Tubular Sight Flow Indicators
Tubular Sight Flow Indicators
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Full technical data and dimensions
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SS Allen Key with T-Bush Tubular Sight Flow Indicator
Stainless allen key with PTFE T-bush, 15NB to 400NB
Allen key tubular sight flow indicator with PTFE T-bushes isolating the flanges — all wetted parts PTFE and glass only, without the cost of a full lining.
| Product type | Allen key with T-bush tubular sight flow indicator |
|---|---|
| Flange material | CF8 / CF8M / CF3M cast stainless steel, 2 off |
| T-bush | PTFE, 2 off |
| Glass tube | Borosilicate 3.3, 1 off |
| Gasket | PTFE, 4 off |
| Tie rod | A2 / CF8 / CF8M |
| Fasteners | A2 / CF8 |
| Safety shield | Polycarbonate / acrylic, provided on request |
Product overview
What it does, and where it fits.
A PTFE T-bush is a top-hat sleeve that sits between the glass tube and the flange, isolating the metal from the fluid at the one place a plain tubular unit is vulnerable. The result is that all wetted parts are PTFE and glass only, achieved without lining the whole flange.
That makes this a cost-effective design for corrosive fluids: it gives the chemical resistance of a lined unit at a lower price, and because the bush is a discrete component, repair and maintenance can be carried out on site.
Flanges are cast stainless in CF8, CF8M or CF3M. Face-to-face is 185 mm across most of the range, rising to 215 mm at 400NB, and custom lengths up to 1500 mm are available.
Features
Built into every unit.
- PTFE T-bushes isolate the flanges — all wetted parts are PTFE and glass only
- Cost effective design for corrosive fluids
- Repair and maintenance can be easily carried out on site
- Cast stainless flanges — CF8, CF8M or CF3M
- Custom face to face lengths up to 1500 mm available
Benefits
Why it earns its place in the line.
- Full fluoropolymer wetted path without the cost of a lined flange
- T-bush is a replaceable component — site repairable
- 360° visibility over the whole length — sees what a two-window unit misses
- Glass tube and gaskets replaceable on site without cutting the pipework
- Short face to face across the size range makes retrofit straightforward
Applications & industries
Where it is specified.
Typical applications
- Corrosive process streams on a budget
- Duties where site maintenance capability matters
- Watching for settling solids, stratification or a moving interface
- Confirming complete drainage of a line before maintenance
Industries served
- Chemical processing
- Pharmaceutical
- Dairy & food
- Water & effluent treatment
- Agrochemicals
- Paper & bleaching
- Petrochemical
- Distillation & solvent recovery
Technical data
Specification for SS Allen Key with T-Bush Tubular Sight Flow Indicator.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Allen key with T-bush tubular sight flow indicator |
|---|---|
| Flange material | CF8 / CF8M / CF3M cast stainless steel, 2 off |
| T-bush | PTFE, 2 off |
| Glass tube | Borosilicate 3.3, 1 off |
| Gasket | PTFE, 4 off |
| Tie rod | A2 / CF8 / CF8M |
| Fasteners | A2 / CF8 |
| Safety shield | Polycarbonate / acrylic, provided on request |
| Size range | 15NB to 400NB |
| Face to face | 185 mm to 215 mm standard; up to 1500 mm on request |
| Wetted parts | PTFE and borosilicate glass only |
| 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) |
|---|---|---|---|---|---|
| 15NB | 90 | 60 | 4 | 16 | 185 |
| 20NB | 100 | 70 | 4 | 16 | 185 |
| 25NB | 108 | 79 | 4 | 16 | 185 |
| 40NB | 127 | 98 | 4 | 16 | 185 |
| 50NB | 152 | 121 | 4 | 19 | 185 |
| 65NB | 180 | 140 | 4 | 19 | 185 |
| 80NB | 191 | 152 | 4 | 19 | 185 |
| 100NB | 229 | 191 | 8 | 19 | 185 |
| 150NB | 279 | 241 | 8 | 22 | 185 |
| 200NB | 343 | 298 | 8 | 22 | 195 |
| 250NB | 406 | 362 | 12 | 25 | 200 |
| 300NB | 483 | 432 | 12 | 25 | 205 |
| 350NB | 533 | 476 | 12 | 29 | 210 |
| 400NB | 597 | 540 | 16 | 29 | 215 |
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 | CF8/CF8M/CF3M |
| 2 | T-bush | 2 | PTFE |
| 3 | Gasket | 4 | PTFE |
| 4 | Glass tube | 1 | Borosilicate 3.3 |
| 5 | Tie rod | — | A2/CF8/CF8M |
| 6 | Fasteners | — | A2/CF8 |
| 7 | Safety shield* | 1 | Polycarbonate / acrylic |
Available on request
- Custom face to face lengths up to 1500 mm
- Safety shield (polycarbonate / acrylic) on request
- Different flange standards
Exploded view
Every part, in assembly order.
Item numbers match the material specification table above.
FAQ
Questions we are asked about this item.
Both give a PTFE and glass wetted path. The T-bush version is cheaper and site-repairable; the fully lined version protects the whole flange body and is the better choice for the most aggressive duties or where permeation is a concern.
Yes — the catalogue notes that repair and maintenance can be easily carried out at site, which is one of the main reasons to choose this design.
Related products
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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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