There is a flaw in your reasoning. IF 14.4.4.5 was a connection from
different pipes to the drain without any interconnection, how could
it impact the hydraulic calculation since the flow would only be out
of the system to the drain?
The tie-in drain is used only 8.15.2.5.2.4 and 8.15.2.5.3.4 (which
provides the basic definition of interconnection branch lines). Then
chap 14 tells use tie-ins are not to be part of the hydraulic
calculation which is conservative since only a gain (small as it
might be) would be seen.
It is intended to minimize their use IF POSSIBLE but the explicit
text in the drain section trumps the general text on forbidding grids
in dry pipe systems.
Roland
On Jun 28, 2007, at 8:59 AM, [EMAIL PROTECTED] wrote:
Easy. 8.15.2.5.3.4 specifically addresses multiple adjacent
trapped branch
pipes and 14.4.4.5 does not. 14.4.4.5 is general and is not
addressing the
connecting of the ends of branch lines. 14.4.4.5 is addressing a
drain
that connects to a pipe in the system and drains to an outlet without
connection to other piping in the system.
Thank You
Rahe Loftin, P.E.
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