Plumbing fail

[unixronin]

So.  The toilet tank in one of our bathrooms has been leaking for a while, and I haven't gotten to fixing it because for so long we didn't have money for replacement parts.  On Sunday, one of the toilet tank bolts fractured because it had corroded away due to the leakage (and due to not being made of anything remotely corrosion resistant, like, say, stainless steel or phosphor bronze).

Yesterday, I buy a replacement bolt/washer kit, dismount the tank, replace both bolts (a significant endeavor in itself, requiring the application of a methylacetylene torch because the broken bolt and its upper nut are solidly corroded into a single unit that cannot be freed with the torque possible on the badly corroded bolt head), and refit the tank.  I discover after doing so that the tank is still leaking from the bolt holes.  The new bolt/washer kit is not sealing the bolt holes because of a tolerance problem (the inner rubber washers are not thick enough to seal between the tank and bowl).  I also discover that, having been disturbed during this process, the stopcock is now leaking as well.

Today, I get a new, different bolt/washer kit, a new tank-to-bowl gasket, a new flex hose to replace the non-reusable 1/4" semi-rigid copper feed pipe, and eventually find the only possible new stopcock that has the correct fittings on both inlet and outlet.  I remove tank, turn off the water to the house, and remove the old stopcock - by the only feasible means, cutting it off the end of the pipe, since it seems to be a single-piece fitting integral to the pipe and chromed after assembly.  I clean up the cut end of the pipe, go to install the new stopcock, and discover at this point that the pipe coming out of the wall is not ANY standard copper pipe size.  It's just oversize enough that it will not in any way go into a 5/8" OD compression fitting.

I curse, scratch my ehad a lot as I try to figure out what the hell to do now, and eventually discover that, by chance, the proprietary-weird-size pipe fortuitously happens to be just large enough ID that by reaming it out a fraction, I can just barely insert a piece of standard half-inch (which is to say, neither the OD nor the ID is half an inch) copper water pipe into the oddball pipe.

I cut and prep a suitable 2" piece of half-inch copper pipe.  I clean and scour both old and new pipe thoroughly, dry the inside of the old pipe as far in as I can, insert my pipe stub and solder it in place, using my rosin-core electronics solder because the lead-free plumbing solder that's all you can buy in hardware stores is utterly worthless crap.  I fit the new compression-fit stopcock to the new pipe stub, turn the house water back on, and leak-test the new stopcock.  The joints are good, so I fit the new bolts kit and gasket to the tank, combining washers from both bolt kits to get the tightest possible seal, and adding some RTV silicone for good measure.

I reinstall the tank, tighten all the bolts, connect the new flex water line to the tank, and leak test again.  It's still leaking, from the other side now.  At first I think it's the pipe joint, but on closer examination I discover that the leak is from a hairline crack in the bottom of the tank.  A crack which originates, to no surprise whatsoever to any remotely competent mechanical engineer, from one of the mounting bolt holes, and which is invisible from inside the tank.

This is the point at which I inquire, yet again, of the universe in general what festering inbred excuse for the illegitimate offspring of an illiterate plumber's drunken apprentice and the village idiot's syphilitic pet monkey came up with the brilliant idea of mounting a toilet tank to a toilet by putting bolt holes THROUGH THE BOTTOM OF THE TANK.  What could possibly go wrong with that stroke of genius?

Comments

[unixronin.livejournal.com]

The thought occurs to me that (in a similar way to what many commercial/public bathrooms now do) you could eliminate the tank completely by putting a flow meter in-line between the water supply and the bowl. *poof* no water storage problems.

The problem with that idea is that most American household plumbing systems simply can't flow enough water fast enough to flush a toilet completely without relying on a tank. However, the Swedes came up a while back with a toilet that uses vacuum-assist to flush a toilet from a small tank that fits entirely behind the toilet and is cast with it in one piece.

You might be able to manage an entirely tankless toilet in the UK. But in the UK, typical household water plumbing is — or was, when I last lived there — about twice the diameter of typical US household water pipes, and capable of flowing more than four times as much water for the same pressure head. (Not only does the pipe have four times the sectional area, it also has lower impedance; if memory serves, a one-inch pipe will flow about six times as much water as a half-inch pipe at the same pressure differential.)

[jhetley.livejournal.com]

It isn't the flow rate, but the pressure. You have to have a certain minimum pressure for a flush valve toilet to work. US residential water pressure varies a lot.

[unixronin.livejournal.com]

True, I've been on well water systems that wouldn't have had enough pressure to flush a tankless toilet.