Description

11″ 10M WP Annular BOP | FH28-70 | API 16A | 10,000 PSI | CAMTOP



Key Features



API SPEC 16A Compliant: Designed, manufactured, and tested to API Spec 16A standards for annular blowout preventers. Available in PSL1, PSL2, and PSL3 specification levels.



10,000 PSI Working Pressure: Rated for 10,000 psi (70 MPa) with hydrostatic body test pressure of 15,000 psi (105 MPa), making it suitable for deep and high-pressure well applications.



Spherical Sealing Element Design: Advanced spherical geometry ensures uniform, gas-tight sealing across the full pipe range from 3-1/2″ to 11″, plus open hole closure — minimizing wear and extending service life.



NACE MR-01-75 Compliant: All pressure-containing and wetted components manufactured from H₂S-resistant materials, making this BOP fully suitable for sour gas service environments.



Field-Replaceable Split-Type Packing Unit: Split packing unit option enables rapid on-site replacement without removing the BOP from the stack or stripping the drill string — minimizing costly downtime.



Wide Temperature Range (T-75): Rated for operation from -59°C to +121°C (-74°F to +250°F), covering arctic cold through high-temperature geothermal and deep well conditions.



Dual Chamber Hydraulic System: Separate close (49.5 L) and open (42.3 L) hydraulic chambers with ≤1,500 PSI actuation pressure for responsive, reliable BOP operation.



Flexible Top & Bottom Connections: Available in 11″ 10M studded or flanged configurations. Custom adapter options available on request.



Robust Alloy Steel Construction: Body and housing forged from high-strength low-alloy steel with nickel-based alloy ring groove overlay for superior corrosion resistance and extended service life.



Simple Maintenance Design: Only 7 major structural components. The sealing element can be accessed and replaced without full disassembly of hydraulic connections.



Technical Specifications

Parameter Specification
Model FH28-70
Nominal Bore 11″ (279.4 mm)
Working Pressure 10,000 psi (70 MPa)
Hydrostatic Test Pressure 15,000 psi (105 MPa)
Top Connection 11″ – 10,000 psi (Studded / Flanged)
Bottom Connection 11″ – 10,000 psi (Studded / Flanged)
Sealing Range 3-1/2″ ~ 11″ (88.9 mm ~ 279.4 mm)
Piston Close Pressure ≤ 1,500 psi (10.3 MPa)
Piston Open Pressure ≤ 1,500 psi (10.3 MPa)
Close Chamber Volume 49.5 L (13.08 gal)
Open Chamber Volume 42.3 L (11.17 gal)
Hydraulic Fluid Recommendation Water with soluble oil
Packing Unit Type Full-ring / Split-type (field replaceable)
Approximate Weight 9,800 kg (21,605 lbs)
Design Standard API SPEC 16A
Product Specification Level PSL1 / PSL2 / PSL3
Performance Requirement PR1 / PR2
Sour Service NACE MR-01-75 Compliant
Temperature Rating T-75: -59°C to +121°C (-74°F to +250°F)



Main Components

Component Description
Upper Housing (Cover) Top pressure-containing housing with 11″ 10M API connection; high-strength low alloy steel forging
Lower Housing (Body) Main body with 11″ 10M API bottom connection; includes hydraulic ports and integral wear ring
Sealing Element (Packer) Steel-reinforced elastomer spherical sealing element; seals on pipe sizes from 3-1/2″ to 11″; available in full-ring or split-type
Adapter Ring Steel adapter ring that transmits hydraulic force from the piston to the sealing element
Piston Double-acting hydraulic piston with upper/lower seals and wear rings; actuates the sealing element
Locking Ring Secures the upper housing to the body; precision-machined for positive mechanical lock
Locking Segments Segmented locking mechanism providing positive mechanical engagement during operation
Ring Grooves API ring grooves with nickel-based Alloy 625 weld overlay for long-term corrosion protection
Lifting Shackle Top-mounted lifting eye for safe rig handling and BOP stack installation



Assembly Drawing

The cutaway diagram below illustrates the internal structure and key components of the CAMTOP FH28-70 11″ 10M WP Annular BOP:

FH28-70 11-inch 10,000 PSI Annular BOP Assembly Drawing — CAMTOP


① Upper Housing — High-strength alloy steel forging with 11″ 10M top connection



② Locking Ring — Secures the upper housing assembly to the body; precision-threaded



③ Locking Segments — Segmented locking mechanism for positive operational engagement



④ Sealing Element (Packing Unit) — Spherical steel-reinforced elastomer; seals 3-1/2″ to 11″ pipe & open hole



⑤ Adapter Ring — Transmits hydraulic force from piston to sealing element; steel construction



⑥ Piston — Double-acting hydraulic piston with wear rings and upper/lower seals



⑦ Body (Lower Housing) — Heavy-wall alloy steel forging; main pressure-containing component with 11″ 10M bottom connection

Note: Assembly drawing is for reference only. Actual configuration may vary based on PSL level and customer specifications.



Applications



Onshore drilling rigs requiring 10,000 PSI annular blowout prevention capability



Offshore platform, jack-up, and semi-submersible rig BOP stacks — weight-optimized for offshore handling



Stripping operations — pipe movement under pressure through closed BOP with controlled annular pressure



Workover and well intervention with various tubular sizes in live well conditions



Snubbing / Hydraulic Workover (HWO) — stripping pipe under pressure for snubbing operations



H₂S / sour service wells — NACE MR-01-75 compliant materials for safe hydrogen sulfide operation



Quality Assurance & Testing



Performance testing per API SPEC 16A requirements before delivery with complete inspection reports



Dimensional inspection of all major components per API 16A with documented records



Mechanical property test reports for all pressure-containing parts and connection studs



Chemical composition reports for pressure-containing parts, studs, and critical components



NDE reports: Ultrasonic Testing (UT) and Magnetic Particle Inspection (MPI) on all critical areas



Complete documentation package: material certificates, NDE records, hydrostatic test reports, and operation manual (3 copies)



Frequently Asked Questions

Q1: What is the sealing range of the 11″ 10M Annular BOP?

The CAMTOP FH28-70 Annular BOP seals on pipe diameters from 3-1/2″ to 11″ (88.9 mm to 279.4 mm), and can also close on open hole. The spherical sealing element ensures a gas-tight seal across the full range.

Q2: Is the FH28-70 Annular BOP suitable for H₂S (sour gas) service?

Yes. The CAMTOP FH28-70 is fully compliant with NACE MR-01-75 standards for sour gas / H₂S service. All pressure-containing and wetted components are manufactured from materials specifically selected for hydrogen sulfide environments.

Q3: What is the required closing and opening pressure?

Both the closing and opening piston pressure are ≤1,500 PSI (10.3 MPa). The closing chamber volume is 49.5 liters (13.08 gallons), and the opening chamber volume is 42.3 liters (11.17 gallons). We recommend water with soluble oil as the hydraulic operating fluid.

Q4: What API specification level is the FH28-70 certified to?

The FH28-70 is manufactured per API Spec 16A and available in PSL1, PSL2, and PSL3 specification levels, with PR1 or PR2 performance requirements. Every unit is factory pressure-tested and fully certified before shipment.

Q5: How much does the 11″ 10M Annular BOP weigh?

The approximate weight of the CAMTOP FH28-70 is 9,800 kg (21,605 lbs). Its compact design ensures manageable weight for both onshore and offshore rig handling.

Q6: Can the packing unit be replaced in the field?

Yes. CAMTOP offers both full-ring and split-type packing units for the FH28-70. The split-type design enables rapid on-site replacement without removing the BOP from the stack or stripping out the drill string — significantly reducing costly downtime.

Q7: What connection types are available?

Both top and bottom connections are 11-inch 10M rated, available in studded or flanged configurations per API 6A / 16A standards. Custom adapter configurations are also available upon request.

Q8: What is the temperature rating?

The temperature class is T-75, rated for operation from -59°C to +121°C (-74°F to +250°F). This covers extreme arctic environments through high-temperature geothermal and deep well applications.

Q9: What is the difference between 5M and 10M Annular BOPs?

The key difference is the working pressure rating: 5M BOPs are rated for 5,000 PSI, while 10M BOPs are rated for 10,000 PSI. The 10M version features heavier-duty materials, thicker body walls, and higher-grade seals to safely handle deep, high-pressure wells.

Q10: How often should annular BOPs be pressure tested?

Per API RP 53 and standard industry practice, annular BOPs should be function-tested daily during drilling operations and pressure-tested at least every 21 days, or as required by local regulatory bodies. CAMTOP recommends a low-pressure test at 200–300 PSI followed by a high-pressure test at the rated working pressure.



Why Choose CAMTOP?



API SPEC 16A compliant design and manufacturing with full material traceability



ISO 9001 certified quality management system ensuring consistent product quality



Factory-direct pricing with global shipping — no middleman markup



Complete documentation package: material certificates, NDE reports, pressure test records, and operation manuals



All ring grooves welded with Ni-based Alloy 625 for long-term corrosion protection



Spare parts and seal kits readily available from stock for rapid deployment



Dedicated technical support including installation guidance and maintenance training



10+ years of oilfield equipment manufacturing experience serving global drilling contractors



Contact Us


Email:
sales@cposl.com


Phone: 86-18621723891


Web:
www.camtop-oilfieldtools.com


Address: No. 432, Fute North Road, Pudong District, Shanghai, China