Double Window Sight Flow Indicators
Double Window Sight Flow Indicators
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Full technical data and dimensions
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SS Jacketed Double Window Sight Flow Indicator
Stainless jacketed double window, 25NB to 400NB
Stainless steel double window sight flow indicator inside a heating or cooling jacket — keeps the viewing section at temperature so the glass stays clear. 25NB to 400NB.
| Product type | Jacketed double window sight flow indicator |
|---|---|
| Body material | CF8 / CF8M / CF3M / CG3M cast stainless steel |
| Jacket material | CF8 / CF8M / CF3M / CG3M cast stainless steel |
| Glass | Toughened borosilicate 3.3 or soda lime, 2 off |
| Gasket | PTFE, 4 off |
| Fasteners | A2 / CF8 |
| Size range | 25NB to 400NB |
| Face to face | 160 mm to 1400 mm, tolerance ±3 mm |
Product overview
What it does, and where it fits.
A sight glass in a heated line is the coldest point in that line. Product crystallises on the glass, condensation fogs it, and within a shift the operator can no longer see through it. A jacketed sight flow indicator solves that by circulating steam or hot fluid around the viewing chamber so the glass stays at process temperature.
This model has a cast stainless steel body and jacket in CF8, CF8M, CF3M or CG3M, two toughened borosilicate 3.3 or soda lime windows, and PTFE gaskets. Face-to-face runs from 160 mm at 25NB to 1400 mm at 400NB.
Custom bodies, alternative jacket materials and higher pressure ratings can be built to order, and the whole unit can be lined in FEP or PFA for aggressive service.
Features
Built into every unit.
- Heating or cooling jacket keeps the glass clear on crystallising and viscous duty
- Cast stainless body and jacket — CF8, CF8M, CF3M or CG3M
- Two toughened borosilicate 3.3 or soda lime windows
- 25NB to 400NB, face to face 160 mm to 1400 mm
- FEP/PFA (PTFE) lined version available
Benefits
Why it earns its place in the line.
- Glass stays clear on products that would crystallise or condense on a cold window
- Large view area with easy maintenance and durable construction
- Robust flanged body drops straight into an existing line
- Glass and gaskets replaceable in situ without cutting the pipework
- Mountable in any orientation
Applications & industries
Where it is specified.
Typical applications
- Crystallising and high-melting-point products
- Viscous fluids that need to be kept warm to remain visible
- Steam-traced lines where the sight glass is the cold spot
- Confirming that a line is actually flowing
- Watching for colour change, cloudiness or phase separation
Industries served
- Chemical processing
- Pharmaceutical
- Dairy & food
- Water & effluent treatment
- Agrochemicals
- Paper & bleaching
- Petrochemical
- Distillation & solvent recovery
Technical data
Specification for SS Jacketed Double Window Sight Flow Indicator.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Jacketed double window sight flow indicator |
|---|---|
| Body material | CF8 / CF8M / CF3M / CG3M cast stainless steel |
| Jacket material | CF8 / CF8M / CF3M / CG3M cast stainless steel |
| Glass | Toughened borosilicate 3.3 or soda lime, 2 off |
| Gasket | PTFE, 4 off |
| Fasteners | A2 / CF8 |
| Size range | 25NB to 400NB |
| Face to face | 160 mm to 1400 mm, tolerance ±3 mm |
| Flange standard | ANSI B-16.5; BS-10 Table E, BS-10 Table F and PN 10 also available |
| Pressure rating | High pressure rating up to 30 bar can be provided on request |
| Testing | Hydro tested to the standard hydro test pressure chart; radiography on request |
| Certification | Material and pressure test certificate can be provided on request |
| Lining option | FEP / PFA (PTFE) lined available |
| Size | OD (±3) | PCD | H (No.) | H dia. | L (±3) |
|---|---|---|---|---|---|
| 25NB | 108 | 79 | 4 | 16 | 160 |
| 40NB | 127 | 98 | 4 | 16 | 200 |
| 50NB | 152 | 121 | 4 | 19 | 230 |
| 80NB | 191 | 152 | 4 | 19 | 310 |
| 100NB | 229 | 191 | 8 | 19 | 350 |
| 150NB | 279 | 241 | 8 | 22 | 480 |
| 200NB | 343 | 298 | 8 | 22 | 650 |
| 250NB | 406 | 362 | 12 | 25 | 780 |
| 300NB | 483 | 432 | 12 | 25 | 900 |
| 350NB | 533 | 476 | 12 | 29 | 1090 |
| 400NB | 597 | 540 | 16 | 29 | 1400 |
All dimensions in mm. Flange drilling to ANSI B-16.5; BS-10 Table E, BS-10 Table F and PN 10 drilling are also available — see the flange standards table.
| No. | Description | Qty. | Material |
|---|---|---|---|
| 1 | Body | 1 | CF8/CF8M/CF3M/CG3M |
| 2 | Jacketed body | 1 | CF8/CF8M/CF3M/CG3M |
| 3 | Toughened glass | 2 | Borosilicate 3.3 / soda lime |
| 4 | Gasket | 4 | PTFE |
| 5 | Connectors | 2 | CF8/CF8M/CF3M/CG3M |
| 6 | Fasteners | — | A2/CF8 |
Available on request
- Custom-made design on request
- FEP/PFA (PTFE) lined
- High pressure rating up to 30 bar
- Customised MOC for body and jacket
- Different flange standards
- Material and pressure test certificate
Exploded view
Every part, in assembly order.
Item numbers match the material specification table above.
FAQ
Questions we are asked about this item.
Because an unjacketed sight glass is the cold spot in a heated line. Product crystallises or condenses on the window and within a shift you cannot see through it. The jacket holds the glass at process temperature.
The standard rating follows the hydro test pressure chart for jacketed and double window units. A high pressure rating up to 30 bar can be provided on request.
Yes — the catalogue lists customised MOC for body and jacket as available, alongside the standard CF8, CF8M, CF3M and CG3M options.
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Enquiry
Tell us your line size — we'll confirm the spec.
Send the bore, the media, the temperature and pressure, and the flange standard you work to. Drawings and custom sizes welcome.
Not sure which spec fits your process?
Send your requirement — media, temperature, pressure, dimensions — and we'll recommend the right product or fabricate it.
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