1. Steel Filters

2. We can Provide Steel Filters in a Variety of Configurations
Pressure Types
Standard units available
Many options too
Gravity Types
Specialty Filters

3. Several Design Factors are Important to all Filter Configurations
Process Application
Filter Type
Media Type
Flowrate
2 – 3 gpm/sf – Ten States Standards
4 – 5 gpm/sf – used as well
Backwash Distribution
% bed expansion
Allowable Headloss
Even Water Distribution
Filtering
Backwashing

4. Pressure Filters are Ideal for Groundwater Applications
Fe & Mn removal
Arsenic removal
Maintain Line Pressure (No re-pumping)
They can be used with Pressure Aeration
We offer two configurations
Vertical <700 gpm most economical
Horizontal >700 gpm most economical

5. Vertical Pressure Filter – Standard Configuration Build-Up
50% Freeboard
24” filter sand
10” graded gravel
60” SSH
steel plate underdrain
Backwash Method: Water only from in-service cells

6. Vertical Pressure Filter - Standard
Air Release
Loss of Head gauges
12”x16” manway
Structural steel legs

7. VPF Standard Scope of Supply
100 psi & Non-code
Air/vacuum release valve
12” x 16” manway
Side inlet, bottom head effluent
24” sand on 10” graded gravel
60” Straight Side Height
Underdrain flat steel plate with ABS nozzles
Structural steel legs
Water only backwash
Sherwin Williams exterior prime & interior paint above underdrain

8. VPF - Options Design Pressures: 75, 125,150
Diameter: 4 ft to 12 ft in 6” increments
Larger manways
Pipe header/lateral underdrain
Jack legs
Media
Anthracite, Dual, Mixed
Manganese ANTHRA/SAND or Greensand
Backwash
Air Scour – in-bed air grid
MULTIWASH

9. VPF - Options ASME Construction with stamp Non-code Construction
SA516 gr 70 steel
Inspected & stamped
Ames and Thomasville – certified ASME Shop
Non-code Construction
A36 steel or A516 gr 70 shell plate
Designed to pressure vessel standards with 3.5 safety factor
Gives us an advantage over competition

10. VPF - Options Face Pipe Valves Control
Sch 40 steel with cast iron fittings
Mortar lined ductile iron
Valves
Standard: Bray
Others: Pratt, DeZurik
Control
Manual
Automatic - PLC

11. Horizontal Pressure Filters - Standard
Two sizes: 8 or 10 ft. diameter
Curved plate underdrain with #125 nozzles
Overdrain
24” filter sand
14” graded gravel

12. Inside Horizontal Pressure Filter
Dividing Partition
Curved plate underdrain

13. Horizontal Pressure Filter – Standard Design Features
MULTICELL® design
Common underdrain
Side piped
Skid supported
12”x16” manway per cell and one/underdrain
Air release
Backwash: Water only from in-service cells

14. HPF Standard – Standard Design Features
100 psi & non-code
8 or 10 ft. dia.
Air/vacuum release valve
14” x 18” manways per cell
MULTICELL inlets, common effluent
24” sand on 14” graded gravel
Curved steel plate underdrain with ABS nozzles
Structural steel skid
Water only backwash
Tnemec paint above and below the underdrain

15. Our HPFs Have Many Options Available to Meet Your Customers’ Needs
Length – 12 to 50 ft
Number of cells – 2 to 9
Saddle support
ASME Code construction
Media
Anthracite only, Dual media, Mixed media
ANTHRA/SAND or Manganese Greensand
Piped Header/lateral underdrain
Backwash
Air scour
MULTIWASH

16. HPF Installation

17. Gravity Filters Can be Used for a Wide Variety of Applications
Surface Water
Turbidity Removal
Color Removal
General Solids Removal
The Filter can also be used for
Direct Filtration <25 NTU peak
Conventional Pre-Treatment – Roughing Filter
Two Configurations
Round (tub) <700 gpm
Rectangular >700 gpm

18. Common Gravity Filter Features – Round & Rectangular
Underdrain
Flat steel plate
Common or individual cells
Troughs
Inlet distribution
Backwash waste collection
Flow Control Method
Flow splitting
Effluent rate of flow control
Level Control
Declining rate
Paint
Exterior primer
Interior primer/finish above the underdrain

19. Round Gravity Filters DIAMETER HEIGHT 6” increments Maximum 12 ft dia.
ft max

20. Rectangular Gravity Filters
ALL SIZES
12 ft width maximum
ft max. height
50 ft max. length
TYPE
Shutdown
Continuous
MULTICELL
Single
4 or more cells
INDIVIDUAL CELL EFFLUENT
MULTIBLOCK option
Goldkist, FL – Industrial and DAVCO Install

21. Material Options Provided To Suit Customer Requirements
Steel (Standard)
Stainless Steel
Type 304
Type 316
Aluminum

22. Backwashing Options are Available too
WATER ONLY
AIR FOLLOWED BY WATER
In-bed air grid OR
Below the underdrain
SURFACE WASHERS
MULTIWASH

23. The Filter Media and Underdrain can be Customized for the Duty
Mono
Dual
ANTHRA/SAND
Underdrain Nozzles
Gravel retaining
Media retaining (gravel-less)

24. There are Several Common Control Features
Loss of Head
Tube (Gravity)
Gage (Pressure)
Backwash Rate of Flow
Weir (Gravity)
#1639 Orifice (Pressure)
Automatic Controls
Pneumatic valves
Diff. Pressure Switch
PLC

25. Specialty Filter Designs for Unique Applications
PRESSURE
Ion Exchange
GRAVITY
CenTROL
DuoVAL
overhead storage
Two cell center gullet
Big filter area in small space
Two cells with common gullet

26. ION EXCHANGERS (Softeners)
Process Principles
Design Criteria
Process Scheme
Other Applications

27. Process Principles Trading undesirable ions for desirable ions
“Hard water”
Ca & Mg ions (undesirable)
>150 ppm
“Soft water”
Na ions exchanged (more desirable than hardness)
35 – 150 ppm
120 ppm typical target

28. Zeolite Resin - Cation Poly-styrene gel
Regenerate in place using NaCl (6 lbs/cu.ft. typical)
Life expectancy – 5 to 10 years
Typical capacity: 20,000 grains/cubic foot
Exchange process, not a filter

29. Design Criteria Typical Municipal Target: 120 ppm blended hardness
Iron <0.5 ppm
Chlorine <1.0 ppm
3-5 gpm/sq.ft. loading rate (7 with one unit out of service)
Portion of flow by-passed to obtain desired effluent
Raw water line
By-pass line and meter

30. Softener Internals Brine Distribution Overdrain Ion Exchange Resin
Softened Water
Underdrain
Ion Exchange Resin
Brine Distribution
Support Gravel
Overdrain

31. Process Flow Scheme
Inlet
By-pass
Effluent

32. Typical Scope Two or Three tank system Resin & support gravel
Hardwater bypass
Manual
Automatic
PLC automatic controls
Valves: Butterfly
Sch 40 steel face piping
Flow meters
Brine pump

33. Ion Exchange – Other Applications
Radium Removal (5 pCi/l combined limit)
>95%
Cation resin
Barium Removal (2 ppm limit)

34. In Summary…
We can provide steel filters in a variety of configurations
Pressure Type
Gravity Type
Specialty Filters
Many options are available to suit customer needs!

35. Steel Filters