Casing Spool Installation

  1. Clean the ring grooves on the bottom flange of casing spool and on the base flange, as well as the restricted packing bore of the casing spool.
  2. Oil the secondary packing and the restricted packing bore of the casing spool.
  3. Fill the void area with oil around the primary and secondary packing group.
  4. Place the metal ring joint in its groove.
  5. Align the bolt holes on the casing spool with the bolt holes on the base flange.
  6. Lower the casing spool over the secondary packing assembly (being careful not to roll or tear the secondary packing), until the casing spool comes to rest on the ring gasket. The use of a torque wrench is recommended.
  7. Assemble nuts to bolts and tighten. Wherever possible use a 'hydraulic studs tensioning system'. This system allows tightening of all studs together at once with a reduced make-up time.

Otherwise tighten them conventionally with the correct torque (Refer to 15.3) to ensure a proper seal, tighten the bolts using the following method:

  1. Tighten the first bolt.
  2. Tighten the bolt at 180° from the 1st bolt.
  3. Tighten the bolt 90° from the 1st bolt.
  4. Tighten the bolt 180° from the 3rd bolt.
  5. Continue this alternating procedure until all bolts have been tightened.

Checking the torque of the stud bolts must be done during drilling and after each BOP test due to the vibration and weight that they have to bear.

ENI S.p.A. Agip Division

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