Ammonia Expert Witnesses

West Fork, Arkansas

Refrigeration, OSHA - Industrial process refrigeration, cold storage, ammonia, carbon dioxide, piping, insulation, design, design review, OSHA, EPA, mechanical code analysis

I have 15 years' experience as a refrigeration service/startup contractor, followed by 25 years' experience as a graduate engineer in industrial refrigeration ammonia and CO2 applications up to 5,000 TR. My engineering experience includes design and project management positions with a D/B contractor, a large food processor, an A&E firm (Deputy Director of the Food & Beverage Group) and my current consulting business. I'm registered as a PE in 19 states and have an NCEES Record. Current committee service includes the American Society of Heating, Refrigerating and Air-Conditioning Engineers (TC 10.1 and TC 10.2). I have revised portions of chapter 2 in the 2014 and 2018 editions of the ASHRAE Refrigeration Handbook, calculations of CO2 piping capacities in chapter 3 of the 2018 RHB and organized the ongoing revisions to chapter 1 of the 2026 RHB. I've been a Member of ASME B31.5 since 2019 and chaired the Committee since 2021. My work with the Refrigerating Engineers and Technic...

Coronado, California

Toxicology, Environmental - PFAS, benzene, PCE, ammonia, lead, petroleum hydrocarbons, vinyl chloride, solvents, forever chemicals, chlorinated hydrocarbons, arsenic, nitrates, metals, TCE, fertilizers, carbon monoxide, dioxins, trichloroethylene, pesticides, risk assessment

Dr. Ryer-Powder is the Principal Health Scientist at Environmental Health Decisions. She brings more than 30 years of experience in human health risk assessment, litigation support, and occupational toxicology to human health hazard and evaluation projects. Dr. Ryer-Powder is responsible for strategic preparation, project management, and evaluation of chemical toxicity for risk assessment and product hazard evaluation projects. She is called upon to investigate and analyze legal and regulatory issues and controversial claims regarding chemical causation of diseases in humans. Her solid technical background, coupled with her frequent involvement in risk and hazard evaluation projects, gives her a broad perspective on the technical, economic and regulatory considerations for human health hazard evaluation work. Dr. Ryer-Powder has done extensive work in the development of exposure levels for lead, petroleum fuels, and ammonia. She has comprehensively researched the toxicological iss...

Atlanta, Georgia

Mechanical Engineering, Refrigeration - Ammonia, Cryogenic, Compressed Gases, Carbon Dioxide, Industrial Gases, Machinery, Dry Ice, Air Compressors, Food Freezing, Ice Machines, Industrial Refrigeration, CO2, NH3, Refrigeration

Mr. Timm is a professional engineer affiliated with Forcon International as an independent contractor. He is a certified safety professional with over 40 years of experience in chemical processes, industrial refrigeration, and industrial gases. Mr. Timm has been active in codes and standards development throughout his career and continues to serve on standards committees at several organizations. He is also skilled in consequence modeling, process hazards analysis, incident investigation, and engineering design and modeling of fluid systems. Additionally, Mr. Timm's forensic investigation experience includes but is not limited to accidental cryogenic releases, ruptures of pressurized equipment, incidents involving machinery, scissor lifts, forklifts, etc. Professional Engineer registered in AL, FL, GA, MS, NC, NY, SC, TN, VA, WI and three other states. Certified Safety Professional. B11 Licensed Machinery Safety Specialist. Member of AICHE, ASHRAE, ASME, IIAR, NSPE. Board mem...