Sajed as a leading manufacturer of steel butt-weld fittings
Sajed supplies a complete range of elbows, tees, reducers, caps (end caps), male-thread adapters and pipe clamps in multiple pressure classes. Automated lines and rigorous quality control deliver dimensional stability, high mechanical strength, and conformity with national and international standards—proven across public and private infrastructure projects.
Materials & manufacturing
- Carbon steel ST37 or equivalent grades for balanced weldability and mechanical strength
- Welded (ERW) process for medium-pressure services
- Seamless (Mannesmann) process for high-pressure and high-temperature lines; no weld seam reduces stress concentration
- Heat treatment and final machining to equalize wall thickness and prepare weld ends
Standards compliance
| Application area | Key standard | Key provisions |
|---|---|---|
| Urban gas distribution | ISIRI 3076 (Iran) | Hydrostatic test, leak performance at operating pressure, thread dimensions |
| High-pressure oil & gas | API 5L / ASME B16.9 | Chemical composition control, tensile and bend tests |
| Water & wastewater industries | DIN 2605 / EN 10253 | Corrosion resistance, protective coatings, dimensional tolerances |
Competitive advantages of Sajed fittings
- High cyclic endurance: resists water-hammer and alternating pressure loads
- Broad size range 1/2 to 8 in, with custom larger dimensions on request
- Custom surface finishes: epoxy coating, hot-dip galvanizing, or sand-blasting for enhanced corrosion resistance
- Full product traceability with Heat Number stamped on the body for metallurgical tracking
Technical specifications — core products
| Product | Size range (in) | Type / Angle | Max nominal pressure (bar) | Usage note |
|---|---|---|---|---|
| 45°/90°/180° Elbow | 1/2 – 8 | Welded & Seamless | 25 / 63 | Change pipe direction in tight spaces |
| Equal & Reducing Tee | 1/2 – 8 | Butt-Weld | 25 / 63 | Branching with minimal pressure loss |
| Concentric Reducer | Inlet 1/2 – Outlet 8 | Seamless | 40 / 63 | Match unequal diameters on a common axis |
| Cap (End Cap) | 1/2 – 8 | End Cap | 25 / 63 | Pipe end closure for hydrostatic testing |
| Male-thread adapter (one-end male) | 1/2 – 4 | NPT/BSP | 16 / 25 | Transition from welded to threaded lines |
| Pipe Clamp | 1/2 – 8 | Saddle / U-Shape | — | Vibration restraint and pipe support |
Nominal pressure values are listed for the “welded” line first and the “seamless” line second.
Major application areas
Building services
Standard Sajed butt-weld elbows and tees in risers and domestic gas networks enhance safety against leaks and transient pressures. Sajed caps are used for end-of-line hydrostatic tests.
Oil, gas & petrochemical
Seamless Sajed fittings—free of weld seams—are the first choice for transmission lines and process units where design pressures up to 63 bar and operating temperatures up to 400 °C are common.
Water, wastewater & fire protection
Carbon steel with hot-dip galvanizing or epoxy coating provides strong resistance to raw-water and chemical media, enabling long service life in treatment plants and industrial sewer networks.
ERW vs. seamless — at a glance
| Feature | Welded (ERW) | Seamless (Mannesmann) |
|---|---|---|
| Manufacturing method | Plate rolling + longitudinal weld | Solid billet, seamless forming |
| Recommended max pressure | Up to 25 bar | 63 bar and higher |
| Final weight | Lighter | Heavier (uniform wall thickness) |
| Project suitability | Optimized for standard utility services | Preferred for critical, high-risk lines |
| Sample applications | Building piping, fire protection | Oil & gas, high-pressure steam |
Selection & installation guidelines
- Match design pressure and temperature with the data above before ordering
- Verify markings: clear Heat Number, Sajed logo, and standard on the fitting
- Bevel preparation: 37.5° to ensure full weld penetration
- Preheat / PWHT: for wall thickness > 12 mm, preheat up to 150 °C and perform stress relief after welding per procedure
Maintenance & periodic inspection
- Visual Testing (VT) every six months on lines exposed to vibration
- Ultrasonic Testing (UT) annually for critical seamless lines
- Renew protective coatings in humidity above 70% or corrosive environments
Tamam Baha maintains continuous stock of Sajed butt-weld fittings at its central warehouse. As one of several distribution channels in the market, it also provides technical support to help buyers select the right option based on pressure, temperature, and project standards.
