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Hi, I'm planning to use a 'Single Interlock Preaction Type A Sprinkler System (Tyco Model DV-5)' in a project. The system is electrically activated. Regarding this I have a maybe little silly question - but I hope you can bear with this. The electrical system activates which will activate the...

Hi, I have a question which is a little hard for me to figure out. I've attached a sketch showing the case. I have a parking garage which is fully sprinkled. This parking garage is not ended with a normal wall, but with some open stairs, which is 30% open (see the sketch). Above the staircase is...

Hi, I am sprinkler designer from Europe. I am writing to you because I hope maybe you can give me some feedback on the following topic. First of all - we use the European Insurance Rules "CEA 4001". In these codes the following reads: "The NPSH required by the pump shall not exceed 5m at...

Hi Guys, I was wondering if there is a friendly soul in this forum that could please help me with my curiosity? I'm from Denmark, and I have a question about AHJ's. The question is; Which requirements should you need to become an AHJ in the states? I'm not asking because I would like to become...

I have been using Tyco’s EC-11 sprinkler for some time now. And I just somehow know that when I’m using the sprinkler in OH for a length and width of (example) 4.3 m x 4.7 m - I have to find the start pressure at the sprinklers in the tables for 4.9 m x 4.9 m. But why is that? I can’t find the...

I have a question regarding the position of the sprinkler frame. Should the two vertical frames on a sprinkler be positioned along the branchline or acoss the branchline? As I see it, the frame should be positioned across the branchline because the branchline works as an obstruction for the...

I have a system where I'm using couplings to connect the 40 mm. branchlines (steel pipe). NFPA 13 says that I maximum can have 15 inches between the hangers (table 9.2.2.1). And that I need a minimum of at least one hanger of each section of pipe. But I can't find anything about a maximum...

I have uploaded some pictures of an old Reliable sprinkler, that need to be replaced. They have been sitting in a sky lights. My problem is, that I do'nt know the response time - so I do'nt know which sprinkler type to replace them with. Anybodu that knows the type?

Hi, I have a question regarding Large Drop sprinklers and spacing. I have a noncombustible obstructed construction, rack storage, where I would like to use LD sprinklers. But the building construction is build with 24 ft. between the center of the beams (concrete tee construction). This will...

I am in doubt weather or not a trapezoid construction as shown in the attached picture should be categorised as obstructed combustible. What would you think? And where would I be able to find a list of definitions for combustible materials?

In the NPPA 13 code, the Design Criteria (ex. table 16.2.2.1) fore Large Drop and Specific Application Control Mode sprinklers does not relate to whether or not the commodity is encapsulated. This really concerns me, because it is a huge factor in the classification. As opposed to this the...

According to European Standards we have to use two Fire Pumps when we are installing a water tank in stead of a public water supply. I can not find anything in the NFPA 13 regarding the demand of number of Fire Pumps. I hope a friendly soul could post the table concerning this? Please.

It has come to my information that FM has allowed that the K16.8 CMSA sprinkler now can be used as a protection option whereever the K11.2 CMSA sprinkler (Large Drop) can be used. The same installation and design guidelines apply to both sprinklers, except for the minimum required operation...

I am a Danish Sprinkler Engineer. In Europe, we do not use the NFPA 13 rules as primary – but are allowed to if wanted. The NFPA 13 is much more flexible and stays up to date with the development of the new sprinkler types which the European rules does not. Therefore I am beginning to learn the...

Hi, I'm a sprinkler Engineer from Denmark, and are new at this forum. Very interresting site, I must add. So can't help wondering whether or not you guys maybe can help me out. In Denmark we are primary using the CEA rules, but are allowed to use the NFPA 13 rules though. I'm considering to do...