Another question for you! Two irrigation questions in an hour, that must be a record.
I am concerned that there's something wrong with the velocity calculation on my lateral pipes because I'm getting inconsistent and confusing results. I'm referring to what I see when I click "size pipe" and click on a valve. It's probably doing what it's supposed to do and I just don't understand what I'm looking at yet.
Sometimes it says "actual velocity: xx" in red, which makes me worried, but the number is less than the max velocity I set. So why is it red? To make life more exciting?
Other times it says the actual velocity is the same number as the max velocity I set, and if I slide the max velocity around, the actual velocity changes to be the same thing... which makes me think it's spitting out an actual velocity that is equal to the max velocity rather than based on any calculation. I'm guessing this is because the calculation hasn't happened yet, and it will use this number to calculate the appropriate pipe sizes after I click okay. But why does it only act like this sometimes?
Thank you!
I am concerned that there's something wrong with the velocity calculation on my lateral pipes because I'm getting inconsistent and confusing results. I'm referring to what I see when I click "size pipe" and click on a valve. It's probably doing what it's supposed to do and I just don't understand what I'm looking at yet.
Sometimes it says "actual velocity: xx" in red, which makes me worried, but the number is less than the max velocity I set. So why is it red? To make life more exciting?
Other times it says the actual velocity is the same number as the max velocity I set, and if I slide the max velocity around, the actual velocity changes to be the same thing... which makes me think it's spitting out an actual velocity that is equal to the max velocity rather than based on any calculation. I'm guessing this is because the calculation hasn't happened yet, and it will use this number to calculate the appropriate pipe sizes after I click okay. But why does it only act like this sometimes?
Thank you!
Katherine,
The actual velocity is what the system is going to use to size your valve. It turns red when the Max velocity exceeds what is needed based on your pressure variation factor limits. So, while it will not turn red every time and on every valve, it sounds like it is doing the calculations correctly and doing its job to warn you that things are a bit different than what you want the fps to be. Take a look at the link below on a deeper explanation of the size lateral dialog box and all the features within the dialog.
Sizing Lateral Dialog box- One valve at a time
The actual velocity is what the system is going to use to size your valve. It turns red when the Max velocity exceeds what is needed based on your pressure variation factor limits. So, while it will not turn red every time and on every valve, it sounds like it is doing the calculations correctly and doing its job to warn you that things are a bit different than what you want the fps to be. Take a look at the link below on a deeper explanation of the size lateral dialog box and all the features within the dialog.
Sizing Lateral Dialog box- One valve at a time
Thanks, Jake!
I reviewed that link, and I'm still not clear on why the actual velocity would be red when it's below the max velocity. For example, my max velocity is set to 5 and the actual velocity is 3. That is good, I'm pretty sure. So why is it red?
Now I have a new question. This says actual velocity is calculated based on the pressure variation I have entered. Does that mean it's not calculating velocity based on flow and pipe size?
Do you understand what's going on when it's giving me an actual velocity number that is the same as the max velocity?
I reviewed that link, and I'm still not clear on why the actual velocity would be red when it's below the max velocity. For example, my max velocity is set to 5 and the actual velocity is 3. That is good, I'm pretty sure. So why is it red?
Now I have a new question. This says actual velocity is calculated based on the pressure variation I have entered. Does that mean it's not calculating velocity based on flow and pipe size?
Do you understand what's going on when it's giving me an actual velocity number that is the same as the max velocity?
Katherine,
It states Maximum as that is the maximum velocity, as in it can't be higher than that, but it may be lower. This depends on the Pressure Variation Factor. If you would rather accept whatever pressure loss is generated, you can set the PVF to 0, and the velocity will remain at maximum.
It does not calculate velocity, it calculates pipe size, depending on flow and velocity. Then depending on pressure loss, it may reduce the velocity until enough pipe sizes are larger, and friction loss is within an acceptable range.
--J
It states Maximum as that is the maximum velocity, as in it can't be higher than that, but it may be lower. This depends on the Pressure Variation Factor. If you would rather accept whatever pressure loss is generated, you can set the PVF to 0, and the velocity will remain at maximum.
It does not calculate velocity, it calculates pipe size, depending on flow and velocity. Then depending on pressure loss, it may reduce the velocity until enough pipe sizes are larger, and friction loss is within an acceptable range.
--J
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