Return Bends on pendant type wet sprinklers when the network is supplied by raw water sources. Return bends are also not necessary on wet systems that use a potable water supply.
There is insistence about their use for the reason that, black steel pipes would eventually corrode on the inside and...
Thanks for the replies.
Sizing manually using the ductulator is a breeze, but there are 145 AHUs whose ducting has to be sized. It is simply not feasible to play with the ductulator as it would take ages to do hand calculations.
It comes as a surprise that the software of a reputed manufacturer...
The ducting from our Air Handling units goes all the way to the VAVs and from there to the diffusers. Each VAV serves about 4 diffusers in the rooms.
We are using Trane Company’s VARITRANE equal friction duct sizing software for the design. There are a couple of difficulties being encountered...
Thanks to all respondents. I wrote earlier that the software has been acquired and it is functioning well without the need to borrow values of pipe diameters from the Pipe Schedule System. This thread can now be considered to be complete and closed.
Thanks again to BigInch, Artisi.......and all.
One more piece of information. The branches closer to the pump would require smaller pipe diameters from those that are listed in the Pipe Schedule System due to higher pressures near the pump. It therefore appears a waste to use pipe sizes that just depend on the count of sprinklers without...
Thanks a lot for the methodology involved.
The pipe schedule system of pipe sizing is fairly straightforward, and there is no need to use any software for that.If the hydraulically calculated pipe network requires input of the pipe diameters that are taken from the pipe schedule system table...
I am searching for the software to calculate hydraulically the pipe diameters of the firefighting network for extra hazard classification of the sprinkler system as per NFPA.
The sizing is to be calculated hydraulically and not by the Pipe Schedule System of NFPA.
In Chapter 13 of NFPA there is...
The 6 inch standpipe is 75 meters tall. Subjecting it to the code test pressure of 225 psi at the top of the standpipe will impose excessive pressure at the base of the riser.
Any suggestions of how it could be tested without such pressures.
Thanks
To: skdesigner (Mechanical):
1) If as you have stated, that as per NFPA 14-2013 11.4.2, the standpipe is tested as follows: "The hydro static test pressure shall be measured at the low elevation point of the individual system or zone being tested.", So, you use the gauge reading at the bottom of...
According to Pascal’s Law, the pressure inside a chamber that is full and pressurized with a fluid is constant.
Does this imply that the static pressure at the base of the pressurized chamber like a very tall column of pipe (in the vertical position) is the same as the static pressure measured...
SAK9: The supply, return and fresh air quantities measured at or near the machine all add up. The only problem is that the return air quantities are a fraction of what they should be when measured by the hood at the ceiling return diffusers.
SAK9
All that you say makes sense. I am receiving the Air Balancing work from a subcontractor.
I just need to know if supply is 400 CFM and return is coming at only 100 CFM, can the subcontractor be paid? Will these numbers be approved by the consultant? Or will the company have to do it all...
We have a fire pump set consisting of one electrical pump and a jockey plus the Diesel Pump that has a 1 meter cube capacity fuel tank adjacent to it. There is no automatic fill option in the fuel tank.
Are we in violation of NFPA if the fuel tank has no automatic make up system, no sight glass...
