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Table 2

Characteristics of the 1st cycle of pressure wave oscillation in Figure 6 

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) 0.472 0.798 1.31 0.798 1.340 0.748 1.166 0.798 1.360 
Hmax (m) 64.2 50.2 38.9 51.3 38.3 43.2 49.7 51.3 38.2 
Hmin (m) −10.2 −10.2 2.8 −10.2 3.3 −2.4 −9.9 −10.2 3.3 
ΔH+ = HmaxH0 (m) 41.8 27.9 16.5 29.0 16.0 20.8 27.3 29.0 15.9 
ΔH = Hmin− H0 (m) 32.6 32.6 19.6 32.6 19.0 24.8 32.3 32.6 19.0 
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) 0.472 0.798 1.31 0.798 1.340 0.748 1.166 0.798 1.360 
Hmax (m) 64.2 50.2 38.9 51.3 38.3 43.2 49.7 51.3 38.2 
Hmin (m) −10.2 −10.2 2.8 −10.2 3.3 −2.4 −9.9 −10.2 3.3 
ΔH+ = HmaxH0 (m) 41.8 27.9 16.5 29.0 16.0 20.8 27.3 29.0 15.9 
ΔH = Hmin− H0 (m) 32.6 32.6 19.6 32.6 19.0 24.8 32.3 32.6 19.0 
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