Shoutout to the old boiler manual that taught me something new

I was flipping through a 1970s manual for a power plant boiler and saw the original hydrostatic test pressure was 50% higher than today's standard. Found it in a box of old papers at a plant in Gary, Indiana. Anyone else run into specs that seem crazy by modern rules?

2 comments

2 Comments

charlesj461mo ago

Seen this in old houses too, like knob and tube wiring that somehow lasted a century. Standards just used to be way more overbuilt, less precise. Makes you question what we consider safe now.

rowank691mo ago

I mean, it makes you wonder if the old safety factors were just that much bigger, or if we've learned more about metal fatigue over time. Maybe they were building for a different kind of stress back then, like more frequent pressure swings. Idk, it's wild to think the same piece of steel was meant to handle that much more.