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Tapping into a 4" Cast Iron Sewer Pipe

Tapping into a 4" Cast Iron Sewer Pipe

Are there any options other than cutting completely through the pipe when trying to tap a 2" drain into a 4" Cast Iron pipe. I'm not sure of supporting everything above if I completely sever the pipe. I was hoping to drill or grind into the side, then 'T' to a 2" PVC. Wondering if there are some type of fittings for an application like this. Getting the hole in the pipe is not the problem-availability of the appropriate system/fittings is my question.

Re: Tapping into a 4" Cast Iron Sewer Pipe

The only "proper" way to do it is to cut a section of pipe out and install the PROPER fitting to make the connection. "Saddle tees" are NOT a proper connection.

Re: Tapping into a 4" Cast Iron Sewer Pipe

There are probably no codes in the U.S. that allow saddle fittings. To do it correctly, you will need to cut a section of 4" pipe out.

Re: Tapping into a 4" Cast Iron Sewer Pipe

we used to use 'weldolets' at the navy yard. you don't cut out a section of 10 or 12 inch coppernickel pipe to add a 2 inch branch.

Re: Tapping into a 4" Cast Iron Sewer Pipe

BUT, since he is working with cast iron, he can't weld a "Weld-o-let" onto the pipe either.

Re: Tapping into a 4" Cast Iron Sewer Pipe

Thread-O-Let + Epoxy + Duck Tape = Typical DIYer work (threadolet for serviceability)

Re: Tapping into a 4" Cast Iron Sewer Pipe

A plumber once drilled a hole in the side of a PVC sewer main and stuck his house sewer pipe into it, with some epoxy putty to seal it. The problem was he shoved his pipe almost all the way across the main line so the city could not run their equipment past it when it caused a stoppage

Re: Tapping into a 4" Cast Iron Sewer Pipe

hj, look the Romans used a "tapped tee" to connect a small pipe to a large pipe. Their "pipes" are sized so that there is no need to vent them.

Re: Tapping into a 4" Cast Iron Sewer Pipe

packy, how is a submarine bathroom vented? There is no "atmospheric" to vent to. Is it some kind of negative pressure suction machine that activates every time a drain is used?

Re: Tapping into a 4" Cast Iron Sewer Pipe

boston navy yard serviced about every type of ship but not submarines. i have worked on ships from aircraft carriers, destroyers, battleships, tankers tug boats, and i even installed a sprinkler system on the USS constitution. BUT, i found this on the internet.. ...................................... How to Use the Submarine Toilet Flushing System: After entering, close door “A” Open waste tap “B” and flush tap “C” with lever “D”, causing door “A” to be blocked. Open cover “E”. Move lever “F” to “use”. Use lavatory “G”. Open waste tap “H” and flushing tap “I”. Move lever “F” to “flush” position (do this more carefully the deeper the submarine is submerged) until compartment “J” is barely filled. Open shut-off valve “K”. Move lever “F” carefully to position “eject”. Compartment “J” is filled through “K” and “L” with air from the 12 ATM system. Move lever “F” carefully to the “air waste” position. In this position, the air flows out of compartment “J” through valve “M” to the foulwater tank and on to the battery compartment through pipe “O”. Lever “F” stays in the “air waste” position when the lavatory is not in use. Close and lock taps “H” and “I”. Close lever “E”. Close taps “B” and “C” with lever “D”. ................................................... i guess this is why they don't serve mexican food on subs..

Re: Tapping into a 4" Cast Iron Sewer Pipe

I wonder which step would "sink the sub" if it was missed.

Re: Tapping into a 4" Cast Iron Sewer Pipe

actually, when we connect our house sewers to the main line, when there is no "preexisting" connection, with clay pipe, we DO use a "saddle Y" epoxied over a hole we chisel in the pipe. For PVC we either glue a saddle on or strap it with hose clamps.

Re: Tapping into a 4" Cast Iron Sewer Pipe

Oh my packy this is hilarious! This is too funny. I am not sure I could follow this complicated procedure. I bet the process to launch ICBMs from the sub has less steps. "Press lever F to eject" "Press lever F to eject, aye aye sir." "Unvented ballistic impact in four seconds, brace for smelly gas in engineering!"

Re: Tapping into a 4" Cast Iron Sewer Pipe

The instructions for using the shower in the missile base at Minot N. Dakota were almost as complicated and hilarious, but there the contractor, for the final step, suggested showering in pairs to save water.