Changes

Jump to: navigation, search

Sludging - Rota sludge

3,194 bytes added, 22:33, 5 September 2016
no edit summary
{{stubLanguage-box|english_link= Sludging - Rota sludge | french_link= Coming soon | spanish_link= Coming soon | hindi_link= Coming soon | malayalam_link= Coming soon | tamil_link= Coming soon | swahili_link=coming soon | korean_link= Coming soon | chinese_link=污泥鑽 - 羅塔污泥鑽 | indonesian_link= Coming soon | japanese_link= Coming soon }}[[Image:Rota_sludge_well_drilling_icon.png|right]]
__NOTOC__[[Image:Icon_sludge.png|right|80px]][[Image:Rota sludge in action.jpg|thumb|right|200px|Rota sludge in action]][[Image:Deep drilling with the rota sludge.jpg|thumb|right|200px|Deep drilling with the rota sludge]]
The RotaSludge is a manual drilling technique based on the [[Sludging -Asian sludge method is an adaptation of the Indian hand |Asian sludge method]] technique, and adapted for harder soil types. The To drill through the harder layers, a hardened drill bit and weight have been added. Just after the downward movement of the drill pipes the drill bit is turned 90 degrees during drilling rotated a quarter turn, thus chiselling the bottom of the hole. This technology can be used Water is circulated to bring the cuttings to drill 2-5 inch wells in layers with sand, clay, gravel, tuff stone or weathered rockthe surface.
[[Image:Rota_sludge_well_drillingDuring drilling, the drill pipe is moved up and down.PNG|thumb|right|150px|Drilling On the down stroke, the impact of the drill bit loosens the soil and on the up stroke, the top of the pipe is closed by hand (or a 20 m deep valve), drawing up the water through the pipe and transporting the cuttings to the surface. On the next down stroke, the hand (or valve) opens the top of the pipe and the water squirts into a pit, in front of the well in Chinandega. In this pit, Nicaraguathe cuttings separate from the water and settle out, with while the water overflows from the pit back into the Rota-sludge method ]]well.
The borehole stays open by water pressure. Thickeners such as clay, bentonite or even cow dung are usually added to the water in order to prevent hole collapse and reduce loss of working water (drill fluid).
{{procontable | pro=The Rota- Can drill in hard soil <br>| con= }}Sludge was developed by the [http://www.practica.org Practica Foundation].
== Capacity =Suitable conditions===Suitable for unconsolidated formations: Sand, silt and clay. Because of the rotation and the drill bit, it is possible to penetrate softer-consolidated formations such as stiff clays, soft sandstone, and weathered laterite.
The Rota Sludge method can be used to drill 2-5 inch wells up to 20 meterm deep.
{| border="1" cellpadding= Costs of wells "5" cellspacing="0" align="none"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#f0f8ff;" | Disadvantages|-| valign="top" | - Easy to handle and a temporary casing is normally not needed. It is possible to construct the drilling equipment locally.<br>- Can drill through softer-consolidated formations.| valign="top" | - The borehole stays open by water pressure. To prevent collapsing, fluid-drilled boreholes must be kept full of water during the entire drilling and well installation process.<br>- Coarse gravel and other highly permeable materials (cracks in the formation) cause loss of working water and cannot be drilled. If very fine sands (quick sands) are encountered in the first three meter of the borehole, a temporary casing and swell clay are needed on the outside of this casing to prevent collapse.<br>- If cow dung is used as drilling fluid, this can cause contamination of the well, which can take several weeks to disappear. |}
US$ 30 India===Construction, operations and maintenance===[[Image:Diagram of a rota sludge.jpg|thumb|right|200px|Diagram of a rota sludge]]US$ 80[[Image:Rota_sludge_well_drilling.PNG|thumb|right|200px|Drilling a 20 m deep well in Chinandega, Nicaragua, with the Rota-400 Nicaraguasludge method. Photo: Netherlands Water Partnership.]][[Image:Rota sludge drill bit.jpg|thumb|right|200px|Rota sludge drill bit]]
== Applying conditions ==<b>Cost of introduction:</b> Variable US$ 5,000-20,000 per project, including hand-on training, drill set Cow dung is mixed with water to create a very low cost drilling fluid. It may take several weeks after the drilling is finished for the pathogens (bacteria) to die and drilling disappear completely out of test wellsthe well.
{{Joinus}}All drilling equipment is locally produced.
==Rota Sludge Manual=Costs===*[http://www.practicafoundation.nl/wp-content/uploads/PDF/Practica%20drilling%20Rs%20versie%201th%20september%2005.pdf Rota-sludge and stone hammer drillingIn India, Part 1, Drilling manual]. Produced by [http://www.practicafoundation.nl PRACTICA Foundation] and [http://www.etc-international.org/index.php?id=41 ETC Foundation].*[http://www.practicafoundation.nl/wp-content/uploads/PDF/practica-production-rs-versie-1th-september-051.pdf the cost of a well made with Rota-sludge and stone hammer drilling, Part 2, Production manual]. Produced by [http://www.practicafoundation.nl PRACTICA Foundation] and [http://www.etc-international.org/index.php?id=41 ETC Foundation]is about US$ 30.*High quality manuals for Rota-sludge drillingIn Nicaragua, well digging and other manual drilling and digging methods are available as well this varies from [http://www.connectinternational.nl/english/smartmodules/smart-tec/wells-boreholes/handdrilling Connect International]. They are for free for organizations which are a [http://www.connectinternational.nl/files/membership.pdf member of Connect International] (cost: 50 Euro per year)US$ 80 to US$ 400.
== Movie ==* [http://www.youtube.com/watch?v=U229vvThe cost of introduction varies between US$ 5,000-McNw www.youtube.com/watch?v=U229vv20,000 per project, including hand-McNw]* [http://nlon training, drill set and drilling of test wells.youtube.com/watch?v=MvebFHCjCvk nl.youtube.com/watch?v=MvebFHCjCvk Rota sludge drilling Madagascar January 2008]
== External =Field experiences===The Rota Sludge is used in Nicaragua, Tanzania, Madagascar, Ghana, Senegal, Mauritania and Niger. ===Manuals, videos and links ===* [http://ec.europa.eu/echo/files/evaluation/watsan2005/annex_files/PRACTICA/PRACT2%20-%20Rota-sludge%20and%20stone%20hammer%20drilling.pdf Rota-sludge and stone hammer drilling, Part 1, Drilling manual]. Produced by [http://www.practicafoundationpractica.nl org PRACTICA Foundation] and [http://www.practicafoundationetc-international.nlorg/index.php?id=41 ETC Foundation]. * General [http://www.sswm.info on well /sites/default/files/reference_attachments/HERWIJNEN%202005%20Rota%20Sludge%20and%20Stone%20Hammer%20Drilling%20Part%20two%20Production%20Manual.pdf Rota-sludge and stone hammer drilling , Part 2, Production manual]. Produced by [http://www.rwsnpractica.org PRACTICA Foundation] and [http://www.rwsnetc-international.org/index.php?id=41 ETC Foundation]. * [http://nlwww.practica.org/products/drilling-wells/ Drilling & Wells], Practica Foundation.  {{#ev:youtube|MvebFHCjCvk|200|auto|<font size="2"><center>Rota sludge drilling in <br>Madagascar, January 2008</center></font>}} === Acknowledgements===* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.compractica.org Practica Foundation], and from the [http:/watch?v=MvebFHCjCvk nl/www.rural-water-supply.net/ Rural Water Supply Network], and specifically its [http://www.youtuberural-water-supply.comnet/en/implementation/watch?v=MvebFHCjCvkmanual-drilling manual drilling section].* Organisation [http://www.waterforallinternational wwwlboro.ac.uk/well/resources/technical-briefs/43-simple-drilling-methods.pdf 43. Simple drilling methods.waterforallinternational ]WEDC.
Winona
Akvopedia-spade, akvouser, bureaucrat, emailconfirmed, staff, susana-working-group-1, susana-working-group-10, susana-working-group-11, susana-working-group-12, susana-working-group-2, susana-working-group-3, susana-working-group-4, susana-working-group-5, susana-working-group-6, susana-working-group-7, susana-working-group-8, susana-working-group-9, susana-working-group-susana-member, administrator, widget editor
30,949
edits
Retrieved from "https://akvopedia.org/wiki/Special:MobileDiff/2953...34174"

Navigation menu