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So, in rural areas, 3 phase power is not readily available and as the case, 3 phase has to be generated. Traditionally, this was achieved with a phase converter that would take single phase as an input and provide 3 phase power as an output. Within the next two weeks we will be retrofitting a 30 old center pivot system with 2 Horse Power VFD's on each tower that can take single phase input and will provide 3 phase output for each individual motor at each tower. I don't know if anyone has done this yet but I believe it will be revolutionary on multiple levels. First of all accomodating what power is available for the user, providing a soft/gentle start to the motor and gearbox in general which should extend the life of the gear boxes and tires. If this were to be incorporated into a new center pivot, the amount of money in wire and other hardware would be significantly reduced. A savings for the manufacturer and the end user. — Preceding unsigned comment added by 50.30.16.41 ( talk) 04:00, 10 April 2016 (UTC)
As a layman knowing nothing of agriculture, it would be interesting to see more elaboration on why these center pivot machines are used rather than a square layout given the waste of space. —Preceding unsigned comment added by 68.122.80.126 ( talk) 07:04, 3 February 2011 (UTC)
I came here to find this out and was surprised that it's not mentioned: Are center-pivot fields planted (and harvested) spirally or concentrically? It seems to me that a spiral pattern would make the job easier, but a fair amount of Googling has left me none the wiser. — HorsePunchKid→ 龜 15:48, 2 June 2006 (UTC)
Strange question that got me thinking: the irrigation system produces circles, and yet they're still arranged on a square grid instead of a triangular or hexagonal one (imagine honeycomb and you'll see what I'm getting at). That leaves the corners of each square grid either left fallow or less-efficiently irrigated. Was any research ever done into stacking them this way for better yields? -- The Centipede 17:51, 12 August 2006 (UTC)
the apparently more recently developed Saudi agriculture tends to have been laid out with consideration given to central pivot irrigation. I presume that has something to do with it; if your farm predates central pivot irrigation, you tend to go with square arrangement; otherwise you plan for maximal use of space. Refitting into square plots (without sub-plots) wastes 21% of space; fitting into hexagonal plots only 8.5%. Seems like it would be an interesting subject. - Keith D. Tyler ¶ ( AMA) 20:05, 13 October 2006 (UTC)
Is it allowed to translate texts on wikipedia direct into another languages? —The preceding unsigned comment was added by 62.47.140.108 ( talk) 15:06, 18 February 2007 (UTC).
Does someone know some data that quantify such an irrigation system? E.g. typical, average, even record length of array (how many yards or meters?). Quantity of water pumped. Speed of rotation, etc. VanBurenen 13:24, 18 March 2007 (UTC)
Since the wheels at the outer edge of a circle must travel a greater distance than the inner wheels in a given amount of time, how are wheels and sprinkler heads kept in a staight line from the center to the circumference? - John V (23:12, 1 July 2007 74.36.100.241)
The photo at Urapivot.jpg, subtitled "Center Pivot Urapivot made in Spain" is pretty shitty. It is blurry and stuff. I suggest we remove it cause of the quality. Plus it is in like a gallery of other photos, not add much on its own, ya know?
Let me know whacha think- Peter Napkin Dance Party ( talk) 00:31, 3 February 2009 (UTC)
And why threaten removing content. This article is interesting, an was clearly written by people with practical knowledge. Sure, we can add some content and citations, but this sort of practical knowledge does not show up much in textbooks, and for millions of people who work in agriculture, is as basic as saying that Toyota and Nissan are major car manufacturers. Let's not be petty and triggerhappy in flagging. Wxidea ( talk) 17:07, 8 October 2010 (UTC)
Originally, these systems mounted impact "gun" type sprinklers on top of the pipe. The ones with the U pipes hanging sprinkler heads low are conversions of existing systems or of old inventory prior to sale. New systems hang the sprinklers from the bottom of the pipe. The newest development is a double pivot with a swinging end section that has steerable wheels. As the main pipe swings around a corner the end section straightens to reach the field corner. The wheels steer to keep the end of the line following the edge. This eliminates the dead corners problem. Bizzybody ( talk) 19:14, 26 July 2011 (UTC)
While *automatic* linear systems are uncommon, manual or semi-automatic ones are very common. With a manual type, the irrigator must go to the field, disconnect the feed pipe, run the motor to roll the line forward then reconnect the pipe. A semi-automatic type uses a large hose to allow the line to roll further between having to move the water connection. They can also be manually advanced. Bizzybody ( talk) 19:20, 26 July 2011 (UTC)
The *automatic* linear systems use a ditch or canal feed where the hose is pulled along while submerged and does not need to be changed; a fairly common practice in New Zealand and middle eastern countries. Sigrud ds ( talk) 23:07, 11 January 2012 (UTC)
Many of these CP systems now irrigate less than the full 360 degrees. Often a half circle, or a quarter, sometimes some other angle. I assume they automatically reverse, like a car windscreen wiper. When did this technique start? Are there different ways of doing it? 86.149.93.32 ( talk) 04:38, 13 January 2014 (UTC)
Please check the source regarding the invention date - this article says 1940, but various online sources (see http://www.livinghistoryfarm.org/farminginthe40s/water_09.html) indicate that Zybach didn't start working on it until 1947, and didn't get a patent until 1952. I suspect a typo, but perhaps that book somehow has better information.
-- HistorianK ( talk) 00:19, 24 August 2015 (UTC)
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How long does a typical 1/4 mile center pivot take to complete a full rotation? Or putting it another way, what speed does the outer edge of the wheeled structure typically move at? Beorhtwulf ( talk) 10:50, 14 April 2020 (UTC)
Slowly. 2-3m (6.6-10 feet) per minute. [1]. PrisonerB ( talk) 11:09, 14 April 2020 (UTC)
Article is very US-centric, doesn't really say where else this system is used (except Saudi Arabia) or if not why not. Anyone know? 80.189.247.175 ( talk) 13:11, 9 July 2022 (UTC)
![]() | This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
|
![]() | This article was previously a WikiProject Horticulture and Gardening collaboration of the month. |
So, in rural areas, 3 phase power is not readily available and as the case, 3 phase has to be generated. Traditionally, this was achieved with a phase converter that would take single phase as an input and provide 3 phase power as an output. Within the next two weeks we will be retrofitting a 30 old center pivot system with 2 Horse Power VFD's on each tower that can take single phase input and will provide 3 phase output for each individual motor at each tower. I don't know if anyone has done this yet but I believe it will be revolutionary on multiple levels. First of all accomodating what power is available for the user, providing a soft/gentle start to the motor and gearbox in general which should extend the life of the gear boxes and tires. If this were to be incorporated into a new center pivot, the amount of money in wire and other hardware would be significantly reduced. A savings for the manufacturer and the end user. — Preceding unsigned comment added by 50.30.16.41 ( talk) 04:00, 10 April 2016 (UTC)
As a layman knowing nothing of agriculture, it would be interesting to see more elaboration on why these center pivot machines are used rather than a square layout given the waste of space. —Preceding unsigned comment added by 68.122.80.126 ( talk) 07:04, 3 February 2011 (UTC)
I came here to find this out and was surprised that it's not mentioned: Are center-pivot fields planted (and harvested) spirally or concentrically? It seems to me that a spiral pattern would make the job easier, but a fair amount of Googling has left me none the wiser. — HorsePunchKid→ 龜 15:48, 2 June 2006 (UTC)
Strange question that got me thinking: the irrigation system produces circles, and yet they're still arranged on a square grid instead of a triangular or hexagonal one (imagine honeycomb and you'll see what I'm getting at). That leaves the corners of each square grid either left fallow or less-efficiently irrigated. Was any research ever done into stacking them this way for better yields? -- The Centipede 17:51, 12 August 2006 (UTC)
the apparently more recently developed Saudi agriculture tends to have been laid out with consideration given to central pivot irrigation. I presume that has something to do with it; if your farm predates central pivot irrigation, you tend to go with square arrangement; otherwise you plan for maximal use of space. Refitting into square plots (without sub-plots) wastes 21% of space; fitting into hexagonal plots only 8.5%. Seems like it would be an interesting subject. - Keith D. Tyler ¶ ( AMA) 20:05, 13 October 2006 (UTC)
Is it allowed to translate texts on wikipedia direct into another languages? —The preceding unsigned comment was added by 62.47.140.108 ( talk) 15:06, 18 February 2007 (UTC).
Does someone know some data that quantify such an irrigation system? E.g. typical, average, even record length of array (how many yards or meters?). Quantity of water pumped. Speed of rotation, etc. VanBurenen 13:24, 18 March 2007 (UTC)
Since the wheels at the outer edge of a circle must travel a greater distance than the inner wheels in a given amount of time, how are wheels and sprinkler heads kept in a staight line from the center to the circumference? - John V (23:12, 1 July 2007 74.36.100.241)
The photo at Urapivot.jpg, subtitled "Center Pivot Urapivot made in Spain" is pretty shitty. It is blurry and stuff. I suggest we remove it cause of the quality. Plus it is in like a gallery of other photos, not add much on its own, ya know?
Let me know whacha think- Peter Napkin Dance Party ( talk) 00:31, 3 February 2009 (UTC)
And why threaten removing content. This article is interesting, an was clearly written by people with practical knowledge. Sure, we can add some content and citations, but this sort of practical knowledge does not show up much in textbooks, and for millions of people who work in agriculture, is as basic as saying that Toyota and Nissan are major car manufacturers. Let's not be petty and triggerhappy in flagging. Wxidea ( talk) 17:07, 8 October 2010 (UTC)
Originally, these systems mounted impact "gun" type sprinklers on top of the pipe. The ones with the U pipes hanging sprinkler heads low are conversions of existing systems or of old inventory prior to sale. New systems hang the sprinklers from the bottom of the pipe. The newest development is a double pivot with a swinging end section that has steerable wheels. As the main pipe swings around a corner the end section straightens to reach the field corner. The wheels steer to keep the end of the line following the edge. This eliminates the dead corners problem. Bizzybody ( talk) 19:14, 26 July 2011 (UTC)
While *automatic* linear systems are uncommon, manual or semi-automatic ones are very common. With a manual type, the irrigator must go to the field, disconnect the feed pipe, run the motor to roll the line forward then reconnect the pipe. A semi-automatic type uses a large hose to allow the line to roll further between having to move the water connection. They can also be manually advanced. Bizzybody ( talk) 19:20, 26 July 2011 (UTC)
The *automatic* linear systems use a ditch or canal feed where the hose is pulled along while submerged and does not need to be changed; a fairly common practice in New Zealand and middle eastern countries. Sigrud ds ( talk) 23:07, 11 January 2012 (UTC)
Many of these CP systems now irrigate less than the full 360 degrees. Often a half circle, or a quarter, sometimes some other angle. I assume they automatically reverse, like a car windscreen wiper. When did this technique start? Are there different ways of doing it? 86.149.93.32 ( talk) 04:38, 13 January 2014 (UTC)
Please check the source regarding the invention date - this article says 1940, but various online sources (see http://www.livinghistoryfarm.org/farminginthe40s/water_09.html) indicate that Zybach didn't start working on it until 1947, and didn't get a patent until 1952. I suspect a typo, but perhaps that book somehow has better information.
-- HistorianK ( talk) 00:19, 24 August 2015 (UTC)
Hello fellow Wikipedians,
I have just modified 2 external links on Center pivot irrigation. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 23:20, 1 August 2017 (UTC)
How long does a typical 1/4 mile center pivot take to complete a full rotation? Or putting it another way, what speed does the outer edge of the wheeled structure typically move at? Beorhtwulf ( talk) 10:50, 14 April 2020 (UTC)
Slowly. 2-3m (6.6-10 feet) per minute. [1]. PrisonerB ( talk) 11:09, 14 April 2020 (UTC)
Article is very US-centric, doesn't really say where else this system is used (except Saudi Arabia) or if not why not. Anyone know? 80.189.247.175 ( talk) 13:11, 9 July 2022 (UTC)