About this opportunity
Nikkiso Co. lists this Senior Process Engineer opportunity in irvine, California. Review the employer’s description below for duties, qualifications and application requirements.
Job description
Company Overview
Nikkiso Clean Energy & Industrial Gases is a leading provider of cryogenic pumps, heat exchangers, process systems, services, and solutions for the LNG and industrial gases industry. We are a subsidiary of Nikkiso Company Ltd, a leading industrial manufacturer headquartered in Tokyo, Japan, with over $1.5 B in annual revenue, 8000 + employees worldwide, and publicly traded on the Tokyo Stock Exchange.
Job Overview
The Senior Process Engineer leads process system design and technical definition for skid-mounted and modular process packages in an EPC execution environment. This role is responsible for developing and validating the process design basis, ensuring system operability, and integrating process requirements across mechanical, I&C, and package design.
A core responsibility of this role is ownership of process simulation models , ensuring that simulation results are accurate, validated, and fully aligned with design deliverables, vendor data, and operating philosophy.
The position requires strong experience in oil & gas, LNG, cryogenic, or industrial gas systems, with the ability to translate simulation outputs into practical, fabrication-ready engineering solutions.
Responsibilities
Process Design & System Definition
Develop and lead:Process Design Basis
PFDs (Process Flow Diagrams)
P&IDs (Piping & Instrumentation Diagrams)
Heat & Material Balances
Utility balances
Line sizing calculations
Relief and flare calculations
Define operating philosophy including startup, shutdown, turndown, and upset conditions
Ensure accurate representation of process control strategies within P&IDs
Process Simulation (Core Responsibility)
Develop, own, and maintain steady-state and dynamic process simulation models using:Aspen HYSYS
Validate simulation models against:Design basis
Vendor data
Operating conditions
Perform sensitivity studies and optimization analyses
Generate simulation-based deliverables including:Stream tables
Equipment duty calculations
Control strategy inputs
Support dynamic simulation where required for control philosophy validation
Ensure alignment between simulation outputs and engineering deliverables (PFDs, datasheets, P&IDs)
Engineering Deliverables
Develop and review:Process datasheets (equipment, valves, instruments)
Control narratives (in coordination with I&C)
Cause & effect inputs
Process calculations and reports
Ensure consistency between simulation models and issued documentation
Integration & Coordination
Work closely with Mechanical, I&C, and Design teams to ensure:Equipment sizing aligns with simulation outputs
Control philosophy reflects process dynamics
Layout supports operability and maintainability
Participate in HAZOP, design reviews, and interdisciplinary coordination
Vendor & Package Integration
Define process requirements for vendor packages
Review vendor process design, calculations, and performance guarantees
Validate vendor data against simulation assumptions
Ensure seamless integration of vendor systems into overall process package
Fabrication & Execution Support
Ensure process design is aligned with skid fabrication constraints
Support FAT, commissioning, startup, and troubleshooting
Resolve process-related issues during fabrication and operation
Standards & Compliance
Ensure compliance with industry standards and client specifications
Support safety, operability, and reliability reviews
Qualifications
Bachelor’s degree in Chemical Engineering
10–15+ years of experience in oil & gas, LNG, cryogenic, or EPC industries
Advanced proficiency in process simulation tools (Aspen HYSYS, Aspen Plus, UniSim)
Strong experience linking simulation outputs to engineering deliverables
Experience with skid-mounted systems and modular design
Strong understanding of ENGINEERING workflows
Preferred Qualifications
Experience with dynamic simulation and control validation
Experience with cryogenic or industrial gas processes
Background in packaged equipment or modular systems
Desired Attributes
Strong system-level thinking
Ability to translate simulation into practical design decisions
Strong coordination and communication skills
Execution-focused mindset
Work Environmental and Physical Demands:
In order to perform the duties of this job, the employee may be required to stand, walk, sit, reach with hands and arms, climb or balance, stoop or kneel, talk and hear, and use fingers and hands to feel objects, tools or controls.
Overtime may be necessary as the workload dictates. This may include week days, weekends, nights and/or holidays.
Job will generally be performed in an office environment, but may require travel to a customer's office, production facility or industrial/construction job site. Conditions will vary at each location, but the conditions listed above will generally apply.
The knowledge, skills and abilities listed above are typically acquired through the levels of education and experience listed. An equivalent combination of education and/or experience that provides an applicant with the listed knowledge, skills and abilities required to perform the essential duties and responsibilities of the job, may be accepted.
Other Duties
Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.
Salary: $85,000 - $120,000 annually
EEOC Statement
Nikkiso CE&IG is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.
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Worksite address
irvine, CA, 92713, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.