17,000 gpm through a 4" hole under 40 psi?!
"a number published in a book"
Obviously you don't know who FM Global is. They have been in the business since the late 1800's and I can assure you that they have plenty of quailifed engineers on staff. So it's not just a number from some book. Also...
Thanks for the heads up. The situation I am dealing with is a pressurized on grade water tank supplying a fire protection sprinkler system. The tank size is 15,000 gallons containing 10,000 gallons of water. Full, it is under 120 psi air pressure. As it is about to empty the air pressure is 40 psi.
Hey "TenPenny" according to the Factory Mutual Hydraulics Tables Manual P6920 you are the winner. You said around 3,000 gpm well the manual states 3021. Thanks
David, that's the senerio I was attempting to discribe but apparently failed to do so, sorry. The answer you gave in your last reply is what I was looking for.
Thanks for the help.
Russell
Here's an example of my vision of what's happening.
Take a fire hydrant flowing all it can through one of it's 2-1/2" butts at the water supplies somewhat constant residual pressure. Insert a pitot gauge into the water stream and I will get a somewhat constant pressure for a period. Wrong?
I need to determine the flow of water in gpm through a 12" section of 4" diameter schedule 40 steel pipe under 40 psi of constant pressure. Temperature and elevation out of the equation. Is an answer possible with such limited information or is this question so "kindergarten" that I should be...
The Hydratec calc program does adjust the K-Factors. I can successfully do a DW calc with this program as well of course a HW calc. My problem is doing a correct calc of the anti-freeze in DW and the non-anti-freeze portion of the system suppling the anti-freeze portion of the system with HW. If...
Thanks Travis. I would very much like to talk to you about this post. I'm not experienced on how to best use this forum so I do not know how to connect with you off this forum.
Thank you very much,
Russell
Does anyone use the Hydracad stand alone calculation program? If so can you tell me the procedure. The program doesn't differentiate between the anti-freeze portion of the system and the non anti-freeze portion.
Thanks
Russell Rewis
firepe, I take no offense to your comments. I understand what you are saying. You are correct, I am taking on engineering; however, the state I am in does not require an engineer. I am not trying to justify our position but rather stating how it is. Taking on this responsibiliy is quite common...
firepe, no we do have an engineer in-house; however, we do have one on call when needed. Design-build in our area is when owners or contractors put the responsiblilty for a proper sprinkler system on the sprinkler contractor's certificate and licence. The only approval needed in most cases is...
That would be great. The insurance company for the project is my next contact. I have e-mailed the area representative for TVA as Travis suggested, but he is out of the country at the time.
As for questioning the design, well, as a small child I was one of those irritating kids that always...
Yes Travis, NFPA13 2007 chapter 20.3 is the area in there that addresses the siuation and that would do the trick as long as some adjustments are made to the storage configuration the owner is using.
cdafd, I'm the sprinkler contractor in Georgia. The project is a design/build with no engineer...
