CEA 4001 - Pressure Tanks

54
T
Table 14: Minimum width of settling chambers, suction pits, open channels and weirs
0,25m < d* < 0,5m
0,5m < d* < 1,0m
d* < 1,0m
width
m
maximum flow l/min
width
m
maximum flow l/min
width
m
maximum flow l/min
0,088
0,125
0,167
0,215
0,307
0,334
0,410
0,500
0,564
0,750
1,110
1,170
1,500
2,000
4,500
280
497
807
1 200
2 060
2 340
3 160
4 190
4 950
7 260
12 050
12 800
17 380
24 400
60 300
0,082
0,112
0,143
0,176
0,235
0,250
0,291
0,334
0,361
0,429
0,527
0,539
0,600
0,667
0,819
1,000
522
891
1 380
1 960
3 160
3 510
4 480
5 590
6 340
8 310
11 420
11 820
13 900
16 270
21 950
29 170
0,078
0,106
0,134
0,163
0,210
0,223
0,254
0,286
0,306
0,353
0,417
0,425
0,462
0,500
0,581
0,667
2,000
993
1 690
2 590
3 630
5 650
6 260
7 830
9 580
10 750
13 670
18 070
18 640
21 410
24 400
31 140
38 910
203 300
* Dimension d in Figure 5.
NOTE
: for dimensions not included in this table, the conduit shall be designed such that the water vel
ocity
does
not exceed 0,2m/s.
Two screens shall be provided, with one in use and the other in a raised position ready for interchange when
cleaning
is necessary.
8.4.1.6
Where the suction inlet draws from a walled off area of the bed of the river, canal, lake etc., the
wall
itself shall be extended above the water surface with an aperture screening arrangement. Alternatively,
the
space between the top of the wall and the water surface shall be enclosed with a screen. Screens shall be
as
specified in 8.4.1.4.
8.4.1.7
Excavation of the bed of the lake etc., to create the necessary depth for a pump suction inlet is
not recommended, but if unavoidable the area shall be enclosed with the largest screen practicable, but in
any case having sufficient clear area as specified in 8.4.1.4.
8.5 Pressure tanks
8.5.1 General
A pressure tank is a tank containing water under air pressure which shall be sufficient to ensure that all the
water
can be discharged at the necessary pressure.
The pressure tank shall be reserved solely for the sprinkler system.
The pressure tank shall be easily accessible for external and internal inspection. It shall be protected against
corrosion
both internally and externally.
The discharge pipe shall be situated at least 0,05m above the bottom of the tank.
8.5.2 Housing