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PTFE Lined Eccentric Reducer
Lined eccentric reducer, NB 3/4"×1/2" to 16"×14"
Lined eccentric reducer with offset centre lines — keeps a horizontal line flat on one side so it drains fully or avoids trapping gas. 25 combinations, face to face 114 mm to 457 mm.
| Product type | Lined eccentric 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" (25 combinations) |
Product overview
What it does, and where it fits.
An eccentric reducer offsets the two bores so that one side of the pipe stays flat through the size change. Fitted flat-side-down a horizontal line drains completely; fitted flat-side-up it will not trap gas at a pump suction. Neither is possible with a concentric reducer.
Construction and lining follow the concentric reducer: ASTM A 106 Gr. B body, B16.5 Class 150 flanges, both flanges fixed as standard, and the same lining pattern in which PTFE is marked on the one-step reductions and the wider steps are listed in PFA and FEP.
Features
Built into every unit.
- Offset centre lines — one side of the bore stays flat
- 25 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.
- Lets a horizontal line drain completely through the size change
- Avoids trapping gas at a pump suction when fitted flat-side-up
- 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
- Pump suction lines that must not trap vapour
- Horizontal runs that have to drain fully for cleaning
- Bore changes where the pipe support level cannot move
- 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 Eccentric Reducer.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Lined eccentric 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" (25 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" | 1.5" | 140 | — | ✓ | ✓ |
| 2.5" | 2" | 140 | — | ✓ | ✓ |
| 3" | 1.5" | 152 | ✓ | ✓ | ✓ |
| 3" | 2" | 152 | — | ✓ | ✓ |
| 3" | 2.5" | 152 | — | ✓ | ✓ |
| 4" | 2" | 178 | — | ✓ | ✓ |
| 4" | 3" | 178 | ✓ | ✓ | ✓ |
| 6" | 4" | 229 | ✓ | ✓ | ✓ |
| 8" | 4" | 279 | — | ✓ | ✓ |
| 8" | 6" | 279 | ✓ | ✓ | ✓ |
| 10" | 6" | 305 | — | ✓ | ✓ |
| 10" | 8" | 305 | ✓ | ✓ | ✓ |
| 12" | 8" | 356 | — | ✓ | ✓ |
| 12" | 10" | 356 | ✓ | ✓ | ✓ |
| 14" | 10" | 406 | — | ✓ | ✓ |
| 14" | 12" | 406 | ✓ | ✓ | ✓ |
| 16" | 12" | 457 | — | ✓ | ✓ |
| 16" | 14" | 457 | ✓ | ✓ | ✓ |
All dimensions in mm. Marks reproduced exactly as printed 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.
Flat side down where the line must drain; flat side up on a pump suction so vapour is not trapped against the top of the pipe.
Yes — the catalogue lists the same face-to-face figures for both, so the two are interchangeable on length.
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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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