When Quality Standards Evolve: A thyssenkrupp Elevator Project That Changed My Approach

It was a Tuesday morning in late March 2024 when the project landed on my desk. I’m a quality compliance manager at thyssenkrupp—I review every elevator system before it reaches customers, roughly 200 unique items annually. I’ve rejected 12% of first deliveries in 2024 due to spec deviations, and this one smelled like trouble.

The job came from a major commercial developer: a 12-story office tower in Chicago. They wanted two high-speed panoramic elevators with tempered glass walls. The glass would be sourced from a supplier we’d used before, but the spec sheet looked off. I measured the thickness against our internal standard—5mm tolerance was printed as “±0.5mm.” But the supplier’s test report showed ±0.8mm across every panel.

Here’s the thing: that might seem minor. But for a glass panel that holds people 100 feet in the air, 0.3mm matters more than most think. I called the supplier, and they said, “It’s within industry standard.” I asked which standard. They mumbled something about ASTM E1300. I pulled up the current ASTM document—it allowed ±0.8mm for that thickness. So technically, they were right.

But I kept asking myself: Is “industry standard” enough when our brand is on the line? The upside was saving two weeks and $18,000 in reorders. The risk was that the glass could fail under certain thermal loads. I calculated the worst case: a lawsuit, a reputation hit, maybe even injuries. The expected value said go ahead—the probability of failure was low. But the downside felt catastrophic. So I rejected the batch.

Even after making that call, I second-guessed. What if I was being too rigid? The two weeks until the replacement arrived were stressful. I’d told the project manager we’d delay the schedule. (Should mention: we had a 3-day buffer built in; we ended up using it.) On top of that, the client sent over two other concerns: their Genie garage door openers in the parking garage were acting up, and they wanted advice on cleaning baseboard heaters in the lobby.

Look, I’m an elevator quality guy. Garage doors and heating vents aren’t my job. But at thyssenkrupp, we also do marine systems (tkms)—I reached out to a colleague in that division. He told me that in marine environments, tempered glass specs had tightened globally after a 2022 incident. He sent me the internal thyssenkrupp marine systems press release from June 2023 announcing new tolerance requirements. That press release made me realize: our own elevator division hadn’t updated its standard in five years. We were still using 2020 best practices. The industry had evolved.

I called the supplier back, explained the new context, and asked them to meet our tighter spec. They agreed after some negotiation. Meanwhile, I helped the client with the Genie opener issue—turns out it was a sensor alignment problem, which I remembered from a past project. And for the baseboard heaters, I pointed them to a simple cleaning routine using a vacuum and a soft brush. (Oh, and I later learned that a proper maintenance schedule can reduce heating costs by 15%.)

Dodged a bullet on the glass, to be honest. The replacement batch arrived within spec, and the elevator installation went smoothly. The client was satisfied—they even asked for a second quote on marine system components for their next project. The best part: no one got hurt, and our brand stayed intact.

What I took away from that project: the fundamentals haven’t changed—safety, consistency, trust. But the execution has transformed. Five years ago, ±0.8mm was acceptable. Now it’s not, at least for us. I updated our internal spec document in Q2 2024, making the tolerance stricter and adding a note to cross-reference with marine standards. Every contract now includes those requirements.

Simple. Done.