Severe Service Access Fitting Assemblies

Cosasco has developed a line of patented internal corrosion monitoring access fittings. By using an insert made of Hastelloy® C276, the seal seat areas and threads are protected from corrosion damage. Hastelloy® C276 is a strong passive film forming material. Consequently, as a cathode in a galvanic cell, it tends to pass very little current. This tendency and the large anode-to-cathode area ratio eliminates galvanic corrosion.

These internal corrosion monitoring fittings were subjected to rigorous independent testing by a major middle east oil company and their test results proved the merits of this design.


  • Corrosion Resistant Hastelloy® Threads and Seal Seat Areas
  • Vessel Compatible Body Material for Welding Compatibility
  • Especially Ideal for Bottom-Of-Line Positions
  • Design Virtually Eliminates Galvanic Corrosion
  • Available on any Model Access Fitting, any Tee Size
  • Compatible with all Existing Equipment
  • Meets Material Requirements of NACE MR0175 and MR0103


  • Corrosion resistant Hastelloy® threads and seal seat areas
  • Tendency and large anode-to-cathode area ratio eliminates galvanic corrosion
  • Compatible with all existing equipment
  • Meets NACE MR0175 and MR0103


  • Materials are chosen primarily for compatibility with the vessel material on which they are installed
  • Especially common on bottom-of-line installations
  • Subjected to rigorous independent testing


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