Analysed.
Certified.
Nearly 30 years of specialist expertise across nuclear, oil & gas, pharmaceutical, power generation and energy. Rigorous, code-compliant engineering delivered to ASME, EN, PED and API standards.
Jonathan Saa — Principal Consultant
JIS Consultancy Limited is a specialist engineering consultancy founded and led solely by Jonathan Saa, a Senior Engineering Consultant with nearly thirty years of post-graduate expertise spanning a diverse portfolio of complex engineering projects. Based in Sutton Coldfield, UK, he has delivered rigorous, compliance-led solutions across the nuclear, oil & gas, pharmaceutical, power generation and energy sectors.
His technical repertoire encompasses regular application of international codes including ASME, EN, PED, ATEX, Machinery Directive and API. He has operated as Responsible Engineer, Technical Authority, Lead Consultant and Work Package Owner on some of the UK's most complex engineering programmes.
Jonathan has undertaken significant international assignments in Denmark, Slovenia, Sweden, Mozambique, Germany, Holland and Australia, combining computational rigour with practical engineering judgement at every stage.
“Every calculation, analysis, and design decision must be defensible — not just functional.”
What JIS Consultancy Delivers
JIS Consultancy Limited offers specialist engineering consultancy across six core disciplines, backed by three decades of cross-sector experience and deep knowledge of international codes and standards.
Pressure Vessel Design & Analysis
Design, analysis and compliance assessment of pressure-retaining equipment. API 579 fitness-for-service, Design-by-Analysis, data sheets and technical file compilation.
Pipework Stress Analysis
Static and dynamic analysis using Caesar II and AutoPipe. Full load cases including seismic, blast, wind, surge and thermal expansion across all major piping codes.
Finite Element Analysis
Structural, thermal and vibration FEA for pressure equipment and specialist components. Nonlinear, fatigue, local load and lifting analysis using Ansys and Staad Pro.
Regulatory Compliance
Full lifecycle PED/PER compliance from material appraisal through to technical file approval, CE marking, supplier audit and ISO 9001 implementation.
Pharmaceutical Engineering
Tank and vessel design to EN 13445 for GMP facilities. FAT/SAT supervision, surface anomaly investigation and Work Package Owner accountability.
CFD & Fluid Analysis
Computational fluid dynamics for flow analysis, burst behaviour, two-phase flow and valve characterisation using Fluent and FLO EFD.
Vessel Manufacturing & Quality Management
Under Jonathan Saa's technical leadership, JIS Consultancy has delivered over 300 pressure vessels to full PED compliance, spanning pharmaceutical, chemical, oil & gas and power generation — from design appraisal through to CE marking.
Black Residue Contamination: Root Cause Investigation & Resolution
During manufacture of stainless steel vessels to EN 13445 for a pharmaceutical facility, black residue contamination was identified at FAT. Jonathan led the root cause investigation and structured a multi-stage remediation programme that resolved all non-conformances without programme delay.
Root Cause
Embedded iron particles and surface oxides from grinding operations. Inadequate carbon steel tooling segregation introduced free iron into the stainless substrate, promoting black oxide formation and corrosion risk.
Compliance Risk
Contamination compromised corrosion resistance, violated GMP surface finish requirements and invalidated PED technical file acceptance. Vessels could not be released until EN 13445 and PER compliance was demonstrated.
Programme Outcome
All vessels remediated on schedule. Updated manufacturing controls and ITP hold points embedded into the supplier quality plan, preventing recurrence across the full programme.
Five-Stage Resolution Process
Mechanical Preparation
Affected areas reworked using dedicated stainless steel grinding discs and flap wheels, fully segregated from carbon steel tooling. Surface profiles verified to EN 13445 and client specification.
Chemical Passivation
Citric acid passivation applied to ASTM A967 / BS EN ISO 16048, restoring the passive chromium oxide layer and eliminating free iron. Verified by ferroxyl testing and surface inspection.
Hygiene Protocol Implementation
Full workshop hygiene audit, dedicated tooling registers, formalised cleaning procedures and area zoning enforced to prevent cross-contamination between carbon and stainless steel work.
Electrochemical Compliance (ECC) Verification
Electrochemical corrosion testing deployed to confirm passive layer integrity. Results documented as objective evidence within the PED technical file and FAT inspection records.
ITP Hold Point & Sign-Off
Formal hold point inserted at post-passivation stage for all subsequent vessels. Jonathan provided technical sign-off, closing the NCR and releasing vessels for hydrostatic test and CE marking.
Passivation & Surface Treatment
Citric and nitric acid passivation to ASTM A967, post-weld treatment and surface finish verification for pharmaceutical and hygienic-grade vessels.
Workshop Hygiene Management
Tooling segregation, dedicated SS work zones, cleaning protocol authorship and supplier audit against GMP and EN 13445 requirements.
ECC & Ferroxyl Testing
Electrochemical corrosion compliance testing and ferroxyl inspection as objective evidence of passive layer integrity within PED technical files.
Non-Conformance Management
Root cause analysis, corrective action planning, ITP hold point integration and formal NCR closure within ISO 9001 and PED quality frameworks.
FAT / SAT Supervision
Witness and sign-off of Factory and Site Acceptance Testing including dimensional, hydrostatic and surface inspection across large vessel programmes.
PED Technical File Compilation
End-to-end technical file management including design calculations, material traceability, weld records, NDE, hydrostatic test certificates and CE Declaration of Conformity.
Equipment & Plant
A selection of the pressure equipment, piping systems, process plant and analytical work delivered by JIS Consultancy across nuclear, pharmaceutical, oil & gas and power generation sectors.
Career Timeline
Thirty years of progressive engineering leadership across the UK's most demanding industrial programmes and internationally recognised clients.
Specialist engineering leadership for a major pharmaceutical plant upgrade, with accountability for all mechanical engineering personnel across Denmark and Slovenia.
- FEA for pressure-retaining components and structural assemblies
- Tank and vessel design to EN 13445
- API 579 fitness-for-purpose analysis
- FAT supervision and mechanical tank lifting design
- Supplier audit, selection and performance monitoring
- PER compliance assessments across all equipment categories
Function Owner for a defined zonal area within the Novo Nordisk plant upgrade. Managed tank upgrade design, FAT activities and piping oversight.
- FEA and steam impact forced velocity analysis on shell side walls
- EN 13480 pipework analysis review
- Pressure Vessel Data Sheets and equipment specification development
- Piping, valves and process equipment schedules
Three concurrent and sequential roles delivering specialist mechanical, structural and analytical engineering across nuclear, oil & gas and research sectors.
- Responsible Engineer at Sizewell B — ASME III, R3 EN13840, B31.1
- Missile impact, surge, seismic and wind calculations
- Staad Pro steelwork analysis to AISC ASD
- Vacuum chamber design to ASME VIII Div 2 (DBA)
- Vibration analysis using Ansys FEA
- CFD analysis of window burst behaviour
- Caesar II pipework stress analysis to ASME B31.3 and EN 13480
- Structural framework analysis — Staad Pro and Etabs
- Pressure vessel design to ASME VIII, PD 5500 and EN 13445
- 3D design of CHP, boiler and district heating installations
Senior technical role providing pipework stress analysis and regulatory compliance to major oil and gas clients including Shetland Gas Plant at Sullom Voe.
- Caesar II and AutoPipe analysis — ASME B31.3/B31.8 with PED 97/23/EC
- Final technical authorised signatory for GDF/Petrofac gas plant
- PED compliance — material appraisals, technical file reviews, module conformances
- Structural marine offshore review to DNV standards
- On-site technical authority at Eraring Power Station, Australia
- Pressurised economiser design with full CE approval — PED 97/23/EC
- R&D into ASME-designed unmanned submarine vessels
- Technical Authority for API 650/EN 14015 tanks — Grangemouth Refinery
- ASME III NC and B31.1 seismic analysis — Hunterston B Nuclear Power Station
- Lead Engineer for first-of-kind UK SCR plant — Ratcliffe Power Station
- EN 13480/EN 13445 analysis for Torness Nuclear Power Station
- PED 97/23/EC Safety Relief Valve design — ISO 9001 obtained via SGS
- Technical file approval via Lloyds Register to European Directives
- ASME/TEMA Shell & Tube Heat Exchanger design for Leeds University
- Analytical work at SASOL Petrochemical, Mozambique
- PED 97/23/EC implementation including type examination for both companies
- New product development: API Tanks, Detonation Flame Arrestors and Safety Relief Valves
- R&D and design of Reactor Filter Drier — DTI SMART Award funded
- Mechanical seal housings, agitators and pressure vessels to pharmaceutical standards
- Pharmaceutical Glove Box design for AstraZeneca
- Development of Gas Suspension Absorbers, Ceramic Filters and Fabric Filters
- Environmental air filtration design and performance analysis
Technical Expertise
A comprehensive technical toolkit built over three decades of high-stakes engineering across the most demanding industrial sectors.
Codes & Standards
Software Tools
Regulatory Frameworks
Sectors
Analysis Specialisms
Engineering Management
Engineering Design
Compliance and shell verification.
Technical Analysis
Forensic reporting and EDX support.
Regulatory Control
Engineering change control workflows.
Engage JIS Consultancy
All work is delivered personally by Jonathan Saa — you engage directly with the consultant.