Computational Model for Water Hammer Disaster - Advances in Control and Automation of Water Systems - page 157

( ) ( )

C gV / - V + H + H

Le ri Le ri

H = 1/ 2 ,

(18)

) (

)

P

(

- Cgf t DV / ∆ /2 V - VV

Le Le ri ri

9.3 results And discussion
Local leakage effect on high pressure drop in water pipeline. For make decision about
reclamation of leakage in water transmission line, it was investigated the water ham-
mer modeling for three cases at leakage point [6-10]:

• Simulation of pipeline (Figure 8.2) for reclamation numerical analysis of water
transmission line by replace of present reinforced concrete pipe (AC pipe) with
the same diameter of polyethylene pipe (AC pipe-1,200 mm replace with PE
pipe-1,200 mm).
• Simulation of pipeline (Figure 8.3) for reclamation numerical analysis of water
transmission line by lining (push a new smaller diameter pipe into the old larger
diameter pipe-

Push PE pipe-1,100 mm into AC pipe-1,200 mm).
• Simulation of pipeline (Figure 8.3) for reclamation numerical analysis of water
transmission line by replace of present reinforced concrete pipe (AC pipe) with
the larger diameter of polyethylene pipe (AC pipe-1,200 mm replace with PE
pipe-1,300 mm).

tABle 9.1 Heterogeneous Model (Software Hammer Version 07.00.049.00).

Type Keyword Value

1 Title numerical Modeling of fluid interaction by Method of

characteristics “MOC”-
Rasht city water pipeline in the north of Iran.

2 Units for Flow cms

3 Units for Head m

4 Units for Volume m3

5 Units for Diameter mm

6 Units for Length m

7 Units for Mass kg

8 Time Increment 0.0148

9 Number of Time Steps 339

10 Simulation Time 5.003

11 Wave Speed 1084

12 Vapour Pressure -10

13 File Name E:\k-hariri Asli\ surge tank-leakage-inp

14 Date of Run 10/10/2008

15 Time of Run 11:09.4

16 Number of Nodes 27