Tubular Sight Flow Indicators
Tubular Sight Flow Indicators
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Full technical data and dimensions
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MS Check-Nut Tubular Sight Flow Indicator
Mild steel check-nut frame with PTFE T-bush, 15NB to 150NB
Check-nut framed tubular sight flow indicator with PTFE T-bushes — a cost-effective design for corrosive fluids with all wetted parts PTFE and glass. 15NB to 150NB.
| Product type | Check-nut tubular sight flow indicator |
|---|---|
| Frame material | MS, 1 off |
| T-bush | PTFE, 2 off |
| Glass tube | Borosilicate 3.3, 1 off |
| Gasket | PTFE, 4 off |
| Safety shield | Polycarbonate / acrylic, provided on request |
| Size range | 15NB to 150NB |
| Face to face | 192 mm to 200 mm standard; up to 1500 mm on request |
Product overview
What it does, and where it fits.
Instead of separate flanges on tie rods, this model uses a one-piece mild steel frame with check nuts to clamp the glass tube. That reduces the part count and the cost, and makes adjustment on site straightforward.
PTFE T-bushes and gaskets keep the wetted path to PTFE and borosilicate glass only, so it handles corrosive fluids despite the mild steel frame. Custom face-to-face lengths up to 1500 mm are available, and repair and maintenance can be carried out at site.
Features
Built into every unit.
- One-piece mild steel frame with check-nut clamping
- PTFE T-bushes — all wetted parts are PTFE and glass only
- Cost effective design for corrosive fluids
- Repair and maintenance can be easily carried out at site
- Custom face to face lengths up to 1500 mm available
Benefits
Why it earns its place in the line.
- Fewest parts of any tubular model — simple and inexpensive
- Full fluoropolymer wetted path despite the mild steel frame
- 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 fluid observation on a tight budget
- Applications needing frequent site maintenance
- 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 MS Check-Nut Tubular Sight Flow Indicator.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Check-nut tubular sight flow indicator |
|---|---|
| Frame material | MS, 1 off |
| T-bush | PTFE, 2 off |
| Glass tube | Borosilicate 3.3, 1 off |
| Gasket | PTFE, 4 off |
| Safety shield | Polycarbonate / acrylic, provided on request |
| Size range | 15NB to 150NB |
| Face to face | 192 mm to 200 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 | 192 |
| 20NB | 100 | 70 | 4 | 16 | 192 |
| 25NB | 108 | 79 | 4 | 16 | 192 |
| 40NB | 127 | 98 | 4 | 16 | 192 |
| 50NB | 152 | 121 | 4 | 19 | 192 |
| 65NB | 180 | 140 | 4 | 19 | 192 |
| 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 | Frame | 1 | MS |
| 2 | T-bush | 2 | PTFE |
| 3 | Gasket | 4 | PTFE |
| 4 | Glass tube | 1 | Borosilicate 3.3 |
| 5 | Safety shield* | 1 | Polycarbonate / acrylic |
Available on request
- Custom face to face lengths up to 1500 mm
- Safety shield 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.
A single mild steel frame that clamps the glass tube using check nuts, instead of two separate flanges drawn together on tie rods. Fewer parts, lower cost and easy site adjustment.
Yes — the PTFE T-bushes and gaskets keep the wetted path to PTFE and borosilicate glass only, which is why the catalogue describes it as a cost-effective design for corrosive fluids.
Related products
Commonly specified alongside MS Check-Nut Tubular Sight Flow Indicator.
Tubular Sight Flow Indicators
Tubular Sight Flow Indicators
Tubular Sight Flow Indicators
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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