Project Synopsis

Develop a plan and and execute a design for smoothing delivery of coker product streams to several different refinery hydrotreating units.

Project Summary


The client operates an independent petroleum refinery. Process Engineering Associates, LLC (PROCESS) was contracted to help conceive and execute a design for smoothing the delivery of coker product streams to their respective hydrotreating units.  This is for a new delayed coker providing the refinery with 3 cracked stocks for further processing. Due to these unsaturates, hydrotreating exotherms will be highly dependent on the control of these streams, which have flows that vary considerably.  A robust design was critical for the stable operation of the refinery.  PROCESS‘ tasks included:

  • Evaluation of existing controls and storage systems
  • Integration of three new streams into the refinery’s existing piping and storage infrastructure
  • Execution of hydraulic calculations along with piping/component, control valve, and pump specification and design
  • Design of tank blanketing systems for the cracked stocks

As a result of this project:

  • The refinery will have stable delivery of cracked stock to the respective hydrotreating units without the relative exotherm maintenance.
  • The coker will maintain uninterrupted operation during prolonged downstream upsets.
  • Strait run naphtha, diesel and gas oil storage will be increased due to the integration of these into the coker control systems.

The documentation PROCESS submitted to the client included: modified process flow diagrams (PFDs) and piping and instrumentation diagrams (P&IDs); computer process simulation outputs; piping schedules; control valve and pressure relief valve (PRV) specifications; and control system specifications.

Industry Type

  • Petroleum Refining

Utilized Skills

  • Process improvement skills
  • Refined products management
  • Control systems evaluations
  • Storage systems design

Contact Us