Sandeep, Your question generates more questions that you will need to answer in order to design your system. Here are a few: 1) What are you trying to filter? TSS, Organics, Iron&Manganese, Etc. Your media will be dependent on your process water specifications required. Your flow rate of 100 m3/hr is about 440 gal/min (gpm). Based on the service rate of the media you choose (expressed in flow per area) usually media's are in the 5 gpm / ft2 to 6.25 gpm / ft2.  The next question is how big do you make your tanks based on this service rate and you BW rate below. Normally you want to size your tanks based on common tank sizes you can manufacture and handle in your area. This flow would normally require (5) 54" dia x 60" side sheet tanks, or (4) 60" dia x 60" side sheet tanks. 2) Your design backwash rate is dependent on the media you choose and the water temperature. Usually you would refer to the manufacturer's media specs. There you will find backwash rate charts based on water temperature. A typical multi-media (gravel, sand, Anthracite) will have a BW rate of 15 gpm/ft2, Next Sand (high performance filtering media) can have a BW rate of 17 gpm / ft2 and Catalytic Media (OxiPlus 75) can be as high as 25 gpm / ft2 of surface area. All these are based on 60 Degrees F. 3) Tanks can be made of Carbon Steel, Stainless Steel or FRP (Fiberglass Reinforces Plastic). If CS is desired then usually the head and shells are of pressure vessel grade quality steel such as SA-516-Grade 70 CS. The attachments such as clips and supports are usually A36 CS. 4) Tank design is usually completed by the supplier of the pressure vessel. But, in most average filtering cases 100 psi (6.9 Bar) is a good average design pressure. Usually this results in a shell wall thickness of 3/16" (4.76mm) and head of 1/4" (6.35mm) depending on temperature. Of course your tank supplier should confirm the calculations based on his procedures, etc. so check with them first. Good luck Regards, Steven Johnson Watersurplus

Published by

Sandeep,

Your question generates more questions that you will need to answer in order to design your system. Here are a few:

1) What are you trying to filter? TSS, Organics, Iron&Manganese, Etc. Your media will be dependent on your process water specifications required. Your flow rate of 100 m3/hr is about 440 gal/min (gpm). Based on the service rate of the media you choose (expressed in flow per area) usually media's are in the 5 gpm / ft2 to 6.25 gpm / ft2.  The next question is how big do you make your tanks based on this service rate and you BW rate below. Normally you want to size your tanks based on common tank sizes you can manufacture and handle in your area. This flow would normally require (5) 54" dia x 60" side sheet tanks, or (4) 60" dia x 60" side sheet tanks.

2) Your design backwash rate is dependent on the media you choose and the water temperature. Usually you would refer to the manufacturer's media specs. There you will find backwash rate charts based on water temperature. A typical multi-media (gravel, sand, Anthracite) will have a BW rate of 15 gpm/ft2, Next Sand (high performance filtering media) can have a BW rate of 17 gpm / ft2 and Catalytic Media (OxiPlus 75) can be as high as 25 gpm / ft2 of surface area. All these are based on 60 Degrees F.

3) Tanks can be made of Carbon Steel, Stainless Steel or FRP (Fiberglass Reinforces Plastic). If CS is desired then usually the head and shells are of pressure vessel grade quality steel such as SA-516-Grade 70 CS. The attachments such as clips and supports are usually A36 CS.

4) Tank design is usually completed by the supplier of the pressure vessel. But, in most average filtering cases 100 psi (6.9 Bar) is a good average design pressure. Usually this results in a shell wall thickness of 3/16" (4.76mm) and head of 1/4" (6.35mm) depending on temperature. Of course your tank supplier should confirm the calculations based on his procedures, etc. so check with them first.

Good luck

Regards,

Steven Johnson

Watersurplus