Favorites Post #96
Originally posted November 16, 2013:
Most of us have watched the Alfred Hitchcock Thriller “The Birds” at least once in their life. When I was young it used to come on TV around Thanksgiving about the same time that Wizard of Oz would rerun. What a mix of movies to watch after eating turkey in one of our Italian relative’s house in Kansas City as I was growing up. During those years of sitting passively by watching the birds gang up on the humans, it never occurred to me that some day I might take part in my own private version of “Blackbird Wars” amid the playground equipment found in a typical Coal-fired Power Plant in North Central Oklahoma.
A tale like this is best starts out with the line, “It was a cold and windy night…” That was close. My story begins with, “It was a dark and cold winter morning…” Unit 1 was on overhaul. That meant that it was offline while we climbed inside the inner workings of the boiler, precipitator, Turbine and Generator in order to perform routine yearly maintenance. Being on overhaul also meant that we came to work earlier in the morning and we left later in the evening. Since it was in the middle of the winter, it also meant that we came to work in the dark, and we left for home in the dark…. These were dark times at the Power Plant for those of us on long shifts.
At this time in my career I was working on Unit 1 precipitator by myself. I had my own agenda on what needed to be done. Sometimes I would have contractors working with me, but for some reason, we had decided that we didn’t need them for this overhaul. Maybe because it was an extra long one and I would have plenty of time to complete my work before it was over.
I can remember grabbing my tool bucket and heading for the precipitator roof to begin my day of calibrating vibrators and checking rappers to make sure they were operating correctly. I was wearing my winter coat over my coveralls because it was cold outside. In Oklahoma, 20 degrees was pretty cold. 20 degrees in Oklahoma with 30 mile an hour winds gives you a pretty low wind chill…. which chills you to the bone.
I had a red stocking liner on my hardhat that wrapped around my forehead that kept my head warm.
All bundled up, I left the shop through the Turbine Room basement and headed toward the breezeway between Unit 1 and 2. I climbed the stairs up the Surge Bin Tower until I had reached the landing where you can go to either Unit 1 or 2 precipitator roofs. Using rote memory after having performed this same task every morning for the past month and a half, I turned toward Unit 1.
The Precipitator is a big box that takes the ash out of the exhaust from boiler. It drops the ash into hoppers where it is transported to the coal yard into large silos, where trucks haul it away to make concrete for roads and buildings. The precipitator roof is full of large transformers (84 of them), 168 vibrators that shake the 29,568 high voltage wires in the precipitator, and 672 rappers that bang on the 7,560 metal plates. The transformers are used to collect the ash using “static cling”. The rappers and vibrators are used to knock the ash into the hoppers.
The Precipitator roof is a very noisy place when all the rappers and vibrators are running. It is covered with a sheet metal roof. It wasn’t originally designed that way, but someone with foresight thought that it would be a great idea to insulate the precipitator roof. In doing so, they needed to add a roof to keep the insulation from being exposed to the weather.
It wasn’t noisy that morning as I reached the ladder and quickly tied my tool bucket to a rope hanging down from above. It was dark, and lonely and quiet. Well. There were some lights, but this morning, the light from the precipitator didn’t seem to shine much as I pulled myself up the ladder. When I reached the top I turned around and sat at the top of the ladder and began pulling my tool bucket up.
It was at that moment when I realized that something was much different than usual. I had spent a couple of years working on the precipitator roof and inside and I had become friends with each of the transformers, and I even knew the unique sounds of each of the vibrators. I could tell when a rapper wasn’t rapping correctly. There would be a slight sucking sound as the rapper was drawn up into the cylinder…. There was a slight pause, then it would drop onto an anvil that was connected to the plate rack. But this morning everything was turned off. Yet, I could feel that there was something wrong.
There was a strange hum. I was trying to place it as I grabbed each foot of rope and pulled my bucket closer. There was more than a hum… There was a weird muffled sound all around. I had a chill down my back as if I was being watched. I quickly grabbed the handle of the bucket and stood up and turned around. I was ready to spot whoever it was that was spying on me!
What I saw immediately sucked the breath out of me. The precipitator is 200 feet wide and 120 feet long. Every inch as far as I could see was black. Not just the equipment, but the air itself.
During the night a cold wave had moved into Oklahoma from the north. With it, it had brought a horde of blackbirds. Thousands upon thousands of them. They had found refuge from the cold blasting wind in the precipitator roof enclosure. Safe and warm and undisturbed….. That is, until I arrived.
It was as if the blackbirds had discovered me at the same time I had found them. They suddenly burst into a frenzy.
I stood there in wonder for a few moments watching the swirling mass of blackness obscuring what little light was given off by the 100 watt Mercury Vapor lights. As I began to move toward the walkway the flying mass of feathers parted so that the birds kept a safe distance from me. As I grabbed the rungs of the ladder, I suddenly realized why keeping an aviary at a Power Plant is not a good idea. A warm moist gooey mass squished between my fingers as I pulled myself up the ladder and onto the walkway.
I took a few steps to where a package of WypAlls was laying on the walkway and pulled out a couple of heavy duty sheets of durable wiping material:
I decided that I was going to try to chase the birds out of the shelter so I began waving a couple of rags around as I walked down the walkway. All it did was cause the birds to bunch up in corners away from me. They would circle back around behind me. So, when I reached the other end of the roof, I climbed down to one of the rapper control cabinets and powered it up.
The rappers and vibrators began their music. A medley of humming and clanking. I went to each of the 14 cabinets on the roof turning on each of them until the entire roof had risen to a symphony of buzzing and banging. Music to my ears. After wiping down a few places where I needed to work, I spent some time testing and taking notes so that I could make adjustments in the control cabinet after I had made my way around each rapper and vibrator in that area. Then I left for break.
The sun was now up and daylight was shining through the openings in the precipitator roof. When I returned from break the hoard of blackbirds had decided to continue their journey south.
There was one time when I was working as an electrician at the Power Plant where I felt close to being a bird myself. It was when I had to travel to the top of the 500 foot smoke stack to repair some equipment. I was not only at the top of the smokestack, but I was literally sitting on the edge of it and shimming my way around it.
Why me? Well. Our A Foreman, Bill Bennett summed it up like this…. “Have Kevin do it. He likes heights.” Sure. Just like he said I liked to get dirty, so put me in a coal bin to fix a proximity switch. Or, just like he said that I liked climbing in holes in the ground, so I was assigned the job of fixing all the manhole pumps at the plant. What could I say? At some point, he was right. I couldn’t argue with him. Especially since he would call me a “scamp” with such endearment (See the post “Tales of a Tall Power Plant A Foreman“).
Well. You learn something new every day when working at a power plant, and I sure learned something that day. Quite a few things. I already knew that inside the tall concrete smoke stack was another smoke stack made out of brick. The outer stack would sway in the strong Oklahoma wind, while the brick stack inside would remain steady. On a windy day, at the very top, the stack would sway as much as six inches.
On this particular day I rode on top of the stack elevator to the top so that I could climb up onto the rim where the lightning rods were placed about 6 feet apart around the top.
When the wind is blowing there is a certain amount of a difference in the electric potential at the top of the stack as there is on the ground, so you could hear a slight crackling sound around the lightning rods even though it was a clear sunny day. I was wearing a safety belt and as I stopped to work, I would clip the lanyard to the closest lightning rod knowing full well that if I decided to jump off the stack, the lightning rod would just bend and the lanyard would just slide off the end.
I was not in any mood to do any jumping that day. I was there to fix jumpers instead. You see, there is a metal cap on the top rim of the smoke stack. Actually, there is a metal rim on the top of both smoke stacks. The concrete one and the brick stack inside the concrete stack. And there was supposed to be a set of jumpers around the top of the stacks connecting the two metal caps together electrically. This way, if perchance a bolt of lightning hit the inside stack, then the electricity would be routed to the outer rim and down the large grounding cables to the ground grid 500 feet below.
As I shimmied around the top of the stack, I became aware that as far as I could see… clear to the horizon, there wasn’t anything higher than me. At first this threw me a little off balance, because I usually focused on other objects to help me keep my bearings. In this case, only the other smoke stack was as high as me. So, I focused on the rim where I was sitting and tried as hard as I could to ignore the fact that I was a tenth of a mile up in the air.
I removed the broken jumpers and replaced them with the new ones. I didn’t think these new jumpers would last long considering that as the stack swayed back and forth, it would quickly wear the jumpers in two. But, there was some regulation or something that said they had to be replaced, and so that was why I was there.
I noticed while I was working on the top of the stack that birds were flying around below me. Actually, most of them were way below me. Few birds would fly as high as the stacks, and they were usually the predatory types that liked to swoop down on unsuspecting pigeons below. It felt a little odd to be working and looking down at birds flying when it is so normal to look up to see birds. From up there, a large flock of birds like those in “The Birds” by Alfred Hitchcock didn’t look so intimidating. They were nothing but small dots far below.