Torq N’ Seal® Plug Selection Process

  • Size selection – Measure tube ID into the clean rolled portion of the tube
    Avoid the tube to tubesheet circumferential weld that might be necked down into the tube ID measuring smaller than the actual tube. Refer to installation instructions and size selection chart.
  • Alloy Selection –Try to match the alloy of the tube to ensure
    Matching coefficient of thermal expansion
    Elimination of galvanic reaction from dissimilar metals
  • Torque — Apply torque per instructions, however, TNS Plugs are designed to be torqued at least 50% higher —
    The result will be that the serration sealing area will cut deeper into the tube ID
    and tube wall and provide a more positive mechanical contact seal.


Conditions to Avoid / Consider for High Confidence Installation


  • Out of round or eccentric tube ID by more than 0.005”
  • Deep pitting, corrosion, deep axial striations, or cracked tube in the sealing area
  • Locating serrated sealing area on a roll joint, could present a possible leak path
  • Avoid incorrect sizing – Select TNS Plug to be no more than 0.010” less than tube ID
  • Ensure correct torque is applied to TNS Plug during installation

Use our Plug Selector to find the right solution for your leaking heat exchangers and place a request for quote.

Click Here for Plug Selector
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