Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experience in operating HES wooden penstocks
Conclusions 1. Wooden penstocks are not sufficiently dependable in operation when there is water hammer or a decrease in internal pressure. This must be kept in mind in specifying the regulation regime of the turbine. To prevent the forming of a vacuum air relief openings and vacuum valves must be installed at 50–75 m intervals. 2. The service life of wooden penstocks is determined by wear and rotting of the staves and can amount to 35–50 years (the rate of wear is 0.75–1.25 mm/year). The wear of the staves, especially at transverse joints, increases the roughness and head loss in the penstock. 3. Wooden penstocks require careful and constant maintenance. To prevent the rotting of the stave on the outside the surface of the penstock must be kept clean. Special attention must be paid to uniform tightening of the bands. Periodic checking of their tension is necessary. 4. Compacting transverse joints with oak or metal wedges does not work because it makes it extremely difficult to replace staves during repair. Incorrect position of the wedges when the penstock is being assembled causes splitting of the stave and leaks in the joints. Good compaction of transverse joints is accomplished with wedge inserts (Fig. 2) which greatly simplifies the replacement of individual staves during repair and the assembly of a new pipe. 5. With good compaction and good maintenance wooden penstocks are practically water tight. There is no sense in setting up any standars for the allowable leakage.
Experience in operating HES wooden penstocks
Conclusions 1. Wooden penstocks are not sufficiently dependable in operation when there is water hammer or a decrease in internal pressure. This must be kept in mind in specifying the regulation regime of the turbine. To prevent the forming of a vacuum air relief openings and vacuum valves must be installed at 50–75 m intervals. 2. The service life of wooden penstocks is determined by wear and rotting of the staves and can amount to 35–50 years (the rate of wear is 0.75–1.25 mm/year). The wear of the staves, especially at transverse joints, increases the roughness and head loss in the penstock. 3. Wooden penstocks require careful and constant maintenance. To prevent the rotting of the stave on the outside the surface of the penstock must be kept clean. Special attention must be paid to uniform tightening of the bands. Periodic checking of their tension is necessary. 4. Compacting transverse joints with oak or metal wedges does not work because it makes it extremely difficult to replace staves during repair. Incorrect position of the wedges when the penstock is being assembled causes splitting of the stave and leaks in the joints. Good compaction of transverse joints is accomplished with wedge inserts (Fig. 2) which greatly simplifies the replacement of individual staves during repair and the assembly of a new pipe. 5. With good compaction and good maintenance wooden penstocks are practically water tight. There is no sense in setting up any standars for the allowable leakage.
Experience in operating HES wooden penstocks
Varaksin, V. A. (Autor:in) / Palvanov, A. M. (Autor:in)
Hydrotechnical Construction ; 1 ; 820-822
01.09.1967
3 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Experience in operating HES wooden penstocks
| Online Contents | 1967
Experience gained in operating a hydroelectric power station with wooden penstocks
| Springer Verlag | 1967
Experience gained in operating a hydroelectric power station with wooden penstocks
| Online Contents | 1967
Online Contents | 1994
Service record experience of steel penstocks
| Engineering Index Backfile | 1965