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Table 1

Characteristics of the 1st cycle of pressure wave oscillation in Figure 3 

ParametersOriginal systemProtected systems
Inline (sub)-short-section
Branching (sub)-short-section
(HDPE)(LDPE)(HDPE/HDPE)(LDPE/HDPE)(HDPE(LDPE)(HDPE/HDPE)(LDPE/HDPE)
T1 (periods) (s) 0.420 0.756 1.18 0.876 0.612 0.904 0.944 0.904 0.944 
Hmax (m) 85.6 79.0 66.6 75.4 84.1 80.10 67.60 71.6 80.4 
Hmin (m) 5.4 15.5 26.1 20.6 20.1 11.40 24.90 22.2 8.2 
ΔH+ = HmaxH0 (m) 40.6 34.0 21.6 30.4 39.1 35.1 22.6 26.6 35.4 
ΔH = Hmin− H0 (m) 39.6 29.5 18.9 24.4 24.9 33.60 20.10 22.8 36.8 
ParametersOriginal systemProtected systems
Inline (sub)-short-section
Branching (sub)-short-section
(HDPE)(LDPE)(HDPE/HDPE)(LDPE/HDPE)(HDPE(LDPE)(HDPE/HDPE)(LDPE/HDPE)
T1 (periods) (s) 0.420 0.756 1.18 0.876 0.612 0.904 0.944 0.904 0.944 
Hmax (m) 85.6 79.0 66.6 75.4 84.1 80.10 67.60 71.6 80.4 
Hmin (m) 5.4 15.5 26.1 20.6 20.1 11.40 24.90 22.2 8.2 
ΔH+ = HmaxH0 (m) 40.6 34.0 21.6 30.4 39.1 35.1 22.6 26.6 35.4 
ΔH = Hmin− H0 (m) 39.6 29.5 18.9 24.4 24.9 33.60 20.10 22.8 36.8 
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