| PART 1 | GENERAL |
| 1.1 | DESCRIPTION |
| 1.1.1 | Work Included: This section describes the requirements for labor, materials, equipment, and services necessary to furnish, fabricate, and install a modular dual cyclone bus vacuum system. Site preparation including footings, compressed air, power, and water are not a part of this work. |
| 1.1.2 | Electrical Work: Electrical work shall be in accordance with the applicable provisions of the National Electric Code. |
| 1.2 | QUALITY ASSURANCE |
| 1.2.1 | Field Verification: Contractor shall verify field clearances, dimensions, and actual conditions of the area. Any discrepancy that may affect proper installation work shall be promptly reported to the project engineers. It shall be the responsibility of the contractor to undertake corrective measures, as directed by the project engineers, before starting the work as specified. |
| 1.2.2 | Coordination: Coordinate the installation of the bus vacuum systems with site preparation of the fuel island. |
| 1.2.3 | Codes and Regulations: The bus vacuum system shall be in accordance with national and commercial standards, codes, rules and regulations, local ordinances, and other authorities having jurisdiction on this work. |
| 1.2.4 | Manufacturer's Qualifications: The manufacturer shall have been regularly engaged in design and manufacture of specified modular equipment in satisfactory commercial use/operation for a period of at least five years. |
| 1.3 | SUBMITTALS |
| 1.3.1 | Shop Drawings: Submit shop drawings with complete installation and erection details along with assembly and detail drawings for review by engineer. |
| 1.3.2 | Technical Literature: Technical literature on the assembly and components shall be submitted for review by Engineer. |
| 1.3.3 | Instruction and Maintenance Manuals: All instruction and maintenance manuals shall be submitted for review by Engineer. |
| PART 2 | PRODUCTS |
| 2.1 | GENERAL |
| 2.1.1 | Description of Systems: The bus interior vacuum cleaner system shall be the same as manufactured by Robertson Air Systems or equal. It shall be designed and constructed for sustained heavy-duty utilization of daily bus fleet cleaning. During the vacuuming procedure, the industrial blowers shall cause air movement within the bus of sufficient velocity to capture and transport dust and debris into the cleaner. Dust and debris shall be transported through the buses' front door into the bellows, then upward through a connecting flex duct and into the double cyclone centrifugal dust separator unit. Dust and debris shall pass through the bottom discharge cones into the sealed trash container with clean air exhausting out the top of the cyclone separators. |
| 2.1.2 | Sequence of Operation: A bus is then driven into place for vacuuming and fueling and parked with it's wheels approximately 6" from the curb and it's rear door or window are opened. The bellows mounted "START" push button is then pressed and shall move the bellows forward, turn on the atomizing misters, and open the stack dampers. The bellows shall seal against the periphery of the door opening. Cleaning personnel shall take the air gun and move to the rear of the bus and with the hand-held air gun, sweep from under seats stirring up dust and debris. Deodorant shall be dispersed through the bus while the air gun is being used. Pushing of the "STOP" button on the bellows shall automatically move the bellows away from the bus to a retracted position, rewind the hose reel, time stop the blowers, turn off the atomizing misters and close the two stack dampers. The blowers shall run for approximately 5 minutes and then stop |
| 2.1.2 | Alternatives: All system equipment and accessory specifications contained herein are to be considered as minimum and typical only of the type required to provide a workable system. Any manufacturer or distributor providing equipment which meets or exceeds specifications and performance shall be equally considered in bid evaluation, provided it shall be contained within the specified space. |
| 2.1.3 | Interior Vacuum Cleaning: The interior vacuum cleaning of buses shall be a function accomplished during daily fleet fueling and servicing. Buses shall be driven through the service lanes, with simultaneous fare-box retrieval and data download, fueling, servicing, and interior cleaning occurring at each servicing station. Bus time on-station during all service and cleaning functions averages four to seven minutes. Installed vacuum cleaner assemblies shall be capable of effective bus interior vacuum cleaning within two to three minutes. |
| a) | Noise Level: Vacuum cleaner operation shall not exceed 87 DBA 5 feet above floor level and 5 feet in front of cyclones with the stack dampers open. The noise level shall not exceed 83 DBA with the dampers shut. |
| b) | Utilities: Electrical power: |
62 AMPS per system 460 VAC, 60 Hz, 3-phase 115 VAC, 60 Hz, single-phase |
| Central compressed air: | 100 psig and 34 cfm per system |
| 2.1.4 | Bellows: The vac system shall be installed as directed either preceding and/or following the service island and shall be connected to the cyclone/blower assembly with flex duct. |
| 2.1.5 | Floor Space: Total floor space occupied by the complete assembly shall be no greater than 14 feet 6 inches long by 5 feet 9 inches wide. The height shall be a maximum of 19 feet above the service island. Equipment shall not impede passage of buses. |
| 2.1.6 | Dust Control Atomizing Spray Nozzles (optional) located on the inlet to the cyclone. The nozzles will emit microscopic water particles that will attach to the dust particles 10-50 microns in size and cause them to drop out during separation and collection. |
| 2.2 | EQUIPMENT AND DESIGN FEATURES1 |
| 2.2.1 | Equipment Description for Each Vacuum System: Items necessary for a complete and working installation with major assemblies or components are as follows: |
| a) | Air blow guns (one at each station, with 16 inch sweeper barrel). |
| b) | Bellows assembly--28 inch minimum travel. In retracted position, the bellow shall leave 11 inches horizontal. clearance to the top of the curb, so that passage between the bellows and bus doors is possible. |
| c) | Supporting steel frame with four legs of 4 inch by 3/8 inch angle. |
| d) | Separator assembly to include two 48 inch centrifugal dust cyclone separators; electric motor; industrial exhaust fan; discharge cone; and spring-loaded, hinged, gasketed lid for container. |
| e) | The blowers include two in-line BCS blowers that pull clean air off the top of each cyclone. |
| f) | Atomized misters dampen the air entering the cyclones with microscopic water particles. The water particles attach to the dust particles (10 to 50 microns in size) and cause them to drop out during separation. Each atomizing nozzles shall emit approximately 1/2 gallon of water every 2 hours. |
| g) | Electric components to include electric motor starting equipment; overload protection in all three phases controls and panels; solenoid valves; selector switches; signal lights; timers; and terminal strips; and circuit breakers and overload reset buttons; and shall be in accordance with electrical specifications. |
| h) | Deodorizer system consisting of one stainless steel vessel, in-line with the air connection to the hose reel. |
| i) | Hose reel, located at the bellows and/or at the rear door. |
| j) | Container--3 cubic yards minimum, two required per position. The container shall be on rubber wheels and compatible with the local scavenger company's trucks. |
| k) | Pneumatic components to include air controls and panels, isolating valves, air cylinders, speed controls, air solenoid valves, air filters, air pressure regulator, and pressure gauges. |
| l) | Miscellaneous hardware, anchor bolts, and fasteners. |
| 2.2.2 | Retractable bellows: The bellows shall extend toward the bus sealing against the side of the bus outside the doors with neoprene rubber on all contacting surfaces. The vertical seals shall be flexible to permit them to conform to straight or curved surfaces. Allowable leakage shall be a maximum of 8 percent. In the retracted position, neither bearings nor rails shall obstruct the area on top of the curb in front of the bus door. The forward and backward movement shall be imparted by a pneumatic piston located beneath the cover plate. The bellows shall consist of the following components starting at the bottom. |
| a) | A 1/4 inch cover plate with wheels and piston. |
| b) | A vertical bulkhead supporting the air exhaust opening, pushbuttons, two louvers and top seal. |
| c) | Two double skinned louvers with spring-loaded neoprene rubber seals along the vertical leading edges shall form the seal along the outside of the bus outside the doors. The forward flap and rear flap shall have a two-position pneumatic control for either "narrow" or "wide" doors. |
| d) | A spring loaded top seal covering the top of the vertical frame with neoprene rubber along the leading edge shall seal across the top of the doors. |
| 2.2.3 | Blowers: The blowers shall "pull" clean air off each cyclone top discharge opening and be an industrial in-line BCS type, standard construction, rated for 12,000 cfm at 7-1/2 in WG S.P. using a 25-hp, 3-60-220/460, TEFC motor and including fixed pitch V-belt drive; access door; and belt guard. Each vacuum system shall be equipped with two blowers. |
| 2.2.4 | Separator Assembly: The separator assembly shall consist of two 48 inch diameter cyclones with 16 inch diameter bottom discharge openings and 23 inch diameter stacks, 16 inch diameter by 10 inch long flexhaust connector; and a hinged spring loaded lid. The cyclone shell shall be minimum 12 gauge. The inlet shall have a gradual transition from the blower discharge to an area that shall limit the inlet velocity to 3500 feet minimum. Each cyclone shall have a cylindrical self-cleaning wire mesh screen on the inside below the stack to prevent carry-over of light floatables, such as small pieces of paper. The support structure shall be capable of supporting the blower, motor, stack dampers, lid, and cyclones. It shall have sufficient cross bracing to prevent vibration of the entire structure. |
| 2.2.5 | Trash Container: The trash container shall be 72 inches long by 50 inches wide by 51-3/4 inches high with a 2 inch wide lip on top. The sides shall be minimum 14 gauge and adequately supported to prevent distortion with a 8 inch H20 positive pressure. The ends shall have guides for lifting with a front fork-lift type disposal truck. The trash container shall be mounted on four vulcanized rubber-tired casters, each rated for 1000 lbs. minimum. The four casters shall be the swivel type. It shall have its own hinged sheet metal cover to protect the collected material from being blown out while being stored prior to collection by the disposal truck. The trash container shall have two rigid steel hand grips to facilitate movement. The trash container box shall be of sufficient capacity to hold the dust and debris for 250 buses before requiring emptying or replacing. The trash container shall be removable by releasing the hold-down clamps on the spring loaded lid and wheeling it by hand to a temporary storage area where it shall later be unloaded by a disposal truck. Two cyclone assembly mounted guides shall help the trash container line up with the lid after dumping. |
| 2.2.6 | Hose Reel: The hose reel shall be an American Reeling Device Model 1105-18-02 or equivalent. Air rewind, open heavy-duty type, with a capacity of 60 feet of 3/8 inch hose, sealed for life bearing, and rolled edge sheaves. Includes 60 feet of 3/8 inch I.D. 800 psig minimum burst pressure air hose with 1/4 inch male pipe thread air line coupler. Reels shall be integral with the packaged vacuum system located behind the bellows with the hose passing through the bellows. A timer, not a contact switch, shall be used to stop the rewind cycle. A 12 inch nipple at the swivel shall prevent the hose from wrapping around the swivel connection. |
| 2.2.7 | Air Gun: The Robertson Air Systems air gun shall be 16 inches long with a amflo booster nozzle attached the front tip. It shall be rated for 34 cfm full flow at 100 psig line pressure. |
| 2.2.8 | Odor Neutralizing System: The ASME stainless steel pressure vessel shall be installed in- line to the air connection going to the hose reel. The solid odor neutralizing mass shall be placed inside the pressure vessel so as to slowly evaporate as air passes through the vessel. The odor neutralizing solid mass shall be Mother Nature's Odor Remover or equal. |
| 2.2.9 | Electric Panel: Electric panel shall be pre-wired 480V, 3 phase, 60 hz, NEMA 12, electrical control panel and shall be installed at each bellows containing a combination motor/starter. Provide overload protection in all three phases and all other necessary control relays, timers, and terminal blocks shall be furnished. Fan "Start/Stop" push buttons and pilot light shall be on the control panel door. |
| 2.2.10 | Pneumatic Panel: The panel shall have air controls for each vacuum line mounted on the bellows unit in its own enclosure. An air-control panel shall be mounted on the main support frame and shall contain a main shutoff valve, blow-down valve, Manual filter, and manifold leading to all controls. Each cylinder or pair of cylinders shall be controlled by its own air regulator. A gauge shall indicate the regulated pressure. All air-solenoid valves and pneumatic pressure switch shall be mounted on this panel. The panel shall contain all necessary controls to control one lane of vacuum operation. |
| 2.2.11 | Painting: All metal parts not galvanized shall be cleaned and covered with two coats of primer and two finish coats of semi-gloss industrial enamel paint. The finish color is to be selected by the district or project engineers. |
| 2.2.12 | Lid: The lid shall be 54 1/2 inches wide by 76 inches long using 2 inch by 2 inch by 1/4 inch square pipe frame with a 14 gage cover. It shall have a 1 inch by 1 1/2 inch hollow rubber seal fastened to the bottom with screws. It shall have two 15 3/4 inch diameter by 2 inch high collars on top for connecting flex duct to the cyclones. The lid shall be supported by above from 1 garage door spring and 2-1 1/2" springs. The lid shall lift approximately 1" up all around the trash container when unclamped. The clamps shall be a De-sta-co 53810 or equal and fasten the lid to the trash container in 4 places. |
| 2.2.13 | Stack Dampers: Two cyclone discharge opening stack dampers shall be installed to completely stop air from flowing through the vacuum system while the bellows is retracted. The stack dampers shall be a Model B476-2 or equivalent and shall consist of a 1/2" circular plate with a rubber seal that covers the blower discharge opening. The circular plate shall hinge on a 1" shaft located on one side of the discharge opening. The 1" shaft shall turn in two pillow block bearings. The stack dampers shall be actuated by a 3" by 10" air piston connected to an actuating arm protruding from one side of the 1" shaft. |
| 2.2.14 | High Level Detectors: Shall be acoustic type to shut-off the blower in case of a plug in the cyclone. It shall consist of an amplifier receiver (microphone) and a transmitter (loudspeaker) with the two sensors located 18" above the bottom of the cones on opposite sides of the cyclone. The sound shall not be audible to the human ear and a timer shall prevent false alarms. It shall shut-off the blower if a plug is detected. |
| 2.2.15 | Dust Control (optional): Shall consist of one to two air atomizing flat sprays to produce a water particle size of 10 to 50 microns and reduce emissions by 70%. Spray nozzles shall be directed into the air stream to assist in capturing small particles during the vacuuming cycle. Accessories located in the pneumatic control cabinet shall consist of : a liquid air regulator, an air regulator, two pressure gages, a liquid filter, two 115v. solenoid valves, and manual shut off valves. |
| 3.1 | INSTALLATION |
| 3.1.1 | The bus vacuum systems shall be installed in accordance with the manufacturer's instructions under the direction of the manufacturer's representative. |
| 3.2 | INSPECTION AND TEST |
| 3.2.1 | Each component of the bus vacuum system for each of the systems shall be tested for satisfactory operation. |
| 3.2.2 | Each system shall be tested for complete system operation. The following readings shall be taken and tests made by a qualified engineer. |
| a) | Current on all three legs of the fan motor with and without bus in position. |
| b) | CFM determined by pitot tube traverse and manometer taken in the flexduct 2 feet behind the bellows in the extended position with and without a bus in position. |
| c) | Inlet air temperature. |
| d) | Fan RPM. |
| e) | DB readings at 5 feet above floor level, 5 feet in front of the bellows (in the retracted position). |
| 3.2.3 | After each of the systems has been satisfactorily tested, all shall be tested with a sufficient number of buses to be assured that the installation shall clean buses in the specified time, as in actual operation. |
| END OF SECTION
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