PGR Doherty-Bigara (Pat)

PGR Doherty-Bigara (Pat)

PGR Doherty-Bigara (Pat)

Professional Engineering Design & Certification Support

Independent Certifications
& Approvals

Professional Engineering Design & Certification Support

Mechanical & Structural Engineer specialising in Pressure equipment and structural sign-off.
Mechanical & Structural Engineer specialising in Pressure equipment and structural sign-off.
Practical mechanical and structural engineering support for small and large projects, including design assistance, engineering calculations, verification, compliance documentation, and certification support.

Contact Pat to discuss your project and request a quotation.
Practical mechanical and structural engineering support for small and large projects, including design assistance, engineering calculations, verification, compliance documentation, and certification support.

Contact Pat to discuss your project and request a quotation.
Request a Quote

  • Pressure Equipment Certification

  • Mechanical Design Verification

  • Structural Sign-off

  • Professional Engineering Design & Certification Support

  • Compliance Reports (AS/NZS)

  • Pressure Equipment Certification

  • Mechanical Design Verification

  • Structural Sign-off

  • Professional Engineering Design & Certification Support

  • Compliance Reports (AS/NZS)

  • Pressure Equipment Certification

  • Mechanical Design Verification

  • Structural Sign-off

  • Professional Engineering Design & Certification Support

  • Compliance Reports (AS/NZS)

Mechanical $ Structural Engineer specialising in Pressure equipment and structural sign-off.
By Chartered Professional Mechanical and Structural engineer specialising in many areas such as Material Handling, Calculations, Machines Design, Computer-Aid Design, hazardous equipment’s cranes, pressure vessels etc. and sign-off.
Request Certification

About Pat

About Pat

Chartered Professional Mechanical & Structural Engineer with 25+ years’ experience across design, certification, and project management. Pat has held senior leadership roles and delivered major projects for power generation, mining, steel, and infrastructure industries. His expertise spans pressure equipment, structural design, compliance documentation, and quality assurance — providing clients with fast, reliable, and fully compliant certifications.
Contact Pat

01.

Certification

Independent certification for pressure equipment and structural work to relevant AS/NZS standards, so projects can proceed without delay.

03.

Experience

Backed by professional qualifications and years of mechanical & structural engineering expertise.

02.

Documentation

Clear, audit-ready compliance reports and QA/HSE documentation aligned to ISO 9001 / PMBOK, written for regulators and site teams.

02.

Documentation

Clear, audit-ready compliance reports and QA/HSE documentation aligned to ISO 9001 / PMBOK, written for regulators and site teams.

04.

Verification

Mechanical & structural design verification with calculations and FEA/stress analysis (SolidWorks, SpaceGass) to confirm compliance and safety.

Payment details will be provided upon acceptance of a quotation or issue of an invoice.

Send through your drawings, project details, or even a quick outline of the job.

Patrice will review and guide you on the exact steps needed for certification, approval, or compliance.

Payment details will be provided upon acceptance of a quotation or issue of an invoice.

Send through your drawings, project details, or even a quick outline of the job.

Patrice will review and guide you on the exact steps needed for certification, approval, or compliance.

Payment details will be provided upon acceptance of a quotation or issue of an invoice.

Send through your drawings, project details, or even a quick outline of the job.

Patrice will review and guide you on the exact steps needed for certification, approval, or compliance.

Independent engineer with decades of experience. Fast, clear certifications to keep your project moving

Independent engineer with decades of experience. Fast, clear certifications to keep your project moving

Independent engineer with decades of experience. Fast, clear certifications to keep your project moving

Qualifications

PhD in Structural Engineering (2020)

Master’s in Engineering Management – SCU (2017)

BEng Mechanical – VUT (1988)

Chartered Professional Engineer (CPEng, MIEAust, RPEQ 27808)

FIEAust, APEC Engineer, IntPE (Aus)

Qualifications

PhD in Structural Engineering (2020)

Master’s in Engineering Management – SCU (2017)

BEng Mechanical – VUT (1988)

Chartered Professional Engineer (CPEng, MIEAust, RPEQ 27808)

FIEAust, APEC Engineer, IntPE (Aus)

Experience

25+ years in Mechanical & Structural Engineering

Senior leadership roles in major engineering firms

BlueScope Steel: Reliability projects & plant extensions

Seven Group: Directed design team for global equipment releases

Eneraque: Delivered $2M–$100M turnkey projects + patents

Experience

25+ years in Mechanical & Structural Engineering

Senior leadership roles in major engineering firms

BlueScope Steel: Reliability projects & plant extensions

Seven Group: Directed design team for global equipment releases

Eneraque: Delivered $2M–$100M turnkey projects + patents

Expertise

Pressure Equipment Certification & Compliance

Structural Sign-off & Mechanical Verification

CAD, SolidWorks & Finite Element Analysis (FEA)

ISO 9001, QA, HSE & Risk Management

Project Management (PMBOK) & Documentation

Expertise

Pressure Equipment Certification & Compliance

Structural Sign-off & Mechanical Verification

CAD, SolidWorks & Finite Element Analysis (FEA)

ISO 9001, QA, HSE & Risk Management

Project Management (PMBOK) & Documentation