Pressure Vessel Engineering.
ASME Certified & PE Stamped.
Complete independent certification for heavy cylindrical shells, process towers, reactors, and heat exchangers. We provide mandatory PE stamping for User’s Design Specifications (UDS) and Manufacturer’s Data Reports (MDR) backed by ASME Part 5 FEA Design-By-Analysis.
Pressure Equipment Compliance Accepted by Major Operators & EPCs
Interactive Pressure Vessel Simulator & Div 2 Savings Engine
Drag the parameter bars below left and right. The CAD vessel cross-section updates its geometry, stress color profile, and wall thickness live, calculating real-time ASME Section VIII Division 1 vs Division 2 Class 2 steel savings.
Vessel Input Parameters
Slide Left / Right ⇄Real-Time Code Metric Outputs
Div 2 Class 2 vs Div 1Pressure Equipment Engineering Portfolio
Real-world pressure equipment certified to ASME Section VIII Division 2. Below are our core structural configurations—from heavy wall columns with vortex mitigation to Part 5 FEA stress linearization contours.
High-Pressure Hydrotreater Vessel
ASME Section VIII Div. 2 Class 2 design, heavy wall rolling, Cat A/B full radiography (RT-1), and post-weld heat treatment (PWHT) cycle stamping.
Spherical Gas Storage Vessel
Membrane stress minimization, column support leg attachment calculations per Part 4.15, and seismic sloshing response under ASCE 7-16.
Tall Process Column & Skirt Transition
Combined loading calculations (internal pressure + dead weight + wind overturning + seismic moments) plus skirt base ring and anchor bolt design per ASME Section VIII Div 2.
Nozzle-to-Shell Stress Linearization
Part 5.2.3 elastic-plastic analysis, protection against plastic collapse, and cyclic fatigue screening per Annex 5-A rainflow count.
Pressure Vessel Code Compliance & Advanced Mechanics
From independent certification under Annex 2-A to complex non-linear finite element simulations, Complimark acts as your dedicated code compliance authority.
User’s Design Specification (UDS) PE Stamping
Under ASME Section VIII Div 2, the User’s Design Specification MUST be certified by an independent licensed Professional Engineer (PE). We formulate and audit operational cycle envelopes, seismic/wind loadings, and transient cases.
- Annex 2-A compliance review
- Cyclic & transient load profiling
- US / Canadian / Global PE seals
Manufacturer’s Design Report (MDR) Sign-Off
Fabricator design documentation must be verified against the certified UDS. We provide authoritative PE review and stamping of the Manufacturer’s Design Report, including Part 4 Design-by-Rule (DBR) calculations.
- Class 1 and Class 2 verification
- Complete DBR calculations audit
- Fabrication tolerance sign-off
Elastic-Plastic & Limit Load FEA
When vessel geometries, large openings, or external piping moments exceed Part 4 standard formulas, our FEA specialists perform non-linear elastic-plastic analysis to demonstrate protection against plastic collapse.
- Protection against local failure
- Stress linearization & paths
- Buckling & external pressure collapse
Thermal Fatigue & Creep Screening
Evaluation of cyclic thermal transients, rapid start-up/shutdown sequences, and high-temperature creep damage per ASME Section VIII Div 2 Part 5.5 and API 579 / ASME FFS-1 Fitness-For-Service standards.
- Screening criteria Method A & B
- Rainflow cycle counting assessment
- High & low cycle fatigue curves
Authorized Inspector (AI) Audit Clearance
Pre-audit mock audits and direct technical defense alongside your quality assurance team. We liaison directly with Authorized Inspection Agencies (AIA) such as Hartford Steam Boiler, Lloyd's Register, and Bureau Veritas.
- Traveler & inspection point review
- WPS / PQR & NDT procedure audit
- ASME Joint Review support
Our 4-Phase Route to Final PE Stamped Dossier
Standardized pressure vessel compliance pipeline engineered to prevent revision loops and deliver audit-proof certification on schedule.
Frequently Answered Pressure Vessel Compliance Questions
Key regulatory and engineering clarifications for vessel fabricators, package engineers, and EPC contractors.
Ready to Certify Your Next Pressure Vessel?
Connect directly with our licensed Professional Engineers. Avoid costly fabricator delays, eliminate AI audit pushbacks, and reduce raw steel weight through compliant Division 2 engineering.
Fast-Track Review Request
Submissions forward directly to info@complimark.com and open your mail client with prefilled technical parameters.