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 ODTube thicknessBending RadiusStraight “leg” lengthStraight tube before U bending
Min. 12,7 mm / Max. 31,75 mmMin. 0,70 mm / Max. 4,19 mmMin. 1,5 x OD / Max. 1.250 mm
Max. 12.500 mmMax. 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.

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