You look it up in the data from the manufacturer.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

Hi,
It depends on the type of nozzle, drop an email or call the vendor of cooling tower to get support.
Good luck
Pierre

Hi EdStainless, pierreick,

The company which sold the Cooling Tower(Waltco Systems,ON) is no longer existing, hence cannot contact the vendor. I can contact another vendor SPX Cooling Technologies and try to get information if possible. Also from the attached document PRC 12.0.1 of AXA there is a derivation and formula given for "K" on page 6/16 in terms Cd, Pipe Dia D, and fluid density. However the value I am getting is very low. I want to know if I am correct in using this formula. If yes why is the so low.

The formula is

K= Cd*(PI D^2/4)*SQRT(2gc/Rho)

Cd = 0.62
D = 2.157 inches = 2.157 /12 = 0.17975 ft ( for 2" Sch 10 Nozzle)
Rho = 62.4 lbm/ft3

K = 0.62*(22/7/4)*(0.17975^2)*SQRT(2*32.174/62.4)
= 0.62*0.785*0.0323*1.015 = 0.0159 ft3sec-1/(lbf/ft2)^0.5
= 0.0159*448.8311*12 US gpm/(psi^0.5)
= 86.016 US gpm/(psi^0.5)

From the AXA paper the value of K for 1/2" sprinkler head is 5.6 so for 2" nozzle t should be higher than 5.6 gpm/psi^0.5. I want to understand what is wrong. I will contact SPX Technologies tomorrow and try parallelly.

Thanks and Regards,
Pavan Kumar

• https://files.engineering.com/getfile.aspx?folder=5d1d2fdf-95d0-4c0d-9905-5

Quote (Pavan Kumar)

I can contact another vendor SPX Cooling Technologies and try to get information if possible.

Yes, or an OEM Manufacturer Cooling Tower Parts Supplier like Cyrco, Inc. There are others. Ask them the make and model of spray nozzle Waltco bought/used.

Good Luck,
Latexman

With a bit of luck the nozzle part number will be stamped on the nozzle itself - but surely covered with years of gunk build-up.

Katmar Software - AioFlo Pipe Hydraulics
http://katmarsoftware.com

"An undefined problem has an infinite number of solutions"

Hi,
it seems that Chalmers group took over waltco systems Ltd.
Consider the link underneath.
https://www.thomasnet.com/profile/30111060/chalmer...

Pierre

Hi All,

I found that I did a mistake in my calculation in the conversion from ft3sec-1/[(lbf/ft2)^0.5] to US gpm/(psi^0.5). Instead of multiplying by 12 I divided. I have now corrected the calculation(shown in red in thread above). The value now I calculate for K is 86.016 gpm/(psi^0.5). Does this number look reasonable?.

I also called SPX and they said they will get back to after some time. What system design density should I use?. Can I adjust the design density in gpm/ft2 that gives me a reasonable water demand and pressure?. NFPA 13 gives some guidelines but the numbers apply to large areas of application and my cooling tower area is only 120 ft2. Your suggestions will be very helpful to complete my calculations. How are calculations for Spray pipe pressure calculation for Counter flow Cooling Towers, is it by the Tree Calculation Method. In that case what design density should be used?.

Thanks and Regards,
Pavan Kumar

Hi pierreick ,

I checked the website for Chalmers group but it seems they are in Cooling Tower business.

Thanks and Regards,
Pavan Kumar