Recent content by matt81turner

The elapsed time of this happening is a couple of minutes max. We are going to conduct this test again with a higher gauge since the previous one read 0-300psi and pegged when the water filled the hydrant. There is a check valve upstream at the fire pump hundreds of feet away. (the fire pump is...

Of course, when using this formula we are assuming that any other variables such as elevation change are not a factor. With that in mind, anyone see a problem with using this formula?

OK guys. I think I have finally gotten close to figuring this out with the combined gas law. (P1V1)/T1 = (P2V2)/T2 P is pressure measured in atmospheres V is volume measured in liters (does this have to be in liters?) T is temperature in Kelvins 1 variables are initial state (when hydrant...

Thanks, I will get on that asap.

Thanks guys. I like to think of myself as a pretty intelligent person, but physics doesn't take long to make my brain hurt. I appreciate the insight. Now, if I could just come up with a formula that takes the variables (water volume and psi, ambient air volume and the temperatures) so that I...

Not exactly sure how much higher the pressure reading is. My boss recorded them isn't available right now. I greatly appreciate your time and will think about this more and report back tomorrow.

The water source pressure is measured at a different location with a calibrated psig gauge at aproximately identical elevation. Hope this helps.

Yes. OK, the gauge is PSIG - not absolute. It reads zero at atmospheric pressure. Right, it's a hydrant like outside at the curb. It's what's called a traffic model. The valve is 5' below grade and above this valve the vertical barrel and top section are dry until this valve is opened.

The gauge is calibrated and measures PSI/kpa. Forgive me, I am not familiar with the difference between psig and psia. The air in the barrel is at atmospheric pressure and temperature as well. When I contacted the hydrant manufacturer I was told this was normal and would occur every time. Now...

This is my first post in this forum. First and foremost, big thanks to anyone who takes time out to help me with this. I work for a fire protection company; one thing i service is fire hydrants. I recently discovered this and do not understand why this is happening: A hydrant contains...