Bend tubing:
Tube bending is the umbrella term for metal forming processes used to permanently form pipes or tubing. One must differentiate between form-bound and free form-bending procedures, as well as between heat supported and cold forming procedures.
Processes:
Press bending:
Press bending is probably the first bending process used on cold pipes and tubing
Rotary draw bending:
Full tooling for rotary draw bending
Rotary draw bending (RDB) is a precise technology, since it bends using tooling or “die sets” which have a constant center line radius (CLR), alternatively indicated as mean bending radius (Rm).
Roll bending
During the roll bending process the pipe, extrusion, or solid is passed through a series of rollers (typically three) that apply pressure to the pipe gradu
For Wrought Product (WP) Dimension is covered in
ASME B16.9- which is standard for Factory-made Wrought Butt-welding Fittings for size NPS 1⁄₂ to NPS 48” and
And B16.28- which is standard for Wrought Steel Butt-Welding Short Radius Elbows and Returns for size NPS 1⁄₂ to NPS 24”
| NOMINAL PIPE SIZE | OUTSIDE DIAMETER | BACK TO FACE | CENTER TO CENTER | ||
| Inch. | OD | A | B | C | D |
| 1/2 | 21.3 | 48 | – | 76 | – |
| 3/4 | 26.7 | 43 | – | 57 | – |
| 1 | 33.4 | 56 | 41 | 76 | 51 |
| 1 1/4 | 42.2 | 70 | 52 | 95 | 64 |
| 1 1/2 | 48.3 | 83 | 62 | 114 | 76 |
| 2 | 60.3 | 106 | 81 | 152 | 102 |
| 2 1/2 | 73 | 132 | 100 | 191 | 127 |
| 3 | 88.9 | 159 | 121 | 229 | 152 |
| 3 1/2 | 101.6 | 184 | 140 | 267 | 178 |
| 4 | 114.3 | 210 | 159 | 305 | 203 |
| 5 | 141.3 | 262 | 197 | 381 | 254 |
| 6 | 168.3 | 313 | 237 | 457 | 305 |
| 8 | 219.1 | 414 | 313 | 610 | 406 |
| 10 | 273.1 | 518 | 391 | 762 | 508 |
| 12 | 323.9 | 619 | 467 | 914 | 610 |
| 14 | 355.6 | 711 | 533 | 1067 | 711 |
| 16 | 406.4 | 813 | 610 | 1219 | 813 |
| 18 | 457.2 | 914 | 686 | 1372 | 914 |
| 20 | 508 | 1016 | 762 | 1524 | 1016 |
| 22 | 559 | 1118 | 838 | 1676 | 1118 |
| 24 | 610 | 1219 | 914 | 1829 | 1219 |
Pipe Fittings Dimensions Tolerance as per ASME B16.9
| NOMINAL PIPE SIZE | ALL FITTINGS | ALL FITTINGS | ALL FITTINGS | ELBOWS AND TEES | 180 DEG RETURN BENDS | 180 DEG RETURN BENDS | 180 DEG RETURN BENDS | REDUCERS | CAPS |
| NPS | O.D. at Bevel (1), (2) | I.D. at End (1), (3), (4) |
Wall Thickness (3) | Centre-to-End Dimension A,B,C,M | Centre-to-Centre O | Back-to-Face K | Alignment of Ends U | Overall Length H | Overall Length E |
| ½ to 2½ | 0.06 -0.03 |
0.03 | Not less than 87.5% of nominal thickness | 0.06 | 0.25 | 0.25 | 0.03 | 0.06 | 0.12 |
| 3 to 3 ½ | 0.06 | 0.06 | Not less than 87.5% of nominal thickness | 0.06 | 0.25 | 0.25 | 0.03 | 0.06 | 0.12 |
| 4 | 0.06 | 0.06 | Not less than 87.5% of nominal thickness | 0.06 | 0.25 | 0.25 | 0.03 | 0.06 | 0.12 |
| 5 to 8 | 0.09 -0.06 |
0.06 | Not less than 87.5% of nominal thickness | 0.06 | 0.25 | 0.25 | 0.03 | 0.06 | 0.25 |
| 10 to 18 | 0.16 -0.12 |
0.12 | Not less than 87.5% of nominal thickness | 0.09 | 0.38 | 0.25 | 0.06 | 0.09 | 0.25 |
| 20 to 24 | 0.25 -0.19 |
0.19 | Not less than 87.5% of nominal thickness | 0.09 | 0.38 | 0.25 | 0.06 | 0.09 | 0.25 |
| 26 to 30 | 0.25 -0.19 |
0.19 | Not less than 87.5% of nominal thickness | 0.12 | … | … | … | 0.19 | 0.38 |
| 32 to 48 | 0.25 -0.19 |
0.19 | Not less than 87.5% of nominal thickness | 0.19 | … | … | … | 0.19 | 0.38 |
Nickel Alloy
ASTM / ASME SB 336 UNS 2200 ( NICKEL 200 ), UNS 2201 (NICKEL 201 ), UNS 4400 (MONEL 400 ), UNS 8020 ( ALLOY 20 / 20 CB 3, UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600 ), UNS 6601 ( INCONEL 601 ), UNS 6625 (INCONEL 625), UNS 10276 ( HASTELLOY C 276 )
Stainless Steel
ASTM / ASME SA 403 GR WP “S” / “W” / ” WX” 304 , 304L, 304H, 304N, 304LN, 309, 310H, 316, 316H, 317, 317L, 321, 321H, 347, 347 H.
Duplex Steel
ASTM / ASME SA 815 UNS NO.S 31803, S 32205, S 32550, S 32750, S 32760.
Carbon Steel
ASTM / ASME A 234 WPB, WPC ASTM / ASME A 860 WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70.
Alloy Steel
ASTM / ASME A 234 WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 23, WP 91.
| Chemical Composition Content | Mechanical Properties | ||||||||||
| Material NO | C | Mn | Si | S | P | Cr | Mo | Ni | Tensile strength | Yield strength | Elongation |
| A234 WPB | ≤0.3 | 0.29-1.06 | ≥0.1 | ≤0.058 | ≤0.05 | / | / | / | 415-585 | ≥240 | ≥30 |
| A234 WP5 | ≤0.15 | ≤0.6 | ≤0.5 | ≤0.04 | ≤0.03 | 4-6 | 0.44-0.65 | / | 415-585 | ≥205 | ≥20 |
| A403 WP304 | ≤0.08 | ≤2 | ≤1 | ≤0.040 | ≤0.030 | 18-20 | / | 8-11 | ≥515 | ≥205 | ≥30 |
| A403 WP316L | ≤0.03 | ≤2 | ≤1 | ≤0.045 | ≤0.03 | 16-18 | 2-3 | 10-15 | ≥485 | ≥170 | ≥30 |
| WPHY60 | ≤0.20 | 1-1.45 | 0.15-0.4 | ≤0.015 | ≤0.030 | / | / | / | ≥515 | ≥415 | / |
Light Oiling, Black Painting, PE /3PE Anti-corrosion Coating
Hot induction bend planking requirements
We focus on every procedure to assure quality ,the package we usually take is plank the steel pipe elbows with environmental poly bags,and then in free fumigation wooden cases or wooden plate.we also accept customized package such as OEM by negotiation.
- material shall be packed ready for export in a manner which allows easy handling and prevents damage,vendor shall submit their standard packing procedure to purchaser for approval.
- Open ends of fitting and flanges shall be supplied with heavy duty plastic protective plugs or caps.For beveled ends ,the caps shall protect the full area of the bevel.
- Water proof barrier material shall be used for stainless steel material to protect against chlorine attack by exposure to salt water atmosphere.
- Carbon steel and stainless steel items are not allowed to be stored together and shall be packed separately.
