Pumping to a gated wye. - Firehouse Forums - Firefighting …
2001年8月12日 · Certainly the relief valve on the wye was set at 140 psi back at the station after field testing. If not shame on you! Using a wye without a relief puts the crew at big time risk. The 200 gpm flow through say 500 feet of 2 1/2" hose requires a pump discharge pressure of 190 psi. Two lines would require 320 and three you did say three way 500 psi.
NFPA 1410 Engine Company Drills - Firehouse Forums
2014年11月16日 · To achieve the recommended flow in the gated wye scenario some things would depend on the equipment your department uses in order to figure out the math. For my department we would be using 300' of 3" line to the gated wye, with a 150' of 1-3/4" for the attack line and 150' of 2-1/2" for the backup line, and combination nozzles on both lines.
Locking Gated Wye Handles - Firehouse Forums
2012年4月2日 · The reason that the gated wye is a concern to me is that when used in a horizontal standpipe the wye is not constantly manned. As the hose is dragged or as firefighers move past the wye there is a potential for it to be manipulated accidentally.
2 1/2 to 1 3/4 - Firehouse Forums - Firefighting Discussion
2008年7月23日 · We would not put a gated Wye on a 2-1/2 in hose. We consider the max flow of a 2-1/2 inch to be 300gpm, and the max flow on a 1-3/4 to be 200 each. Therefore, two 1-3/4 hand lines will theoretically outflow the 2-1/2 inch supply. We only use the gated Wye on a 3 inch to supply two 1-3/4 hand lines. But, that's just us. Your mileage will vary.
Water Thiefs and LDH Manifolds - Firehouse Forums
2004年8月24日 · We carry two LDH appliances on the rear step of our Engine, which carries 5000' 5" and has the primary mission of water supply. A Gated Wye and a Water Thief. The 5" Gated Wye is used when we're reverse laying from scene to water. From the wye one line is run to the Engine-Tank there. The second outlet is either unused, or is sent to the Ladder.
Tanker Fill Appliance - Draining LDH before disconnect
2008年2月18日 · Closes the valves on the gated wye; Re-opens the fill valve on the back of the tanker for a couple of seconds, then closes it again. By doing this, the access water and pressure between the gated wye and the tanker is bled into the tank, not only the personnel staffing the fill …
Crosslay Hose Loads - Firehouse Forums - Firefighting Discussion
1999年12月23日 · The nozzle and gated wye are strapped together. 1 FF pulls the wye and nozzle and goes. 1 FF then helps get the remaining 3" out of the tray (Which is minimal because it pulls easy)and then goes. The 1st FF DOEN'T drop the 1-3/4" until the 3" is layed out.
2 1/2 to 1 3/4 - Firehouse Forums - Firefighting Discussion
2008年7月29日 · Now. In theory 2 1 3/4" lines through the gated wye can outflow a 2 1/2" supply. Unless you restrict the flow of the 1 3/4. You restrict the flow to save the 2 1/2. Just because you can put 350 gpm through 2 1/2 doesn't mean it's good for the hose, couplings, pumper or your men that have to advance said hose
High Rise Packs/Hose - Firehouse Forums - Firefighting Discussion
2001年8月16日 · The friction loss of the standpipe should be calculated in by the D/O. The friction loss of a 4,5 or even 6 inch standpipe is very minimal compared to a leader line operation using a Gated Wye. You stated that the buildings are Mid-rise. The number of stories of the building as well are factors that the D/O is supposed to calculate for the TPL.
friction loss - Firehouse Forums - Firefighting Discussion
2008年7月24日 · In the R-6 Engine Academy this spring, they told us that the old 5psi/appliance friction loss is outdated. As kd7fds said.. the loss is minimal.. something like less than 0.5 psi in a gated wye. Also, the max flow thru 1.5" hose is about 100 gpm. That said, some better than GSA issued hose may perform slightly better, but the rule of thumb is ...