The MSS SP-97 Weldolet is an integrally reinforced forged branch connection fitting engineered to establish a 90-degree buttweld branch outlet onto a run pipe header. Standardized under the Manufacturers Standardization Society (MSS) Standard Practice SP-97, these branch outlet fittings are designed specifically to meet the stringent area replacement rules of ASME B31.1 (Power Piping) and ASME B31.3 (Process Piping) without requiring external reinforcing pads or welded wrappers.
Rajtilak Metal has forged, heat-treated, and CNC-machined high-integrity MSS SP-97 branch fittings in Mumbai, India since 1991. Sourced for offshore platforms, refinery expansions, and extreme-pressure pipelines worldwide, our Weldolets minimize stress concentrations via an engineered transition taper while delivering full mill traceability backed by complete EN 10204 3.1 certification.
Certified ISO 9001 quality infrastructure, approved by Engineers India Limited (EIL) and Indian Boiler Regulations (IBR), with extensive supply history for ADNOC, Aramco, and global EPC projects.
Modern process design demands maximum structural reliability under thermal cycling, hydraulic surge, and external bending moments. Discover how integrally reinforced forgings outclass alternatives.
Installing an ASME B16.9 reducing tee requires cutting the main line and welding three full circumferential buttwelds. A Weldolet requires only a single contoured attachment weld to the header, immediately cutting fabrication labor by 60% and halving radiography and ultrasonic NDT requirements.
Fabricated pipe-to-pipe stub-in connections generate extreme stress risers at the sharp junction crotch, leading to fatigue cracks. An MSS SP-97 Weldolet features a hydrodynamic funnel taper and broad reinforcing crotch wall that distributes hoop and torsional stresses uniformly across the pipe wall.
MSS SP-97 incorporates engineered run pipe size consolidation ranges. For instance, a 2″ branch Weldolet contoured for 10″–36″ header pipes satisfies multiple run curvatures with zero field modification, slashing jobsite warehouse stocking requirements and expediting emergency plant turnarounds.
Every branch connection manufactured at Rajtilak Metal is engineered to match or exceed the burst pressure rating of seamless run pipe. Review standard sizes, wall schedules, and material grades.
| Branch Size (NPS) | Header Range (Run NPS) | Design Rating / Class | Buttweld End Preparation | Common ASTM / ASME Material Specifications |
|---|---|---|---|---|
| 1/2″ (DN 15) | 36″ – 1/2″ (Consolidated) | STD, XS, SCH 160 | ASME B16.25 Plain Bevel 37.5° | ASTM A105, A350 LF2, A182 F304L/F316L, A182 F11/F22 |
| 3/4″ (DN 20) | 36″ – 3/4″ (Consolidated) | STD, XS, SCH 160 | ASME B16.25 Plain Bevel 37.5° | ASTM A105, A350 LF2, A182 F316L, Duplex 2205 (UNS S31803) |
| 1″ (DN 25) | 36″ – 1″ (Consolidated) | STD, XS, SCH 160, XXS | ASME B16.25 Plain Bevel 37.5° | ASTM A105, A182 F316/316L, Inconel 625, Hastelloy C276 |
| 1-1/2″ (DN 40) | 36″ – 1-1/2″ (Consolidated) | STD, XS, SCH 160, XXS | ASME B16.25 Plain Bevel 37.5° | ASTM A105N, A350 LF2 Cl.1, A182 F321, Duplex 2507 |
| 2″ (DN 50) | 48″ – 2″ (Consolidated) | STD, XS, SCH 160, XXS | ASME B16.25 Compound Bevel (for >22mm) | ASTM A105, A182 F11 Cl.2, A182 F22 Cl.3, Titanium Gr.2 |
| 3″ (DN 80) | 48″ – 3″ (Consolidated) | STD, XS, SCH 160, XXS | ASME B16.25 Plain / Compound Bevel | ASTM A105, A350 LF2, A182 F316L, Monel 400, Alloy 20 |
| 4″ (DN 100) | 48″ – 4″ (Consolidated) | STD, XS, SCH 160, XXS | ASME B16.25 Plain / Compound Bevel | ASTM A105, A182 F304L/F316L, 904L, Chrome Moly F91 |
| 6″ – 24″ (DN 150–600) | Custom Curvatures to 72″ | STD, XS, Custom SCH | ASME B16.25 Compound Bevel | Carbon Steel, Low-Temp, Super Duplex, High-Nickel Alloys |
Every industrial piping system presents distinct corrosion and pressure hazards. We maintain comprehensive billet stocks across prime alloy categories for accelerated delivery schedules.
Engineered for superheated steam headers, coker units, and catalytic cracker piping subject to thermal fatigue and creep.
Resistant to pitting, crevice corrosion, and chloride-induced stress corrosion cracking in marine and chemical handling environments.
Impact-qualified down to -50°F for LNG terminals, liquid nitrogen loops, and aggressive acid environments.
As global energy transitions evolve alongside deepwater exploration and digital refinery infrastructure, the procurement criteria for MSS SP-97 Weldolets have shifted rapidly. Procurement teams and engineering directors now face newer compliance regimes:
Tour our hot forging hammers, computer-controlled heat treatment furnaces, and state-of-the-art CNC machining lines dedicated to manufacturing ASME and MSS pipe fittings.
Forged at strictly monitored temperatures to refine grain structure and maximize mechanical toughness across the crotch zone.
Full normalizing, solution annealing, or quenching and tempering to eliminate residual forging stresses and satisfy hardness limits.
Multi-axis CNC turning ensures the weld saddle contour perfectly matches the header outside diameter for effortless fit-up.
For high-pressure hydrocracker, offshore gas production, or nuclear cooling systems, component failure is never an option. Rajtilak Metal guarantees absolute traceability on every single MSS SP-97 Weldolet delivered to our customers.
Before packing in moisture-barrier seaworthy crates, each Weldolet is low-stress stamped with the Rajtilak trade logo, nominal branch size, header run size consolidation range, material specification, heat charge number, and schedule rating. This physical marking matches line-by-line with the supplied EN 10204 3.1 Mill Test Certificate.
Dual-melt analysis verifying C, Mn, Cr, Ni, Mo and carbon equivalent.
Tensile, yield, elongation, and sub-zero Charpy V-notch evaluations.
100% Magnetic Particle (MPI) or Liquid Penetrant (DPI) surface check.
Optical verification of 37.5° bevel and root face contour geometry.
Our metallurgy specialists review project piping classes, NACE MR0103/MR0175 sour criteria, and PWHT requirements before forging begins to guarantee zero specification mismatch.
Stockholding extensive inventories of semi-machined forged blanks in ASTM A105, A350 LF2, 304L, 316L, and Duplex allows rapid machining and dispatch in emergency maintenance situations.
Certified ISO 9001 quality framework with frequent on-site inspection and sign-off by international agencies including Lloyd’s Register, Bureau Veritas, DNV, TUV, and SGS.
We export routinely to oil, gas, chemical, and marine processing giants throughout Saudi Arabia, the United Arab Emirates, Qatar, Oman, Turkey, Egypt, Malaysia, Singapore, Indonesia, Poland, Italy, the United Kingdom, and North America. Request your rapid quote today.
Answers to common questions submitted by piping designers, procurement managers, and mechanical QA/QC inspectors.
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