PART 1 - GENERAL
1.01 SUMMARY
A. This Section includes all labor, materials, equipment, and incidentals required for delivery to the project site ready for installation (1) rotating perforated plate screen and one (1) inclined shaftless screw conveyor for removing floating particles and fibrous material and for conveying, washing, dewatering and compacting the screenings before discharging the material into a dumpster; as shown on the drawings and described in the following specification. The treatment objective for the rotary drum screen is to capture solids from raw wastewater, wash them to remove organic solids, then compact and transport them to the dumpster.
B. The rotary drum screen and conveyor shall be located in the new Headworks Room.
C. The rotary drum screen unit and conveyor shall consist of an internally feed perforated plate screen basket, cleaning brushes, integral screenings and screenings wash-press, pivot stand,
bagger, inclined shaftless conveyor, and controls.
D. Related Work Specified Elsewhere:
1. General Requirements: DIVISION 1
2. Manufacturer's Field Services: DIVISION 1
3. Steel: DIVISION 5.
4. Painting: DIVISION 9.
5. Instrumentation & Electrical: DIVISION 16.
1.02 REFERENCES
A. Applicable Standards
1. American Bearing Manufacturers Association (ABMA).
2. American Gear Manufacturers Association (AGMA).
3. American Iron and Steel Institute (AISI).
4. American National Standards Institute (ANSI).
5. American Society for Testing and Materials (ASTM):
a. A36 - Structural Steel.
b. A48/A126 - Gray Iron Castings.
c. A322: Carbon and Alloy Steel Bar.
6. American Welding Society (AWS).
7. National Electrical Code (NEC).
8. National Electrical Manufacturers Association (NEMA).
9. National Fire Protection Association (NFPA).
10. Occupational Safety and Health Act (OSHA).
11. Underwriter’s Laboratories (UL).
1.03 QUALITY ASSURANCE
A. Like items of equipment provided hereunder shall be the end products of one Manufacturer in order to achieve standardization for appearance, operation, maintenance, spare parts, and manufacturer's service.
B. This Manufacturer shall have the responsibility of providing the equipment, accessories, installation supervision, and testing services required to provide a functioning system.
C. Products used in the Work of this Section shall be produced by the Manufacturer regularly engaged in the design and production of screening equipment for a minimum of ten (10) years
and with a history of successful installations in North America.
D. Manufacturer shall have a screen tested with panels of same size perforations and range of flows per plate surface area. Testing and report shall be conducted by an authority independent of the manufacturer. Test results shall include headloss and solids screen capture quantities and ratio with total solids contained in wastewater.
E. All equipment shall be designed, fabricated and assembled in accordance with the best engineering and shop practices. Individual parts shall be manufactured to standard sizes and gages, so that repair parts, furnished at any time, can be installed in the field. The equipment shall be new, not have been in service at any time prior to delivery, except as required by tests.
F. Manufacturer shall have a satisfactory field service record to be verifiable by Engineer in communication with no less than four (4) references for current users of similar equipment
furnished.
1.04 SUBMITTALS
A. Submit as specified in DIVISION 1.
B. Includes, but is not limited to the following:
1. Complete manufacturer’s data, specifications, and detailed drawings for all equipment and materials which shall include complete descriptive data to define materials sizes, capacities, types, models, accessories, etc. Drawings and other information shall be suitable for erection and installation of equipment and materials.
2. Test report from independent authority described in Quality Assurance.
3. Recommended spare parts list.
4. Electric power requirements, wiring diagrams, and schematics for all electrical equipment and devices.
5. Refer to Section 16901 – Control Panels for additional submittal requirements.
6. All structural loads imparted to the structure.
7. Submit screen headloss calculations at peak and design flows. The calculations shall include clean screen 0 percent and 70 percent of screen plate area blinded.
8. Manufacturer’s surface preparation, shop priming, and machined metal surface rust inhibitive compound requirements.
9. Recommended unloading method at project site including implement (e.g., forklift, etc.)
and maximum container or package weight.
10. List of installations, as described in Quality Assurance, including current Owner representative name, address, telephone number and fax number.
11. Installation, operation, and maintenance instruction manuals prior to delivery of equipment
and materials.
12. Submit structural calculations for the conveyor supports stamped by an Engineer certified to practice in the State of Colorado.
13. Parts lists.
14. Power and control schematic diagrams indicating factory and field wiring.
15. Conveyor name plate data.
a. Plant serial number
b. Fabricator
c. Capacity (under normal conditions)
d. Empty weight
16. Conveyor capacities under specified conditions.
17. Certification of 225 Brinell spiral by an independent testing laboratory.
18. Operation & Maintenance manual.
19. Manufacturer’s product warranty.
20. Motor data consisting of the following.
a. Manufacturer's name and serial number.
b. Horsepower output.
c. Temperature rise and method indicated.
d. Maximum ambient temperature.
e. Insulation class.
f. Rpm at rated load.
g. Frequency.
h. Number of phases.
i. Voltage.
j. Rated load amperes.
k. Locked rotor amperes or code letter.
l. Service factor.
m. Maximum noise level of pump/motor unit (dBA).
n. Efficiency, determined in accordance with IEEE Standard 112, Method B.
o. Dimensions for enclosure and shafts.
p. Weight.
q. Bearing information.
r. Structural design calculations certified by Colorado registered professional engineer.
1.05 WARRANTY
A. The manufacturer shall warrant that all Equipment shall be free of defects caused by faulty material or workmanship and shall replace those parts for at least a period of two (2) years from the date of start-up.
B. Multiple warranties for individual components shall not be acceptable.
1.06 DELIVERY, STORAGE, AND HANDLING
A. Deliver, store and handle all equipment and materials in a manner to ensure installation in sound and undamaged condition, to prevent damage from exposure to the elements, and in accordance with the requirements in DIVISION 1.
B. Adequately seal and protect equipment for outdoor storage at project site. Protect all bearings with grease packing or lubrication oil.
PART 2 - PRODUCTS
2.01 ACCEPTABLE MANUFACTURERS
A. Huber Technology, Inc.
B. Lakeside Equipment
C. Johnson Screens
D. Engineer approved equal.
2.02 SERVICE CONDITIONS:
A. The screening system shall be used to screen raw domestic wastewater gravity fed to the
Headworks Building from the collection system.
B. Screenings captured and collected from the screen are to be washed, dewatered and compacted.
Processed screenings shall be conveyed and deposited into a disposal container/roll-off dumpster supplied by others.
2.03 GENERAL REQUIREMENTS
A. Provide ready for installation for the following:
1. One (1) perforated plate rotary drum screen with integral washer/dewater/compactor unit.
2. One (1) screenings transfer chute as indicated on drawings.
3. One (1) inclined shaftless screw conveyor as indicated on drawings.
B. Include with each screening unit:
1. Screen, wash press, transfer chute, inclined shaftless screw conveyor, motors, gear reducers, controls, control panels, and lifting attachments
2. All items necessary for complete assembly.
3. All appurtenances and safety devices required for proper operation.
4. All manuals, drawings, parts list, and special tools required for assembly, maintenance, and operation.
5. Lubricants (if required) for start-up procedure specified.
6. Standard set of spare parts.
C. The screening equipment shall be delivered completely assembled or in convenient sections as permitted by common carrier and required for installation.
D. All Equipment shall be designed and built for 24-hour intermittent or continuous service and for moderate shock without overheating, excessive vibration or strain.
E. All bolts, nuts and washers shall be 304 stainless steel.
2.04 OPERATING CONDITIONS
A. General
1. Wastewater enters the inside of the drum screen and solids within the incoming flow shall progressively collect onto the fixed screening element. The collected solids captured on the screen gradually blind the submerged media which causes the upstream water level to rise. At a predetermined differential water level (between the upstream
and downstream of the screen) programmed into the PLC; the drum and conveyance spiral drive will operate. Design motors shall be activated to: (1) rotate a section of clean drum screen into the wastewater, (2) clean the drum screen and (3) transport, wash, compact, and convey the screenings to the transfer chute (4) convey dewatered screenings to a dumpster located in the upper headworks room.
B. Design Requirements:
1. Design Flows:
a. Peak plant flow: 6.3 MGD
b. Design plant flow: 3.0 MGD
2. Influent TSS: 164 mg/L
3. Rotary Drum Screen with Integral Screenings Washer/Dewater/Compactor:
a. Number of units: One (1)
b. Maximum effective size of screen panel perforations: 1/4 inch (6 mm)
c. Maximum Drum Motor Hp: 2 Hp
4. Transfer Chute from Screen Discharge to Conveyor:
a. Number of units: One (1)
b. Minimum Angle of Inclination: 60 Degrees
5. Inclined Shaftless Screw Conveyor:
a. Number of units: One (1)
b. Maximum Conveyor Design Loading Rate: 600 lb dry solids/hr. c. Conveyor Trough Load: 25%.
d. Cake Density: 50-70 lbs/ft3.
e. Maximum Spiral Speed: 25 RPM.
f. The conveyors shall be designed to start and operate with the trough 100% full of dewatered screenings without damage or overloading of any component.
g. Minimum Screw Diameter: 10.0 inches
h. Angle of Inclination: 43 Degrees
i. Maximum Motor Hp: 5 Hp
j. Components shall be designed to handle abrasive solids with minimum wear.
k. Conveyor shall be designed to start when the conveyor trough is fully loaded.
l. Conveyor and supports shall be designed and stamped by Colorado Registered
Professional Engineer by the Manufacturer for the unsupported lengths indicated on the Drawings.
6. Location Rating:
a. Class 1, Division 1
C. Dimensions and Elevations:
1. The following shall be as recommended by the manufacturer to meet operating performance requirements. Dimensions are expected to be within the following values:
a. Screen installation angle: 35 degrees
b. Influent channel bottom elevation: 4860.00
c. Influent channel top elevation: 4865.00
d. Influent channel width: 3’0”
e. Influent channel recess width: 4’9”
f. Water level downstream at peak flow: 1’6”.
g. Max water level upstream: 2’6”
h. Upper headworks operating floor elevation: 4878.00
2. The drawings show dimensions, shape and elevations proposed by one manufacturer. The
Contractor is responsible for executing any revisions to meet the recommendation of the manufacturer providing the equipment at no additional cost to the Owner.
2.05 MECHANICAL SCREEN
A. Unless otherwise specified all equipment to be manufactured from 304 stainless steel. The equipment, after its fabrication, shall undergo a passivation (pickling) process to ensure maximum resistance to corrosion.
B. Screen
1. The cylindrical fine screen shall be designed and built to withstand all static and hydraulic forces exerted by the liquid to the screen. All structural and functional parts shall be sized for the loads encountered during screening, conveying and pressing operations.
2. The screen basket shall be of cylindrical shape.
3. The perforated plates shall be around the entire basket circumference.
4. Bar type screens will not be acceptable.
5. The screen shall be designed to handle the maximum flow with the maximum upstream and downstream water levels indicated in Section 2.04C.
6. Seal plate shall be provided between the circular screen and the channel and shall conform
to the following:
a. One-piece fabricated stainless steel
b. Sufficient height to prevent bypassing of flow around screen at the maximum screen hydraulic capacity.
c. Brush shall to be clamped to the seal plate to seal the gap between the fixed seal plate
and the rotating screen basket.
7. Stainless steel support stand shall be provided to allow easy removal of the screen basket from the channel for maintenance.
8. The screen shall be provided with a stainless steel housing of four wall plates and a cover.
The cover shall be removable and shall be secured with turn-locks.
C. Cleaning Brushes
1. The screen basket shall rotate in one direction and pass through the topmost position where
it is cleaned with spray nozzles and a brush penetrating the depth of the screen to ensure positive screenings removal.
2. The brush shall be designed to ensure cleaning of the spaces to the full depth of the perforated plate. The cleaning brush shall be mounted upon a stainless steel holding device which keeps the brush in constant contact with the basket.
3. The mounting device shall allow for adjustment for brush wear.
D. Screenings Conveyor and Screenings Wash-Press
1. An auger screw that is entirely made of stainless steel shall be provided to transport and dewater the screened material.
2. The screenings conveyance and screenings wash-press shall be sized according to the flows
listed in paragraph 2.04 B.
3. A compaction zone shall be an integral part of the screenings screw conveyer and transport tube design. The compaction zone shall be designed to form a screenings plug of material
and to return water released from the screened material back to the wastewater channel.
4. The screenings shall be discharge to an enclosed transfer chute that transfers the compacted screenings to the inclined screenings conveyor. This chute will be totally enclosed from the
screenings discharge to the inclined conveyor.
E. Drive
1. Drive unit shall be the manufacturer’s standard design.
2. All motors shall be UL listed for Class 1 Division 1 Groups D locations.
3. All motors shall meet the requirements of Section 16150.
F. Spray Wash System
1. An automatic spray wash system shall be provided for cleaning of the screen basket and shall be operated only while the screen basket is rotating.
2. Shall be of manufacturer’s standard design.
3. The manufacturer shall provide any solenoid or other valves required for the automatic operation of the spray wash system.
4. Any solenoid valves shall be operated by the programmable logic controller. Individual manual operation of each solenoid shall also be possible from the control panel.
5. If the design of the spray wash system requires the use of a Y-strainer for the incoming plant water supply, one will be provided by the manufacturer.
G. Anchor Bolts
1. Equipment manufacturer shall furnish all anchor bolts of ample size and strength required to securely anchor each item of equipment. Anchor bolts, hex nuts, and washers shall be
304 stainless steel.
2. Anchor bolts shall be set by the contractor. Equipment shall be placed on the foundations, leveled, shimmed, bolted down, and grouted with a non-shrinking grout.
3. Anchor bolts shall conform to Section 03151 – Concrete Anchors.
2.06 SCREENINGS CONVEYOR
A. Construct conveyors from type 304 stainless steel. Minimum material thicknesses and dimensions are as follows. Manufacturer shall provide thicknesses required for specific installation:
1. Trough Body and Chutes: 3/16" plate
2. Trough Top Flanges: 3/16" angle or formed as part of trough body
3. Trough Covers: 1/8" plate
4. End Plates: 3/8" plate
5. Coupling Guards: 1/16"
6. Internal Stiffeners: 3/16"
7. Supports:
a. Welded to Trough Body: 3/8" b. Saddle-Type: 3/16"
8. Bolts/Nuts/Washers: ANSI M12 or larger, type 304 stainless, Grade 8.8, hex-head, flat-face
washers.
9. Gaskets; 1/8-inch neoprene, 50 durometer.
10. Wear Liner: 1/2-inch polyethylene (UHMW).
11. Spiral Flighting High Strength Alloy Carbon Steel:
a. Minimum 225 Brinnell.
b. 1.0 inches minimum thickness x 3-inches wide.
B. Trough, Covers, and End Plates:
1. Conveyor trough bodies to be rolled to shape, with flanges welded to the trough. Conveyor
troughs shall be provided with inlet and discharge chutes as required and as indicated on the Drawings. Glue 1/8-inch thick neoprene gasket over full face of one flange for adjoining flanges.
2. Fabricate end plates from single steel plates and weld or bolt across ends of the trough.
Fabricate drive motor/gear reducer/bearing/stuffing box assembly, end shaft/end bearing/stuffing box assembly of all welded construction using steel plate, shaped to
support end bearings and drives in true alignment. These assemblies to be bolted to the
trough end plate using a matching mounting plate.
3. Conveyor troughs to be complete with saddle-type supports shaped to the profile of the screw conveyor trough and extending to a common fixed distance below the centerline of the screw. Include separate support points under the drive end assembly and end shaft assembly welded as an integral part of these assemblies.
4. The inclined screw conveyor shall be provided with a 2-inch diameter drain flange as indicated on the Drawings for drainage of excess liquid in conveyor during cleaning
activities.
5. Stiffeners shall be placed across the top of the trough and fastened to both sides of the trough to maintain the shape and act as a face seal for the covers.
6. Trough Covers: The entire trough shall be covered by a stainless steel plate, hinged on one side and clamped on the other. The covers shall be approximately 4-feet in length to allow easy access to the conveyors. The length of the covers will be such that each edge joint
rests upon a trough stiffener. A neoprene gasket shall be installed along the trough sides and stiffeners to ensure a drip-proof connection. All gasket material shall be shielded by
the covers.
7. The inlet to each trough shall be equipped with reinforced flange.
8. The troughs of the screw conveyors shall be provided with a 2-inch NPT connection for flushing and to lubricate the liners to prevent excessive wear.
C. Spiral Flighting (Shaftless):
1. Screw conveyor spirals shall be cold-rolled spirals made of superior, high-strength spring carbon steel bars of not less than:
a. 225 Brinnell hardness.
b. 80,000 psi yield strength, minimum.
c. 1-inch thickness for spiral diameters 10-inches and greater.
2. Spiral flights shall be designed to prevent distortion and jumping in the trough. The torsional rating of the auger flighting shall not exceed 35 percent of the yield value in the extreme fiber of the flight material.
3. Spirals shall be formed in a spiral-forming machine to the diameter and pitch required.
Each formed sub-section of a spiral shall be factory-welded into full lengths. Sectional spirals made from abrasion resistant (AR) plate or AR bar are not acceptable.
4. Maximum spiral neck down from outer edge to inner edge shall be 20 percent. Spiral shall have no grind marks on outer edge.
5. Manufacturer shall demonstrate that, at 250 percent of the motor nameplate horsepower,
the drive unit cannot produce more torque than the torsional rating of the flighting, and that the spring effect of the spiral shall not exceed +0.04 inch per foot of length at maximum load conditions.
6. The spiral’s outside face shall be flat and smooth, with the face parallel to the axis of the screw conveyor, and the edges of the outside face rounded so as not to have a sharp edge.
7. The connection of the spiral to the drive system shall be through a flanged connection plate that is welded to the spiral forming a smooth and continuous transformation from the flange
plate to the spiral. The drive shaft shall have a mating matching flange and shall be bolted to the spiral connection plate. The drive shaft shall be shaft-mounted into the gear reducer output shaft.
8. The tail (end opposite the drive end) shall not be restrained in any manner (i.e., no tail bearings, thrust plate, etc.).
9. A gland packing ring consisting of a minimum of two Teflon-coated packing rings, nominal 1/2-inch square packing, with packing adjustment, shall seal the drive shaft at its penetration through the trough end plate.
10. Wear Liner: Conveyor trough shall be equipped with a wear liner along the entire length.
The wear liner shall be fabricated of ultra-high molecular weight virgin, non-recycled polyethylene. To provide ease of replacement, the wear liner shall be provided in 4-foot
sections. The liner shall be held in place with clips out of the path of expected wear.
Bolted liners are not acceptable.
11. Stuffing boxes to be complete with Teflon-impregnated packing, packing ring adjustment to tighten packing onto shaft, and packing, ring housing bolted to screw conveyor trough end plate.
12. Thrust-carrying bearings to be fixed location, with spherical roller bearing mounted on
drive shaft, complete with bearing recess shoulder. Non-thrust bearings to be non-locating, free-floating assembly and may be mounted with a tapered bore, plus adapter ring, on a
plain diameter shaft, where no power is transmitted from the shaft to another shaft.
Mounting of pillow block bearings shall be to the drive or end shaft assembly, and all components upon which the bearings are mounted, and must conform to the requirements of the bearing manufacturer for the loading and design conditions of the service.
13. Gear reducers to be parallel helical or bevel helical, 2-, 3-, or 4-stage gear reducers, for shaft mounting. Size gear reducers based on the input power to each gear reducer, with the
resulting torque calculated at the output shaft rpm, with a safety factor of 1.5 times this calculated torque. The nominal rated output torque (AGMA) to greater than or equal to the
calculated output torque and its safety factors. A second criteria to be met is that the nominal rated output torque must exceed the electric motor nameplate horsepower equivalent torque at the gear reducer output shaft rpm.
14. Bearings shall be designed for the thrust loads from the fully loaded start-up condition and shall have a L10 life of 30,000 hours. The reducer shall be the standard air-cooled unit with
no auxiliary cooling.
15. V-belt driven speed reducer or chain driven reducer not permitted.
D. Conveyor Supports:
1. Each conveyor shall be furnished complete with supports suitable for mounting as required by the Manufacturer’s design. The supports shall be shop fabricated from structural steel
shapes and plates. The supports shall be designed to facilitate the unsupported lengths indicated on the Drawings. See Drawings for support detail.
2. All structural members shall be designed such that the ratio of the unbraced length to least radius of gyration (slenderness ratio) shall not exceed 120 for any compression member and shall not exceed 240 for any tension member. In addition, all structural members and
connections shall be designed so that the unit stresses will not exceed the American
Institute of Steel construction allowable stresses by more than 1/3 when subject to loading of twice the maximum design operating torque of the screw conveyor drive motors.
3. All shop welding shall conform to the latest standards of the American Welding Society.
E. Inspection Door:
1. Provide one (1) inspection door on the conveyor.
2. Conveyor inspection door shall be 3/16 inch minimum stainless steel. Provide piano-type hinges and handles.
3. Inspection door shall be furnished with 304 stainless steel grid with 2 inch by 2 inch mesh
to prevent entry of foreign objects.
4. Inspection door shall be equipped with a NEMA 4 limit switch that will shut down the conveyor when the door opens.
F. Transfer Chute:
1. Provide a transfer chute for the connection between screen and inclined screw conveyor.
Chute shall be fabricated of 3/16” thick 304 stainless steel.
2. Size, shape, and location shall be determined by manufacturer to ensure proper operation and collection of dewatered screenings as it leaves the screen.
G. Discharge Chute:
1. Provide discharge chute for load out of dewatered screenings into a roll-off dumpster.
Discharge chute shall be fabricated of ¼” thick 304 stainless steel.
H. Safety:
1. The conveyor shall be equipped with all guards, shields, and covers required by OSHA
standards and normal safety practices.
2.07 CONTROLS
A. All controls necessary for the fully automated operation of the screening and conveyance system shall be provided.
B. The electrical control system shall provide an automatic control of the screening system via a
differential upstream and downstream water level using ultrasonic level sensors in combination with an adjustable timer. The ultrasonic water level sensors shall conform to Section 16902. The inclined conveyor shall be automatically controlled on an adjustable timer.
C. The electrical control system shall provide a timer to control the inclined conveyor. D. Screen Control Panel:
1. The screen control panel shall be UL 508A listed and comply with NEC Article 409 for industrial control panels.
2. The remote control panel located in the electrical room shall be rated NEMA 12.
3. The control panel shall be supplied with a single 480-volt, 3-phase power source.
4. The control panel shall include a 480V-120AC control power transformer with primary and secondary fused protection.
5. The control panel shall contain all required components for complete control and monitoring of the screen, compactor, washwater solenoid valve, conveyor, level controls and associated equipment. As a minimum, the following components shall be installed in the panel:
a. Door interlocked main disconnect.
b. Motor starters for screen drive, grinder/compactor, cleaning brush, and conveyor.
c. Conveyor starter to be combination full voltage reversing (FVR)
d. Control power transformer.
e. Allen Bradley ControlLogix PLC.
f. Operator interface touch screen.
g. Uninterruptible Power Supply (UPS).
h. Required circuit breakers, control relays, power supplies, selector switches and indicating lights.
i. Provide and install a conveyor motion sensor (zero speed detection) at a location to
give positive indication of rotation of the spiral, 115 VAC, two output 5A contacts, inductive or proximity type, solid-state design with adjustable start-up delay timer.
6. Jam Protection for the Screen/Conveyor:
a. Jam protection shall be provided for the screen/conveyor by a current transducer connected to the PLC.
b. Provide current transducer with properly sized current transformers. Current transducer and current transformers shall be installed in the control panel.
c. Device sensing range shall be selected based upon the equipment being protected.
7. All devices shall be factory installed, wired and tested. Terminal blocks shall be provided and labeled as required for power, control and instrumentation.
8. The following inputs shall be provided to the control panel for connection from the plant control system:
a. Screen remote start/stop.
b. Conveyor remote start/stop.
9. The following dry contact outputs shall be provided from the control panel for connection to the plant control system:
a. Screen in Remote.
b. Screen Run Status.
c. Screen Failure (Common alarm for all equipment associated with the rotary drum screen).
d. Conveyor in Remote
e. Conveyor in Run Status
f. Conveyor Failure
10. The following analog outputs (4-20mA) shall be provided from the panel for connection to
the plant control system:
a. Screen Influent Level.
b. Screen Effluent Level.
11. As a minimum the following selector switches, pushbuttons and indicating lights shall be mounted on the door of the control panel:
a. Local/Remote switch.
b. Hand/Off/Auto switch.
c. Reverse Jog pushbutton.
d. Power On indicating light.
e. Run Status indicating light.
f. Equipment Failure indicating light.
12. Additional status points and adjustment of set points and operating parameters shall be available via the operator touchscreen. As a minimum the following parameters and status points shall be viewable and/or adjustable via the operator touchscreen:
a. Screen Head Differential.
b. Screen Head Differential Set Point.
c. Backup Timer Setting.
d. Jam protection current set point.
e. Run Time.
f. Run Status indication for all equipment.
g. Identify cause of equipment Failure.
E. Screen/Conveyor Local Control Station and Junction Box:
1. The panel shall be a NEMA type 7 enclosure and be installed near the equipment and be suitable for installation in a Class 1, Division 1, Group D area.
2. The panel shall act as the single point of electrical connection to the screen/conveyor. All
electrical equipment shall be wired at the factory to the panel. All conduits and fittings installed between the panel and the electrical equipment shall be aluminum or stainless steel and suitable for installation in Class 1, Division 1, Group D area. Conduit and cable installation shall conform in all respects to the National Electric Code. Conduit seals shall be installed as required.
3. Conduit openings in the panel shall be provided as indicated and required to facilitate installation of the conduit and cabling to the main control panel and skid mounted equipment.
4. The panel shall contain all required components to implement the control functionality specified and to allow for the electrical connection of the skid mounted equipment to the
main control panel. As a minimum, the following components shall be installed in the panel:
a. Required pushbuttons, selector switches and indicating lights.
b. Terminal blocks.
5. As a minimum the following selector switches and pushbuttons shall be mounted on the
door of the panel:
a. Screen and conveyor Forward/Reverse Jog selector switch.
b. Emergency Stop pushbutton.
c. Hand/Off/Auto switch
2.08 SEQUENCE OF OPERATION
A. Hand Operation
1. The spiral motor and spray wash shall run continuously.
B. Automatic Operation
1. The level sensors shall start the unit. After the differential level has been lowered, the unit shall continue to run for the length of time set on the off delay timer, typically set at 30
seconds. The press zone spray wash shall typically operate whenever the spiral runs. A
repeat cycle timer (on time first) shall be included to regulate the spray wash run time, as required.
C. Emergency Stop
1. The unit can be deactivated at any time by pressing either the control panel mounted or unit mounted Emergency Stop push button.
D. Fault Conditions
1. Motor overload or high current shall stop the drive motor and illuminate the fault light.
2.09 SOURCE QUALITY CONTROL
A. Each screen system and controller shall be factory tested to ensure satisfactory operation.
2.10 ACCESSORIES
A. Provide all templates and special wrenches or tools necessary for proper installation and maintenance of Equipment.
PART 3 - EXECUTION
3.01 PREPARATION
A. Prepare surfaces in shop and finish all surfaces as specified in DIVISION 9.
B. Store all Equipment as specified in DIVISION 1 and as required to prevent damage.
C. Assemble and test drive units in factory.
3.02 INSTALLATION
A. In accordance with manufacturer's instructions and as indicated.
B. Install all electrical conduits, wires, tubing, instrumentation and other appurtenances as required for satisfactory operation.
C. Prepare surface and paint or touch up all surfaces as specified in DIVISION 9.
3.03 FIELD QUALITY CONTROL AND ADJUSTMENTS
A. Manufacturer's Field Services: Provide all services as specified in DIVISION 1 and as follows:
B. The equipment suppliers shall furnish the services of a factory-trained representative on site for a
period of no less than 2 days (16 hours). The representative shall inspect, adjust, calibrate and
place into operation the system, then train Owner operating personnel. If additional services are required to produce a fully operational system, they shall be provided at no cost to the Owner.
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