Standards and grades

Butt weld fittings in mild steel for general plumbing, HVAC, fire protection, and low-pressure industrial use. Covers the B (Medium) and C (Heavy) wall classes of this range; the steel is IS 2062 Gr. A.

• Class B (Medium): Working pressure ~42 bar cold water
• Class C (Heavy): Working pressure ~63 bar cold water
• Sizes: ½" NB to 6" NB standard range
• Radius: 1.25D (mild steel range)
• End connection: Butt weld, bevelled ends
• Hydrostatic test at 1.5× design pressure before supply

Covers the full range of industrial butt weld fittings (elbows, tees, reducers, caps, returns) in carbon steel, alloy steel, and stainless steel from ½" to 48" NB.

• Applies to NPS ½" through 48" (DN 15 through DN 1200)
• Schedule wall: STD / XS / XXS plus full SCH range
• Radius: Long Radius (LR) 1.5D and Short Radius (SR) 1.0D elbows
• Dimensional tables are the only source of 'legal' wall thickness
• No pressure-temperature rating: use ASME B31.3 / B31.1 with pipe schedule
• End prep: per ASME B16.25 bevel

The dominant flange standard in India for water, HVAC, and general utility service. Widely used on government tenders and municipal infrastructure projects.

• Table D: ~10 bar (the most common table in India)
• Table E: ~16 bar (medium pressure)
• Table F: ~25 bar (higher pressure)
• Flat face (FF) with full-face gasket is the default
• Bolt pattern and PCD differ from ASME B16.5: not interchangeable
• Material: IS 2062 Gr. A / mild steel standard

The global standard for pressure-rated flanges. Defines seven pressure classes (150 through 2500) with pressure-temperature ratings for multiple material groups.

• Pressure classes: 150 / 300 / 400 / 600 / 900 / 1500 / 2500
• P-T ratings vary by material group and temperature
• Carbon steel A105 (Group 1.1) @ 38°C: Class 150 ~20 bar, Class 300 ~51 bar; stainless and alloy groups rate differently
• Raised Face (RF) is the standard facing type
• Ring Type Joint (RTJ) for high-pressure critical service
• Bolt torque and gasket requirements are user's responsibility

Covers socket weld and threaded forged fittings in Class 2000#, 3000#, 6000#, and 9000# for small bore high-pressure service.

• Classes: 2000# (threaded only), 3000#, 6000#, 9000#
• Socket weld: ½" to 4" NB; Threaded: ¼" to 4" NB
• Material: ASTM A105N (carbon steel), A182 F304/316 (stainless)
• Gap of 1.5 mm required between pipe and socket bottom before welding
• Single fillet weld at socket face: no back-welding possible
• No pressure-temperature rating: determined by pipe schedule

Covers Weldolet, Sockolet, Threadolet, Elbolet, Nipolet, and Latrolet branch connection fittings. Self-reinforcing; no separate reinforcement pad needed within rating tables.

• Weldolet: butt weld branch (no fillet); highest integrity
• Sockolet: socket weld branch
• Threadolet: threaded branch
• Elbolet: branch on elbow (for pig traps and instrumentation)
• Nipolet: integrated nipple for vent/drain without extra coupling
• Run-to-branch ratio determines reinforcement adequacy

Tri-Clamp (TC) is the global standard for quick-release hygienic connections in food, beverage, dairy, and pharmaceutical applications.

• Two ferrules + one clamp + one gasket = complete joint
• Gasket materials: silicone (food), EPDM (steam), PTFE (aggressive chemicals)
• Standard sizes: ½" TC to 6" TC (OD-based sizing, not NB)
• Internal Ra ≤ 0.8 µm standard; ≤0.4 µm for pharma (electropolished)
• CIP: Clean-In-Place at 85–95°C; SIP: Steam-In-Place at 121–135°C
• Clamp styles: single-pin (manual), double-pin (vibration), sanitary wing nut

Traditional European dairy fitting standard. Slot nut and liner seal design. Common in German, Austrian, and continental European dairy equipment.

• Thread: DIN coarse thread with liner groove
• Max pressure: 6 bar; Max temp: 130°C
• Sizes: DN25 to DN150
• Material: 1.4301 (304) or 1.4404 (316L)
• Gasket: EPDM or silicone
• Not directly interchangeable with SMS or IDF

Swedish standard for threaded hygienic pipe couplings (unions) on stainless steel tube, widely used in Scandinavian dairy, brewing and food plants.

• Union of a male part, a nut and a seal ring: opened without cutting the line
• Sized by tube outside diameter; confirm the tube series and wall with the order
• Not directly interchangeable with DIN 11851 or IDF unions