Calculation of RO System Cleaning Tank Volume

The cleaning tank of the reverse osmosis system is required to be protected against corrosion. The material may be glass fiber reinforced plastic, polyvinyl chloride plastic, or steel tank lined rubber. Due to the specific temperature requirements of RO membranes, in some particularly cold or hot areas, the installation of heating or cooling devices inside the enclosure should be considered. General requirements for cleaning temperature not less than 15 Â°C, because the temperature is low, it will affect the cleaning effect.

When determining the volume of the cleaning tank, the volume of the pressure vessel, the volume of the security filter, the volume of the circulation pipe, etc. should be considered.

For example: The RO membrane module of a factory adopts a 6-3 arrangement, that is, there are six 8-inch membrane modules in the first stage, three 8-inch membrane modules in the second stage, and six 40-inch membranes in each membrane module. element.

The cleaning tank volume can be calculated as follows:
1) Each pressure vessel volume:
V1=1/4*Ï€*D2*L=3.14/4*[(25.4*8)/1000]2*6=0.1884m3
9 pressure vessel volumes:
V2=0.1884*9=1.6956m3
Assuming that the membrane element occupies 30% of the pressure vessel volume, the volume of water stored in the 9 pressure vessels is:
V3=1.6956*70%=1.1869m3
2) The length of water stored in the pipeline is 50m long (Ï†89*3.5 lining hose):
V4=1/4*Ï€*D2*L=3.14/4*0.0822*50=0.264m3
3) With Ï†600 and effective height of 1.3m, the volume of water stored in the security filter is:
V5=1/4*Ï€*D2*H=3.14/4*0.62*1.3=0.3674m3
With a filter that accounts for 5% of the filter volume, the volume of water stored in the filter is:
V6=0.3674*95%=0.349m3
4) Total volume:
V= V3+V4+V6=1.1869+0.264+0.349=1.8m3
Taking into account unforeseen factors, the total volume is multiplied by a factor of 1.2.
V'=1.2V=1.2*1.8=2.16m3
Considering the cleaning cycle, the cleaning tank should have a storage volume of 0.5m3, so the calculated volume is:
V"=2.16+0.5=2.66m3

From the above, the cleaning tank can choose a volume of 3m3.

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