PE-Steel Transition Fitting
PE-to-steel threaded transition fitting for secure, gas-tight jointing between polyethylene pipelines and steel meters, risers, and valves in gas networks.
- Factory-assembled high-integrity mechanical joint between PE pipe and threaded steel pipe
- Guaranteed gas-tight seal between polymer and steel via internal seals and hydraulic crimping
- Heavy-duty anti-corrosion protective coating on the steel section for buried environments
- Manufactured to strict natural gas distribution criteria under EN 1555-3
- Rapid field installation via electrofusion on the PE spigot and threaded assembly on the steel side
Key Specifications
- Product code
- P057
- Reference standard
- EN 1555-3
- Material & grade
- PE
- Outside diameter
- 20–63 mm
- Nominal size
- 1/2 to 2 inch
- Joint type
- Electrofusion
- Unit of sale
- Piece
- Applications
- Gas distribution
- Dimensional options
- 6 rows in the specification table
Structure and safety of PE-steel transition fittings
The transition fitting is a factory-manufactured hybrid fitting securely coupling high-density polyethylene to carbon steel. In natural gas networks, main distribution mains are constructed from buried PE, while risers, meter sets, and regulator stations require steel pipe. Direct field joining of these disparate materials is prohibited due to differing thermal expansion rates; certified transition fittings are mandatory.
During factory production, the serrated steel insert is pressed into the PE tube under immense hydraulic force, supported by internal elastomeric seals and an external compression sleeve. In conformance with EN 1555-3, each assembly undergoes stringent tensile pull tests and pneumatic leak tests to verify zero gas permeability.
Sizing range and installation recommendations
Transition fittings are typically supplied with polyethylene spigots (od_mm) from 20 to 63 mm mated to male or female steel threads (nominal_size_in) from 1/2 inch to 2 inches (including 1/2, 3/4, 1, 1-1/4, 1-1/2, and 2 inches), matching standard domestic and industrial service risers.
On site, the PE spigot is jointed into the mains via an electrofusion coupler, while the threaded steel end connects to downstream metal piping. Overheating the polymer interface during any nearby metal welding or threading must be strictly avoided. Enter your PE diameter and thread size in our quote form for submittals.
PE-Steel Transition Fitting — Technical Specifications
Wall thickness and weight are calculated from the standard series and are approximate; final values are confirmed in the quotation.
| Outer Diameter (mm) | Nominal Size (inch) |
|---|---|
| 20 | 1/2 |
| 25 | 3/4 |
| 32 | 1 |
| 40 | 1-1/4 |
| 50 | 1-1/2 |
| 63 | 2 |
PE-Steel Transition Fitting — FAQ
What sizes are standard for PE-to-steel transition fittings?
These fittings are typically manufactured with PE outside diameters from 20 to 63 mm and steel threads from 1/2 up to 2 inches.
Can a PE-to-steel transition joint be fabricated on the jobsite?
No, safety regulations prohibit field fabrication; transition fittings must be factory-crimped and pressure-tested under certified quality controls.
What protective coating is applied to the steel portion?
The steel barrel is coated with high-build epoxy, hot-dip galvanizing, or protective polymer wrap to prevent soil corrosion.
How is the polyethylene end connected to the pipeline?
The plain polyethylene spigot end is welded into the pipeline using a standard electrofusion coupling.
