Dip Pipes & Dip Legs
Dip Pipes & Dip Legs
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Full technical data and dimensions
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PTFE Lined Dip Pipe
Straight lined dip pipe, NB 1" to 6", to 5800 mm
Straight lined dip pipe that reaches below the liquid level of a vessel — NB 1" to 6" bore on NB 1.5" to 24" nozzles, lengths 150 mm to 5800 mm.
| Product type | Straight lined dip pipe |
|---|---|
| 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" to NB 6" on NB 1.5" to 24" nozzles |
Product overview
What it does, and where it fits.
A dip pipe passes through a vessel nozzle and delivers or withdraws fluid below the liquid surface. Charging above the surface splashes, foams and creates aerosols; charging below it does not. On corrosive duty the dip pipe is fully immersed in the batch, so it has to be lined over its whole length.
The item is specified by two bores: NB₁ is the dip pipe itself, NB₂ the vessel nozzle it mounts on. Face-to-face X is 150 mm across the range, and the immersed length runs from a 150 mm minimum to 5800 mm at the smaller bores.
The catalogue lists this item in PTFE with a liner to ASTM D 1457. An angular spool option allows tilting up to 20°, and divertors, extended flares and anti-siphon holes are available on request.
Features
Built into every unit.
- PTFE liner to ASTM D 1457 over an ASTM A 106 Gr. B carbon steel body
- NB 1" to 6" dip pipe on NB 1.5" to 24" vessel nozzles
- Immersed length to 5800 mm in the smaller bores
- Angular spool option for tilting up to 20°
- Divertors, extended flares and anti-siphon holes on request
Benefits
Why it earns its place in the line.
- Eliminates splashing, foaming and aerosol generation on charging
- Fully lined over the immersed length — no exposed steel in the batch
- 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
- Sub-surface charging of reagents into reactors
- Gas sparging and dispersion below the liquid level
- Bottom withdrawal from storage and mixing vessels
- Preventing splashing, foaming 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 Pipe.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Straight lined dip pipe |
|---|---|
| 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" to NB 6" on NB 1.5" to 24" nozzles |
| 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 | Straight dip pipe |
| Face to face | 150 mm |
| NB₁ | NB₂ | Face to face X (±2) | Length min (±2) | Length max (±2) | PTFE |
|---|---|---|---|---|---|
| 1" | 1.5"–24" | 150 | 150 | 5800 | ✓ |
| 1.5" | 2"–24" | 150 | 150 | 5800 | ✓ |
| 2" | 3"–24" | 150 | 150 | 5800 | ✓ |
| 2.5" | 3"–24" | 150 | 200 | 5700 | ✓ |
| 3" | 4"–24" | 150 | 200 | 5700 | ✓ |
| 4" | 6"–24" | 150 | 200 | 5700 | ✓ |
| 6" | 8"–24" | 150 | 300 | 3000 | ✓ |
All dimensions in mm. NB₁ is the dip pipe bore, NB₂ the range of vessel nozzle sizes it can be mounted on.
Available on request
- Angular spool option for tilting up to 20°
- Divertors and extended flares
- Anti-siphon holes
FAQ
Questions we are asked about this item.
The range of vessel nozzle sizes the dip pipe can be mounted on. An NB 2" dip pipe, for example, is listed against nozzles from NB 3" to 24".
It lets the dip pipe be tilted up to 20° from vertical, which is useful where an agitator, baffle or existing internal prevents a straight vertical drop.
It breaks the siphon so the vessel cannot drain back through the dip pipe when the supply is shut off. Specify it if the dip pipe outlet sits below the source liquid level.
Related products
Commonly specified alongside PTFE Lined Dip Pipe.
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Dip Pipes & Dip Legs
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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.
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