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Full technical data and dimensions
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PTFE Lined Reducing Flange
Lined reducing flange, NB 1"×1/2" to 16"×14", 35–50 mm thick
Single lined flange that steps a bore down in the thickness of a flange — 53 combinations from 1"×1/2" to 16"×14", only 35 mm to 50 mm face to face.
| Product type | Lined reducing flange |
|---|---|
| Body / steel grade | IS 2062 plate / ASTM A 105 |
| Lining material | PTFE / PFA / FEP |
| Liner standard | ASTM D 1457 / ASTM D 4894-19 (PTFE), ASTM D 3307 (PFA), ASTM D 2116 (FEP) |
| Lining options | Virgin or anti-static (conductive black) PTFE to ASTM D 4894 & D 4895, PFA to ASTM D 3307, FEP to ASTM D 2116 |
| Flange standard | ASME/ANSI B16.5 |
| Flange class | Class 150 standard; Class 300 on request |
| Size range | NB 1"×1/2" to NB 16"×14" (53 combinations) |
Product overview
What it does, and where it fits.
Where there is no room for a tapered reducer, a reducing flange makes the size change inside the flange itself. At 35 mm to 50 mm thick it takes almost no space in the run, which makes it the usual way to connect a small branch, instrument or valve to a larger lined flange.
The flange is cut from IS 2062 plate or ASTM A 105, drilled to ASME/ANSI B16.5 Class 150 on the large side, and lined with PTFE, PFA or FEP flared over the face. As with the reducers, PTFE is marked on the one-step reductions and the wider steps are listed in PFA and FEP; the table reproduces those marks row for row.
Note that reducing flanges carry no vent hole — the catalogue explicitly excludes reducing flanges, blind flanges and spacers from vent hole drilling.
Features
Built into every unit.
- Bore change inside the thickness of a flange — 35 mm to 50 mm face to face
- 53 size combinations from NB 1"×1/2" to 16"×14"
- IS 2062 plate or ASTM A 105 flange, drilled to B16.5 Class 150
- Eccentric type possible
- No vent hole required or fitted
Benefits
Why it earns its place in the line.
- Makes a size change where a tapered reducer will not fit
- Saves the length and the extra joint a reducer would add
- Outstanding corrosion resistance to aggressive organic and inorganic chemicals across a wide temperature range
- Non-stick, non-wetting bore — low surface energy keeps product moving and simplifies cleaning
- Chemically inert and pure; no additives, plasticisers, stabilisers or lubricants to contaminate the process fluid
- The lowest coefficient of friction of any solid, reducing pressure drop and deposit build-up
Applications & industries
Where it is specified.
Typical applications
- Connecting instruments and small valves to a larger lined flange
- Branch take-offs where run length is tight
- Adapting equipment nozzles to the line size
- Corrosive acid, alkali and solvent transfer
- High-purity duties where metal pick-up is unacceptable
Industries served
- Chemical processing
- Pharmaceutical
- Petrochemical
- Oil & gas
- Power generation
- Pulp & paper
- Mining & metallurgy
- Agrochemicals & dyes
Technical data
Specification for PTFE Lined Reducing Flange.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Lined reducing flange |
|---|---|
| Body / steel grade | IS 2062 plate / ASTM A 105 |
| Lining material | PTFE / PFA / FEP |
| Liner standard | ASTM D 1457 / ASTM D 4894-19 (PTFE), ASTM D 3307 (PFA), ASTM D 2116 (FEP) |
| Lining options | Virgin or anti-static (conductive black) PTFE to ASTM D 4894 & D 4895, PFA to ASTM D 3307, FEP to ASTM D 2116 |
| Flange standard | ASME/ANSI B16.5 |
| Flange class | Class 150 standard; Class 300 on request |
| Size range | NB 1"×1/2" to NB 16"×14" (53 combinations) |
| Temperature range | Continuous service to 260 °C (PTFE melting point 327 °C, PFA 306 °C, FEP 260 °C) |
| Pressure rating | ASME/ANSI B16.5 Class 150 flanges as standard; Class 300 available on request |
| Manufacturing standard | ASTM F 1545 |
| Spark testing | Every lined component spark tested at 5000 × E volts (E = liner thickness in mm), to a maximum of 15 000 V |
| Hydro testing | Hydrostatic or pneumatic test according to the lining technique; hydrostatic test on components with vent holes |
| Inspection | Dimensional and visual examination of liner and steel parts — weld aspect, overall dimensions, collar size, liner thickness, surface flaws and paint thickness |
| Vent holes | None — the catalogue excludes reducing flanges from vent hole drilling |
| External protection | Zinc epoxy primer, minimum 60 μm dry film, over steel sand-blasted to SA 2.5 |
| Certification | EN 10204 3.1 mill certificates and FDA certification for the fluoropolymer available on request |
| Face to face | 35 mm to 50 mm |
| NB₁ | NB₂ | Face to face L (±2) | PTFE | PFA | FEP |
|---|---|---|---|---|---|
| 1" | 0.5" | 35 | — | ✓ | ✓ |
| 1" | 0.75" | 35 | ✓ | ✓ | ✓ |
| 1.5" | 0.75" | 35 | — | ✓ | ✓ |
| 1.5" | 1" | 35 | ✓ | ✓ | ✓ |
| 2" | 0.75" | 35 | — | ✓ | ✓ |
| 2" | 1" | 35 | — | ✓ | ✓ |
| 2" | 1.5" | 35 | ✓ | ✓ | ✓ |
| 2.5" | 1" | 35 | — | ✓ | ✓ |
| 2.5" | 1.5" | 35 | — | ✓ | ✓ |
| 2.5" | 2" | 35 | ✓ | ✓ | ✓ |
| 3" | 1" | 35 | — | ✓ | ✓ |
| 3" | 1.5" | 35 | — | ✓ | ✓ |
| 3" | 2" | 35 | — | ✓ | ✓ |
| 3" | 2.5" | 35 | ✓ | ✓ | ✓ |
| 4" | 1" | 45 | — | ✓ | ✓ |
| 4" | 1.5" | 45 | — | ✓ | ✓ |
| 4" | 2" | 45 | — | ✓ | ✓ |
| 4" | 3" | 45 | ✓ | ✓ | ✓ |
| 6" | 1" | 45 | — | ✓ | ✓ |
| 6" | 1.5" | 45 | — | ✓ | ✓ |
| 6" | 2" | 45 | — | ✓ | ✓ |
| 6" | 3" | 45 | — | ✓ | ✓ |
| 6" | 4" | 45 | ✓ | ✓ | ✓ |
| 8" | 1" | 45 | — | ✓ | ✓ |
| 8" | 2" | 45 | — | ✓ | ✓ |
| 8" | 3" | 45 | — | ✓ | ✓ |
| 8" | 4" | 45 | — | ✓ | ✓ |
| 8" | 6" | 45 | ✓ | ✓ | ✓ |
| 10" | 2" | 45 | — | ✓ | ✓ |
| 10" | 3" | 45 | — | ✓ | ✓ |
| 10" | 4" | 45 | — | ✓ | ✓ |
| 10" | 6" | 45 | — | ✓ | ✓ |
| 10" | 8" | 45 | ✓ | ✓ | ✓ |
| 12" | 2" | 50 | — | ✓ | ✓ |
| 12" | 3" | 50 | — | ✓ | ✓ |
| 12" | 4" | 50 | — | ✓ | ✓ |
| 12" | 6" | 50 | — | ✓ | ✓ |
| 12" | 8" | 50 | — | ✓ | ✓ |
| 12" | 10" | 50 | ✓ | ✓ | ✓ |
| 14" | 2" | 50 | — | ✓ | ✓ |
| 14" | 3" | 50 | — | ✓ | ✓ |
| 14" | 4" | 50 | — | ✓ | ✓ |
| 14" | 6" | 50 | — | ✓ | ✓ |
| 14" | 8" | 50 | — | ✓ | ✓ |
| 14" | 10" | 50 | — | ✓ | ✓ |
| 14" | 12" | 50 | ✓ | ✓ | ✓ |
| 16" | 3" | 50 | — | ✓ | ✓ |
| 16" | 4" | 50 | — | ✓ | ✓ |
| 16" | 6" | 50 | — | ✓ | ✓ |
| 16" | 8" | 50 | — | ✓ | ✓ |
| 16" | 10" | 50 | — | ✓ | ✓ |
| 16" | 12" | 50 | — | ✓ | ✓ |
| 16" | 14" | 50 | ✓ | ✓ | ✓ |
All dimensions in mm. Marks reproduced exactly as printed in the catalogue.
Available on request
- Eccentric type possible
- ANSI B16.5 Class 300 flange
- Stainless steel body
- Higher diameters on request
FAQ
Questions we are asked about this item.
Use a reducing flange when the size change must happen in 35–50 mm; use a tapered reducer when you want a gradual transition and lower turbulence and you have the run length for it.
The catalogue states that reducing flanges, blind flanges and spacers are not drilled with vent holes; the liner in these items is not backed by a long enclosed steel annulus in the way a spool is.
Yes, an eccentric type is available on request.
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