Ray, To answer your questions:
(1) This water purveyor, along with most of the WP's we deal with, require an RPZ when there is anti-freeze in the system. (2) The installation of an 1 1/2" RPZ is much more cost efficient than removing the six inch double check and installing a new 6" RPZ. (3) See #2 (4) The sprinklers with anti-freeze are higher than the interface (5) The existing system is about 600 gallons (6) The anti-freeze system is about 12 gallons (7) See #2 I think you are going towards using the system itself as an expansion chamber. I personally think that is a great idea, but when you put in an RPZ as is required here, you need to have the expansion tank. Even if you were to change out the double check for an RPZ, 13, to the best of my knowledge, does not make an exception to the expansion chamber requirement based on the volume of the system you are feeding from. Thanks, Mike Wisneski _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
