CAMERON U BOP
Like all other Cameron preventers, the rams in the U BOP are pressure-energized. Wellbore pressure acts on the rams to increase the sealing force and maintain the seal in case of hydraulic pressure loss.
Seal integrity is actually improved by increased well bore pressure.
Other features of the U BOP include:
- Hydraulic stud tensioning available on larger sizes to ensure that stud loading is consistently accurate and even.
- Bonnet seal carrier is available to eliminate the need for high makeup torque on bonnet studs and nuts.
- Hydraulically operated locking mechanisms, wedgelocks, lock the ram hydraulically and hold the rams mechanically closed even when actuating pressure is released. The operating system can be interlocked using sequence caps to ensure that the wedgelock is retracted before pressure is applied to open the BOP.
- For subsea applications, a pressure balance chamber is used with the wedge locks to eliminate the possibility of the wedgelock becoming unlocked due to hydrostatic pressure.
- Other features include hydraulically opening bonnets, forged body and a wide selection of rams to meet all applications.
- Cameron pipe rams are self-feeding and incorporate a large reservoir of packer rubber to ensure a long-lasting seal under all conditions.
- Ram packers lock into place and are not dislodged by well flow
- All Cameron pipe rams are suitable for H2S service per NACE MR-01-75.
- CAMRAM™ top seals are standard for all Cameron pipe rams (except U BOPs larger than 13 3/4″)
- CAMRAM 350™ packers and top seals are available for high temperature service and for service in which concentrations of H2S are expected.
VARIABLE BORE RAMS
- One set of Cameron variable bore rams (VBRs) seals on several sizes of pipe or hexagonal kelly, eliminating the need for a set of pipe rams for each pipe size. Features include: VBR packer contains steel reinforcing inserts which rotate inward when the rams are closed so the steel provides support for the rubber which seals against the pipe.
- All VBRs are suitable for H2S service per NACE MR-01-75.
- CAMRAM™ top seals are standard for all Cameron VBRs.
SHEARING BLIND RAM
- Large frontal area on the blade face seal reduces pressure on the rubber and increases service life.
- Cameron SBRs can cut pipe numerous times without damage to the cutting edge.
- The single-piece body incorporates an integrated cutting edge.
- CAMRAM™ top seals are standard for all Cameron SBRs.
- H2S SBRs are available for critical service applications and include a blade material of hardened high alloy suitable for H2S service.
- DVS (double V shear) rams fold the lower portion of the tubular over after shearing so that the lower blade can seal against the blade packer
- DVS rams include the largest blade width available to fit within existing ram bores.