CRJ900
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Recirculating Lavatory = Blue Water?

Sun Jun 13, 2004 11:57 pm

The GECAS homepage states in its Bombardier aircraft fact sheet that CRJ200/700/900 all have recirculating lavatories.

I remember from flying 727s and 737s in the 1980s the blue flushing water, but I cannot remember any blue water when I flew Austrian/Tyrolean's CRJ200 two years ago.

Question: is blue water still being used in factory-fresh CRJs or have they developed a new type of flushing water that is colourless?

Anyone who knows?

Ivan

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airplay
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RE: Recirculating Lavatory = Blue Water?

Mon Jun 14, 2004 12:05 am

Recirculating lavatory systems reuse the flushing fluid (blue or otherwise). Ther is a "solids" separator that removes the chunks before recirculating.

The same fluid is used over until the next service stop. This prevents running out of flushing fluid like some older designs.

One of my most unpleasant experiences is being on a charter flight (free booze) and having the flush water run out. Needless to say, the "mountain" formed in the toilet bowl was disgusting....

 
LineMechQX
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RE: Recirculating Lavatory = Blue Water?

Mon Jun 14, 2004 12:29 am

Horizon's CRJ700's come straight from the factory with recirculating blue juice lavs. Same with brand new Q400's. Whether or not there's a colorless "blue" juice out there or not I couldn't say. But because it recirculates I wouldn't imagine it would take long for it to reach a pretty disgusting color. So it seems blue is a pretty popular color for lavs, airplanes or not.

Late
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EMBQA
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RE: Recirculating Lavatory = Blue Water?

Mon Jun 14, 2004 12:34 am

I wouldn't imagine it would take long for it to reach a pretty disgusting color.....and wonderful oder....!!!
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airplay
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RE: Recirculating Lavatory = Blue Water?

Mon Jun 14, 2004 1:11 am

Odor is OK...color? Can you imagine a brownish blue with green highlights?

 Smile
 
FedExIndy
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RE: Recirculating Lavatory = Blue Water?

Mon Jun 21, 2004 10:13 pm

The newer planes use potable water and suction to flush the waste into the tanks. The blue juice is just used in the tank to keep the crap from sticking to the tank.
 
ismangun
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RE: Recirculating Lavatory = Blue Water?

Sat Jun 26, 2004 3:09 pm

737s don't recirculate their water supply. That blue-thing the F/As used to call Sani-Blue.
If it's an Airbus, I'll take the bus
 
fadec
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RE: Recirculating Lavatory = Blue Water?

Sat Jun 26, 2004 4:42 pm

It all depends if they use a vacuum system or not. If not they are all recirculated blue juice. Everything is held just under the toilet in a storage tank.

The vacuum systems use potable water with a small amount of blue juice in the tank as a "pre-charge". These vacuum systems allow them to remotely locate the tank(s), normally in the aft section.
 
ismangun
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RE: Recirculating Lavatory = Blue Water?

Sat Jun 26, 2004 5:16 pm

That's why you don't want to use the lavatories after a barrel roll in a 737.  Smile/happy/getting dizzy
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smcmac32msn
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RE: Recirculating Lavatory = Blue Water?

Mon Jul 05, 2004 7:13 am

One of my most unpleasant experiences is being on a charter flight (free booze) and having the flush water run out. Needless to say, the "mountain" formed in the toilet bowl was disgusting....

My worst experience is dumping a MQ lav @ MSN and finding out the lav cart wasn't dumped in a while and the only thing keeping the "juice" from free-flowing across the ramp is the hose its sitting in.

Can you imagine a brownish blue with green highlights?

Seen that too! Was on a SEA-ORD flight and just under an hour into the flight, I had to use the lav and when I flushed, it came out smelling like an ammonia bomb had been dropped in the lav. It was a nasty shade of green/brown.
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bluejuice
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RE: Recirculating Lavatory = Blue Water?

Tue Oct 05, 2010 10:33 pm

Nothing new to contribute to this thread. Just figured the subject matter required me to at least check-in.
 
474218
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RE: Recirculating Lavatory = Blue Water?

Wed Oct 06, 2010 11:56 am

Quoting Fadec (Reply 7):
These vacuum systems allow them to remotely locate the tank(s), normally in the aft section.


The tanks on recirculating systems can also be remotely located. In addition there are self contained units where the tank is directly under the bowl.

Quoting Linemechqx (Reply 2):
But because it recirculates I wouldn't imagine it would take long for it to reach a pretty disgusting color. So it seems blue is a pretty popular color for lavs, airplanes or not.


The fluid is recirculated by units electric motors called "flush motor pumps" the pumps are equipped with cutters and filters so only liquid is pumped through the bowl.

The "blue juice" is used to further break down the solids and provide a more pleasant odor.

I did my time working Chapter 38 and like they say: "Its a shitty job but someone has to do it."
 
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HAWK21M
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RE: Recirculating Lavatory = Blue Water?

Thu Oct 07, 2010 7:17 pm

Quoting EMBQA (Reply 3):
I wouldn't imagine it would take long for it to reach a pretty disgusting color.....and wonderful oder....!!!

Thats where DDD [Dye, Disinfectant,Deodrant] comes into action.
Although if the contents have not been scheduled serviced,then that too would be ineffective.
regds
MEL.
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CRJ900
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RE: Recirculating Lavatory = Blue Water?

Sat Oct 09, 2010 9:05 pm

I have read that one big issue with recirculating lavatories were corrosion over time. Is this still an issue on newly delivered aircraft or are new-built lavatory modules a lot better than the ones installed in the 1980s/1990s?
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474218
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RE: Recirculating Lavatory = Blue Water?

Sat Oct 09, 2010 10:52 pm

Quoting CRJ900 (Reply 13):
I have read that one big issue with recirculating lavatories were corrosion over time. Is this still an issue on newly delivered aircraft or are new-built lavatory modules a lot better than the ones installed in the 1980s/1990s?


Laboratory corrosion is a problem with either type of toilet. Urine causes aluminum to corrode very quickly. However, because the recirculating uses a lot of fluid and the fluid contains urine, leaks in the pipes, lines or tanks can cause major corrosion problems if not discovered and cleaned up quickly.
 
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HAWK21M
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RE: Recirculating Lavatory = Blue Water?

Sun Oct 10, 2010 1:48 pm

Quoting 474218 (Reply 14):

Corrosion issues are due to liquid seepage out of the tank/lines & thru the mylar sheet affecting the Structure below.
Avoid liquids in that zone,reduce corrosion.
regds
MEL.
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contrails15
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RE: Recirculating Lavatory = Blue Water?

Mon Oct 11, 2010 9:01 pm

Don't know if this is true or not but someone told me that some airlines don't even use "blue juice" as my airline calls it. Air India I remember him saying and a couple others. This true?
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474218
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RE: Recirculating Lavatory = Blue Water?

Fri Oct 15, 2010 7:05 pm

I was looking through some old pictures I had taken over the years. Thought some of you may want to see what a "blue water" tank looks like. This is Eastern L-1011 N303EA (s/n 1004) picture was taken during an return off lease inspection around 1989 in Las Vegas.

Just to the left of center you can see how the aft pressure bulkhead has been stained by a spill of "blue water".


 
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HAWK21M
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RE: Recirculating Lavatory = Blue Water?

Sun Oct 17, 2010 10:45 am

Quoting contrails15 (Reply 16):
Air India I remember him saying and a couple others. This true?

Air India uses DDD [Dye/Disinfectant/Deodrant].
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
Skydrol
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RE: Recirculating Lavatory = Blue Water?

Wed Oct 20, 2010 2:29 am

Quoting 474218 (Reply 17):
I was looking through some old pictures I had taken over the years. Thought some of you may want to see what a "blue water" tank looks like. This is Eastern L-1011 N303EA (s/n 1004) picture was taken during an return off lease inspection around 1989 in Las Vegas.

Just to the left of center you can see how the aft pressure bulkhead has been stained by a spill of "blue water".

Amazing photo!!! Please, please say you have more L-1011 photos like this in an album on Airliners, Photobucket etc.!


Was the L-1011 unique in using this recirculating toilet system where the 5 aft toilets shared a common sewage tank with 3 flush pumps operating sequentially? Most airplanes with recirculating toilets have a simple design with each toilet bowl located on top of its own sewage tank (like a porta-potty), but with a flush pump inside. Although not using vacuum, the L-1011 toilet system is structured similar to a modern vacuum toilet system.



LD4
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474218
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RE: Recirculating Lavatory = Blue Water?

Wed Oct 20, 2010 4:00 am

Quoting Skydrol (Reply 19):
Amazing photo!!! Please, please say you have more L-1011 photos like this in an album on Airliners, Photobucket etc.!
LD4


Glad you like the picture: I have several hundred others. Nothing posted anywhere but maybe one of these day? I just bought a scanner that will allow me to put the negatives on a SD cards so it should be easier than scanning the actual photo.
 
CRJ900
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RE: Recirculating Lavatory = Blue Water?

Wed Oct 20, 2010 9:04 am

Quoting Skydrol (Reply 19):
Most airplanes with recirculating toilets have a simple design with each toilet bowl located on top of its own sewage tank (like a porta-potty), but with a flush pump inside

But are they connected with a hose or pipe to one point where the lav truck empties everything? I have never seen a lav truck hook up at three points on the B733...
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Skydrol
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RE: Recirculating Lavatory = Blue Water?

Thu Oct 21, 2010 4:03 am

Quoting CRJ900 (Reply 21):
But are they connected with a hose or pipe to one point where the lav truck empties everything? I have never seen a lav truck hook up at three points on the B733...

Yes, it would be something like this.

In the case of the B747-100, there were I believe, three lav service connection points, forward, mid and aft. Inside each service panel there were four valve handles, and one drain connection. This would allow servicing four toilet tanks from each panel (the aft panel may have served six toilets, and the forward panel included the upper deck toilet). I believe the blue pre-charge could be added to each of the toilet tanks as well from the service panels.

Although it has been years since I have seen this, so maybe my memory has failed.... hopefully someone can approve or disapprove my comments.




LD4
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FlyingColours
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RE: Recirculating Lavatory = Blue Water?

Sat Oct 23, 2010 8:18 am

Quoting BlueJuice (Reply 10):
Nothing new to contribute to this thread. Just figured the subject matter required me to at least check-in.

Lol

Quoting Ismangun (Reply 6):
737s don't recirculate their water supply. That blue-thing the F/As used to call Sani-Blue.

What do you mean? The 737-400s which I worked on had the recirculation system where the lav is located above the tank, basically like a potable toilet, occasionally an engineer would give us the "toilet teabag" to drop down them downroute, the only thing I remember about them is you do not want to get it on your clothing as it will NOT come out - I didn't dye my clothes but someone else did... The 737-800s and 900s have the pneumatic system, as does the 737-700 and 600 is suppose.

Quoting Skydrol (Reply 22):
Quoting CRJ900 (Reply 21):
But are they connected with a hose or pipe to one point where the lav truck empties everything? I have never seen a lav truck hook up at three points on the B733...

Yes, it would be something like this.

In the case of the B747-100, there were I believe, three lav service connection points, forward, mid and aft. Inside each service panel there were four valve handles, and one drain connection. This would allow servicing four toilet tanks from each panel (the aft panel may have served six toilets, and the forward panel included the upper deck toilet). I believe the blue pre-charge could be added to each of the toilet tanks as well from the service panels.

Although it has been years since I have seen this, so maybe my memory has failed.... hopefully someone can approve or disapprove my comments.


On the 737-400 I believe there were two panels, one at the front for the forward lavatory and one at the rear for the aft lavatories, the aft one could access both rear toilet tanks.

On the 757-200 we had various lavatory configurations, 2F 2M, 1F 3M, 1F 2M (F - FWD, M - MID) but I believe the access panels were 1 FWD and 1 MID, the Middle one accessing all of the middle lavatories. I could be wrong on this though as it has been nearly 5 years now since I was on the 757. Of course some of our other models had the newer Pneumatic system.

Excellent picture there 474218  

Phil
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iairallie
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RE: Recirculating Lavatory = Blue Water?

Mon Oct 25, 2010 5:36 pm

Quoting Airplay (Reply 4):
Odor is OK...color? Can you imagine a brownish blue with green highlights?


I don't have to imagine it I've seen it more times than I can count on the DC-10. DC-10 lavs at my company have been so bad I've actually vomited on several occasions.
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