Lined Pipes & Spools
Lined Pipes & Spools
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PTFE Lined Jacketed Spool Pipe
Steam or thermic-fluid jacketed lined spool, NB 1/2" to 16"
Lined spool inside a heating or cooling jacket, with inlet and outlet nozzles — for process fluids that must be held above their crystallisation point or below their decomposition point along the whole run.
| Product type | Jacketed lined spool pipe |
|---|---|
| Body / steel grade | ASTM A 106 Gr. B pipe, IS 2062 plate / ASTM A 105 flanges |
| 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 1/2" to NB 16" |
Product overview
What it does, and where it fits.
A jacketed lined spool is a lined spool pipe enclosed in a second carbon steel shell fitted with inlet and outlet nozzles. Steam, hot oil or chilled fluid circulates in the annulus, holding the process fluid at temperature over the entire length of the run rather than only at the vessels.
The inner pipe is lined exactly as a standard spool — PTFE, PFA or FEP flared over both flange faces — so the wetted path is unchanged. The jacket carries its own vent hole, and the assembly keeps the ASME/ANSI B16.5 Class 150 flange pattern of the unjacketed item so it drops straight into an existing line.
Because the jacket adds stiffness, jacketed spools are supplied in longer face-to-face lengths than plain spools: 500 mm to 6000 mm in the smaller bores, tapering to 2000 mm at NB 16".
Features
Built into every unit.
- Lined inner pipe inside a carbon steel heating or cooling jacket
- Jacket inlet and outlet nozzles with vent hole
- Face-to-face lengths to 6000 mm in bores up to NB 6"
- Same B16.5 Class 150 flange pattern as the plain lined spool
- PTFE, PFA or FEP liner on the full NB 1/2" – 16" range
Benefits
Why it earns its place in the line.
- Holds viscous or crystallising products above their setting point for the whole run
- Prevents cold spots that cause blockage and batch loss
- 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
- Molten sulphur, caustic and crystallising salt solutions
- Viscous polymers and resins that must be kept warm
- Temperature-sensitive intermediates needing controlled cooling
- Long transfer lines between heated vessels
Industries served
- Chemical processing
- Pharmaceutical
- Petrochemical
- Oil & gas
- Power generation
- Pulp & paper
- Mining & metallurgy
- Agrochemicals & dyes
Technical data
Specification for PTFE Lined Jacketed Spool Pipe.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Jacketed lined spool pipe |
|---|---|
| Body / steel grade | ASTM A 106 Gr. B pipe, IS 2062 plate / ASTM A 105 flanges |
| 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 1/2" to NB 16" |
| 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 |
| Face to face | 500 mm minimum to 6000 mm maximum, size dependent |
| Standard version | 1 fixed flange and 1 lap joint flange, jacketed body |
| Jacket | Carbon steel with inlet and outlet nozzles and vent hole |
| Size | Length L min (±2) | Length L max (±2) | PTFE | PFA | FEP |
|---|---|---|---|---|---|
| 0.5" | 500 | 6000 | ✓ | ✓ | ✓ |
| 0.75" | 500 | 6000 | ✓ | ✓ | ✓ |
| 1" | 500 | 6000 | ✓ | ✓ | ✓ |
| 1.5" | 500 | 6000 | ✓ | ✓ | ✓ |
| 2" | 500 | 6000 | ✓ | ✓ | ✓ |
| 2.5" | 500 | 6000 | ✓ | ✓ | ✓ |
| 3" | 600 | 6000 | ✓ | ✓ | ✓ |
| 4" | 600 | 6000 | ✓ | ✓ | ✓ |
| 6" | 600 | 6000 | ✓ | ✓ | ✓ |
| 8" | 600 | 3000 | ✓ | ✓ | ✓ |
| 10" | 600 | 3000 | ✓ | ✓ | ✓ |
| 12" | 600 | 3000 | ✓ | ✓ | ✓ |
| 14" | 600 | 3000 | ✓ | ✓ | ✓ |
| 16" | 600 | 2000 | ✓ | ✓ | ✓ |
All lengths in mm. Maximum length reduces with bore because of jacket weight and handling.
Available on request
- Flange connection: 2 fixed flanges, or 2 loose flanges
- ANSI B16.5 Class 300 flanges
- Stainless steel body
FAQ
Questions we are asked about this item.
Low-pressure steam, hot thermic fluid or chilled fluid. Tell us the service medium, its temperature and pressure and we will confirm the jacket design and nozzle size.
Weight and handling. A jacketed NB 16" spool is a heavy assembly, so the catalogue limits it to 2000 mm face to face, against 6000 mm for bores up to NB 6".
The liner is rated for continuous service to 260 °C, which is well above normal steam-jacket temperatures. Confirm the jacket medium temperature with us if it exceeds that.
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Enquiry
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Send the bore, the media, the temperature and pressure, and the flange standard you work to. Drawings and custom sizes welcome.
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