Long Lines: The 350'
HTML-код
- Опубликовано: 6 фев 2025
- In this video, Kevin discusses our 350' attack line off of Engine 1 including some of the important details about the line and nozzle itself, how to pull the attack line, and goes over the steps to pack the line. Remember, if you have any questions on the video, ask Kevin or another officer.
Хобби
Very interesting. I know the key hose and smooth bore knob go a long way to reduce friction loss, but have you tried making the dead load 2.5” to reduce friction loss further?
Cool Video mate!
certainly looks interesting. i want to learn more about your hose loads. does the additional length not cause any issues when not completely stretched (wrinkling, twisting, not getting enough water trough)? what happens if you need to make it longer? what happens if you want to have a second nozzle on the end of the line? do you have to get another separate line all the way from the truck?
We spec'd out this engine a specific way due to the nature of our first due. We have some smaller residences 5-10 ft off of the street, some average sized houses 30 ft off the street, and some very large houses anywhere from 50 to hundreds of feet off the street. This would go into the engine officer's decision making when it comes to which line to pull, and if we pull our 350' line, we would be a good bit a way from our ingress point to the fire, and be utilizing 250+ ft solely stretching to that ingress.
If we need more than 350 feet of hose, we have a few options. We could use a leader-line style which would easily give us 400' between our 250' of 2.5" into 150' of our 1 3/4" apt. pack -- or we could utilize an additional 75' section of 1 3/4" apartment pack onto the end of our 350' line to give us 425' at the minimum. The decision would be made by the officer of the engine on which pack would work best for the scenario.
Im guessing your pump pressure to be around 155 PSI for a 350ft 13/4 lay. You would have 105 lbs friction loss in the hose plus 50 psi operating pressure for your tip giving you 160 GPM. For a 15/16 tip, 350ft lay you have to up pump pressure to 175 PSI. That would be about 125 lbs. friction loss and again 50 PSI for your nozzle pressure giving you 185 GPM. Do you REALLY need that long of hose? Maybe garden apartment set backs? Maybe go to 2" hose or 21/2 wyed to 1/34 attack line.
These are all good options. We have found that the 350' line is quicker to flake out compared to assembling and flaking out a leader line. Both are viable options and are in the tool box. Thanks for watching the video.
May I ask, how are your smaller/shorter firefighters able to safely unload and reload this 350 feet of hose?
The driver's initial job after doffing the engine would be to assist every firefighter in getting their hoseload on their shoulder. This should help firefighters of any size safely get the hose on their shoulder. Thank you for your question!
What are you pumping this at? I'm guessing close to 200psi. Having good hose certainly helps.
Yes, about 185. Thanks for watching the video.
Ridiculous.
Great input, thank you so much.