Hydraulic Power Units (HPU) for Subsea, Safe & EX ApplicationsOffshore/Products
HYDRAULIC POWER UNITS (HPUs)
RELIABLE POWER FOR CRITICAL OPERATIONS
Hydraulic Power Units (HPUs) are compact units that enable the operation of systems by providing the power required to move subsea or topside valves. They are designed to provide a stable supply of cleaned (classified) hydraulic fluid to the control systems. Today, HPU remains a key component in marine, offshore and subsea operations.
MOWE HYDRAULIC
VALVE REMOTE CONTROL SYSTEM
MOWE partners with Nakamura Japan for complete HPU and accumulator packages.
The classification consists of the filtration procedure that guarantees a high cleaning index of the hydraulic fluid to avoid damaging control blocks of valves and other components of the system by the undue presence of solid particles. For Power Hydraulic Units of Submarine Control Systems, a very rigorous international standard is used, such as the National Aerospace Standard (NAS) 1638 and ISO 4406. The efficiency of the classification is guaranteed through analysis of laboratory sample or the use of particle counter online or portable.
MOWE provides complete Hydraulic Power Unit (HPU) engineering, fabrication, integration and testing services for marine, offshore and subsea applications. Systems can be customized to meet project-specific operating pressure, flow rate, control philosophy and classification requirements.
KEY FEATURES
BASIC COMPONENTS OF A HPU
Storage tanks (return and supply): Manages initial fluid load, fluid return from actuators, and stores classified fluid for supply pumps and accumulators.
Filling pump: Transfers hydraulic fluid from original containers into the return tank and assists in periodic fluid classification.
Hydraulic supply pumps (electrical and pneumatic): Supplies hydraulic power by raising fluid pressure to design values, using electric and pneumatic options in parallel.
Filters for classification of hydraulic fluid: Meets various pressure and cleaning classes with automated monitoring features like differential pressure transmitters.
More than 75% of failures in hydraulic and lubrication systems are due to over-contamination. Dirt particles can cause expensive and large machines to fail.
RELATIVE PARTICLE SIZE
Source: www.parker.com
* A micron is equal to one-millionth of a meter.
| Substância | Microns | Polegadas |
|---|---|---|
| Grão de sal refinado | 100 | .0039 |
| Cabelo humano | 70 | .0027 |
| Limite máximo de visibilidade | 40 | .0016 |
| Farinha de trigo | 25 | .0010 |
| Células vermelhas do sangue | 8 | .0003 |
| Bactéria | 2 | .0001 |
ACCUMULATOR APPLICATION
Hydraulic fluid specific for the application used: Determined according to its composition that will determine properties such as density, viscosity, tolerance to possible contamination by sea water, biodegradability, can be oil-based (more suitable for Topside) or water-based (indicated for Subsea).
Pressure accumulator bank: Accumulators can perform a very wide range of functions in the hydraulic system. In the case of HPUs, their primary function is to maintain system pressure, conferring stability to the system, and avoiding frequent outlets of supply pumps.
WATCH VIDEO
The video shows the operation of a bladder-type hydraulic accumulator that receives a pneumatic pre-load pressure in the bladder located inside (usually Nitrogen) that will be equalized by hydraulic pressure. By reducing the pressure in the hydraulic circuit the bladder will press the fluid from its interior back to the circuit compensating the system losses, avoiding sudden losses in the pressure.
Pressure regulating valves: HPUs typically produce a higher pressure energy than is strictly necessary to move their consumers, leaving their accumulator bank functioning as a "lung" and allowing only the pressure set correctly to their pressure points consumption. This is the function of the pressure regulating valves, that is, to promote the "pressure break" necessary to feed the consumers, relieving any excess pressurized fluid to the return tank through its own line.
Directional valves: They are responsible for getting the pressure where it is needed, allowing the flow of the pressurized fluid through different ways to perform a job, such as the movement of the remote-actuated valve actuator.
Instrumentation for level and pressure monitoring: A key part of HPU's integration into the automation and process control system of an oil and gas production platform, both essential for productivity and process safety.
TECHNICAL SPECIFICATIONS & ENGINEERING STANDARDS
- Local and Remote Control
- PLC-based Control Systems
- EX / ATEX Design Options
- IP56 Protection for Motors and Electrical Cabinets
- Dual Power Supply Redundancy (Optional)
- Class Approval: ABS, Lloyd's Register (LR), Bureau Veritas (BV)
- Automatic and Manual Operation
APPLICATIONS OF HYDRAULIC SYSTEMS IN MARINE, OFFSHORE, OIL AND GAS INDUSTRIES
- Valve Control Systems
- Well head control panels
- Modular hydraulic skids on power or engines
- Chemical Injection skid piston pumps
- Potable / Hot water packages
- Emergency Pump Packages
- Cargo System, Winches & cranes
- Accumulator packages
- Cylinder push and pull packages for bridges, doors and other applications
FEATURES AND BENEFITS
- Provide High-pressure or low pressure hydraulic systems
- Electrical controlled systems
- Packaged with Motor or Engines for Safe or Hazardous Areas.
- Skid, Modular, compact and easy to install
- Interface with ICSS or plain local operations.
- Wide range of components, Valves and options making design options very versatile.
- Skid or Modular, Framed or supplied loose
- Remote Control (optional)
PROJECT EXPERIENCE
- Petronas Offshore Developments
- Electrical controlled systems Shell Offshore Projects
- Chiyoda EPC Packages
- FPSO & FSO Hydraulic Packages
- Mitsui Offshore Applications
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