Not sure what type of fire sprinklers you are using but many are available in high pressure, up to 250 psi. ESFR and CMSA are usually not available in high pressure but CMDA typically are.
4.7.7.2 says not to use relief valves to meet the requirements of the shutoff head being the pump churn plus the minimum suction head to avoid pressures exceeding what the components are rated. You can also figure in the working pressure where the sprinkler are. If the sprinklers are high in the...
As cdafd and Travis said, you cannot have sidewalls spray perpendicular to the slope when the slope exceeds 2:12 unless the sprinkler is listed for that and I know of no sprinkler listed for this use. I believe it is because a fire plume will bypass the sprinkler due to the placement of the...
NFPA 13 defines horizontal as no more than 2:12 slope, sloped ceilings are more than 2:12 slope. Flat just means a continuous plane. Generally, if the slope exceeds 2:12, you are limited to placing the sidewall sprinklers at the top and aiming them down the slope with the deflectors parallel to...
Use a smaller K factor fire sprinkler and increase pipe size(s) are the most common ways to reduce flow. You can also use different K factors for pendent, upright and sidewall sprinklers in the same compartment strategically to reduce flow sometimes.
Your fire pump size should be 90%-140% of the fire water (standpipe) demand per NFPA 20. The 1,500 gpm pump is too big. This is assuming the fire pump is inside the building and supplying the fire sprinklers and standpipes inside the building. That also means the city water supply gives you the...
You'll could split the flow into two 4" pipes instead of one 6" pipe in order to hang it from the available structure. Two 4" pipes will give you 28.5 sq.in. of area vs. 31.7 sq.in. of a single 6". That would have slightly higher friction losses but you can install it.
Fire pumps must be listed if you want to use them for fire protection. A jockey pump is not listed as a fire pump. This arrangement does not comply with NFPA 20.
I have a couple questions:
1. How does a jockey pump reduce pipe sizes? Typically jockey pumps flow 5-20 gpm. A single 1/2"...
Per NFPA 25 5.4.1.3.2, any residential sprinkler made before 2003 can be replaced with a sprinkler +/- 5% of the K-factor. You could use a 3.7 - 4.1 K factor sprinkler. The Senju pendents above are 3.7K and Viking makes a VK480 4.0K HSW.
Find the data sheet for the original sprinkler and compare it to available sprinklers. Pull one from the spare sprinkler box and look closely for the SIN number.
If anything goes wrong, the owner will sue you, the GC, the city, and the guy who takes out the trash. If you make a document stating someone else is liable for anything you do, it will be an office joke on its way to the trash can. You need errors and omission insurance, period.
Through no...
Correct, Q3 will not equal Q1. Instead, you should calculate the friction loss between Q3 and node 02A, then solve for its K factor and balance the flow to the pressure arrived at by the opposite branch line which is about 11.3 psi. Everything after node 02A is wrong. You are also correct, there...
If you look in NFPA 13, 14, 15, 72 and probably some others there is a list in each standard about what the minimum amount of information is required on all shop drawings. I'm always surprised how many people do not follow that list when making shop drawings.
