Dip Pipes & Dip Legs
Lined Pipes & Spools
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Full technical data and dimensions
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PTFE Lined Dip Leg
Lined dip leg to 3000 mm, NB 1/2" to 16"
Lined leg for introducing or withdrawing fluid below the liquid surface of a vessel — one flanged end, lengths to 3000 mm, NB 1/2" to 16".
| Product type | Lined dip leg |
|---|---|
| Body / steel grade | ASTM A 106 Gr. B pipe, IS 2062 plate / ASTM A 105 flanges |
| Lining material | PTFE |
| Liner standard | ASTM D 1457 / ASTM D 4894-19 |
| 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 dip leg carries fluid below the liquid level of a reactor or storage vessel so that gas is dispersed into the batch, or liquid is drawn from beneath the surface, rather than splashing onto it. The lined version presents only PTFE to the batch over its whole immersed length.
It is supplied with a carbon steel body to ASTM A 106 Gr. B, IS 2062 or ASTM A 105 flanges, and a PTFE liner to ASTM D 1457. Lengths run to 3000 mm across the entire NB 1/2" to 16" range.
Features
Built into every unit.
- PTFE liner to ASTM D 1457 over a carbon steel body
- Lengths to 3000 mm in every bore from NB 1/2" to 16"
- ASME/ANSI B16.5 Class 150 flange
- Zinc epoxy primed external surface
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
- Sub-surface addition of reagents to a reactor batch
- Gas sparging below the liquid level
- Bottom withdrawal from storage and mixing vessels
- Avoiding splashing and aerosol formation on charging
Industries served
- Chemical processing
- Pharmaceutical
- Petrochemical
- Oil & gas
- Power generation
- Pulp & paper
- Mining & metallurgy
- Agrochemicals & dyes
Technical data
Specification for PTFE Lined Dip Leg.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Lined dip leg |
|---|---|
| Body / steel grade | ASTM A 106 Gr. B pipe, IS 2062 plate / ASTM A 105 flanges |
| Lining material | PTFE |
| Liner standard | ASTM D 1457 / ASTM D 4894-19 |
| 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 |
| Maximum length | 3000 mm |
| Size (NB₁) | Length max (±2) | PTFE |
|---|---|---|
| 0.5" | 3000 | ✓ |
| 0.75" | 3000 | ✓ |
| 1" | 3000 | ✓ |
| 1.5" | 3000 | ✓ |
| 2" | 3000 | ✓ |
| 2.5" | 3000 | ✓ |
| 3" | 3000 | ✓ |
| 4" | 3000 | ✓ |
| 6" | 3000 | ✓ |
| 8" | 3000 | ✓ |
| 10" | 3000 | ✓ |
| 12" | 3000 | ✓ |
| 14" | 3000 | ✓ |
| 16" | 3000 | ✓ |
All lengths in mm. The catalogue lists this item in PTFE only.
Available on request
- Higher diameters on request
FAQ
Questions we are asked about this item.
The catalogue lists the dip leg in PTFE only. Tell us your duty if you need PFA or FEP and we will confirm what can be produced.
A dip pipe is a two-branch item with its own nozzle size (NB₂) that mounts through a vessel nozzle; a dip leg is a plain lined leg supplied to length.
Related products
Commonly specified alongside PTFE Lined Dip Leg.
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Dip Pipes & Dip Legs
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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