Just a note of caution here.
I have seen several dry-pipe fire systems that leak drips of oil from the
pipe joins in collections areas as diverse as textiles and archives. This is most
likely the oil used to cut the metal threading into the pipes and it is comes
out (sometimes along with rust in solution). If you are putting in a new
system you should specifically spec in the contract that all machine oil will be
totally removed before assembly and have the pipes inspected to verify this.
If you have an existing dry-pipe system you should inspect all of the pipes
that run over ALL areas that contain exhibits and collections regularly, as the
oil tends to leave a drip hanging on the pipe joins and can be easily spotted
from below.
Cheers!
Dave
David Harvey
Conservator
Los Angeles, California USA
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