Line Stop & Hot Tap Fittings

Custom Fittings for the Pipeline & Oilfield Industries

Intervention Products

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Custom Fittings for the
Pipeline & Oilfield Industries

Enerteq's Line Stop Fittings and Hot Tap Tees use Weldfit’s Surelock Flanges and are completely compatible with all standards in the industry.


Manufactured in Houston, Texas in an ISO 9001:2008 certified facility.  All fittings are compliant with most pipeline design codes.


All pressure-containing welds are radiographed.


The advantages of using extruded outlet fittings include a design reinforcement in the nozzle and elimination of the weld between the header and the branch, which is difficult to radiograph and more expensive.


Sureloc Locking Ring System

The Sureloc Locking Ring System allows carrying out pipeline interventions under pressure, such as installing scarfed nipples, guide bar plugs and line stops.


Line Stop Fittings are used when the removal of the tapping valve is desirable after the completion of a temporary line stop operation.



  • Sureloc Flange and Blind Plug allow for retrieval of hot tapping valve upon completion of line stop procedure.
  • Sureloc Flow-Through (Guide Bar) Plug is available when flow through the outlet is required and the header is subject to future pigging
  • Fittings can be supplied to meet ASME B31.3, B31.4, B31.8, or other pipeline design codes.
  • Standard fittings available for 4” through 48” pipe sizes with ASME Class 150, 300, and 600 flanges
  • Larger fittings and higher pressure class flanges are available upon request
  • Back-up strips available
  • All pressure containing welds are 100% radiographically inspected
  • Compatible with industry standard hot tap and line stop equipment and procedures
  • Manufactured in compliance with WeldFit’s ISO 9001:2008 certified quality program

Custom Fittings for the
Pipeline & Oilfield Industries

Sureloc Flange with
Sureloc Scarfed Nipple Plug

Sureloc Flange with
Sureloc Flow-Through Plug


Hot Tap Tees

Hot Tap Tees are designed and manufactured to ensure Pipe System Integrity. Our full-encirclement fittings feature extruded outlets for branch sizes up to 36” NPS and fabricated branches for larger sizes.


Our Hot Tap Tees have been used successfully in thousands of hot tapping operations around the world. Consisting of a full-encirclement fitting and a weld-neck flange.



  • Full branch or reduced branch fittings for use in hot tapping operations
  • Supplied with ASME Class 150, 300, 600 flanges with raised face or RTJ grooves
  • Other flange classes available on request
  • Tee available with a butt weld outlet, ready to be welded to a valve or other fitting
  • Standard fittings meet the requirements of ASME B31.3 and ASME B31.4/B31.8 with a 0.72 design factor
  • Fittings with outlets through 36” NPS utilize extruded outlets, which allows for 100% radiographic examination and eliminates the stress risers inherent in welded type tees
  • Compatible with all major models of hot tapping equipment
  • All pressure containing welds are 100% radiographed
  • Back-up strips available
  • Manufactured in compliance with WeldFit’s ISO 9001:2008 certified quality program

Full-Encirclement Fitting
and Weld-Neck Flange






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