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Existing 6in. DPV.........we need minimum 6 in. diameter. It does not look good at this juncture!

Are there ANY dry pipe system valves designed/approved to be installed in the horizontal position. We have a very unique challenge........horizontal dry pipe valve would be the best option; however, I cannot find any approved for horizontal oreintation!! Thanks

You typically need to have 20 or more sprinklers which warrant testing to justify testing rather than replacing. I assume you have 8-20 sprinklers in the boiler/machine room.......might be more cost effective to simply replace all of the sprinklers (unless the two rooms have >20 sprinklers)...

It is really not a ceiling pocket because there are no vertical barriers to define the pocket. Also, NFPA 13 states the following regarding ceiling pockets: The total size of all unprotected ceiling pockets in the same compartment within 10 ft (3 m) of each other does not exceed 1000 ft3 (28.3...

Thanks cdafd!! The combination of NFPA 1 section 13.3.3.3 and NFPA 13 Section 8.15.4 along with the fastfacts article you provided should be enough for any reasonable person to realize they have a potential problem.

Maybe the attached picture will help........the walls in this room do not reach the steel deck above the suspended ceiling tiles (creates a huge space above the tiles in all directions). The sprinklers at the steel deck are not throughout; only installed directly above where the tiles have been...

Class II steel deck above. They changed from pendent to upright sprinklers at the roof deck for areas where the suspended ceiling tiles were removed. I would accept this arrangement IF we had vertical walls in the opening (it would be a large ceiling pocket!). NFPA 1 section 13.3.3.3 and NFPA...

I have a customer who has removed some of the suspended ceiling tiles (20ftx20ft area) in the middle of a large room. Elementary school occupancy. Steel deck above is 10 ft higher than the mineral tile ceiling. Pendent sprinklers remain where tiles remain. Upright sprinklers installed directly...

The arrangement would be better with a gate valve directly upstream of the flow meter; therefore, you could eliminate the possibility of turbulent water flow in the vicinity of the flow meter. I am old school and I almost always use a test header if installed.........butterfly valves work just...

I doubt the butterfly valve is the problem (as long as the control valve directly upstream of the fire pump is a gate valve; not a butterfly) The acceptance test should be completed using a test header (NOT using a flow meter). The test header results whoulc be used to confirm the flow meter is...

Good point NJ1........details are important & I missed the mark on this one! I am not aware of any requirement for alarm devices in the vicinity of the system FDC.

International Fire Code (2006) states the following: 903.4.2 Alarms. Approved audible devices shall be connected to every automatic sprinkler system. Such sprinkler water-flow alarm devices shall be activated by water flow equivalent to the flow of a single sprinkler of the smallest orifice...

Commercial/Industrial facilities. I have a customer who is being charged a SIGNIFICANT amount for the water usage after the intial system fill and fire pump flow testing (intial acceptance testing activities).

Part 1: Does anyone have any firm documentation which indicates whether or not public water departments can or cannot charge for water usage in dedicated fire service mains? Part 2: What percentage of dedicated fire service mains in your area of the country would you say already have public...

I re-read my post after reading LCREP post. Maybe I should clarify my comments.......I meant this comnbination would probably be VERY effective against fire incidents in general. ESFR systems and significant volumes of "flammable" liquids are generally a VERY bad combination...........too many...

Very interesting........first thought would be "How much foaming agent would be required for an ESFR foam-water system?" WOW The combination would probably be VERY effective in an actual fire incident. I also want to see the initial acceptance test on video (if this system is every designed...

Any water pump which takes suction from a public supply is generally considered a booster pump; however, the important distinction is whether or not the pump in question is a dedicated pump for the water-based fire protection system.......if the answer is yes, then NFPA considers the pump a fire...

Recommend a proper engineering analysis be conducted by a qualified engineer (or fire protection contractor with experience in this type of evaluation). There are so many variables which need to be evaluated/considered to properly determine the adequacy of the fire protection systems at this...

Does anyone know precisely what constitutes a "loaded" sprinkler head based on NFPA 25. NFPA 25 (2011 Edition) indicates the following: 5.2.1.1.4 Any sprinkler shall be replaced that has signs of leakage; is painted, other than by the sprinkler manufacturer, corroded, damaged, or loaded; or is...

Lightecho: Your posts are always informative and useful; you are a valuable contributor. I also want to state that I appreciate your kind words regarding my posts. For the record: I might have sounded like I have a problem with computers, but this is not true at all. I am actually very...