Location: Dubach, LA

Services:  Engineering Design and Balance of Plant, Process and Systems Integration

Dubach Gas Processing Facility Expansion

The Houston Interests companies, River Consulting, Devco and S&R Technical Services, partnered with ISTI Plant Services to provide electrical engineering, balance of plant and procurement for a major gas processing facility expansion.

The balance of plant engineering and procurement activities included the integration of a pipeline pig receiving area with a condensate stabilizer. Triethylene glycol dehydrator was installed to dehydrate the inlet gas. Other integrations included a 70MMSCFD modular cryogenic plant from Thomas Russell Co., a glycol reconcentrator with BTEX unit and a residue gas line to the plant fence and other ancillary equipment. 

River Consulting provided a new plant control system, which consisted of Rockwell Automation ControlLogix processors and centralized I/O. Software engineering was provided with PLC code being generated to control the plant processes. The new fully commissioned natural gas processing train allows the client to handle an increase in upstream supply while meeting gas processing requirements.


  • Rockwell Automation ControlLogix new plant control system
  • Integration of pipeline pig receiving area with a condensate stabilizer
  • Integration of triethylene glycol dehydrator
  • 70 MMSCFD modular cryogenic plant and a glycol reconcentrator with BTEX unit
  • Residue gas line to the plant fence for tie-in by others
  • Project management, procurement, and engineering design
  • Engineering design related to the cryogenic plant installation design and drawings, including pipe rack connections for the cryogenic plant and refrigeration plant to the BOP equipment
  • Piping diagrams
  • Motor Control Center (MCC)
  • Programming of control system to interface with HMI
  • Factory Acceptance Testing (FAT)
  • PLC programming
  • Switchgear, control panels, operator stations and electrical building