W 118 Technical Rule - Standard 07/2005 -PDF file-
Dimensioning of vertical filter wells
- Herausgeber/Verlag: DVGW
- Format: 24 pages
- Material: available as PDF only
- Ausgabe: 1st edition 2005
- Hinweis: German version W 118
- Verkaufseinheit: 1
- Mindestabnahme: 1
- Artikel-Nr.: 510398
62,03 €*
This Code of Practice W 118 serves as basis for the hydraulic and mechanical dimensioning of wells. The references listed represent the minimum requirements on the dimensioning of vertical filter wells.Well dimensioning shall be performed so that a hydraulically effective, functionally reliable and economic water abstraction from the aquifer is guaranteed in the long run. At the same time, apart from the Basic hydrogeological parameters, the operating company's technical specifications and the well construction technology are of importance. A careful selection from the various options in well dimensioning can often minimise problems during later well operation, for instance ageing phenomena.For the planning specialists in drilling and well construction companies, engineering offices and water utilities, the code of practice shall provide assistance for the hydraulic and static dimensioning of vertical filter wells.
Preamble
1 Scope
2 Normative references
3 Definitions
3.1 Erosion
3.2 Colmation
3.3 Suffosion
4 Principles of well dimensioning
5 Dimensioning
5.1 Hydraulic dimensioning
5.1.1 Principles
5.1.2 Dimensioning the well filter
5.1.2.1 Colmation safety
5.1.2.2 Slot/gap width of the well screen
5.1.2.3 Well screen length
5.1.2.4 Well screen diameter
5.2 Static dimensioning
5.2.1 Principles
5.2.2 Tensile strength
5.2.2.1 General
5.2.2.2 Verification procedure
5.2.2.3 Determination of weight force
5.2.2.4 Verification of tensile strength
5.2.3 External pressure strength
5.2.3.1 General
5.2.3.2 Verification procedure
5.2.3.3 Determination of the acting external pressure
5.2.3.4 Verification of external pressure strength
Annex A (informative)
Annex B (informative)
Annex C (informative)
C.1 Boundary conditions
C.2 Hydraulic dimensioning
C.2.1 Verification of colmation safety according to 5.1.2.1
C.2.2 Verification of slot/gap width of well screen according to 5.1.2.2
C.2.3 Verification of well screen length according to 5.1.2.3
C.2.3 Verification of well screen diameter according to 5.1.2.4
C.3 Static dimensioning
C.3.1 Verification of tensile strength according to 5.2.2
C.3.2 Verification of external pressure strength according to 5.2.3
Bibliography
1 Scope
2 Normative references
3 Definitions
3.1 Erosion
3.2 Colmation
3.3 Suffosion
4 Principles of well dimensioning
5 Dimensioning
5.1 Hydraulic dimensioning
5.1.1 Principles
5.1.2 Dimensioning the well filter
5.1.2.1 Colmation safety
5.1.2.2 Slot/gap width of the well screen
5.1.2.3 Well screen length
5.1.2.4 Well screen diameter
5.2 Static dimensioning
5.2.1 Principles
5.2.2 Tensile strength
5.2.2.1 General
5.2.2.2 Verification procedure
5.2.2.3 Determination of weight force
5.2.2.4 Verification of tensile strength
5.2.3 External pressure strength
5.2.3.1 General
5.2.3.2 Verification procedure
5.2.3.3 Determination of the acting external pressure
5.2.3.4 Verification of external pressure strength
Annex A (informative)
Annex B (informative)
Annex C (informative)
C.1 Boundary conditions
C.2 Hydraulic dimensioning
C.2.1 Verification of colmation safety according to 5.1.2.1
C.2.2 Verification of slot/gap width of well screen according to 5.1.2.2
C.2.3 Verification of well screen length according to 5.1.2.3
C.2.3 Verification of well screen diameter according to 5.1.2.4
C.3 Static dimensioning
C.3.1 Verification of tensile strength according to 5.2.2
C.3.2 Verification of external pressure strength according to 5.2.3
Bibliography