Design basis & code selection
Definition of design conditions, materials, corrosion allowance, design life, loads, load cases, test conditions and the applicable code basis.
Lead capability · New design · DBR · DBA
Pressure vessel design & analysis
New-design, verification and modification support for pressure vessels and associated equipment—from transparent design-by-rule calculations through detailed design-by-analysis using finite element methods.
Pressure-equipment capability
From conventional code design to advanced assessment.
PRESMIDA Engineering supports manufacturers, fabricators, operators and engineering consultancies with defined pressure-equipment work packages. The method is matched to the geometry, loading and governing failure mode.
Design by rule
Code calculations for shells, heads, cones, openings, flanges, supports and pressure boundaries under internal or external pressure.
Design by analysis
Elastic and elastic-plastic FEA for complex geometries and loading beyond the practical limits of standard formulae.
Nozzles & local loads
Reinforcement, piping reactions, external forces and moments, large openings, local shell stresses and structural discontinuities.
Fatigue & cyclic service
Fatigue screening and detailed assessment for pressure cycles, thermal transients, welds, nozzles and local stress concentrations.
Buckling & stability
External pressure, vacuum, axial compression and combined-load assessment using code checks, eigenvalue or nonlinear analysis as appropriate.
Modifications & rerating
New or relocated nozzles, revised conditions, support changes, repairs, deviations, material substitutions and updated allowable limits.
Independent design review
Review of vendor calculations, PV Elite files, FEA reports, drawings, assumptions and design changes with documented comments and close-out.
New-design scope
Mechanical calculations built around the complete vessel.
Pressure boundary
Shells, dished heads, cones, transitions, flat ends, jackets, minimum thickness and maximum allowable pressure.
Openings & flanges
Nozzle reinforcement, manways, closely spaced openings, flange ratings, bolting, gasket seating and non-standard details.
Supports & attachments
Saddles, skirts, legs, base rings, anchors, lifting lugs, trunnions and local attachment loads.
Applied loading
Dead weight, contents, pressure, temperature, wind, defined seismic actions, piping reactions, transport, lifting and hydrotest cases.
Advanced analysis
DBA tied to the governing failure mode.
Detailed analysis is used where it resolves a real design question—not as a substitute for defining the design basis or understanding the load path.
Plastic collapse
Elastic stress categorisation, limit-load or elastic-plastic analysis to demonstrate adequate resistance to gross plastic deformation.
Local failure
Assessment of highly localised strain and stress conditions around openings, transitions, attachments and complex discontinuities.
Ratcheting & shakedown
Evaluation of repeated pressure and thermal loading where progressive deformation or cyclic plasticity may govern.
Fatigue
Stress-range extraction, cycle definition and cumulative usage assessment for pressure, mechanical and thermal transients.
Deliverables
A calculation package ready for technical review.
Design basis
Codes, conditions, materials, geometry, loads, assumptions, acceptance criteria and agreed design cases.
DBR calculations
Traceable code calculations and software output with governing results, utilisation and limitations identified.
DBA report
Model definition, mesh, boundary conditions, verification evidence, results and failure-mode-specific assessment.
Engineering conclusions
Clear design status, required changes, outstanding inputs and actions for manufacture, review or further assessment.
Useful project inputs
- Process or mechanical datasheet
- Design and operating pressure and temperature
- Dimensions, drawings and nozzle schedule
- Materials, corrosion allowance and design life
- Piping, support and environmental loads
- Cycle definition and thermal-transient information
- Applicable code, client specification and review requirements
Defined professional scope
- Engineering design, calculation and analysis support
- Independent review and drawing support where agreed
- Manufacturer retains conformity-assessment responsibility
- Approved Body involvement arranged by the manufacturer
- No statutory PSSR examination service is claimed
- Specialist inspection and certification coordinated separately
Start with the design basis
What pressure equipment needs to be designed or verified?
Share the code basis, design conditions, geometry, materials, loads and the calculation or review deliverable your project requires.
enquiries@presmida.com