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U

Surface ram-type BOP

The U BOP is the most widely used ram-type BOP in the world and has our widest bore-size range.

The U BOP is designed to maximize reliability and performance while simplifying maintenance.

Hydraulic stud tensioning is available on larger sizes to ensure that stud loading is consistently accurate and even.
Bonnet seal carriers eliminate the need for high makeup torque on bonnet studs and nuts.
Wedge locks can be interlocked with the BOP operating system using sequence caps to ensure the wedge lock is retracted before applying pressure to open the BOP.
Other features include hydraulically opening bonnets, a forged body, and a wide selection of rams to meet a variety of applications.

Specifications
Application	Offshore (surface) and onshore
Bore sizes and working pressures	7 1/16, 11, and 13 5/8 in: 3,000 to 15,000 psi 16 3/4 in: 3,000 to 10,000 psi 20 3/4 in: 3,000 psi 21 1/4 in: 2,000, 5000, and 10,000 psi 26 3/4 in: 3,000 psi
Body styles	Single, double, triple, or quad
Rams	Pressure-energized
Lock types	Standard: Manual Optional: Hydraulic
Bonnets	Hydraulically opening
Available bonnets	Large-bore and FXT
Maintenance	Field-replaceable bonnet cylinders, pistons, and seals

Ram-type BOP

High-Temperature Variable-Bore Rams

H2S and high-temperature applications

Provide a seal to a range of diameters, and are suited for H2S service per NACE MR0175 and compatible with U surface ram-type BOP.

Variable-Bore Rams

Variable-bore rams that seal on a wide range of pipe diameters

Enable sealing a standard BOP on several different pipe diameters.

Pipe Rams

Fixed-size sealing of tubulars

Form one-half of a ram cavity's seal with the packer, top seal, and ram body acting in unison.

Bonnet Assembly Options

Designed specifically for our equipment

Employ more closing force with greater certainty in a smaller footprint.

BOP Recertification

OEM recertification

Maximize asset life and protect its integrity.

Land Closing Unit

Onshore BOP control system

Meet API Spec 16D requirements with high quality standards.

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Interview Seth Berry

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Tech Report Nonshearables Eliminated by 13 5/8-in 10,000-psi Shear and Seal Ram

New DSI dual-string interlocking shear rams enable greater performance in U and UM BOPs.

Product Sheet U Onshore ram-type BOP

Most widely used ram-type BOP for land, platform, and subsea applications worldwide.

Video U Ram-Type BOP