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Self Employed Gas Engineer Jobs in Riverside, CA

Nikkiso Co.

Mechanical System Design Engineer

Irvine, CA · On-site

$95 - $130/hr

Seal gas systems * Coolers and heat exchangers * Pumps and filtration systems * Pressure vessels ... Demonstrate the ability to self-improvement. Work Environment This job operates in both a ...

VSolvit

RELEASE TRAIN ENGINEER

Norco, CA · On-site

Partner closely with teams to resolve operational roadblocks and foster self-organization. • ... If you are or have recently been employed by the U.S. Government, a post-employment ethics letter ...

K2 Staffing

Sr. Mechanical Engineer - Healthcare

Irvine, CA · Hybrid

$15K - $183K/yr

... gas, plumbing design engineering, and supervision of multi-discipline teams of engineers and ... Strong organizational skills, detail-oriented, creative, self-motivated, and enthusiastic * Strong ...

VSolvit

RELEASE TRAIN ENGINEER

Norco, CA · On-site

$125K - $165K/yr

Partner closely with teams to resolve operational roadblocks and foster self-organization ... If you are or have recently been employed by the U.S. Government, a post-employment ethics letter ...

Navien, Inc.

HVAC Certification Engineer

Irvine, CA · On-site

$84K - $94K/yr

In addition, the candidate must be highly self-motivated, have a positive attitude and be ... You choose-- gas, pet care, financial advisor, gym membership, plus many more! * Monday Lunches ...

Anduril Industries

Electrical Engineer

Irvine, CA

... gas pipelines, airports and other critical infrastructure. We are looking for an Electrical ... Self starter with the ability to design digital & analog electronics from concept and functional ...

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Showing results 1-20

All JobsSelf Employed Gas Engineer JobsSelf Employed Gas Engineer Jobs in Riverside, CA

Self Employed Gas Engineer information

See Riverside, CA salary details

$55.8K

$137K

$201.9K

How much do self employed gas engineer jobs pay per year?

As of Aug 22, 2026, the average yearly pay for self employed gas engineer in Riverside, CA is $137,032.00, according to ZipRecruiter salary data. Most workers in this role earn between $113,200.00 and $153,900.00 per year, depending on experience, location, and employer.

What is the difference between Self Employed Gas Engineer vs Employed Gas Engineer?

AspectSelf Employed Gas EngineerEmployed Gas Engineer
CredentialsGas Safe Register certification, relevant qualificationsGas Safe Register certification, relevant qualifications
Work EnvironmentWork independently at various client sitesWork for an employer, often at fixed locations or sites
Employer & Industry UsageOperates as a sole trader or contractor in the plumbing/heating industryWorks for a company or organization in the same industry
Work FlexibilityHigh; controls own schedule and workloadLower; follows employer’s schedule and policies

Self Employed Gas Engineers typically work independently, managing their own clients and schedule, while Employed Gas Engineers work for a company with set hours and responsibilities. Both roles require Gas Safe Register certification and relevant qualifications, but the work environment and flexibility differ significantly.

How much can you make as a self employed gas engineer?

Self-employed gas engineers typically earn between £30,000 and £60,000 annually, depending on experience, location, and the number of jobs completed. Rates can vary from £20 to £50 per hour, with experienced engineers charging higher fees for specialized services and certifications.

How to make money as a self employed gas engineer?

Self-employed gas engineers generate income by charging clients for installation, maintenance, and repair of gas appliances and systems, often setting their own rates based on experience and market demand. Building a strong reputation, obtaining relevant certifications, and expanding services can increase earning potential. Managing scheduling and costs effectively is essential for profitability.

What cities near Riverside, CA are hiring for Self Employed Gas Engineer jobs?

Cities near Riverside, CA with the most Self Employed Gas Engineer job openings:

Self Employed Gas Engineer jobs near you
Infographic showing various Self Employed Gas Engineer job openings in Riverside, CA as of August 2026, with employment types broken down into 1% As Needed, 78% Full Time, 18% Part Time, and 3% Contract. Highlights an 92% Physical, 2% Hybrid, and 6% Remote job distribution, with an average salary of $137,032 per year, or $65.9 per hour.

Mechanical System Design Engineer

Nikkiso Cryogenic Industries

Irvine, CA • On-site, Remote

Full-time

Posted 11 days ago

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 Turbomachinery Auxiliary Systems Engineer is responsible for the design, specification, integration, and commissioning support of auxiliary systems for turboexpanders, compressors, turbines, and other rotating equipment used in energy, industrial gas, cryogenic, geothermal, and process industries. The engineer develops complete system solutions including lubrication systems, seal gas systems, cooling systems, instrumentation, controls, piping, and skid-mounted process equipment while ensuring compliance with applicable industry standards and customer specifications.
Responsibilities
System Design & Engineering
  • Design and develop auxiliary systems for turboexpanders, compressors, turbines, pumps, and rotating equipment.
  • Prepare process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs), equipment layouts, and system architecture drawings.
  • Specify and size auxiliary equipment including:
  • API lubrication oil systems
  • Seal gas systems
  • Coolers and heat exchangers
  • Pumps and filtration systems
  • Pressure vessels and accumulators
  • Control valves and instrumentation
  • Interconnecting piping systems
  • Perform process calculations for flow, pressure drop, heat transfer, and equipment sizing.

Equipment Specification
  • Develop technical specifications, datasheets, bills of materials, and procurement packages.
  • Select equipment in accordance with customer requirements and industry standards.
  • Evaluate vendor quotations and review supplier engineering documentation.
  • Ensure compatibility and integration of mechanical, process, electrical, and control systems.

Project Execution
  • Support projects from proposal through commissioning.
  • Participate in design reviews, HAZOPs, customer meetings, and bid clarification meetings.
  • Coordinate engineering deliverables across multiple disciplines.
  • Manage technical interfaces with customers, EPC contractors, and equipment suppliers.
  • Provide technical support during manufacturing, assembly, factory acceptance testing (FAT), and startup activities.

Controls & Instrumentation
  • Define instrumentation requirements and control philosophies for turbomachinery packages.
  • Develop control narratives and cause-and-effect documentation.
  • Support PLC/DCS interface requirements.
  • Review control logic for process and machinery protection systems.

Compliance & Standards
  • Ensure designs comply with applicable standards, including:
  • API 614
  • API 617
  • API 661
  • API 670
  • ASME Section VIII
  • ASME B31.1 and B31.3
  • ISA standards
  • Customer specifications and project requirements
  • Participate in design verification and quality reviews.

Commissioning & Field Support
  • Support installation, commissioning, troubleshooting, and performance testing.
  • Investigate field issues and develop engineering solutions.
  • Provide aftermarket support for operating equipment.
  • Support root-cause analyses and reliability improvement initiatives.

Qualifications
  • Bachelor's degree in Mechanical Engineering, Chemical Engineering, Petroleum Engineering, or related engineering discipline.
  • 3-5 years' experience working as an instrument and control engineer especially in turbo machinery.
  • Knowledge of the National Electric Code (NEC), UL, International Electrical Standards (IEC) , CE Directives, ATEX, etc., ISA Standards, Hazardous codes, CSA electrical panel safety codes and SIS
  • Application of the above standards to cryogenic pumps and turboexpander control systems.
  • Demonstrate an excellence interpersonal skills including communication, be a self-starter, have a positive make-happen attitude, to be able to handle multiple tasks, and be a team player.
  • Demonstrate the ability to self-improvement.

Work Environment
This job operates in both a professional office environment and a manufacturing/production environment. Commitment to safety is essential. This role routinely uses standard office equipment such as laptop computers, photocopiers, and smartphones.
Physical Demands
While performing the duties of this job, the employee is regularly required to talk or hear. Specific vision abilities required by this job include close vision and ability to adjust focus. This would require the ability to lift files, open filing cabinets and bend or stand on a stool as necessary.
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.
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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