Expansion Loop Sizing: carbon steel
cs 4 lbend dt200 to cs 8 lbend dt200
Pipe thermal expansion loop sizing — U-bend loop width, height, and offset leg dimensions by pipe material, NPS, and temperature differential. Based on Engineering ToolBox formula W=0.015*(dl_mm*OD_mm)^0.5 per ASME B31.3 Appendix D flexibility principles and Kellogg/Spielvogel methods. Covers carbon steel (NPS 2–12, dT 100–300°F), stainless steel 304/316 (NPS 2–8, dT 100–300°F), and copper (NPS 2–4, dT 50–100°F). Also includes L-bend offset leg records for carbon steel. Thermal expansion per ASME B31.3 Appendix C.
| pipe material | record id | anchor force multiplier (dimensionless) | cte in per 100ft per deltaT (in/100ft/F) | guide spacing from loop ft (ft) | loop height ft (ft) | loop width ft (ft) | nps in (in) | od in (in) | od mm (mm) | offset leg ft (ft) | standard | temp delta C (delta_C) | temp delta F (delta_F) | thermal expansion in per 100ft (in/100ft) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| carbon steel | cs 4 lbend dt200 | — | 0.00078 | 16 | — | — | 4 | 4.5 | 114.3 | 26.5 | ASME B31.3 Appendix D; Engineering ToolBox; Engineers Edge Expansion Loop Calculator | 111.1 | 200 | 1.56 |
| carbon steel | cs 6 dt100 | 1 | 0.00078 | 18 | 11.7 | 5.9 | 6 | 6.625 | 168.3 | 29.3 | ASME B31.3 Appendix C; Engineering ToolBox Expansion Loops; M. W. Kellogg Design of Piping Systems 2nd Ed | 55.6 | 100 | 0.78 |
| carbon steel | cs 6 dt200 | 1 | 0.00078 | 25 | 16.6 | 8.3 | 6 | 6.625 | 168.3 | 41.5 | ASME B31.3 Appendix C; Engineering ToolBox Expansion Loops; M. W. Kellogg Design of Piping Systems 2nd Ed | 111.1 | 200 | 1.56 |
| carbon steel | cs 6 dt300 | 1 | 0.00078 | 30 | 20.3 | 10.2 | 6 | 6.625 | 168.3 | 50.8 | ASME B31.3 Appendix C; Engineering ToolBox Expansion Loops; M. W. Kellogg Design of Piping Systems 2nd Ed | 166.7 | 300 | 2.34 |
| carbon steel | cs 6 lbend dt200 | — | 0.00078 | 19 | — | — | 6 | 6.625 | 168.3 | 32.2 | ASME B31.3 Appendix D; Engineering ToolBox; Engineers Edge Expansion Loop Calculator | 111.1 | 200 | 1.56 |
| carbon steel | cs 8 dt100 | 1 | 0.00078 | 20 | 13.4 | 6.7 | 8 | 8.625 | 219.1 | 33.5 | ASME B31.3 Appendix C; Engineering ToolBox Expansion Loops; M. W. Kellogg Design of Piping Systems 2nd Ed | 55.6 | 100 | 0.78 |
| carbon steel | cs 8 dt200 | 1 | 0.00078 | 28 | 19 | 9.5 | 8 | 8.625 | 219.1 | 47.4 | ASME B31.3 Appendix C; Engineering ToolBox Expansion Loops; M. W. Kellogg Design of Piping Systems 2nd Ed | 111.1 | 200 | 1.56 |
| carbon steel | cs 8 dt300 | 1 | 0.00078 | 35 | 23.2 | 11.6 | 8 | 8.625 | 219.1 | 58.1 | ASME B31.3 Appendix C; Engineering ToolBox Expansion Loops; M. W. Kellogg Design of Piping Systems 2nd Ed | 166.7 | 300 | 2.34 |
| carbon steel | cs 8 lbend dt200 | — | 0.00078 | 22 | — | — | 8 | 8.625 | 219.1 | 36.7 | ASME B31.3 Appendix D; Engineering ToolBox; Engineers Edge Expansion Loop Calculator | 111.1 | 200 | 1.56 |
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