AirframeAS From United States of America, joined Feb 2004, 14150 posts, RR: 25 Reply 5, posted (9 years 8 months 1 week 6 days 14 hours ago) and read 6387 times:
On a B737, the potable water tank is in the aft cargo pit behind the last wall under the aft galley just right in front of the pressurized bulkhead. The tank itself is made out of composite materials and fiberglass. The tank is about 4 feet long and 2 feet tall, but I dont remember how much water the tank itself can hold. The 737s only have one potable water tank. In a c-check, the tank was very very hard to take out and put back in.
A Safe Flight Begins With Quality Maintenance On The Ground.
747Teach From United States of America, joined Nov 2000, 176 posts, RR: 1 Reply 9, posted (9 years 8 months 1 week 6 days 11 hours ago) and read 6255 times:
Jc5280: The 747 generally has the capacity of 330 gallons of potable water. This is held in three 110 gallon filament-wound fiberglass tanks attached to the forward side of the center section front spar (rear bulkhead of the forward baggage compartment). The water is moved from the tanks by pressurized air. This pressure is provided by electrically driven air compressors mounted next to the tanks. Not all operators use all three tanks. Depending on the length of the segments they intend to fly, some operators have deleted some of the tanks. 747 AMM, 38-11-00, page 1, pg 2. Regards,
MD11Engineer From Germany, joined Oct 2003, 13599 posts, RR: 63 Reply 12, posted (9 years 8 months 1 week 6 days 9 hours ago) and read 6160 times:
On the passenger MD-11 you can have up to four 63 USG tanks, the freighter usally has all removed exept for one. Mind that this water also serves for flushing the vacuum toilets if installed. The tanks sit in the utility tunnels (behind the sidewall) of the forward cargo compartment.
Here the water used for servicing is usually chlorinated potable water, but you´ll never know who services the tank down line. Usually the galleys contain an antibiological filter (AFIAK it contains silver ions) for the taps and coffee makers, which get changed regularely. Also the tanks will be desinfected every few weeks, normaly during an A-check.
DalMD88 From United States of America, joined Jul 2000, 2442 posts, RR: 15 Reply 13, posted (9 years 8 months 1 week 6 days 8 hours ago) and read 6119 times:
Not all 737 have the tank in the aft. Our -200 have them mounted in the fwd pit on the left wall. As for the quality of the water, I wouldn't drink out of one of those tanks. I do drink the coffee since the water gets boiled first.
The MD88/90, 732/733, and MD11 have the potable water tank(s) in the forward fuselage. The other aircraft have the tank(s) in the aft fuselage. The MD11, 764, and 777 have two tanks while the rest of the fleet has only one. As stated in a previous post, the aircraft with vacuum lavatories have a larger water capacity since it is also used to flush the toilets.
It is standard practice to service the potable water as part of the ground servicing but in practice it is only done on RON aircraft and as needed during the day. With international flights, the water is always topped off and it is a high priority item. Most captains will not leave on an international flight unless their potable water is full. I am not 100% sure but I believe this is due to the fact that the local water is unreliable in some parts of the world and they want enough for the return trip if necessary. Also, after fuel, engine oil, and hydraulic fluid, water is the most vital operating fluid on an aircraft and has caused aircraft to divert if it malfunctions.
I hope this information helps. Regards.
"I love mankind. It's people I can't stand." - Charles Shultz
Atlamt From United States of America, joined Sep 2001, 240 posts, RR: 3 Reply 15, posted (9 years 8 months 1 week 5 days 9 hours ago) and read 5855 times:
I wouldn't drink the water, even the coffee. The coffee makers don't actually boil the water they just heat it up. Remember that at altitude the pressure in the cabin is less than on the ground so water will boil at a lot less than 212F.
Srbmod From United States of America, joined Mar 2001, 17271 posts, RR: 51 Reply 16, posted (9 years 8 months 1 week 4 days 21 hours ago) and read 5766 times:
I remember the potable water trucks @ FL @ ATL back when I worked there, they were some beat-up light pickup trucks with an agricultural tank mounted in the truck bed, with a pump and hose mounted where the passenger seat used to be. We filled it from a tap, but no telling how long that truck would sit out in the sun........ Same could be said of any potable water truck.
Refueler1974 From United States of America, joined Mar 2004, 235 posts, RR: 0 Reply 17, posted (9 years 8 months 1 week 1 day 1 hour ago) and read 5603 times:
I would rather have the potable water truck instead of the setup we have. All we have are 5 gallon Kentwood water bottles and a portable pump that has a long plastic tube on one end (this sticks into the top of the water bottle) and a line that connects to the aircraft. We then connect the pump to the battery of whatever vehicle we are in, and away we go!! Believe me...it takes a while to pump 50 or so gallons of water using this system.....but it is all we have for now! One of these days we might get to graduate up to having a "real" water truck......LOL
The only time you have too much fuel is when you're on fire.
Prebennorholm From Denmark, joined Mar 2000, 6125 posts, RR: 55 Reply 20, posted (9 years 8 months 6 days 2 hours ago) and read 5351 times:
Alessandro: Would it be possible to take water from humid air that goes into the aircondition?
No, that doesn't work.
We all know the water running from the aircon in our car, but in an airliner the situation is quite different.
The aircon in our car cools hot and humid air. The airliner heats dry air. In fact very cold and therefore VERY dry air.
After some time at cruising altitude the relative humidity is often as low as 5% in an airliner cabin and on very long flight that's sort of a problem to some people. Normal livingroom humidity is most comfu around 50% or so. Flying 10 or 15 hours, be sure that you drink enough, or you may suffer slightly from dehydration.
If you go and buy one of the very long range Gulfstream biz jets, then you have the option to invest in a special aircon system which ADDS water to the cabin air for comfort reasons. I don't have the figures available, but it takes a lot of water from a quite substantial tank to raise the cabin air humidity from 5% to just 25-30% during a 15 hours flight. And of course it has to be distilled water.
Happy landing, Preben Norholm
Always keep your number of landings equal to your number of take-offs, Preben Norholm
Prebennorholm From Denmark, joined Mar 2000, 6125 posts, RR: 55 Reply 23, posted (9 years 8 months 5 days 4 hours ago) and read 5223 times:
But the space crafts or space stations are an entirely different animals. They have to recycle the atmosphere, constantly add oxygen and remove vapor from sweat etc. And somehow the crew gets used to live with the rest which soon becomes a rather smelly stuff.
In an airliner we constantly renew the cabin air with fresh air from outside. And at 30 or 40,000 feet the air happens to be extremely dry.
It would be possible to extract some of the little water which comes with the air. But it would be very costly in energy to do so. It might end up spending more fuel than the water it produced.
To extract water you have to cool the air below the dew point. At cruising altitude the temperature is something like minus 50 deg. C or colder. And the dew point is much lower. You would probably have to cool enormous amounts of air to minus 100 deg. C to extract some of the very little water there is.
So for all practical reasons, it is not possible.
Always keep your number of landings equal to your number of take-offs, Preben Norholm
Alessandro From , joined Dec 1969, posts, RR: Reply 24, posted (9 years 8 months 4 days 17 hours ago) and read 5173 times:
Preben, I don´t believe that, too expensive to get new air from the outside all the time, I think the ventilation recycle the air (which was the problem with SARS and other airborne diseases) in a big commercial passengerplane because it´s too expensive to heat (also not so much oxygen in the air at higher altitude).
Perhaps you only got experience with biz-jets which got a different economical
situation than as an example B747?
[Edited 2004-04-07 09:44:45]
25 Liamksa: I think the ventilation recycle the air (which was the problem with SARS and other airborne diseases) in a big commercial passengerplane because it´s
26 MxCtrlr: I think the ventilation recycle the air (which was the problem with SARS and other airborne diseases) in a big commercial passengerplane because it´s