Double Window Sight Flow Indicators
Tubular Sight Flow Indicators
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Full technical data and dimensions
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PP Tubular Sight Flow Indicator
Polypropylene tubular, 25NB to 150NB
Polypropylene flanged tubular sight flow indicator — light, durable and ideal for corrosive aqueous conditions. 25NB to 150NB, face to face 190–200 mm.
| Product type | PP tubular sight flow indicator |
|---|---|
| Flange material | PP, 2 off |
| Glass tube | Borosilicate 3.3, 1 off |
| Gasket | PTFE, 2 off |
| Tie rod | G.I. / PP / A2 / CF8 |
| Fasteners | G.I. / A2 / CF8 |
| Safety shield | Polycarbonate / acrylic, provided on request |
| Size range | 25NB to 150NB |
Product overview
What it does, and where it fits.
The polypropylene tubular model pairs PP flanges with a borosilicate 3.3 glass tube and PTFE gaskets. It gives the full-bore 360° visibility of a tubular unit while resisting the aqueous acids, alkalis and salts that attack steel — at a fraction of the weight of a metallic unit.
Sizes run 25NB to 150NB with face to face of 190 mm up to 50NB and 200 mm above. Tie rods and fasteners can be G.I., PP, A2 or CF8 depending on the external environment, and special sizes can be provided on request.
Features
Built into every unit.
- Polypropylene flanges with borosilicate 3.3 glass tube
- Strong and durable design at low weight
- Ideal for usage in corrosive conditions
- Tie rods in G.I., PP, A2 or CF8 to suit the environment
- Special sizes can be provided on request
Benefits
Why it earns its place in the line.
- Light weight construction simplifies support and installation
- Resists aqueous corrosives that attack steel
- Full 360° visibility over the glass section
- Substantially cheaper than a lined or stainless tubular unit
Applications & industries
Where it is specified.
Typical applications
- Water and effluent treatment lines
- Plating and surface treatment chemicals
- Chemical dosing and dilution skids
- Watching for settling solids, stratification or a moving interface
Industries served
- Chemical processing
- Pharmaceutical
- Dairy & food
- Water & effluent treatment
- Agrochemicals
- Paper & bleaching
- Petrochemical
- Distillation & solvent recovery
Technical data
Specification for PP Tubular Sight Flow Indicator.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | PP tubular sight flow indicator |
|---|---|
| Flange material | PP, 2 off |
| Glass tube | Borosilicate 3.3, 1 off |
| Gasket | PTFE, 2 off |
| Tie rod | G.I. / PP / A2 / CF8 |
| Fasteners | G.I. / A2 / CF8 |
| Safety shield | Polycarbonate / acrylic, provided on request |
| Size range | 25NB to 150NB |
| Face to face | 190 mm to 200 mm, tolerance ±3 mm |
| Flange standard | ANSI B-16.5; BS-10 Table E, BS-10 Table F and PN 10 also available |
| Size | OD (±3) | PCD | H (No.) | H dia. | L (±3) |
|---|---|---|---|---|---|
| 25NB | 108 | 79 | 4 | 16 | 190 |
| 40NB | 127 | 98 | 4 | 16 | 190 |
| 50NB | 152 | 121 | 4 | 19 | 190 |
| 65NB | 180 | 140 | 4 | 19 | 200 |
| 80NB | 191 | 152 | 4 | 19 | 200 |
| 100NB | 229 | 191 | 8 | 19 | 200 |
| 150NB | 279 | 241 | 8 | 22 | 200 |
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 | Flange | 2 | PP |
| 2 | Gasket | 2 | PTFE |
| 3 | Glass tube | 1 | Borosilicate 3.3 |
| 4 | Tie rod | — | G.I./PP/A2/CF8 |
| 5 | Fasteners | — | G.I./A2/CF8 |
| 6 | Safety shield* | 1 | Polycarbonate / acrylic |
Available on request
- Special sizes on request
- Choice of tie rod material
- Safety shield on request
Exploded view
Every part, in assembly order.
Item numbers match the material specification table above.
FAQ
Questions we are asked about this item.
This one gives 360° visibility over the length of a glass tube; the double window model has two opposed ports. The PP tubular uses PTFE gaskets, while the PP double window uses silicone.
G.I. is the default; PP where the external environment is corrosive; A2 or CF8 where strength and corrosion resistance are both needed.
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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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