I kinda thought it was obvious that a multi-level liquid pump would be for replacing pump stacks.
Obviously not, since it took a few read-throughs to even NOTICE the reference to z-levels.
The weight of the buckets will be balanced between the up and down sides of the chain, but the water itself has weight and you've lifting the entire weight of the full buckets up. Plus the structure shown in the illustration on the wiki page is MUCH larger than a pipe with a screw in it.
I played a balancing act, making chain pumps more expensive, slower, and bigger in exchange for it being much more efficient and MUCH easier to setup.
More efficient, despite being slower? I'd like to see the math on that. How deep do the pumps have to be before a chain pump as described would be more efficient?
And as for necroing, I haven't really kept up with suggestions since I posted this but necroing was seen as just as bad as posting yet another multiplayer/multithreaded/steampunk/ect... suggestion.
Necroing. Is. Okay. On. The. Suggestions. Subforum.Sorry about the TV Tropes link.
Also, chains and buckets are dirt-cheap. So building this pump would hardly be a drain on resources.
Buckets, yes, as much as beds or barrels. What about ropes?
I like the idea of adding variety to the types of powered machines we can build, but why duplicate something which we can already do?
Because pump stacks are extremely complex and require knowledge of how fluids and mechanical energy behave in Dorf Fort.
Also constructing a pump stack without problems is something only veteran players can do.
I hardly consider myself a veteran, but I think I could figure out a pump-stack if I had to!
And should Toady implement pipes for moving water we can use screw pumps for moving liquids horizontally and chain pumps for moving liquids vertically.
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Screw pipes should probably be able to move water horizontally, but also vertically (although not much).