Computational Model for Water Hammer Disaster - Advances in Control and Automation of Water Systems - page 160

tABle 9.3 (Continued)

Point Distance Elev. Init Head Max Head Min Head Vapor Pr.

P3:60.00% 186.6 36.2 131.3 134.7 103.5 .000 -10.0

P3:65.00% 202.2 36.2 131.2 134.4 103.4 .000 -10.0

P3:70.00% 217.7 36.2 131.1 134.6 102.9 .000 -10.0

P3:75.00% 233.3 36.2 130.9 134.4 102.7 .000 -10.0

P3:80.00% 248.8 36.1 130.8 134.0 102.7 .000 -10.0

P3:85.00% 264.4 36.1 130.7 133.9 102.4 .000 -10.0

P3:90.00% 279.9 36.1 130.6 133.6 102.3 .000 -10.0

P3:95.00% 295.5 36.1 130.4 133.5 102.1 .000 -10.0

+ P3:J8 According to pipeline specification three models were defined. The leakage
point (+ P3:J7) as the most important critical point (Table 9.3) was selected for analy-
sis by above three models for pipeline reclamation numerical analysis. Comparison of
these three cases revealed the reclamation numerical analysis curves as long as water
transmission line at transient flow condition (Figure 9.2-9.5).
All of these numerical analysis curves confirmed the critical effect of leakage point
for make decision about reclamation of present water transmission line. For all three
models were showed the numerical analysis of existent pipe reclamation (reinforced
concrete pipe replacement with the offered polyethylene pipe) as flowing procedure
[11-12]:

1. Max. Pressure-Distance; Min. Pressure-Distance curves shows pressure de-
creased after the leakage point (+ P3:J7) .Pressure drop is high proportional to
diameter increasing (Figure 9.2-9.5).
2. Max . Pressure-Distance curve shows pressure rising before the leakage point
(+ P3:J7). Pressure rising became low and low proportional to diameter in-
creasing (Figure 9.2-9.5).
3. Min. Pressure-Distance curve shows pressure decreasing before the leakage
point (+ P3:J7). So pressure drop became low and low proportional to diameter
increasing (Figure 9.2-9.5).
4. With polyethylene pipe diameter increasing at the leakage point (+ P3:J7),
Min. Pressure and Max. Pressure drop happened at the near of pump station
location (Figure 9.2-9.5).
5. Max . Pressure drop happened when diameter changed from small diameter
to large diameter. Min . Pressure drop happened when diameter changed from
large diameter to small diameter.
6. 5-pressure variation (Figure 9.2-9.5) interval decreased by diameter increasing
at the leakage point (+ P3:J7).

Reclamation numerical analysis modeling showed the best construction way for
water transmission line was the lining of present reinforced concrete pipe (AC pipe).
This variant for reclamation was based on lining of present reinforced concrete pipe