It IS black and white. That's what I meant by the drain requirement
trumping the grid restriction.
Roland
On Jun 28, 2007, at 10:33 AM, Todd Williams - work wrote:
Am I missing something here? 8.15.2.5.3.4 states: 'Tie-in drains
SHALL be provided for multiple adjacent trapped branch lines.....'.
Shall is just a grammatically correct way of saying y'gotta. If you
have the multiple adjacent trapped branch lines, they have to be
connected with a tie-in drain. Section 14.4.4.5 says not to include
them in hydraulic calculations. To me, that's a pretty open and
shut deal. Does it create a gridded dry system, technically yes,
but to me, this section says that this arrangement is allowed. Keep
in mind that the cross sectional area of 1" pipe is roughly 1/4 of
the CSA of 2" and 1/16th of 4". That creates a very different
scenario than say 4" and 3" where the ratio is 9/16. It would be
interesting to check trip times of a system with the tie-in drains
attached and one where they are plugged off.
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