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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...

@Cidona: Thank you very much for your good answer (!) You are absolutely right about the 5m restriction - that it refers to the pump manufacturer rather than the calc. section. But why does the pump manufacturer have to keep the value down at 5m? My problem is that I have a pump manufacturer...

:-) I'm sorry - "NPHA" should of course be "NPSH" in the above.

Thank you very much for your answer. But I know all that - and that leaves the same question: Why is it relevant to set up a maximum for the required NPHA by the pump (16,7 ft), as long as you make sure, that the available NPSH are bigger than the requried NFPA. In this case the required NPSH...

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...

In Denmark it is thus that the local Fire Marshall does not have the necessary competency to approve the sprinkler system. Therefore, there are independent companies that have the necessary expertise to advise the Fire Marshall. So-called accredited inspection companies. And it is those who...

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...

Thank you for a fast reply, Dave. I'm aware that it will take longer for the valve to operate if you have a high air presure - if you haven't got a accelerator that is. In this case it will be the 'water transit time' that will be the decisive factor. And it is here that I see the benefit by the...

"It requires a lower air pressure so you get a faster delivery time." I have aways thought that you would get a faster delivery time if you had a high air pressure rather than a low in the system. The argument for this should be that you would have a more compressed system, which should result...

I have just ordered my first shipment of these very interesting Sammy Express. But I'm a bit chocked by the price! I have to pay 2.8 USD apiece. I'm from europe (Denmark) though and maybe they are more expensive by that reason. So it could be very interesting to hear what the cost is in US...

"Tyco EC-11 sprinklers are QR for light hazard applications in spacing of 18'x18'. They are also QR for light hazard in 20'x20' at certain temps and styles. The sprinkler is also QR for Ord Haz up to 14'x14' spacing. So, they may still be able to take the QR reduction." I'm not sure that I...

Thank you for your quick answer. But how can you say, that it's a standard response? Is there a specific way to see that?

Picture 3...http://files.engineering.com/getfile.aspx?folder=49ce3d67-8562-4dda-b0dd-27bd66bb9530&file=091020081221.jpg

Picture 2...http://files.engineering.com/getfile.aspx?folder=2b98db12-184f-4815-ab1e-d2635aabdf87&file=091020081222.jpg

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...