I am looking for some input on how others perform LOTO on Hansen 3-way valves and Vilter stop/check valves. The valve stem is all there is and is acceptable to drill the stem to attach a locking device? Or, does the operator put the valve in the closed position and put one of those external...
We are on the right side of the curve, as we have been over the last 40 years. The erosion damage is also visible on the wear rings, but I don't think I included a picture of that.
We know that this pump is not in a suitable application, but the reason why we have all of a sudden seen...
A little bit of an update. We took out the impeller today and I have spent a little more time analyzing it. Actually looking at the high pressure side of the vane on the suction. As Artisi was saying, it looks more like erosion. My question to Artisi is, why did you think it was erosion when...
Artisi, the impellers are OEM. I can probably get a material origin from them. I will investigate the erosion issue further. I am out of town this week and I will put more pictures when I get back.
btrueblood, the damage is focused more on the inboard end, but the location on both the...
There is a flowmeter and the flow has stayed roughly the same. There has been more demand since the plant production was increased 20 years ago. The one thing about the flowmeter is I don't think that the orifice has been checked in 5-10 years. The inlet block valve has failed in 3 months and...
Here is the inboard end of impeller. The wear rings also have more damage on this impeller than some other failed ones I have seen.http://files.engineering.com/getfile.aspx?folder=cbed9fff-0ca6-45fe-8e63-062b1347105e&file=100_1118.jpg
Here is a picture of the outboard end of the impeller. The failure have been every year to year and a half. For the last 9 months we have had 3 failures and the element in there now needs to be...
The pump suction pressure I have seen to be 21 psig and the vapor pressure of the potassium carbonate @230F is 19.1 psia. At the flowrate that the pressure transmitter is displaying we are running at about 4' above vapor pressure. This is a really small margin and I am trying to figure out if...
Does anyone know if it is standard practice to include the effect that dissolved gasses has on the vapor pressure of a fluid? All that I have been able to find is a specification sheet for potassium carbonate at one concentration and temperature. I know that we have been having problems with...
A little more information for all of you. At that speed the mfg. said it is good for ~50hp and ~80hp thermally. The turbine and gearbox is seldomly loaded. They usually are on a slow roll and are engaged when/if we lose power. With the subsequent drop in speed, the clutch will engage and...
Well, I guess I am kind of puzzled why we are just seeing problems now. Fifteen or so years ago they changed the hp of the driver to 45hp and didn't change the speed. I'll have to look at how they operate this to see if the fan is being used often or not. I will probably just have the...
This seems to be a pretty basic question, but I have probably been over-thinking it. I am trying to clarify some torque issues with one of our gearboxes. Is there an equation for torque that the manufactures use to rate their gearboxes? I know that Power=Torque*speed or...
I am looking to find the viscosity of ammonia at different pressures and temperatures. Does anyone know of a good reference to use? I have looked in the Langes Handbook of Chemistry and CRC, but am only finding viscosity at atmospheric pressure. I am looking for the viscosity of ammonia at...
