Dip Pipes & Re-Entry Tubes
Goel Glass manufactures high-purity Borosilicate 3.3 Dip Pipes and re-entry tubes engineered for liquid addition, reagent dosing, liquid extraction, and reaction sampling in spherical vessels, cylindrical kettles, and pilot plant reactors. Introducing liquids beneath the surface of the reaction mass is critical during hazardous or volatile reactant feeds, preventing flash vaporization, minimizing splash deposition on upper vessel walls, and eliminating static electric charge generation during flammable solvent transfers.
In addition to standard immersion dip pipes, our Short Dip Pipes serve as essential re-entry tubes for condensers, heat exchangers, distillation columns, and phase separators. By channeling returning reflux or fresh feed streams cleanly into the center of the active flow channel, they prevent aggressive condensates from impinging directly onto vessel joints, protecting PTFE envelope gaskets and glass flanges from localized erosion and thermal stress.
Fabricated in compliance with DIN ISO 3585 and ASTM E438 standards, our dip pipes deliver exceptional chemical resistance to harsh mineral acids, halogenated compounds, and organic solvents (excluding HF and hot concentrated caustics). They operate under full vacuum down to -1 bar up to moderate system pressures, and can be customized with specific immersion lengths, angled discharge tips, and calibrated feed orifices.
| CAT.REF. | FOR VESSEL | DN | DN1 | d | L |
|---|---|---|---|---|---|
| DP20/1* | 20 L | 25 | 25 | 12 | 300 |
| DP50/1.5* | 50 L | 40 | 25 | 19 | 400 |
Dimensional Key (Dip Pipes):
- DN: Vessel branch connection size (nominal diameter).
- DN1: External feed inlet connection size.
- d: Internal dip pipe bore diameter (mm).
- L: Immersion length into the vessel (mm).
Short Dip Pipes
Designed as compact re-entry nozzles for glass vessels, distillation column sections, and shell-and-tube heat exchangers to ensure laminar liquid introduction without gasket impingement.
| CAT.REF. | DN | DN1 | d | L | L1 |
|---|---|---|---|---|---|
| DP1/1 | 25 | 25 | 12 | 100 | 100 |
| DP1.5/1 | 40 | 25 | 19 | 100 | 100 |
| DP1.5/1.5 | 40 | 40 | 19 | 100 | 100 |
| DP2/1 | 50 | 25 | 25 | 100 | 100 |
| DP2/1.5 | 50 | 40 | 25 | 100 | 100 |
| DP3/1.5 | 80 | 40 | 37 | 100 | 125 |
| DP4/1 | 100 | 25 | 25 | 100 | 150 |
| DP4/2 | 100 | 50 | 50 | 100 | 150 |
Dimensional Key (Short Dip Pipes):
- DN: Vessel/column branch connection diameter.
- DN1: External feed / service connection diameter.
- d: Internal tube bore diameter (mm).
- L, L1: Insertion depth into vessel and external nozzle length (mm).
Key Features
- Subsurface Feed Protection: Prevents splashing, reduces foaming, and avoids volatile vapor loss during exothermic liquid charging.
- Corrosion-Proof Borosilicate 3.3: Completely inert to all acids, organic compounds, and halogens (except HF and hot alkalis).
- Thermal & Vacuum Rated: Withstands temperatures up to 200°C and full vacuum conditions down to 10-3 mbar.
- Custom Lengths & Geometries: Available with straight, curved, or sparged tips tailored to vessel geometries.
Applications
Used widely in chemical synthesis reactors, solvent extraction units, acid dosing systems, distillation re-entry loops, and liquid sampling lines across laboratory and pilot facilities.