Can AAV install on top of wet riser inside the room of top off the building?
Kindly refer attached NFPA code A8.16.6 about AAV
Yes. It is best to install it at the highest point of every sprinkler system to remove as much air as possible.
Well depending on the system and building,
You could tap and make that your inspector test, or just install an extra drain pipe.
Well-you are talking about two different types of air vents and purposes here. The PDF scan is referring to an air vent on a drain riser used as an express drain. The vent suggestion is to install it at the top of the drain riser to avoid air lock and prevent the drain riser from backing up and not draining correctly.
If you are talking about the required air venting for the sprinkler system piping-see below- these required vents are intended to remove trapped air from the system piping, in an attempt to reduce piping corrosion. (See below)
8.1.5 Air Venting. A single air vent with a connection conforming to Section 16.7 shall be provided on each wet pipesystem utilizing metallic pipe. (See A.16.7.)
16.7* Air Venting. The vent required by 8.1.5 shall be located near a high point in the system to allow air to be removed from that portion of the system by one of the following methods:(1) Manual valve, minimum 1/2 in. (15 mm) size(2) Automatic air vent(3)Remote inspector’s test valve(4)Other approved means
If you are asking the question on how to design/install and comply-as noted in the requirement-you have a few options. Which one you choose-depends on the building and piping layout, and if you want to do just the required minimum-or consider the customer's best interests, or not.
If possible-one of the best options is to arrange the very highest elevation piping, so all of it can be vented by opening an inspector's test or vent valve. Another good option-is to use a proprietary automatic vent-attached to the high point of the system. They work well-but be careful to avoid locating the device in a location where it could damage the building features if it accidentally plugged up and overflowed. The best way-but not necessarily the cheapest-is to tie all of the branch lines together-so all can be vented by opening one valve. The cheapest way to comply with the venting requirement-is to locate at least a 1/2" size valve at one high point of the system-that is accessible. As I understand-this complies with the requirements-however-in my opinion-it will not be the best solution for the customer. Good luck!
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