Jun-21-2022 09:00 PM
Jun-23-2022 08:39 PM
Jun-23-2022 06:59 PM
Jun-23-2022 11:16 AM
Jun-23-2022 09:34 AM
dougrainer wrote:Now that's funny.
The RVIA standard
Jun-23-2022 06:47 AM
sprintnut wrote:nickthehunter wrote:
Why do people not leave their black tank valve open when flushing the tank? Valve open, tank won't overfill, why would I want to risk a disaster?
Nick, I close the black valve when using flusher because the flusher does not clean the tank out. After years of use I have found filling the tank several times and draining does a much better job of getting stuff out. Maybe the shape of my tank is difficult to rinse with just the flusher but I do what works best for me. By the way, my accident was a error on my part by hooking water hose to flusher instead of water supply fitting.
Jun-23-2022 06:45 AM
Jun-23-2022 05:24 AM
Cummins12V98 wrote:
I think I said exactly all that. How do you know the tank can build pressure??? I don't see how if there is a vent pipe.
Jun-22-2022 09:14 PM
Jun-22-2022 08:31 PM
time2roll wrote:
Step away like a boss. Nothing happened.
Jun-22-2022 08:09 PM
nickthehunter wrote:
Why do people not leave their black tank valve open when flushing the tank? Valve open, tank won't overfill, why would I want to risk a disaster?
Jun-22-2022 06:50 PM
nickthehunter wrote:way2roll wrote:since I’m not going to be storing drinking water in it, it just doesn’t need to be that clean. I find as needlessly wasting water making your poop holding tank OCD clean, and rude to needlessly hold up everyone in line behind you at the dump station as you refill and refill and refill and refill again until you get clear water. I’ve seen it personally way to many times.nickthehunter wrote:
Why do people not leave their black tank valve open when flushing the tank? Valve open, tank won't overfill, why would I want to risk a disaster?
Because it's not only the force of the water from the flush to "wash" debris from the sides of the tank, it's the physics involved to use a 1/2 or 3/4 full tank's rush of water to flush all that debris out the hose. I repeat this process several times until I get clear water. The trick, as the op found out, is not to walk away and let it overfill. It's only a disaster if that happens.
A 5 gallon pail of water down the commode right after dumping works just fine for me.
Jun-22-2022 06:48 PM
dougrainer wrote:Cummins12V98 wrote:dougrainer wrote:
OK, one thing that can happen when you do this, it can BREAK the 3 inch down tube from the black tank. The Pressure involved when you do this is tremendous. 45 psi or more has filled the black tank and now the tank has expanded(swollen) and popped either the 3 inch down tube loose or the 1.5 inch vent tube loose. We know this because instead of water coming out the roof vent and overflowing on the roof it came out the bottom from the top of the tank. Because the tank broke open at the tank which is a good thing instead of out the roof vent. NOW, if you do NOT fix the problem on top the tank, you will have black tank odor migrating into the lower bottom cavity because it is NOT sealed now. The RVIA standard for both Gray and Black is to hold water when overfilled. With Black we fill until the water is just below the toilet ball valve and on Gray with water coming into the shower or tub. Also, unless you access and clean out the top of the tank and the underbelly and insulation, you will now have a musty smell all the time. Both inside and out. Doug
How do you know this? There is a roof vent there for a reason, I don't see how pressure can be added when there is a vent.
I suggest you start a Black flush and let it go with valves closed. If the pipes to the tank are glued, you will have sewage water coming out the roof top vent. I HAVE NEVER DONE IT! I have FIXED quite a few that customers have done it. AND, if the 1.5 inch pipe is NOT sealed where it comes thru the outer roof deck, you will get water into the roof cavity. With water coming out from the interior ceiling panels and such. Doug
Jun-22-2022 05:42 PM
way2roll wrote:since I’m not going to be storing drinking water in it, it just doesn’t need to be that clean. I find as needlessly wasting water making your poop holding tank OCD clean, and rude to needlessly hold up everyone in line behind you at the dump station as you refill and refill and refill and refill again until you get clear water. I’ve seen it personally way to many times.nickthehunter wrote:
Why do people not leave their black tank valve open when flushing the tank? Valve open, tank won't overfill, why would I want to risk a disaster?
Because it's not only the force of the water from the flush to "wash" debris from the sides of the tank, it's the physics involved to use a 1/2 or 3/4 full tank's rush of water to flush all that debris out the hose. I repeat this process several times until I get clear water. The trick, as the op found out, is not to walk away and let it overfill. It's only a disaster if that happens.
Jun-22-2022 03:59 PM
Cummins12V98 wrote:dougrainer wrote:
OK, one thing that can happen when you do this, it can BREAK the 3 inch down tube from the black tank. The Pressure involved when you do this is tremendous. 45 psi or more has filled the black tank and now the tank has expanded(swollen) and popped either the 3 inch down tube loose or the 1.5 inch vent tube loose. We know this because instead of water coming out the roof vent and overflowing on the roof it came out the bottom from the top of the tank. Because the tank broke open at the tank which is a good thing instead of out the roof vent. NOW, if you do NOT fix the problem on top the tank, you will have black tank odor migrating into the lower bottom cavity because it is NOT sealed now. The RVIA standard for both Gray and Black is to hold water when overfilled. With Black we fill until the water is just below the toilet ball valve and on Gray with water coming into the shower or tub. Also, unless you access and clean out the top of the tank and the underbelly and insulation, you will now have a musty smell all the time. Both inside and out. Doug
How do you know this? There is a roof vent there for a reason, I don't see how pressure can be added when there is a vent.