i have a closed chilled water loop w/ glycol. total system volume is about 20,000 gallons.
I need to drain a section of pipe that is, fortunately, at the top of the system. This piece of pipe holds about 200 gallons of fluids.
I need to drain the fluid to totes to hold it while the pipe is...
I know from the following that a PRV should be set to maintain 4PSI at the top of the system for "positive venting".
https://www.deppmann.com/blog/monday-morning-minutes/07th/
But what if the PRV is actually at the top of the system? (Same elevation as my chilled water piping). Do i just set...
We recently discovered, when a huge mess was made, that the vent off our condensate receiver tank does not extend to outdoors. I want to extend the vent to outside but is there anything special about the termination of the pipe I need to do? Does it need to be a certain distance above grade...
Hi… question…….
I’m looking to locate a differential pressure sensor for a secondary pump VFD in a chilled water system. The chilled water system serves process equipment and runs 365 days a year.
I know that typically you want the sensor across your most remote piece of equipment to make sure...
Curious if anyone has an opinions on placing a humidifier before or after a cooling coil?
We have a process where we need to deliver 55 grains (+/-5). The AHU is 100% outdoor air.
So in the cold/dry winter it is no mystery. We heat the outdoor air and humidify.
On hot/moist summer days, again...
I have a parallel fan powered VAV box. It has a minimum primary CFM to provide ventilation. In cooling mode, electric reheat is used to prevent subcooling.
My packaged rooftop has a gas fired heating coil so it delivers primary heating air to the VAV box as well.
Question is, how do I prevent...
I have a 100% water chilled water plant that is going to get new chillers and be filled now with a 40% propylene glycol solution.
I need to check the existing cooling coils on the AHUs to make sure they are adequate to meeting the cooling load with the reduced capacity.
I know from the...
Hi!
I have a pump that serves a cooling tower. It was designed for 340GPM and 68 feet of head. In the installed condition, it is moving the 335GPM but head pressure is on 43 feet and its VFD is running at 45 HZ (2832RPM, max speed is 3600RPM). At the pump inlet the pressure is barely 1PSI, and...
Hi,
would motorized dampers to close of a duct be required if a duct is passing through a space that has FM200, but there is NO communication of air between the duct and the space? (Duct serves a completely different area. There are no registers/diffusers of any kind in the FM200 space). There...
Hi,
I don't know if any of you have any experience with pumps with integral VFDs such as the Armstrong design envelope series, but I just installed them for the first time on a chiller project. These pumps run lead lag and their own internal controllers decide when the lag pump needs to turn on...
