Variance From Surface Installations

The arrangements of subsea blowout preventer stacks are similar to the example preventer surface installations with certain differences. The differences are:

  1. Choke and kill lines normally are connected to ram preventer body outlets.
  2. Spools may be used to space preventers for shearing tubulars, hanging off drill pipe, or stripping operations.
  3. Choke and kill lines are manifolded for dual purpose usage.
  4. Blind/shear rams are normally used in place of blind rams.
  5. Ram preventers are usually equipped with an integral or remotely operated locking system.

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