Receiver We recommend the use of only ASME code receivers. The pressure rating on the receiver must be consistent with the intended working pressure and applicable codes.

Valves For sizes 2" and larger we recommend the use of lug type butterfly valves with ductile iron bodies and stainless steel disc and stem. Ductile iron is preferable to other cast irons for shock loading applications. The rapid release of air can cause wear problems on the valve internals. The use of stainless steel disc and stem minimizes these wear problems.

Actuators Manual systems should employ a two position lever handle. For valves larger than 4" we suggest the use of double acting pneumatic actuators. If pneumatic actuators are used the air for operation can be plant air if available or the air can be supplied as part of the air burst screen cleaning system from a controls air receiver fed from the primary receiver. A check valve is used to prevent backflow and the air is filtered to remove particulate.

Controls Control panel options are fairly self explanatory and are listed in the sample specification at the end of this chapter.

The table below provides a convenient format for assembling system information and choices.

For assistance in air burst system sizing and selection please contact your Lee Cook Intake Screens representative or Lee Cook at 513 247-9792

Simple The systems consist of four main components, a compressor, an air receiver, air release valves, and a main control panel with lockable disconnect. They are supplied as complete systems -- ready to be positioned, plumbed, and powered. The systems are factory assembled and tested prior to shipment. When practical all components are mounted on a common skid.

Reliable Air Burst Cleaning Systems are assembled using quality components, selected to match the service needs of the application. All moving parts are located in a common, readily accessible location. There are no moving components in or under the water to maintain.

System Protection They provide effective removal of debris from the surface of your Intake Screens. No debris is collected on shore. There are no debris handling or disposal problems to deal with. The system can even be operated while pumping when a wet well design is used for the pumps.

Screen Cleaning Lee Cook Intake Screen Co. Intake Screens are designed to minimize the accumulation of debris on the screen surface.

The Compressor: Compressor choices include auto stop start pressure switch, inlet air filter, and low oil level or low oil pressure shutdown switch:

______ 60% Duty Cycle splash lubricated or

______100% Duty Cycle pressure lubricated, with

______ Open Drip Proof Motor or ______ Totally Enclosed Fan Cooled Motor

______ Dual Compressors with alternator ______ Air Cooled Aftercooler

The Receiver: All Receivers are ASME Code Vessels. Working Pressure is 150 PSIG unless otherwise noted. All receivers shall be equipped with a pressure relief valve sized to handle the full discharge pressure of the compressor, a 4" dial pressure gage, and a float type automatic drain.

The Valves: Valves shall be lug type with ductile iron body, 316 stainless steel stem and disc, and Buna-N seat. Valves shall be rated for 200 psi end of line liquid service. Manual valves shall have 2 position handle. Valve size shall be equal to connecting line size. Actuated valves are recommended for sizes greater than 6".

The Actuators: Actuators are pneumatic, double acting type. Air is supplied through a supplemental reservoir isolated from the main receiver with a check valve. Air supplied to the supplemental receiver is filtered to remove particulate.

The Control Panel: Controls are enclosed in a NEMA IV enclosure. Motor Starter(s) are mounted in the control panel. All panels have a power on light, a test/off/auto switch for compressor control, and a lockable disconnect. Optional equipment includes:

______ push button valve initiation (includes control air receiver and pneumatic actuators with manual over-ride

______ limit switch package and illuminated pushbuttons to indicate valve at full travel

______ 4" diameter pressure gage in control panel

______ Timer based valve actuation with adjustable timer, timer/manual valve operation selection switch, limit switch package and illuminated pushbuttons indicating valve at full travel, automatic interlock to prevent automatic valve operation with inadequate air pressure (includes automatic sequencer for multiple valve systems)

______ remote cycle start input ______ differential pressure signal cycle start input

______ compressor run on indicator light _____ compressor fail to start indicator light

______ valve fail to open/close indicator lights _____ ready for backwash indicator light

______ automatic shut down and alarm with major fault

______ automatic alarm with minor fault

Submittals: The following submittals shall be provided:

Drawing showing interface dimensions, power requirements, and bolting requirements shall be provided for approval. Equipment literature on all major components. Installation, Operation and Maintenance instructions for the system.