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richardvestal (Mechanical)
7 Nov 07 17:41
Would be interested in opinions, reference information and experiences regarding service life of schedule 40 black iron pipe in 180F heating water systems.
IRstuff (Aerospace)
7 Nov 07 19:17
Is that like the crap in my father's house which dates back to 1926? If so, then it's on the order of about 20-30 yrs. TTFN
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GMcD (Mechanical)
7 Nov 07 19:24
If it's been chemically treated properly, flushed and cleaned on initial fill, and the system is flushed and cleaned every few years, and the pipe velocities are below 8 feet per second on the big pipes and less than 6 feet per second on the smaller pipes, then one should expect at least 75 years of useful service life, and even longer. I've seen heating pipe that came out of a 1910 vintage building here that we did renovations on, and it was till in service and working fine.
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TBP (Mechanical)
7 Nov 07 21:27
What there absolutely MUST NOT be, is any amount of make-up water. If the system is kept tight, and essentially leak free, then it should last indefinately. If you're talking about a relatively small (residential) hot water heating system, then water treatment is typically not needed.
RossABQ (Mechanical)
7 Nov 07 23:58
ASHRAE has a table that lists "average" service life of common components like boilers and chillers, not sure about systems. Lots of variables...
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