EE's,
I have a question about checking oil level in transformers. We recently checked the oil level in all of our transformers. We connected a fitting to the drain valve and then connected tygon tubing and held the tubing to the height of the transformer. We cracked the drain valve open and...
Hello EE,
How do you know how much oil you have in your transformer with a level gauge that has the indication of Low, 25 deg C, and Hi? The needle of the level guage is currently slightly higher than 25 deg C. Am I suppose to reference that temperature to the transformer oil temperature...
Gentlemen,
It has been a long time since I have dealt with pump curves. I have a pump that has a 7.375" diameter impellar, 159-gpm BEP, and 187' TDH. I have also attached the pump curve. Is it possible to get 170 gpm out of this pump? Currently in the field we can't meet a 170-gpm setpoint...
I am new to the environment of mechanical seals. What cut sheet comparisons/compatabilities are we looking for when replacing an obsolete design mechanical seal with a newer design mechanical seal? Obviously shaft and bore diameters are imporant to match. Are there any other comparisons that...
Anybody know what are some good safe repair working practices on above ground double wall fuel oil storage tanks? We have some small corrosion damage on the top side of the outer shell that needs to be repaired. It will have a small gradual leak out of the storage tank when the outer shell is...
Gentlemen,
In the near future I will have to hire a contractor to make some welding repairs on some small pits on top of my oil storage tank. It originally had an API 650 STD stamp on the tank but has fallen off in the past. So the tank doesn't have any stamp indication of an API STF on it...
Greetings!
Does anyone know how to calculate a CFM quantity for a 24' x 16' office area? There isn't any servers or extra heat load in the area, it is just people. Currently I have 1200-CFM serving this room and the users are still complaining about heat/cool airflow issues. Any guidance?
Hello all,
I have a refrigerant recovery tank with an old manual that gives the maximum amount of pounds of R-500 and R-22 the tank can hold at one time. We are currently using R-134a and I need to find out the maximum allowable pounds of R-134a I can recover in the storage tank. Anyone know...
Question for the refrigeration engineers.
I have a 1000-ton York water cooled centrifugal chiller at the plant. It is 1 shell (condenser and evaporator are in 1 shell). From the manufacturer's operation and maintenance manual it doesn't show or talk about an interstage cooler (Innercooler...
Does anybody know if you can take the PE exam with 8 years or more of engineering experience? I got my BS of mech. Engineering from an ABET credited university and I never did take my EIT in my younger years.
Can someone explain to me setpoints on a desiccant instrument air dryer. Why are setpoints shown with these units -40 F/C? I understand when you compress air above atmosperic pressure the dew point temp will change. What does -40 F/C actually mean for the dew point temp for the compressed air...
Through my experience, the condenser section of a chiller is always larger and thus has more gpm and load. Is it a general rule of thumb that the condenser load in tons is always 25% greater than the evaporator load in tons? Is their a standard to this? At my plant which has 500-Ton...
In industry I always hear the terms compression and expansion tank.... Is there a difference? Are they the same thing? We have expansion and compression tanks all over our site. These tanks handle our CHW and HW loads for the site/buildings. HW temps are 180 and CHW temps are 42.... We use...
Can mils be a positive and a negative number? I've seen positive all the time. However by my operators rounds and readings, they are reporting negative. If I have a trip/alarm setpoint of (5/10)-mils for compressor vibration on a chiller, does that typically account for both magnitudes?
We have 3 DA tanks at our steam plant. 2 of the tanks have 2 sources of steam (medium and Low Pressure) serving as a steam blanket. 1 tank has only Low pressure going to it. We have to replace a valve that will not close on the low pressure steam line. I have attached a drawing for clarity...
I have a water cooled chiller that utilizes R-134a refrigerant. This chiller is equipped with a centrifugal 2-stage compressor, condenser, economizer, and an evaporator. The refrigeration cycle shows that in the economizer (intercooler) has a line going to both the evaporator and a line...
I have a water tube boiler with a superheater that is designed for 60,000 lb/hr, 650 deg F at 400-psig. I have noticed that they have operated the boiler in the past at 750 deg F. Should I have anything to worry about? The records show they have only done this once for a 6 hour period. The...