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A boiler feed pump blew a seal on me at the old power plant in Joliet, and I've argued about the right fix ever since.
We were doing a full shutdown on Unit 3, and I was checking the feed pump alignment. Everything looked good, but when we fired it back up, the high-pressure seal on the discharge side just let go. Hot water and steam shot everywhere, and we had to shut down again for a full day. The foreman said we should have replaced all the seals as a set, not just the one that looked worn. I argued that the other seals passed the pressure test and visual check, so why waste the time and money? That one failure cost us more in downtime than a full seal kit would have. It changed how I look at preventive maintenance. Now I'm torn between trusting my checks and just swapping everything out to be safe. What's your take on replacing parts that test okay versus a full kit change during a shutdown?
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lilyb275mo ago
That kind of failure is exactly why my shop moved to a hard rule on full seal kits for any pump rebuild. We learned the same lesson the hard way. Testing only shows the condition at that exact moment, not how it will handle the stress cycles after startup. The cost of the extra seals is just parts inventory, but the cost of a second shutdown comes straight out of production. It feels like a waste to pull good parts, but it's cheaper than betting your schedule on them.
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victor_davis175mo ago
Man, that hits home. A buddy of mine in a plant tried to save time on a compressor rebuild by reusing the valve plates that looked fine. They passed all the bench tests, just like @lilyb27 said. Thing ran for maybe six hours before one cracked under load and took out a whole lot more. The unplanned outage cost them three days of lost production, which absolutely buried the savings on parts. Now his whole crew has the same rule, replace all the soft parts every single time. It really is just cheaper to do it right once.
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