Product Overview

The electro-pneumatic BOP control system, commonly known as a Koomey unit, is the central hydraulic power unit for surface Blowout Preventer (BOP) stacks. It stores high-pressure hydraulic fluid in accumulator bottles and delivers controlled pressure to open or close BOP rams, annular preventers, and hydraulic gate valves during drilling, workover, and well intervention operations.

Deenpu Machinery supplies FKQ (pneumatic-liquid) and FKDQ (electro-pneumatic-liquid PLC controlled) series BOP control systems with accumulator capacities from 25L to 1,600L, supporting 2 to 14 controlled BOP functions. All systems meet API 16D specifications and are ISO 9001-2015 certified by DNV. We offer complete customization: choose your number of control stations, accumulator volume, explosion-proof rating, communication protocol, and housing type.

How the Koomey Unit Works

The system relies on three integrated power sources to guarantee uninterrupted BOP control:

1. Electric Triplex Plunger Pump — The primary power source. An explosion-proof motor drives a triplex plunger pump (80 mL/rev or 60 mL/rev) that draws hydraulic oil from the reservoir and pressurizes the accumulator bank to 21 MPa (3,000 psi).
2. Pneumatic Pump — The backup power source. When rig air supply (0.65–0.8 MPa / 93–115 psi) is available, the pneumatic pump (120 mL/stroke) automatically supplements or replaces the electric pump — critical during power loss or emergency shutdowns.
3. Accumulator Bank — Nitrogen-precharged bladder or piston accumulators store pressurized fluid at 7 MPa (1,000 psi) pre-charge. Usable volume ranges from 25L to 800L, providing instant high-flow hydraulic power to function BOP components with zero pump lag.

The system regulates output pressure from 0–14 MPa (0–2,000 psi) via adjustable relief valves. On FKDQ models, a Siemens PLC monitors system pressure, accumulator status, and BOP position via Profibus DP communication, enabling full remote operation from the driller’s console or a wireless tablet PC.

Key Features

Applications

• Onshore and offshore drilling rigs — primary BOP stack control
• Workover and snubbing units — compact FK/FKQ portable models
• Well testing and completion operations
• Coiled tubing and hydraulic workover (HWO) spreads
• Offshore platforms and jack-up rigs — corrosion-resistant offshore packages
• Drilling contractor fleet standardization programs

Technical Specifications — FKDQ / FKQ Series

System Parameters

Model Selection Guide

FKQ = pneumatic-liquid • FKDQ = electro-pneumatic-liquid PLC type. Full range 25L – 1,600L available. Request the complete selection table with all 35+ configurations.

When Ordering, Please Specify

To provide an accurate quotation and datasheet, include the following with your inquiry:

1. BOP Stack ConfigurationNumber and type of BOPs (annular, ram, shear ram, HCR valve) with their closing ratios.
2. Number of Controlled FunctionsHow many hydraulic control stations required (typically 2 – 14).
3. Accumulator CapacityTotal accumulator volume in liters based on your BOP stack closing volume calculation.
4. Control TypeFKQ (pneumatic-liquid) or FKDQ (electro-pneumatic PLC).
5. Remote Control StationsDriller’s console, auxiliary console, or wireless tablet PC (T800).
6. Explosion-Proof RatingEx d IIB T4, Ex d IIC T6, or non-explosion-proof.
7. HousingOpen skid, weather-protected, insulated, or offshore corrosion-resistant.
8. Power SupplyVoltage and frequency (380V/50Hz, 480V/60Hz, 600V/60Hz).
9. Communication ProtocolProfibus DP (standard), Modbus RTU, or Ethernet/IP.
10. Optional AccessoriesPNT auto-recording module, standby nitrogen system, pipe rack and hose kit, zero-pressure starting module.

Custom Manufacturing & OEM Capability

• Brand Customization — Nameplates, paint colors, and documentation branded to your requirements.
• Electrical Configuration — Motors, starters, and control panels adapted to any global voltage/frequency standard.
• Hydraulic Interface — Custom manifold layouts, flange types, and hose/pipe connections to match existing rig infrastructure.
• Accumulator Configuration — Bladder or piston type, vertical or horizontal mounting, single or dual bank.
• Control Station Layout — Custom panel layout, labeling language (English, Arabic, Spanish, Russian, Chinese), and function grouping.
• Skid Design — Offshore-certified lifting frames, DNV 2.7-1 cargo baskets, compact footprints for limited deck space.

Quality Control & Testing Standards

• Accumulator bottles hydrostatically tested to 1.5× working pressure (31.5 MPa) per API 16D.
• Complete system function tested at factory — pumps, relief valves, pressure switches, control manifold verified under simulated operating conditions.
• Nitrogen leak test on each accumulator prior to shipment.
• Electrical components megger tested for insulation resistance.
• PLC program verified and pre-loaded before shipment.
• Material certificates (MTC) and pressure test reports provided with each unit.
• Third-party inspection by DNV, BV, SGS, or ABS available upon request.

Frequently Asked Questions