#SC 40RT 06 – 101027Page 18 of 44
B) Calculation of cleaning time for getting out a certain amount of
cleaning media (prewash)
- The total flow Q (m³/h) through the nozzles is calculated by adding the flow for
each machine operating in the tank at the specific pressure used. See table under
“4. Technical Data” on page 7.
- Needed amount of washing media R (m³) calculated as per Prewash Regulations.
- The time T the machine must be in operation is then calculated as:
T =
Rx60
Q
(min)
Example 2:
- Prewash rules gives that 6 m³ of cleaning media should be used.
- We have a tank with two (2) machines, each with a Ø10 mm nozzle, and will
operate the tank cleaning machine at 12 bar pressure.
- How long time should we operate the machine?
Solution
Table at page 8 shows that at 12 bar and 2 x Ø10 mm nozzle will give a flow of 27
m³/h per machine. Total flow will then be calculated by adding the flow of both
machines, giving a total flow in the tank of 54 m³/h.
Needed time T =
6x60
54
~ 6,7 min
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