An urban gas network water blocking situation was introduced,through analyzing urban gas network water blocking accidents origin reasons,the corresponding resolving method was proposed,the water blocking exclusive construction method and attentions were generalized so as to avoid or reduce gas network water blocking accident occurrence.

Based on the pipeline jam accidents appeared during the 13th high pier pumping construction of concrete for Fengshihe Bridge of Jishao Expressway and according to related codes,we make a careful analysis of the causes of pipeline jam,and put forward corresponding measures.

For the purpose of promoting the safe production and effectively preventing water inrush disaster,this paper summarized the basis and method for the mining district division under pressure.

The thesis takes eight coal mins as examples in different areas of the Xinglong county and uses grey interrelation assessment model to analyze quantificationally a good many non-linear and dynamic factors which effect water inrush disaster in coal mine,and then gets an actual result,finally finds the true reason why the disaster happened.

PWR LOCA Analysis with Condensation Reflux Model;

Simulation of LOCA in the auxiliary primary loop system of nuclear power plant;

Realistic Analysis of Intermediate and Small LOCA;