I have a project with a typical compressed air dry sprinkler system in an unconditioned attic space (site is at 44 deg latitude). The system is 22 years old.
Site maintenance person reports that they've had issues with this system for at least 15 years. Frequent and repeated leaks, predominately pin holes in the mains. They try to repair before the system gets wet, although not always in time.
They recently replaced a 3 inch main and found that it was about 30% filled with sludge. Sludge was dark brown, almost clay like, sludge.
Any thoughts on how such a large volume of sludge can accumulate in a dry system?
Thanks in advance.
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