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Academy - CTI - 5 1/8\" 10,000 Spherical BOP

Spherical BOP

Academy Petroleum is excited to offer our new 5 1/8" - 10,000 Spherical BOP in conjunction with Control Technology Inc. Academy Spherical Blowout Preventers are compact annular BOPs designed to seal reliably on almost any size or shape of object in the wellbore (eg. drill pipe, kellys, casing and wirelines). They can also be used to maintain pressure control while stripping pipe into and out of the hole and are well suited for snubbing applications. Academy BOPs are rugged and reliable and are designed to withstand the rigors and harsh oilfield environments from the frigid arctic to the scorching deserts.


  • First 5 1/8" - 10,000 Spherical BOP on the market
  • Designed, Manufactured and Tested in accordance with API Specification 16A
  • Simple, reliable design and construction
  • Only five major components
  • Only two connections needed for Hydraulic System
  • Wear rings are supplied on moving parts to maximize the life of steel components and seals
  • Seal element can be changed without contaminating the hydraulic system
  • Manufactured from high quality steel forgings
  • Compact design, low overall height
  • Rated for Sour H2S Service as defined by API16A & NACE MR-0175
  • Suitable for low temperature applications
  • Full opening 5 1/8" bore

Spherical BOP section

Design principle

When hydraulic fluid is pumped into the closing port it fills the closing chamber below the piston, causing the piston to rise. The rising piston pushes on the seal element which then rides upwards and inwards on the spherical profile of the lid. As the sealing element is squeezed into the well bore, it will contact and seal on any size or shape of object in the well bore. If there is no object in the bore, the sealing element will continue to squeeze shut until it seals of the entire bore.


Physical Data for Academy 5 1/8” - 10,000 Spherical Blowout Preventer
Rated Working Pressure (Well Bore)10,000 PSI (69.0 MPa)Overall Height (Excl. Flange Studs)31.93 inches (811 mm)
Hydraulic System Rated Working Pressure1,500 psi (10.3 MPa)Maximum Outside Diameter31.75 inches (806 mm)
Hydraulic System Recommended Operating Pressure1,500 psi (10.3 MPa)Weight (Dry, Incl. Sealing Element)4,320 lbs (1,960 kg)
Hydraulic Closing Volume5.8 gal (US) (21.9 L)Hydraulic Opening Volume5.0 gal (US) (19.0 L)

Annular BOP Packing Element

Spherical BOP

Academy Petroleum Industries 5 1/8" - 10,000 Annular BOP Packing Element has been designed to our specifications to ensure proper fitment and operation with our 5 1/8" - 10,000 Annular Blow Out Preventer. Our Packing Element is based on a time tested and field proven design used successfully in the oilfield for many decades. The Packing Element is designed, manufactured & tested in accordance with the stringent requirements set forth in API Specification 16A.

Academy Petroleum has specified superior materials for use in its construction, resulting in reliable sealing performance under a wide range of operating conditions. The steel reinforcing inserts are made from high quality low alloy steel that meets the requirements of NACE MR0175 for sour service applications. The elastomeric compound used in this Packing Element is Hydrogenated Nitrile Butadiene Rubber (HNBR), also known as Highly Saturated Nitrile (HSN). HNBR is used widely in the oil & gas industry particularly where Hydrogen Sulfide (H2S) gas is present due to its ability to withstand a wide variety of oils, fuels, and other chemicals. HNBR exhibits good weathering resistance and excellent mechanical properties in terms of tensile strength, tear modulus, elongation at break and abrasion resistance.

Our Packing Element design has been tested rigorously in accordance with API Specification 16A to ensure proper functionality and reliable sealing performance. In addition, each Packing Element is thoroughly inspected and fully function tested in accordance with API Specification 16A prior to leaving our facility.

Packing Element Specifications
Rated Working Pressure10,000 PSI (69.0 MPa)
Maximum Outside Diameter15.03 in (382 mm)
Minimum Inside Diameter5.44 in (138 mm)
Overall Height6.82 in (173 mm)
Weight65 lbs (30 kg)
Temperature Rating0°F to 250°F (-18°C to 121°C)
Rated for H2S Service as Defined by API 16A & NACE MR0175

5 1/8” - 10,000 Spherical Blowout Preventer Parts List

11Lower Housing
31Adapter Ring
41Upper Housing
51Packing Element
620Housing Closure Studs
720Housing Closure Hex Nuts
82Seal, Adapter Ring
92Seal, Lower Housing
102Seal, Piston
1112Flange Studs
1212Flange Hex Nuts
131Wear Strip, Lower Housing
142Wear Strip, Piston
151Wear Strip, Adapter Ring
161O-Ring, Adapter Ring (Outer)
171O-Ring, Adapter Ring (Inner)