So when we look at my percentage of reliability, now I'm going to throw that other the red curve in there, okay? The closer I get to that best efficiency point, the more reliable my pump is going to become. And you notice I can go right or left, so that kind of answers my question. So where's a good place I can operate this pump at? So the answer to that question is I can operate anywhere between these two zones, left and right, and this pump is going to be a very reliable piece of equipment.
There you go. I just drew the blue line in there. The blue line is the working point of the impeller. So this would be 0 RPMs. This would be my selected RPMs based on whether I'm running on a VFD or I'm running at a constant speed. So that's always kind of fun, okay? So when we try to understand what my pump's door, this is one of my favorite pictures. I don't remember where the heck I got this thing, but I found it through somebody. And everybody can relate to swinging a baseball bat at a ball. And if you've ever slid through the plate, and somebody's delivering you a nice, say...well, I don't know if you can get there, but, you know, a Major League player getting a 90-mile-an-hour fastball, and it happens to hit him on the hands, that's going to hurt. That's going to cause some damage.
An operation below this point on the far-left hand side will result in damage. Now, you notice there on that same picture I got the pump curve itself, and I point my best efficiency point right here in what's called the sweet spot of the bat. Now, this area between the end of the handle where your hands go and the beginning of the large portion of the barrel of the bat, you'll notice in red it says there, "Vibration levels increased, reduced efficiency," all that kind of fun stuff. Higher maintenance costs. Oh, that's one of those industrial buzzwords, higher maintenance costs. And if you look down here on the lower portion of this drawing here, you see where it says, "Allowable operating region." That's that wide margin far to the right and far to the left of the sweet spot. So I like to tell people, "Hit the ball on the handle, on your knuckles it hurts. Hit the ball on the tube of the bat, you get a foul ball, pop up what some Major League Baseball players call duck snort, all that kind of fun stuff." And then you'll notice as we start to get into that allowable operating region over here.
This is my base hit. This might be my double. This might be my triple. And, of course, obviously if I hit on the sweet spot, it's a home run. And then it goes the other way, you know. Triple, double, base hit, foul ball. So I guess that's kind of explaining to you in simple ways of how a pump curve works. So all right. So here's my scenario of the who, what, why, where of pumps. Troubleshooting is an art. Troubleshooting is the ability to take in the atmosphere. What's this pump doing? What's this pump not doing? First you got to identify is the problem. Open loop, you got to find out what type of system it is. Open loop, closed loop, what kind of process, what does it do? Is it making noise? Is it leaking? Are the bearings growling at you? What's the pump not doing?
So the art of troubleshooting is being able to walk up to that pump and say, "Hey. What's going on here?" Okay? So put your hands in your pocket. What does it smell like? What does it look like? Okay? The next thing you got to do is you got to find the current pump information. So where do I find that? Is there a pump tag there? Do you have an information file? Does your equipment have an ID number? How is it identified at your location? You need to find that information so you can find that starting point. Are there any maintenance logs you keep on this? Is there any information that was recently added to this main log, maintenance log? Oh, yeah, you know, a couple days ago Joe was out here looking at this pump because the operator was complaining it as making noises. He didn't find any problems. So he just said, "You know, checked on it. No problem found. Back to work." Okay?