8/14/2019 By:AgniKumarMaleku.
BIE/062/02,Emailaddress:[email protected]
1/2
By:AgniKumarMaleku. Article3rdBIE/062/02,
Emailaddress:[email protected]
Submittedto:
Er.GovindaChalise.ButwalPowerCompanyLtd.Baneshwor,Ktm.
Penstock Design considerations:
Abstract:
As water conduit penstock is one of the most required part that
are designed in different
stage and consideration but the most important phase is the
definitive design in which
final design is done on the basis of data available, alignment,
layout and plant operating
characteristics. The detail design is based upon the economical
consideration hence it is
done with the care of economical diameter of the penstock, where
installation cost and
cost of power revenue is considered for the economical diameter.
The scope of this article
is to consider the most important fact that must be considered
during the design with the
aim of saving the unwanted cost with the help of accurate design
and economical
diameter. Hence the accurate design must consider the selection
of the best suitedmaterial incorporated to minimize the life cycle
cost of the water conduit.
Keywords:economicaldiameter,waterconduit,definitivedesign,installationcost.
Introduction:
In the penstock design the available data of layout of terrain,
geology, geography and
other hydrological data the preliminary design are executed for
approximate penstock
design for another step of accurate design in definitive design.
In this phase the detail
calculation of penstock thickness, diameter and total cost of
installation of conduit is
done with the care of material selection, specification of
different test (NDT, DT and
Hydrostatic test) , welding type, handling, shipment cost and
other direct and indirect
factors so, that cost affective and long lasting penstock pipe
can be designed.
Economic diameter:
The diameter of the penstock is calculated with the care of the
energy cost and economic
criteria as well as the cost for the selected steel material and
probable construction costs.
Hence economic diameter is defined as the diameter of the
conduit with the minimization
of the installation cost and power revenue cost. At last in
design the minimum required
thickness of penstock is compared with the thickness required to
resist the internal
pressure and external loads.
8/14/2019 By:AgniKumarMaleku.
BIE/062/02,Emailaddress:[email protected]
2/2
By:AgniKumarMaleku. Article3rdBIE/062/02,
Emailaddress:[email protected]
Submittedto:
Er.GovindaChalise.ButwalPowerCompanyLtd.Baneshwor,Ktm.
Selected concept:
On the basis of the preliminary design of the penstock and best
suited configuration of
the penstock the material selection and the design that minimize
the life cycle cost is
evaluated in this phase. This phase include the selection
process in which different factors
are considered such as preliminary design which includes layout,
geology, configuration
of the terrain and other factors and with the help of
adaptability material selection,
welding type selection and other factors are selected.
Definitive design:
It is the most important phase in which final design related
jobs are carried out with thehelp of preliminary data and data are
compiled with the finalization of the conduit
alignment and layout and confirming the final plant operating
characteristics. And other
most important factor i.e. the characteristics of turbine,
generator, governor and closure
valve must be determined which influences the water hammer
effect. Definite design is
carried out for the following aim:
Physical layout, conduit alignment, supports and anchor block.
Material selection for the penstock, tunnel liners and
appurtenances. Design and service loads. Special consideration for
manufacturing and field installation.
Conclusion:
Hence in the definitive design phase the data related with the
design are compiled for the
detail design with the care of layout, geology, terrain and
other factors from which
economically viable penstock configuration is designed with the
help of data of velocity
of water through turbine, head, discharge, density of water and
material of the conduit
and other constant factors.
