U BEND TUBES
Valtecno core business is U bend tubes for heat exchangers applied mostly in Oil & Gas plants, Chemical & Petrochemical plants, Refineries, Power plants, Renewable energy plants.
MATERIALS
- Copper alloys
- Carbon steel
- Low alloy steel (T11, T5, T22 etc.)
- Stainless steel (austenitic, ferritic, super austenitic))
- Duplex alloys (UNS S32750, UNS S32760)
- Titanium (Gr.2, Gr.12)
- Monel alloys
- Nickel alloys (Incoloy, Inconel, Hastalloy, etc.)
DIMENSION CAPABILITY
| Tube OD | Tube thickness | Bending Radius | Straight “leg” length | Straight tube before U bending |
|---|---|---|---|---|
| Min. 12,7 mm / Max. 31,75 mm | Min. 0,70 mm / Max. 4,19 mm | Min. 1,5 x OD / Max. 1.250 mm | Max. 12.500 mm | Max. 27.000 mm |
DIMENSIONAL CONTROLS ON U BEND TUBE
- Ovalization of straight and bending portion (A-B-C-D-E-F-G)
- Thinning of straight and bending portion (A-B-C-D-E-F-G)
- Leg spacing length (I.A.1 + I.A.2)
- U bend tube length (leg + radius + (0,5 x OD)
- Difference between legs length
- Straightness of legs
- Deviation from bend plane
- Twist of bending portion
- Squareness and cleanliness of tube ends
- Complete visual check
TOLLERANCE
Standards usually required to establish U bend tube tolerances:
- ASTM A556/556M
- ASTM B395 / B395M
- ASTM A688/688M
- ASTM A803/803M
- TEMA Section 5 § RCB 2.31
- DIN 28179
POST BENDING HEAT TRATMENT BY ELECTRIC RESISTANCE (JOULE EFFECT)
After U bend (cold forming), heat treatment of bending portion may be required. Pantani Divisione Tubi is equipped with 2 heat treatment machines and 1 nitrogen generating machine (to protect stainless steel tube surface during annealing). Temperature is controlled through the entire heat treated area by fixed and portable infrared pyrometers.
POST BENDING NDT CONTROL
- Hydrostatic Test
- Air Underwater Test
- Pulsating Test
- Magnetoscopic test
PACKING
Any type of packing is available according to customer need to worldwide destinations.
REQUEST FORM
Valtecno Alettatura Srl
Via Piana, 50 – 47032 Bertinoro (FC) – Italy
Ph. +39 (0)543 449206
Fax +39 0)543 448102