Skip to main content
Home Home

Main navigation

  • Industries
    • Products
    • Operations
    • Performance
    • People
    • Contributions

    Industries

    We represent the makers of the fuels that keep Americans moving and the petrochemicals that are the essential building blocks for modern life. Our industries make life better, safer, more productive and — most of all — possible.

  • Issues
    • Fuels & Vehicles
    • Environment
    • Petrochemicals
    • Safety & Health
    • Security
    • Tax & Trade
    • Transportation & Infrastructure
    • Regulatory Reform

    Issues

    We advocate for public policies that promote growth and investment in the refining and petrochemical manufacturing industries to help drive our economy, add jobs, increase energy security and remain competitive in a global economy.

  • Events
    • My Meetings
    • Speaker Guidelines
    • Meeting FAQ
    • Sponsorship
    • Upcoming Events

    View AFPM Calendar of Events

    We offer a portfolio of first-in-class events that educate our members and other stakeholders on critical technical and advocacy issues, supporting the safety, security and success of the fuel and petrochemical industries.

     

  • Newsroom
  • Search
    Enter a list of keywords and press Enter to submit your search query.

Utility Menu (Mobile)

  • About Us
  • Membership
  • Data & Reports
  • Safety Programs

User account menu

  • My AFPM

Social Media Menu - Header

  • Icon
  • Icon
  • Icon
  • Icon
  • Icon

Utility Menu

  • About Us
    • About AFPM
    • Our History
    • Careers
    • Contact Us
  • Membership
    • AFPM Membership
    • Member Directory
  • Data & Reports
    • Data & Statistics
    • Publications
    • Technical Papers
    • Annual Report
    • Sustainability Report
  • Safety Programs
    • Safety Portal
    • Advancing Process Safety Programs
    • Occupational Safety Programs
    • Safety Statistics Programs
    • Safety Awards & Recognition
Enter a list of keywords and press Enter to submit your search query.

Q&A

Find the answer to your technical question in AFPM's extensive Q&A database.

wave
  1. Data & Reports
  2. Technical Papers
  3. Q&A

Q&A

These digital transcripts are meant to share information on process safety practices in order to help improve process safety performance and awareness throughout industry. The goal is to capture and share knowledge that could be used by other companies or sites when developing new process safety practices or improving existing ones. The documents being shared have been used by an industry member, but this does not mean it should be used or that it will produce similar results at any other site. Rather, it is an option to consider when implementing or adjusting programs and practices at a site. ​

BY THEMSELVES, THESE DIGITAL TRANSCRIPTS ARE NOT STANDARDS OR RECOMMENDED PRACTICES. THEY ARE NOT INTENDED TO REPLACE SOUND ENGINEERING JUDGMENT. THEY DO NOT PRECLUDE THE USE OF ALTERNATIVE METHODS THAT COMPLY WITH LEGAL REQUIREMENTS. A SUBJECT MATTER EXPERT SHOULD BE CONSULTED PRIOR TO DETERMINING WHETHER A PRACTICE CAN BE USED IN ANY SPECIFIC SITUATION. 

​

Process

  • Gasoline Processing
    • Safety
    • Gasoline Processing
    • Desalting
    • Reforming
    • Aromatics
    • HF Alkylation (HF Alky)
    • Blending
    • Plant Services
  • FCC
    • Alkylation
    • Environmental
    • Catalysts
  • Crude/Coking
    • (-) Coker
    • Process
    • Operations
    • Corrosion
    • Mechanical
    • Crude Quality
    • Vacuum Tower
    • Distillation
    • CAT POLY Units (CAT Poly)
    • Desalting
    • Naphtha Hydrotreating
    • Safety
  • Hydroprocessing
    • Catalysts
    • Resid Hydrocracking
    • Hydrocracking Catalyst
    • Feed Quality
    • Fouling
    • Naphtha Hydrotreating
    • ULSD

Year QA

  • 2018
Search Filters

Process

  • Gasoline Processing
    • Safety
    • Gasoline Processing
    • Desalting
    • Reforming
    • Aromatics
    • HF Alkylation (HF Alky)
    • Blending
    • Plant Services
  • FCC
    • Alkylation
    • Environmental
    • Catalysts
  • Crude/Coking
    • (-) Coker
    • Process
    • Operations
    • Corrosion
    • Mechanical
    • Crude Quality
    • Vacuum Tower
    • Distillation
    • CAT POLY Units (CAT Poly)
    • Desalting
    • Naphtha Hydrotreating
    • Safety
  • Hydroprocessing
    • Catalysts
    • Resid Hydrocracking
    • Hydrocracking Catalyst
    • Feed Quality
    • Fouling
    • Naphtha Hydrotreating
    • ULSD

Year QA

  • 2018
Filters

(2018) Question 36: How do you manage the potential negative impacts of H2S Scavengers in imported coker feed?

How do you manage the potential negative impacts of H2S Scavengers in imported coker feed?
Read more

(2018) Question 37: Do you extend the time between de-coking the furnace by cutting coil outlet temperature or cutting furnace charge? How often are spallings done in coker furnaces? What is the temperature recovery after spalling?

Heater fouling is dependent on several variables that include the process film temperature, residence time at temperature and coke precursor concentration. I like to target a coke drum outlet temperature of 825°F before quench injection, which normally requires a Coker heater outlet temperature of 925°F.
Read more

(2018) Question 38: How does coke morphology vary with changes in feed quality? What feed tests do you require to quantify the impact on coke quality?

Predicting coke morphology from feed properties has not been 100% successful as the Coker operating conditions can make a difference if the feed is close to the shot coke vs. sponge coke threshold. The traditional approach uses the asphaltene content of the feed divided by the concarbon value of the feed.
Read more

(2018) Question 39: What operating conditions increase the generation of coke fines? What reliability issues do you associate with increased fines production?

Coke fine generation is really a function of the coke cutting process. Feed stock and coke drum operations during the actual drum fill cycle have very little to nothing to do with the generation of coke fines.
Read more

Data & Reports

  • Data & Statistics
  • Publications
  • Technical Papers
  • Annual Report
  • Sustainability Report

Stay in the Know

Subscribe to our monthly industry insights newsletter.

Footer menu (first)

  • My AFPM
  • Events
  • Safety Portal
  • Petrochemical Portal

Footer menu (second)

  • Contact Us
  • Privacy Policy
  • Legal

Connect with Us

  • Icon
  • Icon
  • Icon
  • Icon
  • Icon

© 2025 AFPM. All rights reserved 
American Fuel & Petrochemical Manufacturers
1800 M Street, NW Suite 900 North
Washington, DC 20036

Back to Top