Introducing the Style 721 Transition Fitting…
For Fast, Trouble-free Steel to PE Transition Connections
Fully Qualified to ASTM F1973
Category 1 Specifications
Dresser introduces the Style 721 Transition Fitting for quick, reliable Steel to PE transition connections for gas distribution mains. They are engineered
for full compliance with the attendant gas distribution industry standard ASTM F1973. The Style 721 steel bodies are coated with Dresser ALCLAD™ fusion bonded epoxy with 2” layback for field welding. The weld end comes factory-beveled.
The monolithic body design simplifies traceability and removes any requirement to qualify, track and trace additional pressure containing components. The heat code for the steel is stamped in the tailpiece adjacent to the weld prep assuring 100% traceability of the pressure containing metallic content. This design enhancement also reduces weight of the finished fittings.
Dresser Style 721 fittings are offered for nominal pipe sizes 3” thru 12” (standard wall steel) x SDR11 polyethylene (medium density 2708 and high density 4710). Other dimension ratios and steel end preparations can be accommodated upon request.
- ASTM F2897 traceability information will be listed on each fitting
- The bevel will be industry standard weld-prep angle: 30 – 37.5 degrees
Dresser Style 721 Transition Fitting Specifications
| Nominal Pipe Size (in) | A Steel Length Min. (in) | B PE Length Min. (in) | C Overall Length (in) | Steel Wall Thickness SCH 40 (in) | Weight Shipping (EA) (lbs) |
|---|---|---|---|---|---|
| 3 | 9 | 12 | 27 | 0.216 | 12 |
| 4 | 9 | 12 | 27 | 0.237 | 18 |
| 6 | 9 | 18 | 33 | 0.280 | 35 |
| 8 | 9 | 24 | 42 | 0.322 | 70 |
| 12 | 9 | 24 | 46 | 0.375 | 155 |
NOTE: Nominal size 12 noted in RED is in development as of this release. Please contact your Dresser sales representative or visit us at www.dresserutility.com for latest product updates and availability.
Required data for all product inquiries and ordering Dresser Style 721 transition fittings:
- Pipe size
- PE cell classification (2708 or 4710)
- Dimension ratio required (SDR 11 standard)
- Approved extruder(s) for PE pipe
- Steel pipe wall thickness if not compatible with standard wall/Schedule 40
- Any special requirements or custom configurations
Traceability Compliance
The ASTM F2897 encoding from the polyethylene pipe’s print line is duplicated on a supplemental label to assure that traceability of the plastic material is also easily maintained. The fitting itself is marked with bar codes and alphanumeric data as per ASTM F2897. This facilitates compliance with current and future regulations as well as your company specific materials traceability protocol.