Energy Education

Penstock: Difference between revisions

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[[File:Yasuoka_power_station_penstock.jpg|360px|thumb|right|Figure 1. A penstock at a hydroelectric facility.<ref>Wikimedia Commons. (August 24, 2015). ''Yasuoka Power Station Penstock'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/d/dc/Yasuoka_power_station_penstock.jpg</ref>]]
[[File:Yasuoka_power_station_penstock.jpg|360px|thumb|right|Figure 1. A penstock at a hydroelectric facility.<ref>Wikimedia Commons. (August 24, 2015). ''Yasuoka Power Station Penstock'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/d/dc/Yasuoka_power_station_penstock.jpg</ref>]]
<onlyinclude>'''Penstocks''' are pipes or long channels that carry [[water]] down from the hydroelectric [[reservoir]] to the [[turbine]]s inside the actual [[power plant|power station]].<ref>G. Boyle. ''Renewable Energy: Power for a Sustainable Future'', 2nd ed. Oxford, UK: Oxford University Press, 2004.</ref> They are made of steel and allow water to flow through under high [[pressure]]. They are a vital component of a [[hydroelectric facility]] that allows water to move to the turbine.</onlyinclude><ref>Expert Eyes. (August 24, 2015). ''Layout of Hydroelectric Power Plants'' [Online]. Available: http://www.expert-eyes.org/deepak/layout.html</ref> Grates or filters can be attached to the ends of penstocks to trap large debris such as branches. This ensures that debris cannot enter the channel and block the flow of water.<ref name="RE1">McMahon, M. (2024). (Accessed May 21, 2026) ''What is a Penstock?'' [Online]. Available: https://www.aboutmechanics.com/what-is-a-penstock.htm</ref><ref>Science Insights (2026). (Accessed May 21, 2026). ''What Is a Penstock and How Does It Work in Hydropower?'' [Online]. Available: https://scienceinsights.org/what-is-a-penstock-and-how-does-it-work-in-hydropower/</ref>


<onlyinclude>'''Penstocks''' are pipes or long channels that carry [[water]] down from the hydroelectric [[reservoir]] to the [[turbine]]s inside the actual [[power plant|power station]].<ref>G. Boyle. ''Renewable Energy: Power for a Sustainable Future'', 2nd ed. Oxford, UK: Oxford University Press, 2004.</ref> Generally, they are made of steel and water under high [[pressure]] flows through the penstock. They are a vital component of a [[hydroelectric facility]] that allows water to move to the turbine.</onlyinclude><ref>Expert Eyes. (August 24, 2015). ''Layout of Hydroelectric Power Plants'' [Online]. Available: http://www.expert-eyes.org/deepak/layout.html</ref> Grates or filters can be attached to the ends of penstocks to trap large debris such as branches. This ensures that debris cannot enter the channel and block it.<ref name="RE1"/>
The amount of water that is allowed to flow through the penstock can be controlled with a gate called a '''[[sluice]]''', which can be raised and lowered to increase or decrease the flow rate.<ref name="RE1" /><ref>Enke Group (2025). (Accessed May 21, 2026). ''What is a Penstock? Applications in Water and Wastewater Treatment Plants'' [Online]. Available: https://enkegroup.com/genel/what-is-a-penstock-applications-water-treatment/</ref> When the sluice is fully open, water flows freely down through the penstock. However, when it is closed slightly the flow rate is reduced, and thus less water enters the penstock and reaches the turbines.  


The amount of water that is allowed to flow through the penstock can be controlled with a '''sluice''', which is simply a gate that can be raised and lowered to increase or decrease the amount of water allowed to flow through.<ref name="RE1">WiseGeek. (August 24, 2015). ''What is a Penstock?'' [Online]. Available: http://www.wisegeek.com/what-is-a-penstock.htm</ref> When the sluice is fully open, water flows freely down through the penstock. However, when it is closed slightly there is a limitation to how much water can flow, and thus less water enters the penstock.
It is important to be able to control the amount of water that can enter the penstock for a number of reasons, primarily to allow people to regulate the amount of water that ''exits'' the penstocks at the other end. During dry seasons, penstocks may be wide open to allow water through, while during wet seasons they are closed partially to prevent flooding. Containment ponds are generally built before the entrance to the penstock to hold water in storage before being let through the penstock. These ponds act to reduce additional pressure on the sluice from the accumulation of stored water.<ref name="RE1"/> The ability to close off the penstocks ensures that they can be regularly inspected, serviced, and repaired. Penstocks require regular cleanings to remove debris and during these cleanings, holes, cracks, and other issues can be discovered and fixed. This helps prevent catastrophic [[dam failures]].<ref name="RE1"/>


It is important to be able to control the amount of water that can enter the penstock for a number of reasons, mainly because it allows people to regulate the amount of water that ''exits'' the penstocks at the other end. During dry seasons, penstocks are generally allowed to be wide open to allow water through, while they are closed partially during wet seasons to prevent flooding. Containment ponds are generally built before the entrance to the penstock to hold water that isn't being let through the penstock. If these were not constructed, the water build-up would put additional pressure on the sluice.<ref name="RE1"/> As well, the ability to close off the penstocks ensures that they can be regularly inspected, serviced, and repaired. The penstocks generally require regular cleanings to remove debris. During these cleanings, holes, cracks, and other problems can be discovered and fixed. This helps prevent catastrophic [[dam failures]].<ref name="RE1"/>
===Size of Penstocks===
<gallery mode=packed heights=200px>
File:Tretheway run of river penstock.JPG|420px|thumb|left|framed|Figure 2. The Tretheway Creek hydroelectric facility has more than 4 km of penstock buried underground.<ref name=tretheway>"Tretheway Creek Project: Transforming Challenges into Opportunities," Canadian Consulting Engineering Awards: Natural Resources, Mining, Industry & Energy Category, 2017. [Online], Available: https://www.canadianconsultingengineer.com/cce/awards/2017/E3_TrethewayCreekHydroelectricProject.pdf</ref>
File:Itaipu penstock and bus picture 2.jpg|350px|thumb|framed|Figure 3. The Itaipu hydroelectric facility has 20 large penstocks. Each penstock is 142.2m long and 10.5m in diameter.<ref name=itaipu/><ref>Wikimedia Commons, October 30, 2006. [Online], Available: https://commons.wikimedia.org/wiki/File:Itaip%C3%BA_-_tubes.jpg</ref>
</gallery>
Depending on the type of [[hydropower]] facility, the size of the penstock will vary. Some facilities have long penstocks, and others have short and wide penstocks. Long penstocks, like the Tretheway Creek hydroelectric facility in Figure 2, are chosen to transport water to a generating station further down the river. Long penstocks are usually used for [[run-of-the-river hydroelectricity|run-of-river hydropower]].<ref name="tretheway" /> Short and wide penstocks, like  in the Itaipu hydroelectric facility in Figure 3, are used to carry a large quantity of water to the turbines. Therefore, the diameter of the penstock also varies dramatically depending on how much water needs to be delivered. The penstocks at the Itaipu hydroelectric facility are 10.5 meters in diameter, approximately the length of a passenger bus (seen in Figure 3).<ref name="itaipu">"Penstocks," Itaipu Binacional, 2010. [Online], Available: https://www.itaipu.gov.br/en/energy/penstocks</ref>
 
==For Further Reading==  
*[[Spillway]]
*[[Hydroelectric facility]]
*[[Hydroelectric dam]]
*[[Primary energy]]
*Or explore a [[Special:Random|random page]]


==References==
==References==
{{reflist}}
{{reflist}}[[Category:Uploaded]]

Latest revision as of 17:16, 4 June 2026

Error creating thumbnail: File with dimensions greater than 12.5 MP
Figure 1. A penstock at a hydroelectric facility.[1]

Penstocks are pipes or long channels that carry water down from the hydroelectric reservoir to the turbines inside the actual power station.[2] They are made of steel and allow water to flow through under high pressure. They are a vital component of a hydroelectric facility that allows water to move to the turbine.[3] Grates or filters can be attached to the ends of penstocks to trap large debris such as branches. This ensures that debris cannot enter the channel and block the flow of water.[4][5]

The amount of water that is allowed to flow through the penstock can be controlled with a gate called a sluice, which can be raised and lowered to increase or decrease the flow rate.[4][6] When the sluice is fully open, water flows freely down through the penstock. However, when it is closed slightly the flow rate is reduced, and thus less water enters the penstock and reaches the turbines.

It is important to be able to control the amount of water that can enter the penstock for a number of reasons, primarily to allow people to regulate the amount of water that exits the penstocks at the other end. During dry seasons, penstocks may be wide open to allow water through, while during wet seasons they are closed partially to prevent flooding. Containment ponds are generally built before the entrance to the penstock to hold water in storage before being let through the penstock. These ponds act to reduce additional pressure on the sluice from the accumulation of stored water.[4] The ability to close off the penstocks ensures that they can be regularly inspected, serviced, and repaired. Penstocks require regular cleanings to remove debris and during these cleanings, holes, cracks, and other issues can be discovered and fixed. This helps prevent catastrophic dam failures.[4]

Size of Penstocks

  • Figure 2. The Tretheway Creek hydroelectric facility has more than 4 km of penstock buried underground.[7]
    Figure 2. The Tretheway Creek hydroelectric facility has more than 4 km of penstock buried underground.[7]
  • Figure 3. The Itaipu hydroelectric facility has 20 large penstocks. Each penstock is 142.2m long and 10.5m in diameter.[8][9]
    Figure 3. The Itaipu hydroelectric facility has 20 large penstocks. Each penstock is 142.2m long and 10.5m in diameter.[8][9]

Depending on the type of hydropower facility, the size of the penstock will vary. Some facilities have long penstocks, and others have short and wide penstocks. Long penstocks, like the Tretheway Creek hydroelectric facility in Figure 2, are chosen to transport water to a generating station further down the river. Long penstocks are usually used for run-of-river hydropower.[7] Short and wide penstocks, like in the Itaipu hydroelectric facility in Figure 3, are used to carry a large quantity of water to the turbines. Therefore, the diameter of the penstock also varies dramatically depending on how much water needs to be delivered. The penstocks at the Itaipu hydroelectric facility are 10.5 meters in diameter, approximately the length of a passenger bus (seen in Figure 3).[8]

For Further Reading

References

  1. ↑ Wikimedia Commons. (August 24, 2015). Yasuoka Power Station Penstock [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/d/dc/Yasuoka_power_station_penstock.jpg
  2. ↑ G. Boyle. Renewable Energy: Power for a Sustainable Future, 2nd ed. Oxford, UK: Oxford University Press, 2004.
  3. ↑ Expert Eyes. (August 24, 2015). Layout of Hydroelectric Power Plants [Online]. Available: http://www.expert-eyes.org/deepak/layout.html
  4. ↑ 4.0 4.1 4.2 4.3 McMahon, M. (2024). (Accessed May 21, 2026) What is a Penstock? [Online]. Available: https://www.aboutmechanics.com/what-is-a-penstock.htm
  5. ↑ Science Insights (2026). (Accessed May 21, 2026). What Is a Penstock and How Does It Work in Hydropower? [Online]. Available: https://scienceinsights.org/what-is-a-penstock-and-how-does-it-work-in-hydropower/
  6. ↑ Enke Group (2025). (Accessed May 21, 2026). What is a Penstock? Applications in Water and Wastewater Treatment Plants [Online]. Available: https://enkegroup.com/genel/what-is-a-penstock-applications-water-treatment/
  7. ↑ 7.0 7.1 "Tretheway Creek Project: Transforming Challenges into Opportunities," Canadian Consulting Engineering Awards: Natural Resources, Mining, Industry & Energy Category, 2017. [Online], Available: https://www.canadianconsultingengineer.com/cce/awards/2017/E3_TrethewayCreekHydroelectricProject.pdf
  8. ↑ 8.0 8.1 "Penstocks," Itaipu Binacional, 2010. [Online], Available: https://www.itaipu.gov.br/en/energy/penstocks
  9. ↑ Wikimedia Commons, October 30, 2006. [Online], Available: https://commons.wikimedia.org/wiki/File:Itaip%C3%BA_-_tubes.jpg
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