Recent content by DieterVk

Anyone??

To OP: NFPA 15, chapter 7.4: exposure protection 10,2 l.min-1/m² over the surface of the vessel To others: Yes, the compound is pyrophoric. It is most probably stored at 10% in hexane to exclude moist. Yes, you should cool the vessel with water to protect from an external fire. Only if the...

According to several suppliers' websites of gas detectors, a catalytic bead sensor must be installed vertically with the gas sensor pointing towards the ground. If the gas sensor is not mounted in this way, they say, the gas sensor may not work correctly. But why is this? And is a horizontally...

No, I am a fire risk engineer. I was just looking for some inspiration.

Hi all, I'm fairly new to the industry. Now my employer wants me to write an essay/article about a subject I am willing to look into. Kind of a small specialization. But I can't find something interesting myself. I'm look into the field of fire risk engineering in chemical, petrochemical...

Stookeyfpe, My apologies, it's not CO2, it's IG55, a clean agent.

My initial post holds all data available. From this I can derive three points: 1) t=0s ---> c=43% 2) t=130s ---> c=38% 3) t=600s ---> c=22,2% So yes I can calculate the leak rate for this case. But as partial pressure and total pressure of the inert gas will be augmented, the leak rate also...

Yes, see my initial post: The results aren't good: Surface area leaks: 0,0592 m² Max accepted surface area leaks: 0,0128 m²

Stookeyfpe, It's not CO2, it's inert gas. A) The relief paths/leaks cannot be resolved as mentioned in my initial post. B) This exactly is my question. How do I do this?

Does nobody has any suggestions on secondary flooding?

Do you mean that the demanded water pressure at the hydrant is 2 bar? What kind of hydrant? What is the demanded flow? What is the pipe size? What is the pipe material (for estimating the pressure loss due friction)?

First you have to determine the most demanding scenario. For example 2 hydrants working simultaneously. This demands (for example) 2x 1000 lpm at 3 bar. Then your pump according to NFPA has to be: 625 GPM The working pressure depends on the length, diameter and friction of your pipe. If you...

I've done a fan test for a automatic fire extinguishing system with IG55 following the NFPA 2001, appendix C, enclosure integrity procedure. Known data CO2 quantity: 22,8 kg Real concentration: 43% Volume room: 29 m³ Max height room: 3,25 m Minimal concentration: 38% Temperature in the room...

Now you have all the information.

Hi all, I don't know how to calculate following problem: Problem: I have a room with a certain concentration of CO2. There is a leak which causes the concentration to fall over time. Known: CO2 concentration start = 43.0% CO2 concentration after 10 minutes = 22.2% CO2 concentration air...