Table 2: Selected impulse unit speed drop characteristics
Unit |
Penstock length (m) |
Max sound wave a m/s |
J ratio |
Waterham ratio |
10% Jet time, Te |
Speed Drop % |
Regulation rank |
|
|
|
New |
Old |
Achachicala |
1,532 |
1,352 |
2.50 |
0.134 I |
0.90 |
2.83 |
5 |
6 |
Angostura |
1,070 |
1,252 |
1.30 |
0.193 I |
0.90 |
4.91 |
8 |
7 |
Botijlaca |
406 |
1,216 |
1.14 |
0.141 N |
1.20 |
6.48 |
9 |
9 |
Cat Arm |
2,900 |
1,100 |
1.54 |
0.067 I |
0.90 |
0.99 |
1 |
1 |
Corani |
1,158 |
1,052 |
1.15 |
0.080 I |
0.80 |
1.91 |
3 |
3 |
Cuticucho |
1,207 |
1,270 |
1.08 |
0.098 I |
0.60 |
2.53 |
4 |
4 |
Miguilla |
1,323 |
1,243 |
2.54 |
0.130 I |
0.73 |
1.76 |
2 |
2 |
Santa Rosa #1 |
330 |
1,070 |
1.07 |
0.225 I |
0.60 |
4.60 |
7 |
5 |
Santa Rosa #2 |
1,274 |
1,224 |
1.05 |
0.060 I |
1.40 |
3.73 |
6 |
8 |
Zongo #1 |
1,117 |
1,292 |
2.79 |
0.249 N |
2.10 |
9.74 |
10 |
10 |
N = normal waterhammer, I = instantaneous waterhammer.
New regulation rank based on speed drop, old from Table 1.
|