Automatic backwash sand filter bypass filtration
Cooling towers recirculation water is large in volumes and gets easily contaminated with suspended solids, atmospheric dust, microbiological organisms, various airborne debris and sometime particulate of rusted metal coming out from heat exchangers. These contamination and impurities get settled either in cooling tower pond or deposit on the surface of Heat exchangers and significantly decrease the performance of cooling tower circuit. Under these circumstances, significant improvement might be realized with the use of a side stream filter and pond cleaning accessories.
Our unique design of Side Stream Filter and cooling tower pond accessories ensures efficient & effective removal of suspended solids & other contaminations and reinforce healthy conditions of cooling tower and associated heat exchangers.
SSF are available in diameters from 0.225 Mts. to 4.0 Mts.(vertically) and in length from 3.0 Mts. mm to 11 Mts. (Horizontally) with flow rates up to 500M3/Hr. These rugged, pre-engineered, pre-assembled units minimize installation and start-up costs.
Working Principle
Working principle
For the by-pass filtration, the filter is installed in the main circulating pipeline to filter all the circulating water, but a part of the circulating water flows from the main circulating pipeline is filtered, which is a repeated circulating interception step by step to filter the impurities within the system and finally remove the impurities by the necessary backwash out of the system. Installing a by-pass filter in the circulating water system can prevent the terminal pipe of device from sludge blocking and remove the impurities in the system with chemical dosing.
By-pass filtration is used to reduce the turbidity of the water circulation system, exactly, to reduce slime and prevent its deposition in the heat exchanger, so that the effect of agent will be better.
Generally speaking, if your filter is a quartz sand filter, it usually has two main functions:
1. To reduce suspended solids (turbidity). Otherwise, as the system is running, suspended solids increases, which will exacerbate the deposition and other problems.
2. Degreasing. Especially the oily turbid circulation, such as steel rolling and continuous casting, has high oil content and is easy for breeding microorganism and blocking the nozzles.
Technical description of by-pass filter for the industrial circulating water
Flow filter flow is designed according to 5% to 10% of the total circulation volume (the by-pass filter flow of the cooling water is designed by 10 % of the circulation volume and the by-pass filter flow of chilled water is designed by 5% of the circulation volume) and the filtration rate is designed by 20 - 3Smih according to water quality of the system. Specific to corrosive suspended solids of the circulating water system as well as the control, our technical support team has designed a variety of manual/automatic by-pass filtrating equipment in line with customer demand.
The characteristics of the filtration system
1. Manual or automatic control is available;
2. Water distributor is simple, uniform and reliable;
3. Finished water collector has high strength and long service life;
4. Easy to install. Only connect the inlet and outlet to the waste pipe when installing;
5. Less water consumption in backwash: A homogeneous filter is used, so that backwash cycle is extended and the total backwash water volume is greatly reduced;
6. High backwash efficiency: An advanced water collector is used, ensuring efficient backwash effect.
Technical parameters sheet for Shallow Sand Filter (Bypass Filtration Sand Filter)
| model |
Filter diameter |
Height |
inlet-outlet |
filtration area |
capacity |
| mm |
mm |
mm |
m² |
m³/hour |
| YL-SSF-500 |
500 |
816 |
40 |
0.2 |
6~10 |
| YL-SSF-600 |
600 |
874 |
40 |
0.28 |
8~14 |
| YL-SSF-700 |
700 |
900 |
40 |
0.38 |
12~19 |
| YL-SSF-800 |
800 |
960 |
DN50 |
0.50 |
15-25 |
| YL-SSF-1000 |
1000 |
1200 |
DN50 |
0.79 |
23-39 |
| YL-SSF-1200 |
1200 |
1400 |
DN80 |
1.13 |
33-55 |
| YL-SSF-1400 |
1400 |
1600 |
DN100 |
1.54 |
45-75 |
| YL-SSF-1600 |
1600 |
1800 |
DN100 |
2.01 |
60-100 |
| YL-SSF-1800 |
1800 |
1950 |
DN150 |
2.54 |
75-125 |
| YL-SSF-2000 |
2000 |
2150 |
DN150 |
3.14 |
95-155 |
| YL-SSF-2200 |
2200 |
2250 |
DN150 |
3.80 |
115-190 |
| YL-SSF-2400 |
2400 |
2100 |
DN150 |
4.52 |
130-210 |
| YL-SSF-2600 |
2600 |
2400 |
DN150 |
5.30 |
145-225 |
| YL-SSF-2800 |
2800 |
2500 |
DN200 |
6.15 |
155-240 |
| YL-SSF-3000 |
3000 |
2600 |
DN200 |
7.00 |
170-255 |
| YL-SSF-3200 |
3200 |
2800 |
DN250 |
8.15 |
270-320 |
| YL-SSF-3400 |
3400 |
3000 |
DN300 |
9.2 |
350-400 |
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