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A client's comment about my pipe sizing method made me rethink it | Commercial Plumbing - Hub Chatter

A client's comment about my pipe sizing method made me rethink it

I was running the numbers for a new restaurant in Austin, using my usual method for sizing the main water line. The owner, who used to be an engineer, looked it over and said, 'Your peak flow estimate is too low, you're not counting the three industrial ice machines running at the same time.' He was right, I was just using a standard table. I redid the math with his specific equipment schedule and had to go up a full pipe size. Has anyone else had a client catch a detail you missed on a plan review?

3 comments

3 Comments

gray_walker495mo ago

Read an article last year about this exact thing happening with a hospital retrofit. The engineer used old fixture counts and missed a whole new wing with extra labs. Client caught it during the value engineering phase. It's a good reminder that standard tables are just a starting point. You really have to dig into the specific equipment list every single time, even if it takes longer. That owner doing a deep dive on his own ice machines saved a lot of future headache.

henryreed5mo ago

Man, that reminds me of a friend's restaurant reno. The plans had a standard sink and dishwasher load for the size, but they added a huge pastry station last minute. Nobody updated the hot water heater size. Opening week, they'd run out of hot water halfway through dinner prep! Had to get an emergency plumber to swap in a bigger unit. It's crazy how one small change can throw the whole system off.

wadea535mo ago

Wait, isn't value engineering usually about cutting costs, not adding things? I thought that phase was for finding cheaper ways to meet the specs, not for catching missing loads. Maybe the article @gray_walker49 read meant the design development phase? It's a key difference because by the time you get to VE, the big equipment is often already set. Catching it then is lucky, but it's way better to nail the equipment list early. That hospital story just shows how easy it is for a project's scope to slip past everyone if you're not constantly checking.