Datos Tecnicos

Ram-Type BOPs U BOP • UII BOP UL BOP • UM BOP

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U BOP
The Cameron U BOP is the most widely used ram-type BOP for land, platform and subsea applications worldwide and offers the widest range of sizes of any Cameron ram-type BOP. Like all other Cameron preventers, the rams in the U BOP are pressureenergized. Wellbore pressure acts on the rams to increase the sealing force andmaintain 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 studs and nuts. • Hydraulically operated locking mechanisms, wedgelocks, lock the ram hydraulically and hold the rams mechanically closed even whenactuating 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 wedgelocks to eliminate the possibility of the wedgelock becoming unlocked due to hydrostatic pressure. Other features include hydraulically openingbonnets, forged body and a wide selection of rams to meet all applications. See pages 11 through 17 for rams available to fit the U BOP.

SD-3772

Wedgelock Assembly

SD-5308

U Blowout Preventer

4

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U BOP Hydraulic Control System
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 opening pressure opens the rams. Following ram change-out, this pressure closes the bonnets. The rams are pulledoutward, 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.

U Blowout Preventer Hydraulic Control System

SD-84-05

Ram Open, Bonnet ClosedRam Closed, Bonnet Open

U BOP Operating Data and Fluid Requirements
Bore Size and Working Pressure 7-1/16" All WP 11" Except 15,000 psi 11" 15,000 psi 13-5/8" Except 15,000 psi 13-5/8" 15,000 psi Model B 16-3/4" 3000 psi Model B 16-3/4" 5000 psi Model B 16-3.4" 10,000 psi 18-3/4" 10,000 psi 20-3/4" 3000 psi 21-1/4" 2000 psi 21-1/4" 5000 psi 21-1/4" 10,000 psi 26-3/4" 3000 psi Gals to Open Galsto Close Locking Closing Opening Pipe Rams Pipe Rams Screw Turns Ratio Ratio (1 Set) (1 Set) (Each End) 1.3 3.4 5.7 5.5 10.4 9.8 9.8 11.6 21.3 8.1 9.0 27.3 24.5 10.1 1.3 3.5 5.8 5.8 10.6 10.6 10.6 12.5 23.1 8.7 8.7 30.0 26.9 10.8 18 27 32 32 45 38 38 45 54 46 46 54 51 58 6.9:1 7.3:1 9.8:1 7.0:1 10.6:1 6.8:1 6.8:1 6.8:1 7.4:1 7.0:1 7.0:1 7.2:1 7.2:1 7.0:1 2.2:1 2.5:1 2.2:1 2.3:1 3.6:1 2.3:1 2.3:12.3:1 3.7:1 1.3:1 1.3:1 4.0:1 4.0:1 1.0:1

Large Bore Shear Bonnet Operating Data and Fluid Requirements
Bore Size and Working Pressure 7-1/16" All WP 11" Except 15,000 psi 11" 15,000 psi 13-5/8" Except 15,000 psi 13-5/8" 15,000 psi Model B 16-3/4" 3000 psi Model B 16-3/4" 5000 psi Model B 16-3.4" 10,000 psi 18-3/4" 10,000 psi 20-3/4" 3000 psi 21-1/4" 2000 psi 21-1/4" 5000 psi 21-1/4" 10,000 psi26-3/4" 3000 psi Gals to Open Gals to Close Locking Closing Opening Pipe Rams Pipe Rams Screw Turns Ratio Ratio (1 Set) (1 Set) (Each End) __ __ __ __ __ 6.8 8.9 10.5 16.0 18.2 18.2 18.2 __ 14.3 14.3 __ __ __ 6.0 9.0 10.9 16.2 19.0 19.0 19.1 __ 14.9 14.9 __ __ __ 27 32 32 45 38 38 45 __ 46 46 __ __ __ 12.0:1 15.2:1 10.8:1 16.2:1 10.4:1 10.4:1 10.4:1 __ 10.8:1 10.8:1 __ __ __ 4.8:1 3.7:1 4.5:1...