I have a scenario I would like some input on. We have a property with five
buildings all five buildings are five stories tall with dry systems in the
attics. 4 inch schedule 10 main with Tyco attic heads on 1.25 inch sprigs. 4
of the buildings have all the main and sprigs in the attic with only the supply
and the drum drips in the heated floor below. Building five has the 4 inch
main hung in the hall way below with 10 foot sprigs penetrating the rated
ceiling into the attic. NO pitch on any of the main. I have not seen a dry
system done this way before but can not seem to find anything that says it cant
be done this way. (13-2002) Any input on this arrangement?
The issue I am having is the 4 inch pipe is developing pinhole leaks at only 18
months of service. Upon replacement of a section of pipe a sludge about 1 inch
thick was discovered as well as large amounts of water. I know the pitching
will correct the draining of the water but our concern was where the water was
coming from. The installing contractor told the customer "Idid you a favor to
keep your main from freezing." The question was asked if it was possible that
all the sprigs being in the cold area and the main in the dry could be the
cause for the excess water (condensation). Also is there any place I can send
a sample of the sludge to get it tested for possibility of MIC?
Thanks for the help.
Jeremy Blocker
EFPS
(303) 353-9712
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