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5.2.2 Vacuum lines
As vacuum lines, inelastic PVC pipes and flexible PE tubes are used. PVC hoses are not suitable for vacuum.
Fabric reinforced hoses which should be vacuum-proof are diffused by the chlorine gas and therefore not
resistant. Because of the low pressure, chlorine gas condensation in the vacuum lines is almost impossible.
Only below -30℃ it might become possible. However, temperature must never decrease to such a low level be-
cause considering the embrittlement of the materials. The ejector builds up the vacuum which is necessary for
transporting the chlorine gas. Theoretically the vacuum could amount to a maximum of 1 bar, but the ejector
primes only at a technically reasonable slight vacuum. Therefore the pressure loss resulting from pipe friction
in the vacuum lines must not be higher than 50 mbar. The following table shows the required line cross section
in relation to the length of line and the metering capacity.
Dosing rate
[kg Cl
/h]
2
1
2
3
4
5
7,5
10
Tab.: 3: Maximum length for vacuum lines
The total value of the chlorine gas flow is decisive for the line dimensioning. If for example the line is divided
into two lanes directly in front of the ejectors, the long lane must be dimensioned considering the whole
chlorine gas flow.
100m
2kg/h
Fig. 9: Installation example vacuum line
In this example the long distance is carried out in DN12, and for the relatively short unit connections a 8/12
PE-tube is used.
16 | Operation Manual C 2214 | Installation
DN 8
Hose 8/12
160
50
25
14
9
-
-
1kg/h
DN 12
Hose 12/16
[m]
1100
300
160
100
65
30
20
DN 15
Pipe d 20
4500
950
450
280
190
90
55
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