SS Pipe Fittings and Flanges — The Complete Piping System Kit
A pipe alone is just a tube. Fittings change direction, branch lines, reduce size, and terminate runs. Flanges create bolted, demountable connections for valves, equipment, and maintenance access. Together with pipes, they form the complete piping system that carries process fluids in every industrial plant. As India's trusted SS pipe fittings flanges supplier, stainless steel pipe manufacturer, and SS pipe supplier in Vadodara, Creative Metal Industries stocks the full range of fittings and flanges in all standard grades and pressure classes.
Types of Pipe Fittings
| Fitting Type | Function | Standard | Sizes |
|---|---|---|---|
| 90° Elbow (LR) | Changes direction 90°, long radius (R=1.5D) | ASME B16.9 | 1/2" to 48" |
| 90° Elbow (SR) | Changes direction 90°, short radius (R=1D) | ASME B16.9 | 1/2" to 48" |
| 45° Elbow | Changes direction 45° | ASME B16.9 | 1/2" to 48" |
| Equal Tee | Branches line at 90° (same diameter) | ASME B16.9 | 1/2" to 48" |
| Reducing Tee | Branches with smaller branch diameter | ASME B16.9 | 1/2" to 48" |
| Concentric Reducer | Reduces pipe size (centerlines aligned) | ASME B16.9 | 3/4"×1/2" to 48"×42" |
| Eccentric Reducer | Reduces size (one flat side — avoids liquid traps) | ASME B16.9 | 3/4"×1/2" to 48"×42" |
| Cap | Closes/terminates pipe end | ASME B16.9 | 1/2" to 48" |
| Stub End | Used with lap joint flanges for easy dismantling | MSS SP-43 | 1/2" to 24" |
| Coupling (SW/THD) | Joins two small-bore pipes, 3000#/6000# | ASME B16.11 | 1/4" to 4" |
Types of Flanges
| Flange Type | Connection Method | Best For | Pressure |
|---|---|---|---|
| Weld Neck (WN) | Butt-welded to pipe (long tapered hub) | High pressure, high temperature, critical service | All classes to 2500 |
| Slip-On (SO) | Slides over pipe, fillet welded both sides | Low/moderate pressure, easy alignment | Up to Class 600 |
| Socket Weld (SW) | Pipe inserted into socket, fillet welded | Small bore (≤ 2"), high pressure | 3000# / 6000# |
| Blind (BL) | Bolted to close off pipe end | Pressure testing, future connections | All classes |
| Threaded (THD) | Screwed onto threaded pipe end | Low-pressure utility, no welding needed | Up to Class 600 |
| Lap Joint | Used with stub end, bolts only — easy dismantling | Systems requiring frequent maintenance | Up to Class 600 |
| Orifice | Tapped for pressure transmitters | Flow measurement | Up to Class 600 |
Material Grades Available
| Material | Fitting Spec | Flange Spec | Grade |
|---|---|---|---|
| Stainless Steel | ASTM A403 | ASTM A182 | WP304, WP304L, WP316, WP316L, WP321, WP347 |
| Duplex Steel | ASTM A815 | ASTM A182 | WP-S31803, F51 (2205) |
| Super Duplex | ASTM A815 | ASTM A182 | WP-S32750, F53 (2507) |
| Carbon Steel | ASTM A234 | ASTM A105 | WPB, WPC |
| Alloy Steel | ASTM A234 | ASTM A182 | WP11, WP22, WP91, F11, F22, F91 |
| Nickel Alloys | ASTM B366 | ASTM B564 | Inconel 625, Hastelloy C-276, Monel 400 |
Pressure Ratings — ASME B16.5 Flange Classes
| Class | Max Pressure at Ambient (bar) | Max Pressure at 260°C (bar) | Typical Use |
|---|---|---|---|
| 150 | 19.6 | 14.9 | Low-pressure utility, cooling water |
| 300 | 51.1 | 39.8 | Moderate process piping |
| 600 | 102.1 | 79.6 | High-pressure process |
| 900 | 153.2 | 119.4 | HP steam, hydraulic |
| 1500 | 255.3 | 198.9 | Very high pressure |
| 2500 | 425.5 | 331.6 | Extreme pressure, testing |
Values for Group 1.1 materials (CS/SS). Actual ratings vary with material group and temperature — refer to ASME B16.5 Table 2.
Applications by Industry
Chemical Processing
SS 316L fittings/flanges for acid, alkali, and chloride service. Duplex for high-chloride.
Oil & Gas
CS WPB fittings + A105 flanges for process piping. Alloy WP91 for high-temp lines.
Pharmaceutical
316L electropolished fittings. Hygienic clamp + tri-clamp connections. Ra ≤ 0.8µm.
Food Processing
SS 304 fittings for dairy, brewery, food. Sanitary design with crevice-free joints.
Power Plants
A234 WP91 fittings + A182 F91 flanges for main steam. IBR Form III-C certified.
Marine & Offshore
Super Duplex 2507 fittings + F53 flanges for seawater handling systems.
Why Source Fittings & Flanges from Creative Metal Industries?
- Complete range: Buttweld fittings (A403/A234), forged fittings (A182, B16.11), flanges (A182/A105, B16.5/B16.47) — all from one supplier
- All grades: SS 304/316L, Duplex F51, Super Duplex F53, CS A105/WPB, Alloy F11/F22/F91, Inconel, Monel, Hastelloy
- All classes: Class 150 through 2500. SCH 5S through XXS for buttweld. 3000#/6000#/9000# for forged
- Matching pipes: We're a stainless steel pipe manufacturer + fittings/flanges stockist = single-source for complete piping spools
- IBR certified: Fittings and flanges with IBR Form III-C for boiler piping applications
- Ready stock: Common sizes (1/2" to 12", Class 150-600) dispatch same day from our Vadodara warehouse
Frequently Asked Questions
What are the most common types of SS pipe fittings?
Buttweld (ASTM A403, B16.9): 90° elbows LR/SR, 45° elbows, tees, reducers, caps, stub ends. Socket weld (A182, B16.11): 90° elbows, tees, couplings, unions, plugs — 3000# and 6000# for small bore (≤ 2").
Weld Neck vs Slip-On flange — what's the difference?
Weld Neck: butt-welded, long hub, strongest — for high pressure/temperature/cyclic service. Slip-On: slides over pipe, fillet welded — cheaper, easier alignment, but lower rated. Use WN for critical process; SO for low-pressure utility.
What pressure classes are available?
ASME B16.5: Class 150, 300, 600, 900, 1500, 2500 (sizes 1/2" to 24"). B16.47: Class 75 to 900 (26" to 60"). Class 150 ≈ 20 bar ambient. Class 2500 ≈ 430 bar. Higher class = thicker flange + more bolts.
Need SS Pipe Fittings & Flanges?
All types, all grades, all classes. Ready stock Vadodara. Matching pipes available. Single-source piping supply.