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PTFE Lined Concentric Reducer
Lined concentric reducer, NB 3/4"×1/2" to 16"×14"
Lined concentric reducer joining two bores on a common centre line — 39 size combinations from 3/4"×1/2" to 16"×14", face to face 114 mm to 457 mm.
| Product type | Lined concentric reducer |
|---|---|
| Body / steel grade | Reducer ASTM A 106 Gr. B, flanges 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 3/4"×1/2" to NB 16"×14" (39 combinations) |
Product overview
What it does, and where it fits.
A concentric reducer changes bore while keeping both ends on the same centre line, which is the normal choice for vertical runs and wherever the pipe centre must not shift. The lined version carries a continuous fluoropolymer bore through the taper.
The catalogue lists 39 size combinations. Note the lining pattern: for most combinations PFA and FEP are marked applicable while PTFE is not, and PTFE becomes available on the combinations where the reduction is by one nominal size — for example 4"×3", 6"×4", 8"×6", 10"×8", 12"×10", 14"×12" and 16"×14". The table below reproduces those marks exactly, row for row.
Features
Built into every unit.
- Both ends on a common centre line
- 39 size combinations from NB 3/4"×1/2" to 16"×14"
- Reducer body to ASTM A 106 Gr. B, flanges to B16.5 Class 150
- Standard version has both flanges fixed
- Face to face 114 mm to 457 mm
Benefits
Why it earns its place in the line.
- 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
- Completely resistant to hydrolysis with an excellent barrier to water permeation
- Steel strength on the outside, fluoropolymer chemistry on the inside — at a fraction of the cost of solid exotic alloys
Applications & industries
Where it is specified.
Typical applications
- Bore changes in vertical lined runs
- Pump and equipment connections of a different size to the line
- Velocity control where a line steps down to a smaller header
- 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 Concentric Reducer.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Lined concentric reducer |
|---|---|
| Body / steel grade | Reducer ASTM A 106 Gr. B, flanges 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 3/4"×1/2" to NB 16"×14" (39 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 | 3 mm diameter vent holes — one per fitting; spools under 500 mm get a single central hole, spools over 500 mm get two holes about 150 mm from each end |
| 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 |
| Standard version | Both flanges fixed |
| NB₁ | NB₂ | Face to face L (±2) | PTFE | PFA | FEP |
|---|---|---|---|---|---|
| 0.75" | 0.5" | 114 | ✓ | ✓ | ✓ |
| 1" | 0.5" | 114 | — | ✓ | ✓ |
| 1" | 0.75" | 114 | ✓ | ✓ | ✓ |
| 1.5" | 0.75" | 114 | — | ✓ | ✓ |
| 1.5" | 1" | 114 | ✓ | ✓ | ✓ |
| 2" | 1" | 127 | — | ✓ | ✓ |
| 2" | 1.5" | 127 | ✓ | ✓ | ✓ |
| 2.5" | 1" | 140 | — | ✓ | ✓ |
| 2.5" | 1.5" | 140 | — | ✓ | ✓ |
| 2.5" | 2" | 140 | ✓ | ✓ | ✓ |
| 3" | 1" | 152 | — | ✓ | ✓ |
| 3" | 1.5" | 152 | — | ✓ | ✓ |
| 3" | 2" | 152 | — | ✓ | ✓ |
| 3" | 2.5" | 152 | ✓ | ✓ | ✓ |
| 4" | 1" | 178 | — | ✓ | ✓ |
| 4" | 1.5" | 178 | — | ✓ | ✓ |
| 4" | 2" | 178 | — | ✓ | ✓ |
| 4" | 2.5" | 178 | — | ✓ | ✓ |
| 4" | 3" | 178 | ✓ | ✓ | ✓ |
| 6" | 1" | 229 | — | ✓ | ✓ |
| 6" | 2" | 229 | — | ✓ | ✓ |
| 6" | 2.5" | 229 | — | ✓ | ✓ |
| 6" | 3" | 229 | — | ✓ | ✓ |
| 6" | 4" | 229 | ✓ | ✓ | ✓ |
| 8" | 4" | 279 | — | ✓ | ✓ |
| 8" | 5" | 279 | — | ✓ | ✓ |
| 8" | 6" | 279 | ✓ | ✓ | ✓ |
| 10" | 4" | 305 | — | ✓ | ✓ |
| 10" | 6" | 305 | — | ✓ | ✓ |
| 10" | 8" | 305 | ✓ | ✓ | ✓ |
| 12" | 6" | 356 | — | ✓ | ✓ |
| 12" | 8" | 356 | — | ✓ | ✓ |
| 12" | 10" | 356 | ✓ | ✓ | ✓ |
| 14" | 8" | 406 | — | ✓ | ✓ |
| 14" | 10" | 406 | — | ✓ | ✓ |
| 14" | 12" | 406 | ✓ | ✓ | ✓ |
| 16" | 10" | 457 | — | ✓ | ✓ |
| 16" | 12" | 457 | — | ✓ | ✓ |
| 16" | 14" | 457 | ✓ | ✓ | ✓ |
All dimensions in mm. ✓ = applicable, — = not applicable, reproduced exactly as marked in the catalogue.
Available on request
- Flange connection: 1 fixed and 1 loose flange
- Stainless steel body
- Higher diameters on request
FAQ
Questions we are asked about this item.
The catalogue marks PTFE as applicable on the one-step reductions and lists the wider steps in PFA and FEP only. We have reproduced its marks exactly rather than assuming. If you need PTFE on a combination shown as PFA/FEP, send us the duty and we will confirm.
Concentric keeps both ends on one centre line and suits vertical runs. Eccentric keeps one side flat so a horizontal line can stay bottom-flat and drain, or top-flat to avoid trapping gas.
Higher diameters are available on request. Send the two bores and the face-to-face dimension you need.
Related products
Commonly specified alongside PTFE Lined Concentric Reducer.
Lined Fittings
Lined Pipes & Spools
Lined Fittings
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?
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