Elizabeth, I can second Dave Harvey's experience with the leaking of dry pipe systems that caused damage to objects in storage not only from the drips of oil but from failure of the joints themselves. The one system with which I am most familiar, installed in a collections storage building constructed in 1995-1997, had so many problems that it was completely replaced with a wet pipe system in 2004, necessitating major relocations of collections in existing storage areas while the replacement took place and a general dislocation of people, offices, labs, etc., for the better part of a year. If you would like more detailed information, please contact me off-list. Martha Katz-Hyman Newport News, VA ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).