TowerSystem  Filtration  Systems:  FTS SERIES                     Revised 2-20-01

Sample Specifications

Filtration Type & Performance
The removal of specific unwanted contaminants from a pumped/pressurized fluid flow system shall be accomplished with a sand media filtration package.  Performance shall be prescribed for matter as fine as 5 microns, based on the specific sand media employed. 

Filtration System Design & Function
A system-matched pump directs the fluid through a 3-way valve into the top inlet of a sand media filter tank.  Flow is evenly dispersed across the sand media bed, allowing the fluid to pass through the sand media and capturing the contaminants on the surface and upper layer of the sand media.  Fluid flow continues through the sand media to the filter tank's integral underdrain, directing water to the filter system's outlet.

Backwashing/Contaminant Removal
The accumulation of contaminants on the sand media surface shall be monitored via pressure differential from inlet to outlet.  At a prescribed pressure differential or a given period of time or operator discretion, the filter system shall backwash the captured contaminants to desired waste.  This function shall be a) automatically controlled via a pressure differential gauge and clock timer, or b) manual, monitored and initiated by an operator.

The 3-way valve at the inlet shall be actuated electrically or manually to interrupt system flow and provide a backwash discharge outlet.  Backwash flow shall come from either a) the system flow, redirected through filter tank's outlet and underdrain, or b) a separate flow source, such as city water, directed through the filter tank's outlet and underdrain.  

Backwash flow and pressure shall be sufficient to fluidize the sand media bed and cause the surface contaminants to rise in suspension and discharge via the 3-way valve to desired waste.  

Upon completion of the backwashing cycle, the inlet's 3-way valve shall again return to its operating position, allowing system flow to enter the filter tank and simultaneously interrupting backwash discharge.  This allows the sand media bed to again settle, forming the filtration surface for further contaminant removal.

continued on reverse     	

Filter System Details
A. Inlet shall be female threaded, NPT, size: __________
B. Outlet shall be female threaded, NPT, size: ________
C. Backwash discharge outlet shall be female threaded, NPT, size: __________
D. Backwash supply line (if not using redirected system flow) shall be female threaded, NPT, size: ___________
E. The filter system shall operate at a flow rate of: __________
F. Pressure loss shall not exceed the clean filter's operating pressure loss by more than 10 psi (0.7 bar) 

Filter System Construction
Filter tank -  Molded FRP (fiberglass-reinforced polyester).

Underdrain - PVC manifold with ABS hub and laterals.

Pump - Stainless steel, TEFC centrifugal.  Plastic pre-strainer.

Backwash valves - Manually or electrically actuated 3-way valves, bronze.

Controller - IEC starter with overload module; HOA selector switch; NEMA-4X 
enclosure; re-set/disconnect/trip switch; 120 volt, single phase control voltage; manual backwash switch; pressure differential switch; backwash cycle timer; 24-hour backwash clock.

Piping - Schedule 80 PVC.

Filter media - Uniformly graded silica sand media; options:
* 10 microns at 95% efficiency
* 5 microns at 90% efficiency

Skid - Stainless steel, 3/16-inch minimum thickness.

Filtration System Source & Identification
The filter system shall be manufactured by LAKOS Filtration Systems, a division of Claude Laval Corportation in Fresno, California USA.  Specific model designation is: __________________