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Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 195
pipes, AP – annual total cost for pumping and A - the annual average cost
associated to the investments in the usage’s conditions of the following
parameters: ac = 0,075; a = 6000; α = 2; k – pipe’s equivalent absolute rugosity
= 0,8 mm; Kj = 0,00145; γ = 2; β = 5,143+0,131.k; ηp = 72 %; T = 6200
hours/year; αp = 0,46; Ipo = 65; Q = 0,15 m 3 /s; D = 0,3; 0,4; ...; 0,6 m.
4. Conclusions
1. It comes out that chlorine and ammonium concentrations grow up in the
maximum consumption period of network: Cl = (1,1 ÷ 2,89) [mg/l] and Am =
(42,55 ÷ 43,31) [mg/l]. In the same time, pressure and debit grow up because to
the increase of the active consumers number in the network: p = (3,01 ÷ 4,09)
[bar] and Q = (0 ÷ 1650,74) [m 3 /h].
2. The water turbidity grows up at (0,49 ÷ 0,59) FNU values on starting
and stop period for each pumps. In short time from the starting and stop
moment, the turbidity declines at (0,26 ÷ 0,30) FNU values. The water’s
conductivity is constant (0,53 ÷ 0,54) [mS/cm].
3. The flow and load variation from hydraulic system influence the water
quality and the substances quantity imperative for the drinkable water treatment:
in the analyse period 1.05.2009, 00:00 hour and 15.05.2009, 23:55 hour,
maximum chlorine is Clmax = 3,94 [mg/l] in 7.05.2009 day, 3:45 hour; at same
moment the hydraulics system has the following parameters: Tb = 0,42 FNU
turbidity, Q = 0,121 [m 3 /s] flow, H = 69,34 [m] load, Cv = 0,51 [mS/cm]
conductivity. The minimum chlorine is Clmin = 1,1 [mg/l] in 3,05.2009 day, 3:35
hour; the parameters of the CUG pumping station at same moment are: 3:35
turbidity, Q = 0 [m 3 /s] flow, H = 64,344 [m] load, Cv = 0,52 [mS/cm]
conductivity.
Acknowledgements. This work has been supported by the National Centre of
Management Programmers, Romania, under financial contract No. 21-041/2007.
Received: February 25, 2010 “Gh. Asachi”Technical University,
Department of Fluid Mechanics, Machines and Hydraulic Acting,
Iasi, Romania,
e-mail: auralexis@yahoo.com
R E F E R E N C E S
1. A l e x a n d r e s c u A., Statii de pompare, Ed. Politehnium, Iasi, 2008.
2. A l e x a n d r e s c u A., Masini si echipamente hidraulice, Ed. Politehnium, Iasi,
2008.