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Thank you all for the replies! I will indeed isolate the expansion tank.

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...

@georgeverghese In the first place, why the level overflow from this tank? - what happened to the high level trip transmitter / switch or the trip loop ? Is it installed and configured correctly? When was the last time this trip loop was checked by your instrument maintenance team? The tank...

@racookpe1978 Steam condensate, or some other liquid? Steam condensate What environment hazards in the liquid? The steam is chemically treated which is all the more reason to be venting it outdoors and not inside the building!!! What safety hazards (heat, hot liquid dropping or spraying on...

@Littleinch Why a "huge mess"? Did you get fluid out of the vent? The vent terminates into a pit that is normally exhausted by a fan. The fan was turned off, and the pit filled with steam/water vapor which backed up into the rooms above the pit. Everything in those rooms got the sauna...

@pennpiper - What kind of building is this? Why does that matter? - Does it have a built in Drain System for Spills? Yes, the tank can be drained, but the issue is a vent line, not the drain. - How far is it to the nearest Wall? About 20 feet - What is just outside that wall? An areaway...

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...

Thanks all for your help. There is a process branch just a few feet away from the most remote AHU branch so we are just going to put it in the process branch, then open the chilled water valves, ramp up the pumps, and measure the DP to determine our setpoint.

Sketch attached as requested. There are a couple of other branches to AHUs between the process equipment and the last AHU which I didn't show, but you get the idea. The entire system is at the same elevation on one floor of the building.

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...

I agree berkshire. Have a DDC system so should be able to do this with programming.

Let me clarify......... Suppose I'm out in the desert bringing in 100% outdoor air. 95 degrees, 5% RH I want 55 grains in my supply to my space. Should I humidify to 55 grains before I hit the cooling coil (assuming the coil is set to a temperature so as to NO dehumidify the air below 55...

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...

Thanks for the replies. Basically we are putting it in because the Owner wants it. Their property management group is spread thin and they don't want to be bothered with draining and filling the system in the winter to prevent freezing. So they are willing to accept all the trade offs. I told...

So... update to this............... Despite the design head the actual resistance the pump sees is only the 45 ft. So the balancer slowed down the VFC because the flow was too high. I don't think the cavitating has anything to do with the pump discharge. There is a 3-way bypass valve from the...

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...