Low Fin Tubes

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Low Fin Tubes

Pantani Divisione Tubi is specialized in LOW FIN tubes for heat exchangers applied mostly in LNG plants, Chemical & Petrochemical plants, Refineries, Power plants, Renewable energy plants, Naval & Marine plants. Low fins are obtained integrally from tube wall thickness by a cold forming process on the external surface. Fins increase considerably the thermo-exchanging efficiency of the tube.

  • Copper alloys
  • Carbon steel
  • Low alloy steel
  • Stainless steel (austenitic, ferritic, super austenitic)
  • Duplex alloys (UNS S32750, UNS S32760)
  • Titanium
  • Monel alloys
  • Nickel alloys

Low fin dimension capability

Tube OD Tube thickness (plain section) Fin pitch Fin height Tube length
Min. 12,7mm / Max. 31,75mm Min. 1,245mm / Max. 3,404mm 19 – 26 – 27 – 28 – 30 – 36 fins per inch Max. 1,40mm Max. 25000mm

Dimensional controls on low fin tube


– Tube OD plain section (D)
– Tube ID plain section (Di)
– Tube wall thickness plain section (W)
– Tube OD fin section (di)
– Fin root diameter (dr)
– Tube ID fin section (di)
– Thickness under fin (Wf)
– Fin pitch (Fm)
– Fin height (Fh)
– Complete visual check


Standards usually required for low fin tubes:
– ASTM B359/359M (Copper alloys)
– ASTM A498/498M (Carbon steel)
– ASTM A1012/1012M (Stainless steel)
– ASTM B891/891M (Titanium)

Post Finning NDT Control

– Hydrostatic Test
– Prova Pneumatica ad immersione
– Eddy Current Test