Sometimes being in the right place at the right time exposes you to uncommon experiences. Working for a trillion dollar company also gives you access to lawyers and resources few have readily available through just a phone call.
A forensic study is what you buy when nobody can explain what happened and everyone has stopped guessing. It is expensive, slow, and it means the question is now worth more than the equipment.
An Apple store in Chicago cooled itself with the Chicago River. Inside two years, two of the machines that made the cold were dead. Not limping. Shut down.
This type of thing doesn’t happen often so I hired an outside firm cut out the block of metal plates where the river water and the building’s water pass each other to figure out what went wrong.
A rock, or something close enough, had punched a hole clean through one of those plates. River water poured through into the parts that do the cooling and destroyed them.
There was no filter on the intake. The river was invited in, and nobody asked what it was carrying.
The easy and short version of this story is that somebody was careless. The design was good. Borrowing the cold already in a river and handing the heat back on the way out is elegant engineering, and the people who drew it were not fools, but details were missed.
Which is exactly what makes it worth an email.
The Reality:
The system did not fail. It did precisely what a system missing a detail does when you connect it to a river. It performed to specification. The specification was incomplete.
And the omission was not made in Chicago. It was made on paper, long before any water moved, in the gap between two people’s work.
Every building has edges, places where the outside stops and the building begins. City water. Outside air. Storm water that has to go somewhere. Electrical service from a grid you do not control. A well, a lake, a river, the ground.
At every one of those edges is a component whose only job is to keep out what you did not order. A screen. A strainer. A filter. A trap. A backflow preventer. Surge protection.
These are the cheapest parts in the system. Every one. And they get value engineered out of a budget, deferred out of a schedule, left off a drawing, or installed once and never serviced again, because nothing appears to happen when they are missing.
Nothing appears to happen right up until a rock arrives.
Here is why they go missing more than any other component, and it is not carelessness.
They live on a boundary, where one scope of work ends and the next begins. Every specification is written from inside somebody’s scope looking out, and the piece sitting on the line between two scopes belongs, in writing, to neither. There is rarely a sentence in a project that says and also, the part between us.
So the protective component is owned by nobody. And a component nobody owns does not get designed, installed, inspected, or maintained. Four failures from one missing sentence.
The requirement was not hiding. ASHRAE’s handbook is explicit that systems drawing from natural water need attention to filtering sediment, even completely disconnecting the two systems.
Nobody reads those after the crane leaves. They go into a binder, the binder goes into a closet, and the closet gets painted.
What the missing filter cost was not a filter. It was two machines, an investigation, and every hour spent answering a question a screen would have prevented.
It is expensive to be prepared. It is more expensive to find out you weren’t.
And I know what you might be thinking. “Wasn’t the guy writing this in charge of engineering for Apple?” I was, but with projects spread around the globe we relied on our chosen professionals to protect us.
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The boundary audit.
This is the exercise I would run on any building I owned. A legal pad and about two hours.
Start by listing every way the outside gets into your building. Not systems. Entries.
City water supply. Outside air intakes. Storm drainage and any sump. Electrical and gas service. Any system drawing from a natural source. Cooling towers, open to the sky by design and drinking whatever falls in. And the one everybody forgets, the fresh-air side of your ventilation, pulling street air through a filter somebody is supposed to change.
Now, for each entry, three questions.
What is between the outside and this equipment? Name the actual part. If you cannot name it, that is your answer, and you can stop the audit and go find out.
Who checks it, and when did they last? Not who is responsible in principle. Who did it, on what date, and where is it written down. A protective component with no service record is one nobody has looked at since installation.
And the third, which prices the part: what happens to this equipment if that thing is not there?
That third question turns a forty dollar screen into a line item you will defend. A strainer standing between a river and the machines that cool your building is the cheapest insurance in the property, and you can say so to a contractor who wants to trim the bid.
One more thing while you have the pad out.
Get the operations manual for your most expensive piece of equipment and find the page saying what has to be installed ahead of it. That page is a contract nobody read. Compare it against what is there. I have never once seen that comparison come back clean.
If the binder is gone, which is normal, this still takes an afternoon. Walk to the equipment and photograph the nameplate. Make and model are stamped on it. Manufacturers publish manuals for equipment decades old, free. Download the one matching your model, find the installation requirements, and read only that section. You are not learning the machine. You are looking for one list of things supposed to be upstream of it.
Then go see whether they are there. That converts a building you inherited into one you know something about, for the price of a walk and a search.
The bottom line.
The parts that protect a system are never the parts anybody argues about. They are too cheap to be worth a meeting, which is precisely how they end up owned by nobody.
Everything in that store was engineered except the part that keeps the river out. Not because the engineering was bad, but because that part was on a line, and lines have no owners unless somebody assigns one.
Reviewing an equipment list is easy, and the list will look fine. What you are learning to read is the seams between the lists, because that is where the expensive surprises are kept.
—Jon
P.S. This is the kind of thing I am looking at when a loan I make is secured by a building. Not the pro forma. The seams. If you want to see how that reads from the investor side, reply “lending” and I will walk you through it.