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Old 08-29-2015, 10:17 PM   #1
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Septic tank RV dump

We are building a barn on our remote property in Montana. The septic tank is being installed as I type this. The installer put a 4" clean out pipe uphill from the tank to use as an RV dump. It has a cap on it that he says I can just tap off with a hammer or mallet.

Will my standard RV dump hose fit nicely into 4" schedule 40 PVC or do I need to get some type of adapter? We are heading up to the property in about two weeks and I would like to have what I need as it's a couple hour drive to the closest hardware store.

Thanks.
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Old 08-29-2015, 10:24 PM   #2
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Here'a a PDF with the pipe and fitting dimensions. Compare it to your sewer hose connection.

I think what you see in campgrounds is 4".
Attached Files
File Type: pdf Pressure_Pipe_Fittings.pdf (1.40 MB, 130 views)
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Old 08-29-2015, 10:24 PM   #3
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If you hose has the tapered adapter on the dump station end, you will be fine. If it has the bayonet connector, the tapered adapter is needed.
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Old 08-29-2015, 10:25 PM   #4
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I used a 4" threaded cleanout on mine.When I poured the concrete around it I made the finished top of the concrete about 3" above the top of the cleanout cap.I did this so as to not snag it with the snow plow and to be able to drive over it without putting any pressure on the plastic cleanout cap. My 90 deg hose end fits nicely.A stinky slinky would not w/o a 90 deg end on it.
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Old 08-29-2015, 10:29 PM   #5
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Thanks guys. I have the tapered connection that I usually put into the hinged dump hole at the dump station. Photo of work in progress attached.

My trailer and dump hoses are on the property which is 1,100 miles away from home so I can't measure.

Sound like I'm good to go. I need a tight connection because if it slips off I'll be dumping a lot of dookie next to the living quarters of my barn. Wife might have a stroke

Oh and I think I am going to have them move the dump T closer to the tank. It looks real close to the door opening.



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Old 08-29-2015, 10:37 PM   #6
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I hope thats a sweeping "T" and not a std 90 deg one.Another thing is that you are dumping into a run and without some provision for venting on each side it will burp and could suck the traps empty in your building.
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Old 08-29-2015, 10:41 PM   #7
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Quote:
Originally Posted by trbomax View Post
I hope thats a sweeping "T" and not a std 90 deg one.
Not sure as I've only seen the photos. I am speaking with the installer tomorrow before he back fills the trench. I'm going to ask him to move the dump closer to the holding tank.

Is the concern with a 90 degree that it will clog under the pressure of the dump?

Is there are any other concern for sucking the traps then getting odor into the barn? I'd probably run water in the building when dumping the RV to help things move along.

The guy has been installing septic tanks for decades and says he always installs RV dumps like this.

I need to figure out any problems quick as they are finishing the job tomorrow.

Thanks for all the advice.
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Old 08-29-2015, 10:47 PM   #8
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The concern is that sewer gas will run back into the building thru the empty traps,and no plumbing code in the world will approve this design.A std "T" will clog and back up and w/o provideing proper venting the dump line will burp,spewing sewage out the top.
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Old 08-29-2015, 10:51 PM   #9
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The concern is that sewer gas will run back into the building thru the empty traps,and no plumbing code in the world will approve this design.A std "T" will clog and back up and w/o provideing proper venting the dump line will burp,spewing sewage out the top.
I am remote with no codes and no inspections. My builder is great but he is not doing or involved with the septic.

I'll ask the installer whether it's a sweeping T.

What kind of vent is needed?

Will it work as installed if I dump the black slowly?
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Old 08-29-2015, 10:56 PM   #10
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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.
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