Huahui’s Wellhead Control System is professionally designed to be modular and reliable, while still adapting to the client’s specifications. Its design is based on proven technology in hydraulic and pneumatic controls to flawlessly operate, monitor, and protect the well. It is designed to shut in the surface controlled subsurface safety valves (SCSSV) and the surface safety valves (SSV)  for production or injection wells when various alarm conditions are activated. In addition, it can be linked to associated systems such as chemical injection pumps, external pressurized loops, and through Remote Transmission Units (RTU) base to on-shore control systems.  

      Like all of Huahui’s products, this system is designed to the standards and for the harsh environmental conditions commonly found in industry. Each SSV/DHSV control circuit is provided with important interlock devices to open/close the valves. The materials and components used throughout are carefully selected to ensure maximum performance. The labeling is clear and operation procedures are concise.

FEATURES & BENEFITS
Operate multiple single and dual producing strings.

Operate multiple single and dual injection strings.

Interchangeable modules with retrievable draw-out design simplifies both operation and maintenance purpose

Flow line pressure indication and shuts in wells.

Bypass facilities for maintenance, on-line services and start-up operation.

Rugged offshore construction：

Utilizes only proven design and reliable components.

·  Material used is 316 stainless steel construction (unless otherwise indicated).

·  Panels are fabricated from 316 stainless steel, with minimum 3 mm thickness.(Painting applies where applicable.)

·  Well organized layout and extensive component tagging simplify operation and servicing.

·    Component tagging is cross-referenced to drawings for fast troubleshooting. Schematics use easy-to-read modified ISA symbology.

·  Provides a fail-safe shutdown of wellhead surface valve, SSV (Master/Wing Valves) in the event of a hazardous and/or abnormal operating conditions.

·  Provide a fail-safe shutdown of wellhead sub-surface safety valve, DHSV (Down hole Valves) in the event of hazardous and/or abnormal operating conditions.

·  Panel logic is designed with the first-out indication logic.

·  Properly sized distribution header for Instrument Air and Hydraulic Supply.

·  Fittings are AISI 316 Stainless Steel, double ferrule compression Swagelok type.

·  Tubing are 316 Stainless Steel, seamless ASTM A269, fully annealed.

SPECIFICATIONS
·  Certifications:  Ex(d) certified and suitable for use in Zone 1 group   IIA Class T6 according to IEC 79.

·  Panel enclosure design to IP65 minimum.

·  Factory calibration to API standard.

Environmental Data:  

·  Enclosure IP65

·  Operating temperature -20°C ~ +60°Cw

·  Storage temperature -30°C ~ +60°Cw

·  Humidity 0% ~ 100%( condensing )

Physical Data:  

·  enclosure, material : Stainless steel 316w

·  enclosure, dimensions: Custom requirement.

Power Supply:  

·  Nominal 24 VDC (18-36 VDC)

·  Power consumption (confirmed per configuration)        Utilities :  

·  Panel operated with two main sources of energy.

·  Instrument Air / Instrument Gas / Sour Gas4 bar to 10 bar (or as requested).

·  Hydraulic System

·  - DHSV : 500 to 5000 psig (or as requested)  

- SSV: 2500 to 3000 psig (or as requested)

Documentation:  

·  Operating Instruction Manual

·  Start-Up Manual

·    Maintenance Manual

·  Sizing Calculation

·  Mill Certificates / Certificate of Compliance

·  Test Procedure

·  Utilities Consumption Calculations: 24 VDC & Air/Gas Supply.

·  Functional Design Specification.

·  Design Drawings