Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-30-2003, 11:59 AM   #1
Rivet Master
 
drboyd's Avatar

 
1978 25' Tradewind
Metro Phoenix , Arizona
Join Date: Jun 2003
Posts: 1,428
Question Black tank flush....

OK, I'm hearing about "black tank flush" as a (capital C) Cool Thing on the new Airstreams.

Sounds like something that runs water into the black tank to clean it out. Duh! Ain't I the bright one?!

So here's my idea - I've got a black tank drain on the left corner of the trailer, and a vent pipe coming out of the black tank on the right corner - the opposite side of the tank.

Seems to me like water put down the vent pipe would flow across the bottom of the tank and out the drain, carrying with it any solid matter.

So, where to get extra water? How about the grey water tank? Wouldn't it be possible to put the 12 volt RV version of a trash pump to draw out of the grey water tank (setting the pickup a couple of inches from the bottom, to avoid drawing big chunks of stuff into the pump) and pump it down the vent (thru a T fitting near the bottom of the vent) to flush out the black tank?

I'm sure this has been thought of before, and proven to be a Really Bad Idea, for several reasons. I'm just curious why!

Thanks!

Don
__________________

__________________
drboyd is offline   Reply With Quote
Old 07-30-2003, 12:10 PM   #2
Just a member
 
thenewkid64's Avatar
 
1978 28' Argosy 28
Tampa Bay , Florida
Join Date: Mar 2002
Posts: 4,539
Images: 21
Send a message via AIM to thenewkid64 Send a message via Yahoo to thenewkid64 Send a message via Skype™ to thenewkid64
The only reason I can think of is cost. A black tank flush system like is being installed is a $5.00 cost for parts and $20 labor cost to build it in. Who knows what the markup on it is. I do not think you really need a macerator pump. As long as you are using an impeller based pump anything that gets pulled in still gets shredded. A diaphram sytyle could get stuff stuck in the valves.

You solution sounds elegant, and should work as long as seal/mount/install it all with safety and stability in mind. I would not even worry about getting the fitting into the tank, just having it dump into the vent tube should work.

With all of that being said I would suggest some type of safety so the pump cannot move water into the black tank without the valve being open, or you not being aware. Maybe a headlight warning buzzer hooked to the power switch so you know it is on? There should be no need for a check valve as there is one in the pump.
__________________

__________________
Brett G
WBCCI #5501 AIR # 49
-------------------------
1978 Argosy 28 foot Motorhome

Wise men talk because they have something to say; fools, because they have to say something. -- Plato


thenewkid64 is offline   Reply With Quote
Old 07-30-2003, 12:22 PM   #3
Rivet Master
 
drboyd's Avatar

 
1978 25' Tradewind
Metro Phoenix , Arizona
Join Date: Jun 2003
Posts: 1,428
Or just a momentary switch...

...on the pump, so you have to keep your thumb on it to have it run....

"Your solution sounds elegant, ..." Blush! I'm so flattered! Thanks!
__________________
drboyd is offline   Reply With Quote
Old 07-30-2003, 04:10 PM   #4
Aluminut
 
Silvertwinkie's Avatar
 
2004 25' Safari
. , Illinois
Join Date: Feb 2003
Posts: 10,334
You know, what seems to work well for us is simply placing the chemicals in the tank the start to break down the stuff in there.

Then we purge that first and the grey tank next. At home, we have a sewer line poke through. I fill the tanks two times and flush them out completely.

Of course, you need a poke throught to make it work. The reason I did this was because most dump sites that I have been to don't have a threaded connector (which I thought the black flush used). Since I didn't want to drag a dumpstation hose through the Bambi, I figured I'd do it at home where I know where the hose has been and I can control some of the variables.

Eric
__________________
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91
Silvertwinkie is offline   Reply With Quote
Old 07-30-2003, 08:57 PM   #5
4 Rivet Member
 
WayWard Wind's Avatar
 
2004 25' Safari
Join Date: Jan 2003
Posts: 424
At the present time we are using a Flush King for our tanks. It appears to work very well & we avoid taking a fill hose in the trailer. The clear fitting allows one to see when the tanks are clean. I have been seriously considering to have a Black Water Flush added when we go to Jackson Center this Fall & talked today to A-S ( Rick ) regarding costs. It's now between the Flush or Fantastic Fan. Most likely it will be the fan, as I think the Flush King will do the "job". Also when talking to A-S today I tried to get from them what all ( meals, etc) is covered in the costs. They appeared to be REALLY unorganized for the event, as they had no idea what may be covered. They did however make a quick charge to the CC. Perhaps a Pig in the Poke?
Best,
__________________
Home of the Wayward Wind

Bogfrog & Mr. Turbo

If in life you stumble, make it part of the dance
WayWard Wind is offline   Reply With Quote
Old 07-31-2003, 07:24 AM   #6
Aluminut
 
Silvertwinkie's Avatar
 
2004 25' Safari
. , Illinois
Join Date: Feb 2003
Posts: 10,334
What was the cost of the flush? I also talked to Rick and got a ballpark on the Fantastic Fan (which for sure is going in-- I just don't know if I want two since the Bambi as poor cross ventilation.

Eric
__________________
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91
Silvertwinkie is offline   Reply With Quote
Old 07-31-2003, 09:53 AM   #7
3 Rivet Member
 
Rickk48's Avatar
 
Bigfork , Montana
Join Date: Sep 2002
Posts: 204
Images: 5
I have been using the Flush King for a couple of months and think it works really well. Totally eliminates need to drag hose into trailer, and gives a good visual check as to cleanliness of the tank.

Eric, I have only one Fantastic Fan in my Bambi, above the dinette/Galley area. With the rear vent slightly open, we get very good "all trailer" ventilation, blowing in or out. With the two vents only about 8' apart, I think two Fantastic Fans might be slight overkill (except for the rain sensing feature). On a longer trailer, I could certainly see the benefit.
__________________
Rick Klein
Seeking another Bambi
'08 Honda Ridgeline
Rickk48 is offline   Reply With Quote
Old 07-31-2003, 01:38 PM   #8
Aluminut
 
Silvertwinkie's Avatar
 
2004 25' Safari
. , Illinois
Join Date: Feb 2003
Posts: 10,334
Rick, thanks for the input on your exp with the fantastic fan. I kind of get my eyes bigger than my stomach when I think of improving things!
__________________
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91
Silvertwinkie is offline   Reply With Quote
Old 07-31-2003, 04:27 PM   #9
Moderator
 
jcanavera's Avatar

 
2004 30' Classic Slideout
Fenton , Missouri
Join Date: Mar 2002
Posts: 9,002
Images: 143
Send a message via AIM to jcanavera Send a message via Skype™ to jcanavera
I have 2 fans and a much larger trailer than a Bambi. My interest in two fans was purely based on volume of air. Two can exhaust more than one. Plain and simple. Two fans really wouldn't be overkill if your interest is moving air. Sometimes the motion is what keeps you cool, especially when the outside temp is pretty warm.

Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
jcanavera is offline   Reply With Quote
Old 07-31-2003, 04:36 PM   #10
4 Rivet Member
 
dtbw's Avatar
 
1999 34' Limited
2002 19' Bambi
Allen , Texas
Join Date: Apr 2003
Posts: 292
Images: 15
2 Fans in Bambi question

I have been contemplating putting in another Fantastic Fan in our 19'. Part of the reasoning is the auto closure in case of rain as well as the added ventilation of either both pulling or a push/pull operation. Has anyone done this on a 19' Bambi yet? I am curious if there is wiring at the vent or will I just need to pull a new wire from the adjacent ceiling light.
__________________
david & bret
'02 Bambi LS
'99 34' Limited
Air Forums # 2159
Past President Heart of Texas Camping Unit
WBCCI # 7548
dtbw is offline   Reply With Quote
Old 07-31-2003, 09:25 PM   #11
4 Rivet Member
 
WayWard Wind's Avatar
 
2004 25' Safari
Join Date: Jan 2003
Posts: 424
Rick at A-S quoted me "around" $400 for the Flush installed. Said they would have to remove the belly pan for the install. I agree that the Flush King appears to work well. No hoses in the trailer & with the clear view elbow connection you can tell when the system is clean. So most likely we will go with the Fantastic Fan at $425. It will have the rain sensor, which will be nice if we need to leave the Mr. Turbo in-residence for a short period. I would think that with a 19' , leving a window open & running the fan on exhaust would be adaquate. Btw, has anyone else had problems with Rick/ A-S not returning calls? Took me 3 days to get thru to Rick, as he would not return calls, even after another worker told me he had my name ,telephone #, on his desk & was to call. When I findly talked to him, I wished I hadn't as he was very unpleasent & not really helpful. Kinda cheapens the A-S thing for me. Anyway so goes life.
Best,
__________________
Home of the Wayward Wind

Bogfrog & Mr. Turbo

If in life you stumble, make it part of the dance
WayWard Wind is offline   Reply With Quote
Old 08-01-2003, 08:40 AM   #12
4 Rivet Member
 
dtbw's Avatar
 
1999 34' Limited
2002 19' Bambi
Allen , Texas
Join Date: Apr 2003
Posts: 292
Images: 15
Black flush install

A.E.
I am surprised that A/S feels it make it easier to pull the belly pan than to work just from the lavatory area. When I had my lav area out, I could clearly see and reach all the black flush components. The inlet to the black tank is just at floor level toward the curbside wall. There is a hose that goes upto a vacuum breaker mounted on the wall just below the lav counter and then out to the outside connection. They will have to pull the lav area out anyway to do the installation of the plumbing. I will take another look at mine when I bring the Bambi home for next week's trip. Clearly the time to do the black tank is before it is installed, but given that I had no problems cutting the opening for the Thermasan probe (1 3/4") I see no reason why A/S could not do the same. I just used my right angle drill and a boring bit. I did have to angle the bit down some to get it as low on the tank as possible, but the tank is only a fraction of an inch thick, so the slight angle was immaterial. The black tank flush inlet was only a few inches away and at the same height as the opening I drilled. If I can can get some decent pics, I will send them to you. (I failed to takes pics while I was doing the Thermasan installation...stupid me)
__________________

__________________
david & bret
'02 Bambi LS
'99 34' Limited
Air Forums # 2159
Past President Heart of Texas Camping Unit
WBCCI # 7548
dtbw is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Recent Bambi owners wanted! rluhr 1997 - 2004 Bambi 82 09-01-2009 09:55 PM
Why not grey water into black tank? pilgrim_still Waste Systems, Tanks & Totes 40 10-08-2003 08:59 PM
how long to fill black tank? Stefrobrts Waste Systems, Tanks & Totes 11 06-30-2003 12:14 PM
Easiest way to flush black tank? JLD Waste Systems, Tanks & Totes 10 02-19-2003 08:16 PM
Black Tank Flush System Ed & Nancy Our Community 6 02-19-2003 09:36 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:29 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.