Choosing a Service Format That Actually Fits

When you need a structural audit for a large industrial crane, the first question is not about price. It is about format. Do you need a full on-site inspection with real-time data collection, or can the analysis be done remotely using existing drawings and load histories? The answer depends on the crane's age, the operating environment, and the level of detail required for the fatigue assessment.

For a 120-ton overhead crane in a steel plant, the format often starts with a document review. We ask for the original design calculations, weld maps, and maintenance logs. If those are incomplete, the next step is a site visit to measure actual geometry and collect strain data under controlled loads. That is the difference between a desktop study and a field audit. Both are valid, but they answer different questions.

A remote analysis works well when the structure is relatively new and the load spectrum is well documented. It is faster and avoids production downtime. But if the crane has been in service for more than 15 years, or if there are visible signs of wear like cracks in the girder welds, a field audit becomes necessary. The on-site team can perform ultrasonic thickness measurements, dye penetrant testing on critical joints, and install temporary strain gauges to capture real load cycles.

The tradeoff is straightforward: remote analysis gives you a probabilistic fatigue life estimate based on assumed loads; a field audit gives you actual stress ranges and a much tighter confidence interval. For a crane that handles molten metal or other critical loads, the field audit is the only responsible choice.

Another factor is the format of the final report. Some clients want a single PDF with conclusions and recommendations. Others need a full finite element model that they can run internally for future load scenarios. We can deliver either, but the scope changes. A static MEF model with a few load cases takes about two weeks. A dynamic model with thermal coupling and crack propagation simulation can take six weeks. The format of the deliverable should match the decision you need to make.

If you are unsure which format fits your situation, start with a preliminary consultation. We review the available documentation, discuss the operating conditions, and recommend a scope that matches the risk level. That conversation is free and takes about an hour. After that, you will know exactly what to expect.