PSI - Issue 59

Ya. Grudz et al. / Procedia Structural Integrity 59 (2024) 750–756

755

6

Ya. Grudz et al. / Structural Integrity Procedia 00 (2019) 000 – 000

from the beginning of the gas pipeline increases, the indicated deviation increases. Therefore, there is a need to compensate the specified deviation to some extent. For this, it is necessary to know the magnitude and coordinate of the emergency leak, if it exists. It is proposed to analyze the non-stationary process in the gas pipeline caused by the occurrence of an emergency gas leak.

Fig. 2. Evaluation of the impact of road selection on the coefficient of hydraulic efficiency.

The analysis of the graphs shows that an increase in the amount of gas extraction along the way and its distance from the beginning of the gas pipeline leads to a decrease in the coefficient of hydraulic efficiency of the system. If there is a branched gas pipeline of the gas distribution network k-1 concentrated path selections, the distances between which are i l , and the coefficients of hydraulic efficiency on each are i E , then the total coefficient of hydraulic efficiency of the section with selections can be found from the formula

0,5



   

   

2

1

0 l L /

2 E l L q Q / ) / (1  i i



1  k i 

E





q

2

E

0

i

(14)

where 0 l - the length of the section from the beginning of the branched gas pipeline to the first selection. If we consider the gas distribution network as a system of serially connected branched gas pipelines (Grudz et. al. (2014b)), for each of which the coefficient of hydraulic efficiency can be determined by (14) and then the efficiency coefficient by (8), then the overall efficiency coefficient of the network can be determined by (1), which will allow to assess the energy efficiency of the gas distribution network as a whole. 3. Conclusion 1. It is proposed to use the concept of its efficiency to evaluate the energy efficiency of the operation of the gas distribution network. 2. Its dependence on the coefficient of hydraulic efficiency of the network and its sections was established. 3. The principle is shown and calculation formulas are proposed for determining the coefficient of hydraulic efficiency of the network. 4. The analysis of the obtained dependencies showed that in order to increase the value of the coefficient of hydraulic efficiency of the network, high hydraulic efficiency of the initial sections of the gas pipelines of the gas distribution network should be ensured. References

Grudz, Ya. V. 2012. Energy efficiency of gas transportation systems. Ivano - Frankivsk: Lileya - NV. 208 p.