Product oil measuring is very important for oil sale companies, it is one of factors in sale deliver, cost analysis, loss control and cost decrease, which affects the profits of sellers and buyers directly.

On hydraulic calculation of fire sprinkler system;

This paper analyzes the principle and step of the steam pipes hydraulic computation.

In this paper,we present a simple and convenient calculation modelrecursive algorithm for hydraulic computation of tree structure distribution pipe network,which establishes the topological relationship between water meters,pipe lines and openings under the GIS(Geographic Information System) environment,and analyzes the node discharge according to the volume measured.

The hydraulic computations of the pipe-flows have been a little complicated for they have encountered a problem of the implicit form of the Colebrook-Write equation.

The waterpower calculation table exploitation and its application about low pressure branch gas pipelines;

From the waterpower calculation of the culvert gate,it discusses the rainwater drainage and flood close in Maoming city,does waterpower calculation to the culvert gate by three fluxs according to the total flux,and the cavity width is selected.

It is suggested that the evaluation of product cost should take more consideration of relative costs and invisible costs, such as developing cost, environmental cost, human resource cost, invisible capital, as well as the costs closely related to product life.