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Editing v0.31 Talk:Screw pump

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:I believe they move 7/7 per step. Make sure your drainage is good :) [[Special:Contributions/66.30.8.88|66.30.8.88]] 21:27, 26 April 2010 (UTC)
 
:I believe they move 7/7 per step. Make sure your drainage is good :) [[Special:Contributions/66.30.8.88|66.30.8.88]] 21:27, 26 April 2010 (UTC)
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In a different tack. In the notes section it is mentioned that pumps do not pump 1/7 amounts of liquids, but at least my pumps do in an unmodded version. If no one corrects me I'm going to change that in a few days. --[[User:Egodeus|Egodeus]] 14:50, 20 May 2011 (UTC)
 
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:Could you record a movie of this and upload it to DFMA? I just tried this with water, and a screw pump would '''not''' move it from the source tile unless it was at least 2/7 deep. --[[User:Quietust|Quietust]] 16:12, 20 May 2011 (UTC)
 
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::I'll try to do that once I get the chance. I'm going out of town for the weekend so probably not going to happen before next tuesday. --[[User:Egodeus|Egodeus]] 05:52, 23 June 2011 (UTC)
 
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:I've done a lot of pumping, and it always drains water to 0/7 in the tile being pumped out when it can, assuming it's powered. Non-empty tiles are mostly when surrounded by water and flowing in anyway from pressure. [[User:AutomataKittay|AutomataKittay]] 09:06, 23 June 2011 (UTC)
 
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::Perhaps there is confusion in this discussion due to terminology? I'm thinking, perhaps, pumps will not '''start''' pumping unless the source is at least 2/7 deep, but it will still '''drain''' the source to 0/7 if it had enough to start pumping? Just a thought... I haven't tested this. Also, I vaguely seem to recall a technical discussion on how water flows in DF that claimed the water level in a tile can, sometimes, fluctuate too fast to be updated on the screen. Perhaps the water was fluctuating like this between 1/7 and 2/7? --[[User:Thundercraft|Thundercraft]] 21:38, 25 June 2011 (UTC)
 
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:::I think you're right, did a quick test to verify. It won't pump 1/7 out, but will completely empty 2/7 when ran on manual. My mistake about the always emptying out, it's either evaporation or just not pumping everything down to 1/7. I haven't tried powered, but I'd imagine the behavior would be the same. [[User:AutomataKittay|AutomataKittay]] 07:48, 26 June 2011 (UTC)
 
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::Ok, I verified it. A pump will pump a tile to 0/7 when it pumps, but pumping will NOT occur if the tile is only 1/7 full. I hadn't kept that much of an eye on the pumps and the pumping tile had just evaporated. This is with magma and apparently also holds true for water. Sorry about the trouble. --[[User:Egodeus|Egodeus]] 17:45, 29 June 2011 (UTC)
 
  
 
== Magma-Safe Pump ==
 
== Magma-Safe Pump ==
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Here's my setup:
 
Here's my setup:
  
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Pump pumping north to south from the lake, ramps put in for access while constructing, floor built under first tile of the pump. When I order the pump to be started, the reservoir gets filled. I stopped the pumping before the reservoir overfilled, then designated the level above as a zone. Water source does not highlight, and designating it doesn't work.
 
Pump pumping north to south from the lake, ramps put in for access while constructing, floor built under first tile of the pump. When I order the pump to be started, the reservoir gets filled. I stopped the pumping before the reservoir overfilled, then designated the level above as a zone. Water source does not highlight, and designating it doesn't work.
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I must be an idiot though because after 3 days trying with the wiki and youtube open I still can't get a single level of pump stack to work either.
 
I must be an idiot though because after 3 days trying with the wiki and youtube open I still can't get a single level of pump stack to work either.
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========It turns out that water will be purified by screw pumps, but only if the receiving structure has never previously contained salt water. Once it has, it will become permanently salty, no mater what materials are used to construct the cistern. You can even use natural materials. See [[water]]
 
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"A screw pump can be used to desalinate water, but if the fresh water produced ever contacts salty water, the "saltiness" will conduct through the entire body of water making the reservoir permanently salty, so be careful not to drain the fresh water into salty water (including salty aquifers). Note that once a tile is marked as salty, it cannot be reverted without external tools.
 
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Previously there was a myth that water would turn salty if it ever touched natural stone. This myth has been debunked, any cistern will work, except those dug into a beach, which may spontaneously turn salty (constructed cisterns on the beach are fine though)."
 
  
 
== Pumping FPS ==
 
== Pumping FPS ==
  
 
I have built about 110 pumps in a stack to get magma to the surface. After I have turned them on, the FPS dropped to <1 (with typical FPS about ~60) until all stack containments filled up to the 7/7. [[User:WFrag|WFrag]] 06:24, 25 June 2010 (UTC)
 
I have built about 110 pumps in a stack to get magma to the surface. After I have turned them on, the FPS dropped to <1 (with typical FPS about ~60) until all stack containments filled up to the 7/7. [[User:WFrag|WFrag]] 06:24, 25 June 2010 (UTC)
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: http://www.bay12forums.com/smf/index.php?topic=72296.0 [[User:WFrag|WFrag]] 11:27, 25 January 2011 (UTC)
 
  
 
== They only stack one way if you dig correctly ==  
 
== They only stack one way if you dig correctly ==  
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Here's the thing that I've never understood: If I dig a set of Up/Down stairs straight down, and then position a pump stack to pump water into the stairs, water will get pushed into the stairwell. This water has nowhere to go but up, and eventually rises up the stairwell. So why do we need pump stacks in the first place? Why not just pump into a vertical aqueduct? --[[User:Romeofalling|Romeofalling]] 02:57, 1 October 2010 (UTC)
 
Here's the thing that I've never understood: If I dig a set of Up/Down stairs straight down, and then position a pump stack to pump water into the stairs, water will get pushed into the stairwell. This water has nowhere to go but up, and eventually rises up the stairwell. So why do we need pump stacks in the first place? Why not just pump into a vertical aqueduct? --[[User:Romeofalling|Romeofalling]] 02:57, 1 October 2010 (UTC)
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:Er, pumps don't work that way - they can't lift a liquid higher than the Z-level of the pump output tile. Thus, if you have water on Z=120 and you need to move it up to Z=140, you '''need''' twenty screw pumps. --[[User:Quietust|Quietust]] 04:49, 1 October 2010 (UTC)
 
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== power output ==
 
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How much power does the pump transfer? And given no other power source, what's the limit of pumps that a single dwarf could hand-power? [[User:Uzu Bash|Uzu Bash]] 00:31, 20 October 2010 (UTC)
 
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:Power transfer?  As much as is supplied, minus the 10 points for running the pump.  Dwarf-power?  Just the one he's operating. --[[User:DeMatt|DeMatt]] 00:33, 20 October 2010 (UTC)
 

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