Is this an academic question or does your department actually have a piercing nozzle?
They can be of benefit in car fires, they can be punched through masonry walls and they can be used for attic as well as basement fires. Overall, like any tool it has its appropriate applications. If your department does have one then it would make sense to take it out and practice with it. If you don't have one then it's more a question of need and expense.
We have one on one engine. We've never used it...yet.
We have them but the last time we used them was as an experiment on a barn fire...we were trying to put out one of those 700 lb round bales....Not much of a success but it did help.........
A piercing nozzle is like any other specialized tool. You may not need it very often but when you do nothing else works, or works as good. We have used ours at hay fires, and car fires. Main thing is practice with it and think of other places it COULD be useful.
back in the 50's, err... A while ago, he was in the Navy. And his M.O.S. was either a brigade member or some other suppression related job. that aside what they used was fog nozzles, since all the rooms were of course full metal, it was able to contain a fire inside the room of origin, all that was needed was to close the hatch and wait for the suppression team to get there.
How did they fight the fire?
They didn't really, at least not in the offensive interior actions we use today. It was Steam Conversion, they would stage at the door with the wide fog pattern crack the door and blast the fog, then shut the door and come back later to check on it.
Afterward when Lloyd left the service and continued with the fire service he made a different version of the fog nozzle.
getting carried away here...
The Piercing Nozzle works under that same premise the fog nozzle on the ships work, you shove it into the compartment and let the steam do your work for you.
maybe I'll Write out a thread on vehicle firefighting....
We have one....somewhere. We've played with it a few times. You'd better had eaten your Wheaties to use this 5' long 1 3/4 diameter monster. Wouldn't want to use it on an under-hood vehicle fire on today's vehicles though. Slam that puppy through the hood and into the engine block.
We pretty much consider it an ISORD. (ISO required device) Kinda like cellar nozzles. A cellar in my area is called an indoor swimming pool.
They work good on the older single wide mobile homes, also useful on tractor trailers if you know whats inside one before you slam it in. Like Oldman stated you've better of ate your Wheaties first.
Just my opinion, any fire that you use the piercing nozzle on will still need to be opened up and overhauled. So, put it away, open up the space, hood, wall etc. and put the fire out with your nozzle you use all the time. Our department bought one for every engine at the end of a year with budged left over, it seems to have been a waste of money. We have 13 engines and do not know of anyone every using one. I believe it is better for a department to ask the FF what tools they want and then buy what the workers want and need to do the job the department asks them to do. I ask the question, what do departments do that fight a lot of fire, (Camden, East St. Louis, Chicago, Detroit, FDNY, LA, Gary, Boston, etc.) what tools do they use to do a certain job. I ask this because they have the experience to say what works, and they have probably tried every new tool that has come along. My opinion of the piercing nozzle, it is a gimmick, a tool for salesmen to pull money out of your budget that could be used in a better way.