Seamless and Welded Stainless Steel Low Pressure Feed Water Heater(FWH) U-bent Tubes 
Seamless Carbon Steel High Pressure Feed Water Heater(FWH) U-bent Tubes 

*Material Grade: 
Stainless steel: 304/304L/304H(1.4301/1.4306/1.4948); 316/316L(1.4401/1.4404); 316Ti(1.4571); 321(1.4541); 309S(1.4833); 310S(1.4845); 317L(1.4438); 321H(1.4878); 347H(1.4550); 2205(1.4462); S31803, 2507 
Carbon steel: Gr. B2, C2 

* Standards: ASTM/ASME A/SA688/213 ASTM/ASME A/SA556 EN 10216-5; DIN 17456; DIN 17458 
GB/T14975; T14976; T13296; GB5310; ASTM A213; A269; A312; A511; A789; A790; JIS G3459; G3463; GOST 9940; GOST 9941; 

*Specification: 
Stainless steel OD 12.7-25.4 mm (1/2- 1 in. ), WT 0.7-3.05 mm (. 028-0.12In. ) 
Carbon steel OD 15.88-25.4mm (5/8- 1 in. ), WT 1.24-3.05 mm (0.049-0.12in. )) 

*Length(Max): 32m (105') 

*Process: Cold drawn, cold rolled (cold pilgered), precision rolled 
, 
*Finish: Annealed & pickling, bright annealing, polished etc 

*Ends: Beveled or plain end, square cut, burr free 

*Payment term: T/T or L/C 


U bending is done by cold working process. 
U bending is done to the required radius as per customer drawings. 
The bend portion and six inch leg is stress relieved by resistance heating. 
Bending radius: Maximum 1000 mm Heat treatment of the bend 
U-bends with a bending radius up to maximum of 1000mm can be heat treated on request 
The basic Testing and processing: 
1. High Pressure Hydrostatic Test: Minimum: 10 Mpa-25Mpa. 
2. Air Under Water Test After Bending 
3. U Tubes Wall Thickness Test 
4. Eddy Current Test before U bend Formed 
5. Ultrasonic Test before U bend Formed 
6. Heat treatment to stress relieved 
7. Ball passing test