Induction Bending is a controlled means of bending pipes through the application of local heating using high frequency induced electrical power.

Originally used for the purpose of surface hardening steels, induction technology when used in pipe bending consists basically of an induction coil placed around the pipe to be bent. The induction coil heats a narrow, circumferential section of the pipe to a temperature of between 850 and 1100 degrees Celsius (dependant on the material to be formed). As the correct bending temperature range is reached, the pipe is moved slowly through the induction coil whilst the bending force is applied by a fixed radius arm arrangement.

As the bending occurs, the adjacent area forward of the heat band is water or air quenched (or may be allowed to cool naturally) thereby allowing the cool material to either side of the ‘heat band’ to retain the integrity of the original material as best as possible. This means of distortion control provides excellent dimensional accuracy and repeatability.

Achieved tolerances when forming induction bends are to some extent governed by the materials in hand and the required format of the finished product.

Although induction bending produces excellent results as far as physical properties are concerned, it must be noted that there are two important considerations required – firstly the reduction in wall thickness at the outside (extrados) of the bend and secondly the degree of ovality which is present.

The induction pipe bending process uses induction heating to produce highly accurate bends. The quality of induction bends is superior to the elbow fitting. Hydro burst tests show that spools with induction bends fail in the straight pipe and not in the bend, whereas in comparable elbow-based systems the elbow (inside radius) is always the first to burst. Stress calculations confirm this. The natural tendency to have a thicker inside wall thus proves to be advantageous and ensures that the bend exceeds the strength of the straight pipe.

Hot Induction Bends, Long Radius Piggable Bends, Induction Pipe Bending Bends Long Radius Carbon Steel Bends, Long Radius High Yield Carbon Steel Bends Long Radius Bends R-2D, R-3D, R-5D, R-6D, R-8D upto 22D Long Radius Piggable Bends R-2D, R-3D, R-5D, R-6D, R-8D upto 22D 

Hot Induction Long Radius Bends R-2D, R-3D, R-5D, R-6D, R-8D upto 22D API-5L Hot Induction Long Radius Bends R-2D, R-3D, R-5D, R-6D, R-8D upto 22D Induction Pipe Bending Bends 2D, 3D, 5D, 6D, 8D upto 22D Induction Long Radius Pipe Bending Bends API 5L X42, X46, X52, X56, X60, X65, X70 Induction Long Radius Pipe Bending Bends API5LX-42, X-46, X-52, X-56, X-60, X-65, X-70 Long Radius Bends 30 Deg., 45 Deg., 60 Deg., 90 Deg., 180 Deg., 360 Deg. upto 60" Diameter Long Radius Bends in API 5L X42, API 5L X46, API 5L X52, API 5L X56, API 5L Grade B Long Radius Bends in API 5L X60, API 5L X65, API 5L X70, API 5L Grade-B Long Radius Bends in API 5L X-42, API 5L X-46, API 5L X-52, API 5L X-56, API 5L Grade B Long Radius Bends in API 5L X-60, API 5L X-65, API 5L X-70, API 5L Grade-B SA-234 WPB, WPC, WP1, WP5, WP7, WP9, WP11CL7, WP12CL1, WP22, WP91 ASTM A-860 WPHY-42, WPHY-46, WPHY-52, WPHY-56, WPHY-60, WPHY-65, WPHY-70 ASTM A-860 WPHY42, WPHY46, WPHY52, WPHY56, WPHY60, WPHY65, WPHY70 MSS SP75 WPHY 42, WPHY 46, WPHY 52, WPHY 56, WPHY 60, WPHY 65, WPHY 70 MSS SP75 WPHY42, WPHY46, WPHY52, WPHY56, WPHY60, WPHY65, WPHY70 MSS-SP-75 WPHY42, WPHY46, WPHY52, WPHY56, WHPY60, WHPY65, WPHY70 MSS-SP-75 WPHY 42, WPHY 46, WPHY 52, WPHY 56, WHPY 60, WHPY 65, WPHY 70 MSS-SP-75 WPHY-42, WPHY-46, WPHY-52, WPHY-56, WHPY-60, WHPY-65, WPHY-70 MSS SP75 WPHY42, WPHY46, WPHY52, WPHY56, WHPY60, WHPY65, WPHY70 MSS SP75 WPHY 42, WPHY 46, WPHY 52, WPHY 56, WHPY 60, WHPY 65, WPHY 70 MSSSP75 WPHY-42, WPHY-46, WPHY-52, WPHY-56, WHPY-60, WHPY-65, WPHY-70 ASTM A-234 WPB, ASTM A234 WPC, ASTM A234 WPB Seamless, ASTM A234 WPC Seamless ASTM A-234 WP1, WP11 CL1, WP11 CL3, WP12 CL1, WP22 CL1, WP22 CL3 ASTM A-234 WP5 CL1, WP5 CL3, WP9 CL1, WP9 CL3, WP91 ASTM A-403 WP304, 304L, 304H, 310S, 316, 316L, 316H, 321, 321H, 347, 347H, 317, 317L ASTM A-420 WPL3, WPL6, WPL8, WPL9 ASTM A-182 F304, F304L, F304H, F310S, F316, F316L, F316H, F321, F321H, F347, F347H, F348 ASTM A-182 F1, F11, F12, F22, F5, F9, F91, F92 ASTM A-182 F-1, F-11, F-12, F-22, F-5, F-9, F-91, F-92 ASTM A-694 F-42, ASTM A694 F-46, ASTM A694 F-52, ASTM A694 F-56 ASTM A-694 F-60, ASTM A694 F-65, ASTM A694 F-70, ASTM A694 F-80 SAE / AISI Grade 1008, 1010, 1018, 1020, 1025, 1026, 1040, 1045, 1050, 4130, 4140, 4150, 4340 

AISI-4130 L-80 according to API-5CT, 75KSI according to API-6A Quenched / Hardened & Tempered SAE-4130 L-80 according to API-5CT, 75KSI according to API-6A Quenched / Hardened & Tempered AISI-4140 L-80, P-110 according to API-5CT, API6A, NACE MR-01-75 Quenched / Hardened & Tempered SAE-4140 L-80, P-110 according to API-5CT, API6A, NACE MR-01-75 Quenched / Hardened & Tempered Duplex 2205, Duplex SAF 2205, Duplex SAF2205, Duplex UNS S31803, Din 1.4462 EN 10088 F51 Duplex ASTM A182 Grade F60 / ASME SA182 Grade F60 NACE & Norsok Approved Duplex SAF2205 SANMAC, URANUS 45N, PREN=33, PREN=34, PREN=35, PREN=36 DIN 1.4462 Duplex-2205 UNS S31803 / UNS S32205 DIN-1.4462 EN 10088-3 PREN = 33, PREN = 34, PREN = 35Super Duplex 2507, Super Duplex SAF 2507, Super Duplex SAF-2507, Super Duplex UNS S32750 F53Super Duplex SAF 2507 UNS S32750 DIN 1.4410 EN-10088 URANUS 47N(+) PREN=41 Minimum Super Duplex UNS S32760 F-55 ASTM A182 F55 SA182 F-55 DIN 1.4501 UNS 32760 F55

Inspection & Approval Certificates : EN10204 3.1 / DIN 50049 3.1 / ISO 10474 3.1 Mill Test Certificate, NACE MR-0175 / ISO 15156, NACE MR-01-03 / NACE MR-01-75 / ISO 15156, CE Marked, European Pressure Equipment Directive PED-97/23/EC, AD-2000-W0, ASME Boiler & Pressure Vessel Code Sec.II Part A Ed. 2008, with 3.2 certificate duly Certified & Approved by LRS (Lloyd's Register), GL (Germanischer Lloyd), BV (Bureau Veritas), DNV (Det Norske Veritas), ABS (American Bureau of Shipping), SGS, TUV, RINA, IRS, NORSOK Approved Standard M-630, M-650 Rev.3

ANSI/ASME B16.49-2001  Factory-Made Wrought Steel Buttwelding Induction Bends for Transportation and Distribution Systems

MSS SP-75 Specification for High-Test,Wrought,Butt-Welding Fittings   EN 14870-1 Petroleum and natural gas industries. Induction bends, fittings and flanges for pipeline transportation systems-Part 1: Induction Bends

ISO 15590-1:2004, Petroleum and natural gas industries. Induction bends, fittings and flanges for pipeline transportation systems. Part 1. Induction bends

Total GS EP PLR 221  Fabrication of hot bends for pipelines (sweet service)

Nominal Pipe

Outside diameter

BENDING RADIUS(mm) Angle Bending

Tangent Length at

Wall Thickness 3D 4D 5D 6D 8D 10D

Size in O.D. θ Each end (mm)3" 89 267 356 445 534 712 890 90°,60° 

45°,30° 22.5°,or as per 

the choice 

of purchaser

350 Sch STD,sch10,Sch20, Sch30,Sch40, 

Sch80,etc. or as per the choice

of purchaser

4" 114 342 456 570 684 912 1140 3506" 168 504 672 840 1008 1344 1680 3508" 219 657 876 1095 1314 1752 2190 70010" 273 819 1092 1365 1638 2184 2730 70012" 325 975 1300 1625 1950 2600 3250 70014" 356 1068 1424 1780 2136 2848 3560 70016" 406 1218 1624 2030 2436 3248 4060 70018" 457 1371 1828 2285 2742 3656 4570 100020" 508 1524 2032 2540 3048 4064 5080 100022" 559 1677 2236 2795 3354 4472 5590 100024" 610 1830 2440 3050 3660 4880 6100 100026" 660 1980 2640 3300 3960 5280 6600 1D

(Outsidediameter

of bend)or as per 

the choice 

of purchaser

28" 711 2133 2844 3555 4266 5688 711030" 762 2286 3048 3810 4572 6096 762032" 813 2439 3252 4065 4878 6504 813034" 864 2592 3456 4320 5184 6912 864036" 914 2742 3656 4570 5484 7312 914038" 965 2895 3860 4825 5790 7720 965040" 1016 3048 4064 5080 6096 8128 1016042" 1067 3201 4268 5335 6402 8536 1067044" 1118 3354 4472 5590 6708 8944 1118046" 1168 3504 4672 5840 7008 9344 1168048" 1219 3657 4876 6095 7314 9752 1219050" 1270 3810 5080 6350 7620 10160 1270052" 1321 3963 5284 6605 7926 10568 1321054" 1372 4116 5488 6860 8232 10976 13720

56" 1422 4266 5688 7110 8532 11376 14220

Bend end preparation:Welding ends to be beveled as per ASME B16.25 or as per specified by purchaser. Induction Pipe Bending Standard Bend Tolerances Bend Angle:±1/2° Bend Radius:±1% Bend Plane:±1° End squareness Size NPS36" and smaller:2.4mm(0.09") Size Greater than NPS36":3.0mm(0.12") Linear Dimensions Size Nps24" and smaller:±5mm(0.19") Size Greater than NPS 24":±6mm(0.25") Thinning: <0.10% of the bend nominal wall thickness or ≤50D/R(%)(R=bend centerline radius, D=nominal outside diameter of starter stock) or ≤0.05% of the nominal wall thickness of the matching pipe.