Cameron U BOP blowout preventer

The Cameron U BOP blowout preventer is the most widely used ram-type BOP for land, platform and subsea applications worldwide. Like all other Cameron preventers, the rams in the U BOP are pressure-energized. Well bore pressure acts on the rams to increase the sealing force and main tain 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: Bonnet seal carrier is available to eliminate the need for high makeup torque on bonnet bolts and nuts. The new 13-5/8” bodies have a bore seal. Therefore you can add the seal carrier without additional re-work. All other sizes require modification to accept the seal carrier. Manual or Hydraulic operating systems available. 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 pres sure is applied to open the BOP. For subsea applications, a pressure balance chamber is used with the wedgelocks to eliminate the possibility of the wedgelock becoming unlocked due to hydrostatic pressure. Retrofit to UM Bonnet is available to provide more shearing force without the need for shear bonnets, large bore bonnets, or tandem boosters. Other features include hydraulically opening bonnets, forged body and a wide selection of rams to meet all applications. See page 46-50 for rams available to fit the U BOP.

The U blowout preventer is designed so that hydraulic pressure opens and closes the rams and provides the means for quick ram change-out. Ram closing pressure closes the rams. When the bonnet bolts are removed, closing pressure opens the bonnet. After the bonnet has moved to the fully extended position, the ram is clear of the body. An eyebolt can be installed in the top of each ram to lift it out of the preventer Ram open ing pressure opens the rams. Following ram change-out, this pressure closes the bonnets. The rams are pulled outward, near the bonnets, before the bonnets begin moving toward the preventer body. This assures that the rams never obstruct the bore or interfere with the pipe in the hole. Hydraulic pressure draws the bonnets tightly against the preventer body and the bonnet bolts are reinstalled to hold the bonnets closed.