njslim
Graduate Poster
- Joined
- May 30, 2006
- Messages
- 1,077
FDNY has several high pressure pumpers using triple stage pumps (most
apparatus use two stage or even single) - Engine 6 "CHINATOWN TIGERS"
was one of these units (have the memorial T shirt listing the members who
died on 9/11) The high pressure pumpers are designed to tie into the sprinkler/standpipe systems to boost the pressure in these systems. High rise buildings (and many smaller buildings) have fire pumps in their mechanical
rooms to pump water into the sprinkers and stairway standpipes. Most fire
hoses (2 1/2 - 3" diameter) are rated at 400 psi working pressures - NFPA
regs require that all hose carried be tested annually (bitch of a job!). I
believe we still carry some hose rated at 600 psi. Because many apparatus
now carry large diameter (4 - 5") which can carry greater volumes of water
at lower pressures the need for high pressure hoses for long hose lays at
high pressure to maximize water volumes is diminished. FF for operations in
large or tall structures carry high rise kits of rolled hose ("donuts" or in FDNY
speak "rollups") 2 1/2" hose, which is what FDNY uses for high rise comes
normally in 50 ft lenghts (can get smaller). High rise kits also contain tools
(hose wrenches, couplers for differing thread gauges or genders (male-male,
female-female couplers) . The fires in the 78th floor sky lobby described by
Chief Palmer even if crews could reach would not know if water was available
to fight - assuming that pipes are intact and water supply from tanks above
is available. As other posters have demonstrated pumping water from street
would need pressures over 400psi just to overcome gravity "head" pressure
(.445 psi per foot).
apparatus use two stage or even single) - Engine 6 "CHINATOWN TIGERS"
was one of these units (have the memorial T shirt listing the members who
died on 9/11) The high pressure pumpers are designed to tie into the sprinkler/standpipe systems to boost the pressure in these systems. High rise buildings (and many smaller buildings) have fire pumps in their mechanical
rooms to pump water into the sprinkers and stairway standpipes. Most fire
hoses (2 1/2 - 3" diameter) are rated at 400 psi working pressures - NFPA
regs require that all hose carried be tested annually (bitch of a job!). I
believe we still carry some hose rated at 600 psi. Because many apparatus
now carry large diameter (4 - 5") which can carry greater volumes of water
at lower pressures the need for high pressure hoses for long hose lays at
high pressure to maximize water volumes is diminished. FF for operations in
large or tall structures carry high rise kits of rolled hose ("donuts" or in FDNY
speak "rollups") 2 1/2" hose, which is what FDNY uses for high rise comes
normally in 50 ft lenghts (can get smaller). High rise kits also contain tools
(hose wrenches, couplers for differing thread gauges or genders (male-male,
female-female couplers) . The fires in the 78th floor sky lobby described by
Chief Palmer even if crews could reach would not know if water was available
to fight - assuming that pipes are intact and water supply from tanks above
is available. As other posters have demonstrated pumping water from street
would need pressures over 400psi just to overcome gravity "head" pressure
(.445 psi per foot).
And Dylan's sitting on this proof until he can get a studio to pay for a cinema release...you'd think he'd want to release it sooner so we can remove those he's proved to be mass murderers from government more quickly. Oh well, he's got to pay the bills somehow, I guess.
