文章摘要：
Focus On Data Analasis
Of the Cost Of Operation in ComparingWater Pipe
Technical EconomyHuHeng-tai(Dongtai
General Water Supply Company,Jiangsu 224200,China)
......
Focus On Data Analasis
Of the Cost Of Operation in Comparing
Water Pipe
Technical Economy
HuHeng-tai
(Dongtai
General Water Supply Company,Jiangsu 224200,China)
Abstract：By taking thep plastic pipe(PP) and
reinforced pipe(PCP) for example，this paper is to give a
data analysis with a view to the cost of operation
(COO,residual value is during its 30-year life span),
which is worked out by the dynamic analysis method to
compute the lowest cost of water pipe project，with the
employment of the eqcuations of thee:Darcy-weisbach,
Manning and Chezy and the hydralic friction coefficient
as the base.As the flow and pipe
diameter(eg.Q=100,000m3/d，DN1000)being
fixed,the hydralic gradient on the calculating pipeline
is analyzed order compare the difference of the COO and
that of the static cost(maily refferring to the cost of
the pipe material)Prior to comparision,the difference
should be discounted (rate i=10%)into the cost of
investment for a project.Secondly,to compare the
carrying capacity of pipe(CCOP) of the two kinds of pipe
of the same diameter(DN1000)：provided,the outlay exceeds
the COO by 18.8%,the CCOP of the PP will be 35.7％ higher
than the RCP；if the consumption is equal to the COO,the
CCOP will be 27.5％.When the CCOP ie defined as the
same(Q=100,000m3/d),the diameter of the PP
will be smaller than that of the RCP.Also，there will be
reduction in the COO.The above said dynamic cost and
static cost will have a great impact on the cost of
work,and are very likely to choice of a
plan.
Keywords：comparing technical
economy；cost of operation(COO)；data
analysis；discount；cost of work；hydraulic gradient
工程设计方案技术经济比较的实质，就是各方案所体现的经济效果，即能以最少的人力、物力、财力消耗获得最佳的工程效益。为了正确评价方案经济效果的优劣，人们意识到“资金的时间价值”以后，感觉到“动态分析法”比“静态分析法”更符合客观经济规律。然而，采用了正确的评价方法，不等于评价出的结果就一定正确，因为人们往往对动态成本即常年运行费用等经常性的成本并未做出具体的量化分析，只是作出定性的说明，凭经验估计其数值的大小，缺乏足够的依据，准确度低。本文针对这—情况，结合工程实例，采用“最低成本法”，以两种典型管道—塑性管与钢筋混凝土管为例，比较两方案的经济性。所谓“最低成本法”是“净现值法”的一种应用，对静态投资和常年运行费用折现计算，从所需费用的多少角度来评价，以成本净现值小的方案的为优。为简化计算，笔者仅对占工程成本主要部份的管道材料费、常年运行费用(能耗)的折现值差额来进行比较，为方案的整体评价提供依据。
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