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 practice led solely by Jonathan Saa — a Senior Engineering Consultant with 30+ years of post-graduate experience delivering compliance-led solutions across nuclear, oil & gas, pharmaceutical, power generation and energy sectors.
Jonathan has held roles as Responsible Engineer, Technical Authority and Lead Consultant on major UK programmes, applying codes including ASME, EN 13445, PED, ATEX and API. His project work spans eight countries, 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 & Flow Analysis
Computational fluid dynamics for internal and external flow, two-phase analysis, window burst behaviour and thermal modelling 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.
Technical Expertise
A comprehensive technical toolkit built over three decades of high-stakes engineering. Select a category to explore, or search within any area.
Combined pressure + weight load case on a multi-branch manifold at 20.0 MPa internal pressure. Solid hexahedral mesh highlights stress concentration at branch-header welds, elbow/valve body peaks and stress gradient through the manifold wall. Bolt pre-load simulation at blind flange termination included.
Pressure vessel under 15.0 MPa internal load — longitudinal cut plane reveals stress gradient through head thickness and high stress concentration at the nozzle junction. Solid finite element mesh with fixed support boundary conditions applied at saddle locations.
Representative outputs only. Actual deliverables are provided under formal engineering sign-off and covered by professional indemnity insurance.
Organisation
JIS Consultancy operates as a lean, specialist engineering practice — structured for agility, accountability, and direct senior-engineer engagement on every project.
Practice Structure
Sole technical authority & client point of contact on all engagements.
- › Independent practice — no sub-contracting of technical work
- › Direct senior-engineer delivery on every project
- › Available for UK, EU and international engagements
- › On-site, hybrid or fully remote working
- › Day rate, fixed-fee and retainer arrangements available
- › ISO 9001 Lead Auditor certified
- › Full professional indemnity insurance
- › Deliverables issued under formal engineering sign-off
- › Confidentiality agreements standard on all projects
Sectors Served
Why Clients Choose JIS
Client Portfolio
A 30-year record of delivery for globally recognised organisations across nuclear, oil & gas, pharmaceutical, power generation and petrochemical sectors.
FEA for pressure-retaining components, EN 13445 vessel design, API 579 fitness-for-purpose, FAT supervision and PER compliance across pharmaceutical plant upgrade.
Function Owner for Novo Nordisk plant upgrade — FEA, EN 13480 pipework review, pressure vessel data sheets and equipment specifications.
Responsible Engineer — ASME III, R3 EN13840, B31.1. Missile impact, surge, seismic and wind calculations; structural steelwork to AISC ASD.
Vacuum chamber design to ASME VIII Div 2 (DBA), vibration analysis via Ansys FEA, and CFD analysis of window burst behaviour.
Final technical authorised signatory. Caesar II / AutoPipe to ASME B31.3/B31.8 with PED 97/23/EC; structural marine offshore review to DNV.
On-site technical authority. Pressurised economiser design with full CE approval to PED 97/23/EC.
Technical Authority for API 650 and EN 14015 storage tanks.
ASME III NC and B31.1 seismic analysis for nuclear plant systems.
Lead Engineer for first-of-kind UK SCR plant design and delivery.
EN 13480 and EN 13445 analysis for nuclear plant systems.
Analytical engineering and PED 97/23/EC compliance for petrochemical plant equipment.
ASME/TEMA Shell & Tube Heat Exchanger design and technical file approval via Lloyds Register.
Pharmaceutical Glove Box design and specialist pressure vessel engineering to pharmaceutical standards.
PED 97/23/EC implementation and type examination. New product development: API Tanks, Detonation Flame Arrestors and Safety Relief Valves.
Calculators
Interactive engineering calculators built on the same codes and standards used in JIS Consultancy project work.
Disclaimer: Results are consistent with PED 2014/68/EU Annex II classification rules and are provided for preliminary guidance only. They do not replace formal engineering review or Notified Body assessment. Equipment meeting Article 4(3) must be designed to sound engineering practice (SEP) but must not bear the CE marking.
Disclaimer: Results are for preliminary guidance only and do not replace formal engineering review or code-qualified calculations. Design stress f must be taken from EN 13445-3 Annex B material tables at design temperature.
Engage JIS Consultancy
All work is delivered personally by Jonathan Saa — you engage directly with the consultant.