Parker Parflange® F37 – Non-Welded Flange System for ISO 6162 & ISO 6164
Weld-Free, High-Pressure Flanged Connections for Hydrogen, Offshore, and Power Systems
Parker’s Parflange® F37 system offers a complete, high-performance solution for non-welded tube-to-flange connections. Designed for pressure ratings up to 420 bar and tubing up to 273 mm OD, F37 is ideal for hydrogen infrastructure, marine, and industrial applications where leak integrity, safety, and speed of installation matter.
Key Features & Benefits
- No welding, no X-ray inspection required – Saves time, labour, and cost while eliminating hazardous processes.
- Hydrogen-ready – F37 seals resist gap extrusion even under pressure fluctuations (“breathing”), making it ideal for H₂ systems.
- Max service pressure – Up to 420 bar (SAE Code 62 / ISO 6164 pattern).
- Compatible sizes – From 16 mm to 273 mm OD and tube wall thicknesses up to 9 mm.
- Versatile seal options – Available with high-performance F37 seals, bonded seal rings, and optional Retaining Ring system for higher pressures.
- Flare-formed technology – Uses orbital tube forming for accurate, repeatable sealing—no flame, heat, or chemical cleaners needed.
Technical Overview
| Attribute | Details |
| Tube OD Range | 16 mm to 273 mm (½″ to 10″ flanges) |
| Wall Thickness | Up to 9 mm |
| Pressure Rating | Up to 420 bar |
| Seal Technology | F37 Seal (SAE 1000 – 50–70 bar), bonded ring seals, Retaining Ring option |
| Compatible Flange Patterns | SAE J518, ISO 6162-1/2 (3000/6000), ISO 6164 |
| Approvals | DNV, ABS, Lloyd’s Register, Korean Register |
| Material Options | Steel, Stainless Steel (Cr(VI)-free coating) |
Why Parflange® F37 Is Ideal for Hydrogen Applications
- 💨 No hot work: Eliminates flame risk in sensitive H₂ handling environments
- 🔩 No stress corrosion: No welding means no heat-affected zones prone to cracking
- 🌡️ Stable under fluctuating pressure: F37 seals resist extrusion during “breathing”
- 🔁 Fast installation: Ideal for modular hydrogen storage, refueling, and testing systems
- ✅ Environmentally friendly: No acid cleaning, degreasing, or harmful fumes
Market Applications
- Hydrogen production & storage systems
- Offshore H₂ refueling skids & bunkering
- Heavy industrial piping
- Mobile hydrogen engine loops
- Power generation and nuclear installations
- Environmentally sensitive sites with no welding access
Efficiency Benefits Over Welding
Parflange® F37 saves time and cost by eliminating traditional welding steps:
- No tube deburring, welding, or X-ray inspection
- No flushing, acid cleaning, or corrosion inhibitor needed
- Workshop pre-assembly possible with greater joint accuracy
- Reduced downtime during retrofits or servicing
- Easy reassembly with standard tools