Hello. I would appreciate if someone could enlighten me about obstruction criteria for storage sprinklers per FM DS 02-00. Table 2.5.4.5.4.1 of Interim revision January 2024, tells that when the obstruction is less than 24", it needs to be checked where the obstruction is located to avoid extra...
I have a situation of sprinkler is a small skylight. I need to install it so no question about that.
However, as this lies inside my application area, it seems I cannot find a reference in NFPA 13 on how to deal with it. Do I need to include it or not?
My understanding is not, since it only...
I shouldn't be asking this but I am. As seen below, the flow is running as per the red arrows. The flow through F is only happening towards E, not the other way.
On hydraulic node F (and B), what equivalent length would you incorporate in the calculations, of an elbow or of a tee? It seems i...
thread184-206768
Interesting to read. SprinklerDesigner2 hopefully you never had issues there.
One thing I would like to note though, mainly for my understanding, is that the 149 psi for a standard 2 1/2" hydrant butt (refered in post Nr 8) is understood as the pressure difference exerted on...
Can someone please shed some light on the following.
NFPA 13, edition 2019
18.5.7.1 Each run of pipe between changes in direction shall be provided with both lateral and
longitudinal bracing, unless the requirements of 18.5.7.2 are met.
The way I read this is that a change of direction is at...
I would like to post this general question, mainly to the reviewers/regulators visiting this forum.
When you get drawings showing an application area (AA) such as this...
do you consider it fine? I personally don't as the area limits are not centered between sprinklers. The problem with...
I had this question for some good time now and always forgot to ask. Now it s the time.
The equation per the thread title is for calculating thrust blocks for vertical movement. However looking closely, it seems that the product of Vg x Wm gives mass while the product of P x A gives force (of...
Hello,
I am looking for the correct sprinkler arrangement in protecting single row racks over 7.6 m (25') height for class I through IV per NFPA 13. The two racks form an aisle of 2.7 m (8'-10"). The outside faces of the racks are free to open space from one side and 1 m (3'-3") away from a...
The application is industrial located in the US. Typically we go by EH G1 and we are installing process protection and for obstructions (including platforms) much lower below the roof. We need to provide data for the building sprinkler contractor for some tie in points and flow requirements...
This is general question. How do you guys claculate the pressure loss through a flexible pipe supplying a sprinkler? From the manufacturer's data I see one column with the actual pipe length and one with the equivalent based on 1" S40. So assuming I have my piping system made of S40, do I need...
I 'm trying to apply the general flow equation for a simpe one straight line gas system and I would like to understand one thing.
In order to calculate the flow I need to calculate the friction factor f first which requires calculation of the Re number which is depended on the flow I am...
Hello all,
I came across the following issue and I would appreciate any help or recommendations.
I have a rectangular shaped industrial oven which has some maintenance doors on the side, around every 50 to 60 ft. There are cases where these doors may be open either accidentally or for any...
I just wanted to know one thing. In a fully sprinklered building, type II(000) that requires additional column protection from a fixed spray system, what would be the water supply duration for the fixed system? I ve looked in NFPA 15 which doesn't seem to cover that. Section 7.1.10.3 throws me...
Regarding roll paper storage, looking at table 19.1.2.1.3(a) it looks like up to 10 ft of storage high, 0.3 gpm/ft2 over 2000 ft2 for heavyweight & mediumweight is required. However, par. 19.1.2.1.1 says that up to 10 ft height, ordinary hazard group 2 densities can be used (e.g. 0.2 gpm/ft2)...
