About MechNex

Independent. Specialist.
Code-Fluent.

MechNex is a mechanical engineering consultancy built around deep expertise in pressure equipment. We are not a generalist firm that happens to do work in this area, but a team built specifically to deliver this work at a high level.

We work with engineering contractors, EPCs, owner-operators, and OEMs across the process, energy, and industrial sectors. Clients come to us when the equipment is complex, the code requirements are strict, or internal capacity isn’t there, and the work needs to be done properly the first time.

The consultancy was built on a straightforward premise: pressure equipment design is a narrow discipline that rewards specialisation. Code knowledge, FEA methodology, and the judgement to know when a standard procedure applies and when it doesn't — these take years to develop and can't be replicated by general mechanical engineering alone.

We operate as an independent firm. Our analysis is not influenced by fabrication or procurement interests. When we issue a calculation package, it reflects the engineering as we assess it.

How We Work

Engagements run from single-item calculations to multi-discipline packages covering pressure design, FEA, nozzle load evaluation, flange integrity, and pipe stress, delivered with full documentation to client or regulatory requirements.

We work to tight schedules and communicate directly with the engineers making the decisions.

Request a Quote Our Services
  • 45+ years of combined experience in pressure equipment engineering
  • Senior engineers involved directly in all project work
  • Typical response within one business day
How We Approach the Work

What We Stand Behind

01
Code as a Floor, Not a Ceiling
We use ASME, EN 13445, CODAP, and the rest as minimum standards, not as substitutes for engineering judgement. When a code procedure doesn't fully capture the loading condition or geometry, we say so and apply the right method — whether that's FEA, WRC analysis, or an alternative code route.
02
Documentation That Survives Review
Calculation packages are written to be followed by someone who wasn't in the room — clear assumptions, traceable inputs, referenced code clauses, and conclusions that don't require a phone call to understand. This matters when the package goes to a notified body, a client engineering team, or an insurer.
03
Independent of Fabrication Interests
We don't fabricate, supply, or procure equipment. Our analysis reflects the engineering as we assess it. That independence is worth something — especially when the question is whether a design as-built meets the code, or whether a repair is adequate.
04
Responsive Under Schedule Pressure
Shutdown scopes, late design changes, and tight AFC deadlines are normal in this industry. We plan for schedule pressure from the start, communicate directly with the project team, and don't disappear when the timeline gets difficult.
The Team

The People Behind the Projects

The core team is involved in all project work. Where needed, capacity is extended through a dedicated group of engineers, aligned with the technical requirements of the project.

Milos Dejanovic
Milos Dejanovic
Mechanical Engineer  ·  20+ years

Pressure equipment specialist across multiple industries, focused on non-standard problems. Thermomechanical FEA, piping stress, and flange integrity under demanding service conditions.

  • Code Calculations
  • Mechanical & Thermomechanical FEA
  • Piping Stress Analysis
  • Flange Design & Leakage Prevention
milos.dejanovic@mech-nex.com LinkedIn
Ivan Tot
Ivan Tot
Mechanical Engineer  ·  15+ years

Covers air-cooled heat exchangers, code calculations, FEA, and steel structures. Leads projects end to end, ensuring clear scope, direct communication, and reliable delivery across the full project lifecycle.

  • Air Coolers (API 661)
  • Code Calculations
  • Steel Structures & Frames
  • Pressure Vessels & Heat Exchangers
ivan.tot@mech-nex.com LinkedIn
Boris Vukić
Boris Vukic
Mechanical Engineer  ·  10+ years

Focused on pressure vessels and heat exchangers, with strength in advanced FEA — thermomechanical, fatigue, and nozzle loads — supported by clear, fabrication-ready documentation.

  • Pressure Vessels & Heat Exchangers
  • Nozzle Load Evaluation
  • Fatigue & Cyclic Loading
  • Drafting & Fabrication Documentation
boris.vukic@mech-nex.com LinkedIn