SECTION 11XXX INTAKE SCREENS

Transcription

1 SECTION INTAKE SCREENS PART 1 - GENERAL 1.01 SCOPE A. Furnish all labor, materials, equipment, and incidentals required to install, test, and place in satisfactory working order two (2) intake tee screens including all associated hardware and air connections RELATED SECTIONS A. Section Submittals B. Section Operation and Maintenance Data C. Section Air Burst System D. Division 2 Piping & Fittings 1.03 SUBMITTALS A. Submit shop drawings, manufactures data and literature in accordance with Section prior to manufacturing screens. B. Submit drawings showing screen diameter length, outlet size and slot opening, materials of construction and assembly weight. C. Operation and Maintenance Data as described in Section QUALITY ASSURANCE A. Screens shall be fabricated by ASME Section IX Certified welders and the manufacture shall provide evidence of experience in having supplied at least five assemblies of similar designs which have been in successful service for at least three years QUALIFICATIONS A. All equipment furnished under this Specification shall be new and unused and shall be the standard product of manufacturers having a successful record of manufacturing and servicing the equipment and systems specified herein in a minimum of five (5) years

2 PART 2 - PRODUCTS 2.01 INTAKE SCREENS A. Plans and specifications have been prepared based on Cook Legacy, phone number (614) Only Manufacturers offering substitute equipment, which in the opinion of the Engineer, meets the mechanical, structural, process and performance requirements of the specifications shall be considered acceptable. The price for substitute equipment shall include the cost of all redesign, the cost of structural, mechanical and electrical changes when the considered item will not fit the design as determined by the Engineer. B. Approved Manufacture: The intake screens shall be manufactured by Cook Legacy (Canal Winchester, Ohio, phone: (614) , fax: (614) , web: or approved equal. Construction: Screen shall be cylindrical with circumferential slots that widen toward the inside of the cylinder. The drum portion of the tee screen shall be constructed of 304 stainless steel wedge wire with inch slot openings. The Open area for this slot opening shall be 64%. The screen surface shall be welded to an appropriate support member so as to provide necessary strength with minimal hydraulic resistance. The screen shall be constructed such that there is uniform flow distribution through the screen slots during water intake. The screen shall be equipped with a 3-inch pipe size internal air burst manifold assembly. The screens shall be equipped with flat plate or dished head ends. C. Coating: The coating shall be Jacquelyn as supplied and applied by Cook Legacy. It shall be a non-ablative coating employing no binders or carriers. It shall resist zebra mussel attachment in all water flow conditions including low velocity or quiet waters. It shall have a nominal life expectancy in fresh waters of at least 15 years. a. Nominal coating thickness shall be inches. b. All surfaces of the intake screen assembly shall be coated except flange faces. Interior surface of the air burst screen cleaning piping need not be coated. D. Capacity: Flow performance shall be based on physical and CFD modeling. The total combined intake screen capacity shall be 4500 GPM at a maximum local through slot velocity, due to water removal not to exceed 0.5 feet per second and the screen manufacturer must provide actual test data. At the design flow rate, the pressure drop through the surface of the clean screen shall not exceed 0.1 psi. The total pressure drop through the Tee assembly shall not exceed 1.0 foot of water. Hydraulic calculation and documentation verifying compliance to these criteria shall be provided upon request. E. Strength: Structural performance shall be based on ASME pressure calculations and FEA. Screen shall be capable of withstanding a differential hydrostatic pressure in excess of 7.4 pounds per square inch or a maximum working depth of 17 feet of water. The design stress when determining strength shall be two thirds of the yield stress. Strength calculation and documentation verifying compliance to these criteria shall be provided upon request. F. Materials and Fittings: The wire and supports shall be 304 stainless steel. The remainder of the assembly shall be manufactured of corrosion resistant metal, AISI type 304 or 316 stainless steel. The main outlet shall be a 30-inch plate flange with a bolt pattern equal to AWWA C-207, Table 1, Class B. The airburst cleaning connection shall be through a 3 inch ANSI Class 150 raised face slip on flange.

3 PART 3 - EXECUTION 3.01 INSTALLATION A. Install equipment in accordance with the approved shop drawings and the manufacturer s installation instructions. B. The Contractor shall furnish and install all stainless steel hardware and incidentals to mount the screens as shown on the drawings. END OF SECTION 11800

4 Section JACQUELYN SCREEN COATING 1.01 General A. The coating shall be a corrosion resistant and zebra mussel resistant metal coating. The coating shall employ no binder or carrier. The coating shall resist zebra mussel attachment in all water flow conditions including low velocity or quiet waters and have a nominal life expectancy of at least 15 years. The coating shall be Jacquelyn as applied and supplied by Cook Legacy or one of our authorized Licensees Coating Thickness and Coverage A. The nominal coating thickness shall be inches or as specified by the engineer. All surfaces of the screen assembly shall be coated except as noted herein. Flange faces shall not be coated. Interior surface of the air burst screen cleaning piping need not be coated Submittals A. Coating vendor shall supply verification that the coating has been tested by an independent U.S. EPA certified laboratory in accord with the National Sanitary Foundation protocol NSF 61 for leach testing and that concentration levels for copper using Certified U.S. EPA test procedures for measurement are below 0.05 mg/l. Coating vendor shall supply verification that the coating has been field tested in sites infested by zebra mussels and demonstrated resistance to the attachment of zebra mussels. Cook Legacy Coating Company

5 SECTION AIR BURST SCREEN CLEANING SYSTEM PART 1 GENERAL 1.01 SUMMARY A. Section Includes: 1. Air Compressors with Motors 2. Air Receivers 3. Related Components B. Related Sections: 1. Section 02510: Water System Piping and Accessories 2. Section 11800: Water Intake Screens 1.02 REFERENCES A. American Society of Mechanical Engineers (ASME) Section VIII Pressure Vessels Boiler and Pressure Vessel Code. B. National Board of Boiler and Pressure Vessel Inspectors (National Board). C. National Electrical Manufacturers Association (NEMA). D. Underwriters' Laboratories (UL) SUBMITTALS A. Submit all components as a single complete submittal in accordance with Section B. Shop Drawings: 1. Include sufficient data to show that equipment conforms to Specification requirements. 2. Motor data. 3. System layouts and/or schematics of compressors, receivers, piping, valves, and accessories. 4. 3D Model of AirBurst system showing general arrangement, access points, and clearances. 5. Elementary and connection wiring diagrams clearly showing external connections to other equipment. 6. Control Panel functional description and HMI Screen Shots. 7. Calculations verifying that the screen cleaning system complies with the specified performance criteria and is consistent with intake screen manufacturer's criteria related to screen size, water depth and air supply pipe length and diameter. Shall include performance curves showing delivered air at various water depth and tank pressures. 8. Name and address of service representative. 9. Control panel layout.

6 C. Equipment data for the compressor, motor, receivers, coolers, valves and safety valves to be provided shall include, but not limited to, manufacturer s name, equipment type and model, dimensions, weight, piston speed, performance data, bearing data, discharge air temperature, horsepower rating, temperature rating, power factor rating, efficiency rating, pressure rating, full load speed, full load amperage, locker rotor current, capacities, pressure drop, and piping connection sizes and locations. D. Manuals: With submittal furnish (3) hard copies and (1) digital copy of Draft O&M Manual including outline of the O&M Manual including system overview, testing, handling and installation procedure, pre-operation checks and inspection, startup procedure, operation and maintenance, troubleshooting, motor name plate data, safety precautions, lubrication, general maintenance schedule, general assembly drawings for complete system, shop drawings and catalogue cut sheets for all components, complete air compressor instructions, electrical schematics, bulletins, and recommended spare parts information. With project shipment furnish six (6) copies of complete O&M manual as outlined within Submittal Draft. E. Affidavits: Furnish statement from the manufacturers stating that the equipment has been properly installed and tested and is ready for full time operation after start-up QUALITY ASSURANCE A. All equipment furnished under this Section shall be of a manufacturer who has been regularly engaged in the design and manufacture of the equipment for at least five (5) years. Demonstrate to the satisfaction of the Engineer that the quality is equal to the equipment made by those manufacturers named herein. B. The contractor shall ensure compatibility of all equipment being supplied. All equipment from this section must be provided by a common manufacturer. PART 2 PRODUCTS 2.01 INTAKE SCREENS 2.02 SCREEN CLEANING SYSTEM A. Description: Provide an AirBurst screen cleaning system. The system shall consist of compressors, receiver, controls, piping, valves, air regulator(s) and pressure gauges to deliver air to an internal distribution system in the intake screen and release it rapidly. System shall include appurtenances necessary for successful operation and shall conform to the electrical plan Drawing xxx B. Maximum Submergence of Intake Screens: 20 feet. C. Cycle Time: System shall allow a complete cycle (cleaning of all four screens) in one hour. D. Compressor:

7 1. Two stage compressor, rated at 50.5 cfm of free air at 125 psig using a 15- horsepower, 240/480-volt, three phase, 60 Hz motor TEFC Motor and NEMA 4 Motor Starter. Compressor shall be Ingersoll Rand. 2. Noise Limits: Individual air compressors shall not produce noise exceeding 85 dba at 3 feet in a free field. If this cannot be accomplished by compressor design, provide a suitable ventilated acoustical enclosure to control the sound to this level. Unless they don t care then take this out. 3. Control Air Receiver shall have inlet air filter, check valve, pressure gauge, safety valve, filter/regulator with gauge and solenoid operated electric drain valve. 4. Electric drive motor shall conform to Section XXXXX GENERAL ELECTRICAL REQUIREMENTS. E. Receiver Tank: The receiver tank shall be 660 gallon (burst air) and 30 gallon (control air) and constructed of welded carbon steel for a working pressure of 200 psig in accordance with the ASME Pressure Vessel Code, Section VIII and shall bear the code stamp. Provide pressure gauge safety-relief valve and automatic drain with strainer. Pipe tank drain to floor drain. Receiver shall be mounted on support legs, frame or saddle for installation on the concrete pad. Acceptable Manufacturers: Penway Inc. or Equal F. All system air shall be filtered via Ingersoll Rand F178 I G. Control air shall be filtered via Ingersoll Rand F35IHE and F35IAC. Control air filters shall include isolated bypass for filter maintenance. G. Air Burst Valves (4 each): 6 inch lug-style butterfly valves, coated carbon steel body with stainless steel disc and stem. Valve shall have 200 PSI working pressure. Valves shall be isolated from control tank with ball valve. Valves shall be furnished with direct mount NEMA 4, 110 volt solenoid control valves with manual override and NEMA 4, 110 volt limit switches, Keystone Model 222/789 with Model 79U-006 Operator, or equal. H. Air Burst Components shall be provided on a common skid, neatly and logically organized, all wiring within steel conduit, and generally mounted to allow for rigorous industrial operation. Additionally, major Air Burst components will be labeled per the PID and logic diagrams provided in the Operation and Maintenance Manual. I. Control Panel: 1. Control panel shall include Micrologix 1100 PLC and other components for successful operation. This includes but is not limited to: 1) Lockable disconnect; 2) Transformer for control power; 3) Uninterruptible Power Supply for PLC; 4) Motor Protection Circuit Breaker for each compressor; 4) Relays for operational control; All components shall be mounted in a common NEMA 4 enclosure. All components shall be pre-wired with one terminal strip for interface connections to the rest of the system. Power to the panel shall be 480 VAC/3 Phase/60 Hertz.. 2. All system wiring shall be shop installed to terminal blocks in the control panel. Wiring from the panel to system components shall be completely enclosed in liquid-tight flexible conduit. 3. Internal panel wiring shall be neatly bundled and tied and shall be identified with suitable wire markers. Terminal blocks for external connections shall

8 be furnished complete with marking strips, covers and pressure connectors. A terminal shall be provided for each conductor or external circuit. All wiring shall be grouped or cabled and securely attached to the panel. Clearance for field wiring shall be provided between the terminal strips and base. 4. Screen Cleaning Cycle Controls: The airburst cycle shall be initiated manually or by a repeat cycle timer. a. Provide four-position (MANUAL-OFF-TIMER-REMOTE) hand switch. The manual position shall spring return to the OFF position. Switch functions shall be as follows: MANUAL - Allows operation to initiate an AIR BURST for as long as the operator holds the switch. OFF - No screen cleaning operation. TIMER - A repeat cycle time which is adjustable from the front of the panel allows for actuation of a screen cleaning cycle. One timer controller is used for both screen controls. REMOTE - Allows remote actuation from the RTU unit. J. Accessories 1. Supply each compressor assembly complete with the following accessories: a. V-belt drives with totally enclosed guards in accordance with the latest requirements of OSHA. b. Intake filter silencers. c. Pressure relief valves. d. Pressure gauges. e. Pressure switches for automatic start-stop operation. f. Pressure transducer for display and compressor operation. g. Low air pressure alarm switches SHOP PAINTING A. All components of the compressed air equipment package, including motors, shall be shop primed and finish coated prior to shipment to the WORK Site. B. All iron and steel surfaces, shall be thoroughly cleaned, sanded and shop primed with the specified rust-inhibitive primer, followed by finish coats of Safety Blue PPG Acrylic Urethane or Equal. PART 3 EXECUTION 3.01 INSTALLATION A. Equipment shall be installed in strict conformance with the manufacturer's installation instructions.

9 3.02 FIELD QUALITY CONTROL A. The intake screen/screen cleaning system manufacturer shall supply a competent field service engineer to thoroughly check and inspect the equipment after installation, place the equipment in operation, make necessary adjustments, calibrate instruments, and conduct field tests. The services required shall also include on-the-job training of operators including safety procedures, operating instructions, and preventive maintenance procedures. Furnish a minimum of two (2) man-days of field services. B. Field test the screen cleaning system to verify that it is operating properly. Furnish equipment and apparatus necessary for tests. Tests shall be witnessed by the Engineer. END OF SECTION