Tue, 6 Nov 2012|
Mike Wilbur shows how to reposition the angle of a nozzle on an aerial device to perform a hydraulic trench cut. He also discusses safety issues and manual repositioning of the nozzle.
[MUSIC] Hi, I'm Mike Wilbur. Welcome to Fire Engineering Training Minutes. in our last segment if you recall we were using a aerial scope tower as an offensive weapon at a row of strip mall store type occupancies. In this segment, we're going to take a pre-pipe water way aerial ladder and we're going to try to use it in the same fashion. Okay, again this is trying to take this particular nozzle and what we're going to try and do is cut an inverted trench. In this building and put like a holding, a defensive post here and push the fire back onto itself and prevent the spread of this fire going through the whole row of stores. But with that said we have a couple of operational challenges. One is, is that my son Nick is going to take. And operate the nozzle. And we're going to try to get it to, go up a little bit more. And as you can see, the nozzle stopped. This is as far as the nozzle will go, go up. I learned a little while ago, and purely by accident in the city of Fort Worth, that here, on the apparatus. Are a series of what they look like are bolt heads. The apparatus industry, the nozzle industry call these pins. And I was able to obtain out of the city of Fort Worth from one of them nozzle manufacturers what we call a pin chart. And in this particular pin chart from Elkhart Press. It gives 47 different configurations that you can set the pins, and it changes the travel pattern on the nozzle. So, that can be done in most cases. But what you need to do before you do this in your home department. Is to check with your apparatus manufacture or your sales facility. To make sure that it's okay for your particular unit. You want to check with engineering and get the okay. I've dealt with several of the manufacturers over the years. We've gone back to them with this particular request and we've never been denied. The one particular manufacturer when we went to do this the only thing they said is please don't have anybody at the tip. Flowing water when you're going to use the nozzle at an angle like that, and of course, we're not going to have anybody at the tip for this evolution at all, what we're going to do with this fire is we're going to take this glass out and then we're going to push the nozzle assembly in, we'll have the nozzle assembly. Cant it at an angle to get up into the **** loft to create this, this trench. We're going to use this water, this reach of stream and we're going to create a hydraulic trench and we're going to stop the spread of this fire. One of the other things I'd like to point out about this assembly is the fact what do you do. If this assembly the electrical power to the assembly fails. And it could, could happen, it's happened on different occasions. There's a couple of different ways to overcome. And each nozzle manufacturer has their own little trick. With this particular nozzle manufacturer. What they've done is that they've given us a wrench. And on the other side, on Nick's side, we're going to hand him the wrench. And he will be able to torque on some bolts over there, and he will be able to get this nozzle assembly to move without electric. It takes a little while, we're doing it manually what electric does, but. It still works just fine thanks Nick okay one last point to be made here just as the evolution with the tower ladder having to have stacked hips it's imperative in this evolution with this truck that again we have to have stacked hips we are really looking for a lot of reach and penetration in the stream. The other thing that comes into play here, if we were to take and have a fog combination type nozzle, the orifice on that nozzle is very, very big. And we would not be able to get enough angle on that nozzle because of the diameter of the nozzle, to be able to get that angle to get the water up in the **** loft. To do any kind of sufficient good. And so, we really need to have, our, our stack tips again, for this particular evolution. Again, this requires a minimal amount of manpower. We're taking a very expensive piece of equipment, and we're getting the most out of it. Using as few people as possible I mean this is short handed fire fighting really at it's best here great for a day time fire with not a lot of people showing up and you can use this it's a great offensive weapon. You'll be able to save a lot of property with this particular evolution. This is Mike Wilbur for Fire Engineering training minutes. We'll see you next time. [MUSIC]