Field Service Guide



  1. Care should be taken not to damage connections during drifting operations.
  2. Drifting should be done prior to cleaning or inspecting.
  3. Blow out the pipe ID (from box to pin) to completely remove loose mill scale and accumulated debris.
  4. Ensure drift mandrels conform to API dimensional requirements (Reference API Specification 5CT, Table E.31) or specified special drift requirements.
  5. Drift from box to pin.
  6. Tubulars that will not pass the drift test should be marked with a red paint band (on either side where drift is sticking) and laid aside for further investigation. “No drift” should be marked on pipe to avoid confusion with other types of damage.
  7. Connections should be thoroughly cleaned and inspected after drifting.


  1. Clean connections using one of the following methods (diesel is difficult to remove from the threads and is not recommended as a cleaning solvent):
    1. A nonmetallic brush and cleaning solvent.
    2. Steam clean with water and cleaning solvent.
    3. A rotary bristle brush with jetted water and cleaning solvents.
    4. High pressure water blast.
  2. Wipe or blow out solvents from thread roots and from the bottom of the box. During freezing weather, care must be taken to ensure that no moisture remains on the connection. Ice may prevent proper seal and shoulder engagement during make-up.


  1. Maximum benefit can be obtained from your tubulars by employing a Hydril Field Service Representative for your visual inspection operations.
  2. Only Hydril plants and Authorized Repair Facilities produce genuine Hydril connections. These genuine threads can be identified by a low stress roller mark on the pin and box.
  3. Connections should be situated so that the joints may be rolled to facilitate complete cleaning and inspection.
  4. Inspect all thread and seal areas for damage. Reference the General Visual and Inspection Guidelines, Tech Note 0603.
  5. Those connections found unserviceable should be referred to a Hydril representative for field repair or set aside.

Doping / Connection Preparation

  1. Handle all tubulars with thread protectors in place.
  2. API-Modified or the compound manufacturer’s non-lead substitute for API-Modified is recommended. Compounds that contain solid fillers are required for use on Wedge Thread™ connections.
  3. A thermal grade running compound is recommended when the service temperature exceeds 250° F/120°C.
  4. An arctic grade running compound is recommended during freezing weather. The compound should be kept free of contamination by water and ice particles.
  5. A water-displacing, corrosion-inhibiting compound should be used for long-term storage of connections.
    1. Pipe in storage should be inspected periodically and storage compound should be applied when necessary to arrest corrosion.
    2. When pipe arrives on location, storage compound should be wiped from the pin and box and running compound should be applied to the pin (thread form outline will be clearly visible).
  6. Apply a thin, even coat of running compound (thread form outline will be clearly visible) to the entire pin thread and seal areas using a mustache brush. Do not dope box.
  7. When it is necessary to use a thread-locking compound, such as on float equipment, use one of the following applicable methods:
    1. For two-step connections, such as SLX, apply the thread locking compound to the large step of the pin thread only and apply running compound on small step of the pin and metal seal area at the back of the box. Avoid applying thread-locking compound on any metal seal area.
    2. For Wedge connections, apply thread-locking compound to top half of pin thread only (approximately 3 to 4 threads). If the Wedge product has a metal seal, apply running compound to the metal seal area at the back of the box.
  8. For connection sizes 10-3/4" and larger, horizontal make-up of assemblies are not recommended on parts heavier than a coupling unless they are made-up with either a thread-locking compound or re-tonged in the vertical position on the rig before running into the hole. When making-up connections in a horizontal position, special care should be given to proper alignment. Even small errors can cause binding which may prevent sufficient torque from reaching the connection.
  9. Re-apply clean thread protectors.