Oh shit. Literally.
After being proud of myself fixing up the holding tank last week, yesterday we had to have the tank pumped out again. Having observed how pathetic the vent pipe for the tank is, we told the dock staff to only partially crack open the cock on the vacuum line so we could slow the flow rate.
It started well, until Emma called out that there was a loud whistling coming from her cabin. I raced down, pulled her bed apart, lifted the covers, and...holy crap! The "rigid" 200 gallon polyethylene holding tank had collapsed like a plastic bag - I thought it had to be stuffed. Quickly shutting off the vacuum the whole tank immediately rebounded to almost correct shape again - don't knock modern materials!
Now I have to empty Emma's cabin out again so I can get to the tank level sender unit and fix up the seal again (that is where the whistling was coming from) and will need to check all vent line plumbing. Given that the fitting for the vent line is just too small to handle any kind of serious suck, I have made use of a spare fitting point in the top of the tank and fitted a sizeable ball cock on a riser; now when we empty out using the dock's nuclear-powered pump-out we can open the cock to ensure the tank can vent fast enough.
Remember folks, 25%...
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