What is a Coefficient of Discharge?

8/4/2021

I have a little different spin on things this week that I'm excited to share.

Last month I wrote a bit about flow coming from hydrants and included PDF flow charts relating the measured pitot pressure to the estimated flow coming from the orifice.

But what is a Coefficient of Discharge?

Check out this new video below - it is a sample from our MeyerFire University platform that we're creating for later this fall. If you don't see the video, click here.

This is all new format for this site, so I'm eager to hear what you think. Comment below or shoot me an email at joe@meyerfire.com.

Thanks and have a great rest of your week!

13 Comments

BIll

8/4/2021 11:28:24 am

Excellent!

Bill Greene

8/5/2021 12:29:25 pm

This is great information. Keep it coming!

Bill Greene
OSU (1964)

Alex

8/4/2021 11:29:16 am

Hi Joe,

Awesome video! Do you plan on making a video demonstrating water flow through the multiple hydrant outlets (smooth, square, etc)? I read the previous post regarding fire hydrant flow tests and think that would be an awesome addition to the video series.

Also, I know that insurance underwriters may have their own coefficients that they require to be used. For instance, FM Global is 0.1 lower than NFPA (0.9 goes to 0.8). It may be worth noting to always check with the local codes and building insurance underwriter when completing hydraulic calculations.

Thank you for the content!
Alex

Joe Meyer

8/4/2021 11:31:56 am

That's great feedback on FM requirements - I can absolutely explore that for future content.

Also - I do plan to run a video on the different coefficients and how they're typically applied for different discharge setups.

Great feedback, thanks Alex!

martin moffitt link

8/4/2021 11:35:38 am

Thanks short and sweet explanation....for non engineer types!

Adam

8/4/2021 11:43:24 am

I think that this is a really good explanation of the principal.

I have a constructive criticism for the video production, though - the intro/outro music volume should be adjusted to better match the volume of your voice. In an office, I don't want to have my volume up too high when watching videos, so when I turn the volume up to hear your voice, the music is louder than I would prefer.

Joe Meyer

8/4/2021 11:45:32 am

That's great feedback!

Easy to incorporate now, for sure. I can get a little too carried away with 'stadium rock' or whatever they call that genre nowadays.

Can definitely tune that on our end. Thanks Adam!

Kobus

8/4/2021 09:32:51 pm

Yip, I agree with Adam about the background music, I have high frequency hearing loss, thus difficult to hear voice over music. Good video!

Joe Meyer

8/4/2021 11:47:12 am

Also - just in the event it would be helpful - we do have full closed captions with the "CC" button in the bottom right of the video.

I don't exactly have a radio voice and I'm not at all offended by those who'd prefer it all to be on mute!

Brad Sparks

8/23/2021 11:27:36 am

Your responses are perfectly done Joe. Love the humility and respect you give others.

Bob Stone

8/4/2021 01:03:37 pm

This is very informative video.
Well done and easy to watch.
I think that it will be well received.

Greg

8/5/2021 07:09:54 am

Well done. Clear, concise and informative. The video format is helpful in relaying the principle.

Chris

8/5/2021 10:33:14 am

How does a service pump effect the coefficient discharge? Would it lower the discharge pressure because you have more pressure and less volume?

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What is a Coefficient of Discharge?

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