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ASTM A403 Size on Size/Reducing Weldolet Stainless Steel Pipe Fittings
Weldolet are the most common type of branch fitting and are part of the butt welding fixings family and are available in a wide variety of dimensions.
ASTM A403 and MSS SP-97 are two separate standards that are often referenced together when discussing Weldolets. Let's break it down:
ASTM A403:
ASTM A403 is a standard specification for wrought austenitic
stainless steel pipe fittings. It covers various types of fittings,
including butt-welded, socket-welded, and threaded fittings. This
specification defines the requirements for materials, dimensions,
mechanical properties, and testing of stainless steel pipe
fittings.
A weldolet is a branch butt-weld connection fitting that is attached to an output pipe in order to reduce stress concentrations in the piping region. The most frequent type of branch fitting is the weldolet. They’re a type of butt welding fitting that comes in a number of sizes. They are used as an alternative to fittings such as elbows or tees, which can be more complex to install and may require additional support.
Product Information
| Product Name | ASTM A403 MSS SP-97 Weldolet |
| Size Range | Dimension: 1/8” to 36” |
| Wall Thickness | STD Sch40 Sch160 XS XXS |
| Standards | ASTM A403 |
| Grade | WP304/L WP316/L WP310S WP321 |
| Manufacturing Standards | ASME B16.11 Weldolets, MSS SP-97 |
MSS SP-97 Weldolet Dimensions
“Center of Run to Face” Size
| Run Pipe NPS | Run Pipe Schedule | Weldolet Dimensions | |||||||||||
| Size | SCH. | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
| 2″ | STD-40 XS-80 | 70 | |||||||||||
| XXS-160 | 87 | ||||||||||||
| 3″ | STD-40 XS-80 | 84 | 91 | ||||||||||
| XXS-160 | 101 | 119 | |||||||||||
| 4″ | STD-40 XS-80 | 97 | 103 | 111 | |||||||||
| XXS-160 | 114 | 132 | 144 | ||||||||||
| STD-40 | 124 | 130 | 138 | 148 | |||||||||
| 6″ | XS-80 | 124 | 130 | 138 | 165 | ||||||||
| XXS-160 | 141 | 159 | 171 | 192 | |||||||||
| STD-40 | 149 | 156 | 164 | 176 | 183 | ||||||||
| 8″ | XS-80 | 149 | 156 | 164 | 191 | 197 | |||||||
| XXS-160 | 167 | 184 | 197 | 218 | 224 | ||||||||
| STD-40 | 176 | 183 | 191 | 205 | 210 | 218 | |||||||
| 10″ | XS-80 | 176 | 183 | 191 | 218 | 238 | 235 | ||||||
| XXS-160 | 194 | 211 | 224 | 245 | 251 | 265 | |||||||
| STD | 202 | 208 | 216 | 228 | 255 | 245 | 251 | ||||||
| 12″ | XS | 202 | 208 | 216 | 243 | 264 | 267 | 265 | |||||
| XXS-160 | 219 | 237 | 249 | 270 | 276 | 291 | 324 | ||||||
| 14″ | STD | 218 | 224 | 232 | 245 | 251 | 259 | 267 | 270 | ||||
| XS | 218 | 224 | 231 | 239 | 279 | 270 | 278 | 286 | |||||
| 16″ | STD | 243 | 249 | 257 | 270 | 276 | 284 | 292 | 295 | 300 | |||
| XS | 243 | 249 | 257 | 284 | 305 | 293 | 303 | 306 | 319 | ||||
| 18″ | STD | 268 | 275 | 283 | 295 | 302 | 310 | 318 | 321 | 325 | 335 | ||
| XS | 268 | 275 | 283 | 310 | 330 | 321 | 329 | 332 | 338 | 352 | |||
| 20″ | STD | 294 | 300 | 308 | 321 | 327 | 335 | 343 | 346 | 351 | 356 | 376 | |
| XS | 294 | 300 | 308 | 335 | 356 | 346 | 354 | 557 | 364 | 370 | 386 | ||
| 24″ | STD | 345 | 351 | 359 | 372 | 378 | 386 | 394 | 397 | 402 | 406 | 411 | 446 |
| XS | 345 | 351 | 359 | 386 | 406 | 397 | 405 | 408 | 414 | 421 | 429 | 449 | |
Size on Size Weldoet Dimensions and Weight
Sch 40 (sizes in inches, weights in pounds)
| Weldolet Size (inch) | A | B | C | Weldolet weight (lbs) |
| 1/2 | 3/4 | 1 3/8 | 15/16 | 0.15 |
| 3/4 | 7/8 | 1 5/8 | 1 3/16 | 0.25 |
| 1 | 1 1/16 | 2 | 1 7/16 | 0.4 |
| 1 1/4 | 1 1/4 | 2 3/8 | 1 3/4 | 0.7 |
| 1 1/2 | 1 5/16 | 2 7/8 | 2 | 0.8 |
| 2 | 1 1/2 | 3 1/2 | 2 9/16 | 1.5 |
| 2 1/2 | 1 5/8 | 4 1/6 | 3 | 2.25 |
| 3 | 1 3/4 | 4 13/16 | 3 11/16 | 3.75 |
| 3 1/2 | 2 | 5 3/8 | 3 7/8 | 5 |
| 4 | 2 | 6 | 4 3/4 | 6.7 |
| 5 | 2 1/4 | 7 1/8 | 5 9/16 | 8.5 |
| 6 | 2 3/8 | 8 1/2 | 6 11/16 | 14 |
| 8 | 2 3/4 | 10 3/8 | 8 11/16 | 28 |
| 10 | 3 1/16 | 12 9/16 | 10 13/16 | 39 |
| 12 | 3 3/8 | 14 7/8 | 12 13/16 | 65 |
| 14 | 3 1/2 | 16 1/8 | 14 1/16 | 70 |
| 16 | 3 11/16 | 18 1/4 | 16 1/16 | 92 |
| 18 | 4 1/16 | 20 3/4 | 18 5/8 | 125 |
| 20 | 4 5/8 | 23 1/16 | 20 1/16 | 175 |
| 24 | 5 3/8 | 27 7/8 | 25 1/8 | 280 |
| 30 | 5 3/8 | 34 1/16 | 30 7/16 | 440 |
| 36 | 5 3/8 | 34 1/16 | 36 1/2 | 1180 |
Sch XS (sizes in inches, weights in pounds)
| Weldolet Size (inch) | A | B | C | Weldolet weight (lbs) |
| 1/2 | 3/4 | 1.375 | 15/16 | 0.15 |
| 3/4 | 7/8 | 1.625 | 1.1875 | 0.25 |
| 1 | 1.0625 | 2 | 1.4375 | 0.4 |
| 1 1/14 | 1.25 | 2.4375 | 1.75 | 0.7 |
| 1.5 | 1.3125 | 2.875 | 2 | 0.9 |
| 2 | 1.5 | 3.5 | 2.5625 | 1.6 |
| 2 1/2 | 1.625 | 4.0625 | 3 | 2.5 |
| 3 | 1.75 | 4.8125 | 3.6875 | 4.1 |
| 3 1/2 | 2 | 5.375 | 3.875 | 5.1 |
| 4 | 2 | 6 | 4.75 | 7.5 |
| 5 | 2.25 | 7.125 | 5.5625 | 9.5 |
| 6 | 3.0625 | 8.875 | 6.6875 | 15 |
| 8 | 3.875 | 10.625 | 8.6875 | 32 |
| 10 | 3.5 | 12.875 | 10.4375 | 46 |
| 12 | 3.9375 | 15.1875 | 13 | 61 |
| 14 | 4.125 | 16.6875 | 14.3125 | 75 |
| 16 | 4.4375 | 18.875 | 16.5 | 115 |
| 18 | 4.6875 | 21.125 | 18.625 | 130 |
| 20 | 5 | 23.375 | 20.8125 | 187 |
| 24 | 5.5 | 27.875 | 25.125 | 316 |
| 26 | 5.75 | 30.125 | 27.25 | 370 |
Sch 160/XXS (Sizes in inches, weights in pounds)
| Weldolet Size (inch) | A | B | C | Weldolet weight (lbs) |
| 1/2 | 1 1/8 | 1 3/8 | 9/16 | 0.25 |
| 3/4 | 1 1/4 | 1 3/4 | 3/4 | 0.70 |
| 1 | 1 1/2 | 2 | 1 | 0.80 |
| 1 1/4 | 1 3/4 | 2 7/16 | 1 5/16 | 1.25 |
| 1 1/2 | 2 | 2 3/4 | 1 1/2 | 1.75 |
| 2 | 2 3/16 | 3 3/16 | 1 11/16 | 2.15 |
| 2 1/2 | 2 7/16 | 3 13/16 | 2 1/8 | 3.40 |
| 3 | 2 7/8 | 4 3/4 | 2 7/8 | 6.35 |
| 4 | 3 5/16 | 6 | 3 7/8 | 10.50 |
| 5 | 3 11/16 | 7 3/8 | 4 13/16 | 14.25 |
| 6 | 4 1/8 | 8 11/16 | 5 3/4 | 30.25 |
Reducing Weldolet Dimensions
Sch XS (Sizes in inches, weights in pounds)
| Weldolet Size (inch) | A | B | C | Weldolet weight (lbs) |
| 1/8 | 5/8 | 1 | 5/8 | 0.10 |
| 1/4 | 5/8 | 1 | 5/8 | 0.10 |
| 3/8 | 3/4 | 1 1/4 | 3/4 | 0.15 |
| 1/2 | 3/4 | 1 3/8 | 15/16 | 0.20 |
| 3/4 | 7/8 | 1 3/4 | 1 3/16 | 0.30 |
| 1 | 1 1/16 | 2 1/8 | 1 7/16 | 0.50 |
| 1 1/4 | 1 1/4 | 2 9/16 | 1 3/4 | 0.90 |
| 1 1/2 | 1 5/16 | 2 7/8 | 2 | 1.10 |
| 2 | 1 1/2 | 3 1/2 | 2 9/16 | 1.75 |
| 2 1/2 | 1 5/8 | 4 1/16 | 3 | 2.60 |
| 3 | 1 3/4 | 4 13/16 | 3 11/16 | 4.10 |
| 3 1/2 | 1 7/8 | 5 1/4 | 4 | 5.60 |
| 4 | 2 | 6 | 4 3/4 | 6.40 |
| 5 | 2 1/4 | 7 1/16 | 5 9/16 | 10.40 |
| 6 | 3 1/16 | 8 5/16 | 6 11/16 | 23.00 |
| 8 | 3 7/8 | 11 1/2 | 8 11/16 | 37.00 |
| 10 | 3 11/16 | 13 3/16 | 10 7/16 | 46.00 |
| 12 | 4 1/16 | 15 5/8 | 12 1/2 | 61.00 |
| 14 | 3 15/16 | 16 | 13 13/16 | 70.00 |
| 16 | 4 3/16 | 18 3/8 | 15 7/8 | 102.00 |
| 18 | 4 3/8 | 20 3/8 | 17 15/16 | 130.00 |
| 20 | 4 11/16 | 22 15/16 | 20 1/16 | 158.00 |
| 24 | 5 1/2 | 28 1/2 | 24 3/16 | 290.00 |
| 26 | 5 3/4 | 30 1/8 | 27 1/4 | 350.00 |
Sch160/XXS (Sizes in inches, weights in pounds)
| Weldolet Size (inches) | A | B | C | Weldolet weight in lbs |
| 1/2 | 1 1/8 | 1 3/8 | 9/16 | 0.25 |
| 3/4 | 1 1/4 | 1 3/4 | 3/4 | 0.70 |
| 1 | 1 1/2 | 2 | 1 | 0.85 |
| 1 1/4 | 1 3/4 | 2 7/16 | 1 5/16 | 1.25 |
| 1 1/2 | 2 | 2 3/4 | 1 1/2 | 1.75 |
| 2 | 2 3/16 | 3 3/16 | 1 11/16 | 2.15 |
| 2 1/2 | 2 7/16 | 3 13/16 | 2 1/8 | 3.40 |
| 3 | 2 7/8 | 4 3/4 | 2 7/8 | 6.30 |
| 4 | 3 5/16 | 6 | 3 7/8 | 10.50 |
| 5 | 3 11/16 | 7 3/8 | 4 13/16 | 14.25 |
| 6 | 4 1/8 | 9 5/16 | 5 3/4 | 28.00 |
Materials Chemical Compositions
ASTM A403 Stainless Steel Pipe Fittings refers to the material of forged and rolled austenitic stainless fittings for pressure pipes. Common grades are WP304/L, WP316/L. They can be used into many fields as engineering industry, energy conversion plants etc.
| Grade A | Composition (%) | |||||||||
| Grade WP | UNS Designation | C | Mn | P | S | Si | Ni | Cr | Mo | Ti |
| WP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-11.0 | 18.0-22.0 | ﹍ | ﹍ |
| WP304L | S30403 | 0.030E | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-12.0 | 18.0-22.0 | ﹍ | ﹍ |
| WP310S | S31008 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 19.0-22.0 | 24.0-26.0 | ﹍ | ﹍ |
| WP316 | S31600 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | |
| WP316L | S31603 | 0.030E | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | ﹍ |
| Wp321 | S32100 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 9.0-12.0 | 17.0-19.0 | ﹍ | G |
Note:
Where a ellipsis(﹍)appears in the table, there is no requirement and the element need to be analyzed for or reported
The method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer
Columbium 0.10-0.30%; Vanadium 0.10-0.30%.
For small diameter or thin walls, or both, where many drawing passes are required, a carbon maximum of 0.04% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.500in.(23.7mm) in outside diameter and light wall tubes as those less than 0.049in.(1.24mm) in average wall thickness
