Where Filter Structures Actually Get Installed

Industrial filter structures don’t operate in controlled environments. They go on rooftops, in open industrial yards, in exposed locations that experience the full range of environmental loading – heavy snow loads in winter, sustained wind pressure year-round, temperature cycling that affects material behaviour and connection integrity. In some installation locations, seismic loading is an additional design requirement that cannot be treated as a secondary consideration.

The structural calculations for equipment installed in these environments have to account for all of it. Not just the load case that is most straightforward to model, and not just the load case that produces the governing result under one set of assumptions. The full combination of loads that the structure will actually experience over its service life – including the combinations that arise from simultaneous wind and snow loading, from dynamic effects during maintenance and installation, and from the specific site conditions of each installation location – has to be evaluated and shown to be within acceptable limits.

This is structural engineering as it needs to be done for equipment that goes into the real world, as opposed to equipment that is designed to a single standard load case and then deployed into conditions that may or may not match that case. The difference between the two approaches is not visible in the finished product. It is visible in the performance of the structure over time, and in the absence of the failures that occur when the assumptions underlying the design don’t match the conditions the structure actually experiences.

How the Engagement Started and How It Grew

The engagement with this German industrial filtration manufacturer began in 2018 with CAD documentation work. The client needed engineering support for the documentation of their filter systems – assembly drawings, part drawings, and the structured documentation package that production and maintenance teams depend on. That is where the work started, and it was straightforward enough: take the existing design information, organise it properly, and produce documentation that could be used reliably by the people who needed to work with it.

What became apparent as the engagement developed was that the CAD documentation work was one part of a broader engineering picture. The client’s filter systems were going into an increasing range of installation environments, each with its own structural requirements. The question of whether a given filter configuration was structurally adequate for a specific installation location – with its specific wind and snow load requirements, its specific soil conditions, its specific seismic classification – needed to be answered on a project-by-project basis, with analysis that reflected the actual conditions rather than a conservative standard assumption applied uniformly.

The scope expanded to include structural analysis in Dlubal RFEM 5. And as the structural analysis work developed, the piping engineering dimension of the same projects became increasingly relevant. Filter systems require piping connections for the media they handle – air, water, and nitrogen in the case of this client’s products – and the design of those piping systems is not independent of the structural design or the CAD model of the equipment. The piping layout affects the loads on the structure. The structural geometry constrains the piping routing. The CAD model is the environment in which both are developed and coordinated.

Plant 3D was added to the scope for the piping design work, and by that point the engagement covered all three disciplines: CAD, structural analysis, and piping design. The same team handling all three.

Why One Team Across Three Disciplines Matters

The conventional model for multi-discipline engineering work is sequential or parallel handoffs between specialist teams. The structural engineer receives the CAD model and produces a structural calculation. The piping engineer receives the structural geometry and produces a piping layout. Changes in one discipline are communicated to the others through documentation – revision notices, updated drawings, handover packages – and the other teams update their work accordingly.

This model works, in the sense that it produces the required outputs. What it does not do efficiently is maintain the kind of integrated understanding of the system that allows decisions in one discipline to be made with full awareness of their implications for the others. When the engineer running the FEM calculations already knows the CAD model and the piping layout – because they are the same person or team that developed both – structural decisions are made with the full picture in mind. The question of how a structural modification affects the piping routing doesn’t require a formal communication to another team and a wait for their response. It is answered immediately, because the person making the structural decision already knows the answer.

This integration produces faster iteration cycles, fewer coordination errors, and a more coherent final design. It also produces better engineering, because the decisions being made at each stage are informed by the complete context of the system rather than by the partial picture available to a team working on a single discipline in isolation. The connections between structural behaviour, piping loads, and CAD geometry are not incidental – they are part of the engineering problem – and treating them as separate problems solved by separate teams introduces artificial boundaries that the real system doesn’t respect.

What Six Years of Engagement Produces

The engagement has been running continuously since 2018. New filter configurations, new installation environments, new load cases – each project is distinct, and each requires analysis that reflects its specific conditions rather than assumptions carried over from previous work. But the team doing that analysis already knows the product. They know how the structures are designed, how the connections work, what the typical failure modes are, and where the critical sensitivities lie in the structural behaviour.

That accumulated knowledge has practical value that compounds over time. The briefing required at the start of each new project is minimal, because the context doesn’t need to be rebuilt from scratch. The time between receiving a new project specification and producing useful analysis results is shorter than it would be for a team encountering the product for the first time. The quality of the analysis is higher, because the engineers doing it have seen enough variants of the same product to know what to look for and where the interesting questions are likely to arise.

It also produces a working relationship that functions differently from a series of discrete project engagements. The client’s engineering team can raise a question or flag a concern knowing that the response will come from someone who understands the full context without requiring extensive explanation. Technical decisions can be discussed and resolved quickly, because both parties have the shared vocabulary and shared reference points that develop through sustained collaboration on real projects.

The Structural Problem That Doesn’t Simplify

Industrial filter structures present a structural engineering challenge that doesn’t lend itself to simplified standard solutions. The installation environments are varied and often demanding. The load combinations are multiple and must be evaluated in combination rather than individually. The configurations change as the product line develops and new applications are identified. And the consequences of structural inadequacy in an outdoor industrial installation – a structure that performs poorly under wind load, that accumulates fatigue damage at connections, that doesn’t perform as intended under the snow load conditions of a specific site – are real and potentially serious.

Addressing that challenge properly requires structural analysis that is specific to each configuration and each installation environment – done by engineers who understand the product well enough to know what the relevant questions are, and who have the tools and the analytical capability to answer those questions with the rigour that the application requires. That is what the engagement with this client has been delivering since 2018, and what it continues to deliver as the product line evolves and the installation environments diversify.