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Old 08-29-2015, 10:58 PM   #11
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Dumping the black slowly will leave the solids in the tank.The black tank in your RV depends on velocity to empty the solids.I understand the "out in the country so no permit" thing completely,but the codes are written to ensure that a system works,not just to sell more pipe.What your guy is doing would be fine for a cleanout ( which is also reqd),but thats not what you are useing it for.
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Old 08-29-2015, 11:09 PM   #12
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I guess to explain this in a more simple way,that dump needs to be vented within 6' UPSTREAM and vented again no more than 10' DOWNSTREAM. I avoided this delima by putting in a dedicated 500gal tank and 80 linear' of field.My dump is directly in the top of the tank,eliminateing the need for any vent stacks.
My tank is 1000 gallons with 113 linear feet of drain field. Does that change anything?
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Old 08-29-2015, 11:16 PM   #13
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Dumping the black slowly will leave the solids in the tank.The black tank in your RV depends on velocity to empty the solids.I understand the "out in the country so no permit" thing completely,but the codes are written to ensure that a system works,not just to sell more pipe.What your guy is doing would be fine for a cleanout ( which is also reqd),but thats not what you are useing it for.
Makes sense. Basically he told me he would put in a clean out that could also be used as an RV dump. I'll quiz him down tomorrow. Thanks!
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Old 08-29-2015, 11:18 PM   #14
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No.My tank is for the RV only. I have a 1500 gal tank and field for the house black water and another 500gal tank and field for house grey water. Your tank is common to the house and RV.It is a requirement to vent any line dischargeing into the tank inlet line.You only need a 1.5" vent "T" on either side of your dump line (upstream and downstream). This 1.5" vent stack only needs to be 6" above the flood grade at its end,meaning that where it comes out of the ground it only needs to be 6" above grade.Put 2 - 90 degree "L's" on the top of each vent so as to keep dirt and debris from entering.
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Old 08-29-2015, 11:28 PM   #15
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One more thing,I would check closely that your main line to the tank has 1/4" per foot drop for its entire length,no humps or low spots. This is critical because when you dump your RV its like flushing the toilet in the house 100 times all at once. Sewer draind are designed to float solids along to the tank and you dont have anywhere close to enough water going thru the line to properly do that. Any highs or lows are a perfect spot to build a clog,it must flow freely over its entire length.
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Old 08-30-2015, 11:00 AM   #16
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this is how I protected the dump cap.
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Old 08-30-2015, 11:01 AM   #17
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Got more info this morning. The clean out is on a swept connector. The said it will be a little below grade and I will need to glue an adapter of my choice to it. I think I will use one of the 4" screw caps and then put a sprinkler box over it at grade level.

I'm going to give it a shot dumping without vents installed. Plenty of people successfully dumping their black water into their septic clean outs without vents.

If I need vents I'll be back for more info. Thanks for all the advice!
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Old 08-30-2015, 01:15 PM   #18
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Cleanout sewer dump

When we installed our septic system, our plumber installed a sweep clean out and a 4" threaded cap. Our sewer hose 90 elbow screws onto that, and it works very well. It is vented through the vent stack. Haven't had any problem for two years with the system.
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Old 08-30-2015, 02:13 PM   #19
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If you can, be sure that you have a tilted slope on which to park your RV/TT at the time you dump. This will increase the velocity of the sludge exiting the black water tank. I use the septic clean-out that's near the house. It's a sweep so sludge enters the main line easily and goes directly to the septic tank a few feet away. I didn't have a natural tilt to the land, so I built a little 12 inch high ramp and pull my right tire up on the ramp to dump. Slick as green owl dung!
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Old 08-30-2015, 05:31 PM   #20
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Master Plumber here..........You can dump the black & gray tanks into the 4" threaded fitting without any problems. Your vent is on top of the camper, which is upstream of the black and gray tanks. I would install another drain opening closer to the septic tank. I'm sure that the "T" is a sweep tee because the clean out is for cleaning with a sewer machine, which needs the sweep to clean the pipe to the septic tank.
Roger
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