Broad Vision Honest Service Great Value

Our goal then and now is to provide quality on time projects

Welcome to DeanGraff Gas Plant & petroleum engineering

Where We Build Your Visions

Our commitment to sustainability has never been more visible and I firmly believe that our new 23/25/30 targets are the correct ambition for the future of our company. While expertise enables delivery, partnerships ensure long-term success, which is why we align everything we do to our customers’ goals.

– Dean Graff

+1 424 226 7038



GERDOCK has completed hundreds of major mining and metals projects across six countries, enabling our customers to produce everything from aluminum to zinc.



DeanGraff has the resources and knowledge to undertake just about any job, with projects people, and offices.

Oil, Gas & Chemicals

For decades, customers have relied on our expertise to deliver global LNG capacity.


We well as receipt, inspection, and warehousing, materials, performing construction and field administration.

Mining & Metals

Our professionals are some of the most respected in the industry and possess expertise in complex areas of mining.


We as DeanGraff performs engineering, procurement, construction and project management on major infrastructure projects.


DeanGraff's team of tunneling specialists has been able to turn customers’ visionary concepts into reality.

Client Testimonials

DeanGraff is the world’s trusted infrastructure consulting firm, partnering with clients to solve the world’s most complex challenges and build legacies for generations to come.

For the past 20 years DeanGraff Gas Plant & Petroleum Engineering has been one of the most successful companies we have in our A/E/P client base. As their CPA and business consulting firm, we can attest to what a conservative management philosophy and attention to client service can result in: namely, consistent financial success from year-to-year and many satisfied, repeat clients.
Margaret Ericks​
Project Developer
DeanGraff's cost-effective designs are well detailed and lend to ease of construction, saving owners time and money.
Kent Schafer
Consulting & Inspection Services, LLC
The DeanGraff team has been an important part of success in a multitude of my projects throughout years. I have had the opportunity to work closely with DeanGraff on multiple modernization and new construction projects since 2002. DeanGraff and their team of engineers provide innovative solutions, work closely with the project team through the project development, approvals and construction.
Matthew Wilson​
Manager, EPC Functions
Over the past decade ESR has collaborated on challenging and unique design-build construction projects with DeanGraff's throughout the Bay Area. Their geotechnical expertise has been essential in providing cost-effective repair solutions for our clients. We look forward to working with DeanGraff's professional engineers and technicians as they continue to provide excellence in their industry
Bill Gibson
Engineered Soil Repairs, Inc.

sustainability at DeanGraff

Through DeanGraff’s 2030 sustainability target to use sustainable alternatives to reduce our environmental footprint on 100 percent of our key projects and non-project facilities, we are challenging ourselves to drive innovation and cost efficiencies in project development and delivery to bring greater value to customers.

Cycle Power Plant


Gas Production




Lng Racks


Waste Treatment


Fuel Storage



Dean Graff, is responsible for the management and oversight of DeanGraff’s global operations. A highly experienced leader who has managed major international FTSE 10 businesses, and has more than 20 years experience in the oil and gas, petrochemicals and minerals industry. Following early academic distinction, Dean Graff’s made important contributions to geochemistry, including groundbreaking methods for oil exploration and recovery. Also the Chief Executive Officer of DeanGraff Power Plant/Petroleum Engineering Group, Inc. Dean Graff first began working for a subsidiary company for decades before elevating his own company.

Dean Graff