sight glass in pharma, food, and chemical lines
• PP Flanged Diaphragm Valve — for chemical dosing line isolation where double window sight glass monitors dosing flow
• Y Strainer — install upstream of sight glass to protect borosilicate windows from debris impact damage
• Dual Plate Check Valve — for pump discharge NRV in water treatment and ETP systems where double window sight glass monitors pump output flow

Frequently Asked Questions

1. Why is a double window sight glass needed — can’t I just use a single window?

For clear, transparent fluids like clean water or light-coloured process fluids, a single window sight glass is adequate — ambient light enters through the single window, illuminates the fluid, and the observer sees by reflected light. For dark, opaque, or heavily coloured fluids — ETP effluent, textile dye solutions, dark chemical streams, black liquor — a single window shows nothing because the dark fluid absorbs all ambient light and reflects nothing back. A double window allows a light source to be placed at one window, which passes through (or illuminates the boundary of) the fluid, and the observer watching from the opposite window sees the fluid clearly by transmitted light. This is the only reliable way to visually monitor flow in dark or opaque process streams without opening the pipeline.

2. Is EPDM lining compatible with all industrial fluids?

EPDM is compatible with water (hot and cold), dilute acids and alkalis, effluent, ozone, chlorinated water, steam up to 120°C, and most mild process chemicals. EPDM is NOT compatible with petroleum oils, hydrocarbon solvents, concentrated sulphuric acid, or aromatic/chlorinated solvents — EPDM swells and degrades on contact with these fluids. For oil or solvent service, specify a CI body (no lining) or SS316 body sight glass instead. When in doubt about compatibility, WhatsApp the fluid name and concentration for confirmation before ordering.

3. What is borosilicate glass and why is it used?

Borosilicate glass (e.g. Pyrex type) contains boron trioxide which gives it very low thermal expansion and high resistance to thermal shock — it does not crack when hot fluid enters suddenly or when cold cleaning water hits a hot glass surface. It also has excellent chemical resistance to acids, alkalis, and most process chemicals. Borosilicate glass to BS 3463 / DIN 7080 is the standard for industrial sight glasses in India and internationally. Tempered (toughened) glass is an alternative for applications with higher mechanical shock risk — it is stronger against impact but has lower thermal shock resistance than borosilicate.

4. Can I add an illuminator to an existing double window sight glass?

Yes — the LED illuminator is a fitting that bolts or clips to the glass guard on one window, directing light through the glass into the fluid. It can be retrofitted to any double window sight glass where the glass guard has a compatible fitting provision. For new orders, specify “with LED illuminator” and the supply voltage (24V DC standard / 220V AC) and whether explosion-proof rating is required (ATEX Zone 1/2 for chemical plant hazardous area).

5. What is the MOQ?

MOQ is 10 Nos. ETP, water treatment, or chemical plant project orders — 10 to 100+ Nos across sizes — with dimensional report and GST invoice. WhatsApp body material, size list, pressure class, and whether LED illuminator is required for project pricing within 2 hours.

Conclusion

The Double Window Sight Glass supplied by Krishna Industries (KELOR) is the backlit illuminated viewing solution for dark, opaque, and coloured process fluids — Mild Steel body with internal EPDM rubber lining — two opposing borosilicate glass windows — metal guard — PTFE glass gaskets — flanged ends EN 1092-1 — DN25 to DN300 — PN10 / PN16 — optional LED illuminator fitting. ETP/STP effluent monitoring, textile dye plant flow indication, chemical utility, water treatment, pharma, food and beverage — wherever single window sight glass fails to provide visibility in dark or opaque media. Not suitable for petroleum oil or solvents. GST invoice, Pan India dispatch from Ahmedabad. WhatsApp size, pressure class, illuminator requirement, and quantity for pricing within 2 hours.