Specification
Bus Vacuum System
Model EC-15

Scope

• 1.1 This specification describes a Vacuum Type Bus Cleaner, hereinafter called "Vacuum", for the removal of dirt and debris from the interior of transit coaches. All assemblies and components shall be new and shall be supplied, installed and integrated into a system that efficiently performs the intended function.
• 2.1 All bids shall be accompanied by a general layout drawing and specification describing the Vacuum offered and its method of operation.
• 2.2 All work shall be done in a thoroughly first-class and workmanlike manner; conform to all Federal, State and local codes and laws; and be executed in accordance with this specification.

Vacuum

• 3.1 The Vacuum shall be designed to provide for the collection of debris in dry form and discharge after compacting of same into a rear of refuse truck loading dumpster of the type presently used. Provisions shall be made for minimizing the exhaust of dust inside the building through double filtration. 100% of the air input shall be returned to the garage area.
• 3.2 A plenum connected to the bellows assembly shall be fabricated from minimum 12-gauge galvanized sheet steel, welded to structural framework of angles and channels, all of sufficient rigidity to support the cantilevered load of the extendible bellows assembly and the imposed load of the overhead duct work, plenum to be mounted on angle legs with base plates drilled to receive anchor bolts.
• 3.3 Bellows assembly shall be fabricated from heavy neoprene impregnated nylon or equally durable and impervious (to air and dust) material, constructed with aluminum stays and mounting strips to form an accordion type retractable assembly with foam rubber padding covered by the same material as used for the bellows, all firmly attached to the outer perimeter of the bellows assembly to assure a snug fit to the front door of the owner's buses. The complete assembly shall be hung from a swivel suspension frame attached to an overhead trolley carriage, riding overhead rails, which rails shall be an integral part of the plenum housing requiring no additional exterior support. Equipment shall include (2) double-acting, long stroke, trunnion mounted air cylinders to extend and retract the bellows assembly; equipment to include air solenoid control valve, adjustable flow control, moisture drain trap assembly, air reducing valve, and air cylinder lubricator.
• 3.4 Duct from bellows plenum to collection receptacle shall be fabricated from minimum 12-gauge galvanized sheet steel, properly reinforced to withstand the negative pressures involved. Duct from the dust separator to the dust collector shall be of a minimum 22-gauge galvanized steel flue ducting or plastic pipe or air duct hose.
• 3.5 Fans and motors (2) each, 36" diameter propeller type shall be high volume aerodynamic balanced type each rated for 18,000 CFM free air against a static pressure of 1-3/4" water gauge. The fans shall be mounted in housings fabricated from minimum 12-gauge galvanized steel.
• 3.6 Refuse collection receptacle shall be double chambered and fabricated from formed galvanized sheet steel panels. Receptacle shall be approximately 600 cubic feet mounted on a supporting structure of heavy steel plate with structural steel legs. A hoppered outlet shall be provided in the minimum 7-gauge galvanized steel floor of the support structure. Intake chamber shall be completely closed at the top and incorporate a system of interior screen baffles. The open top of the outlet chamber shall be fitted with screening of suitable mesh sized for the purpose. Access to each chamber shall be provided via galvanized hatchways in the steel side walls.
• 3.7 Air cleaning equipment for the air being returned to the garage area shall be accomplished by (2) special cellular inertial separators, each cell to consist of U-shaped blades arranged to present a circuitous path to the air flow and to redirect the air toward the clean air outlet.

These blades shall be fabricated from no less than 20-gauge, high strength, low alloy, corrosion resistant steel. The air passage way between adjacent blades shall be not less than 3/16". Cells shall be phosphatized and given one coat of zinc chromate primer and one finish coat of gray enamel.

The efficiency of the air cleaner shall be not less than 94% using Standardized Air Cleaner Dust Test, coarse, with an inlet air flow of 1,000 CFM per single cell when using a bleed rate of 10%. Pressure loss from the inlet to the clean air outlet shall not exceed 0.8" water gauge at this air flow. Each of the (2) inertial separators shall be equipped with a bleed air duct, connected to a powered dust collector.

Dust collectors of the bag type, shall have a minimum 7-1/2 horsepower, totally enclosed fan cooled motor driven blower unit. Collector shall bleed a minimum of 10% of the air input to the refuse collection receptacle and shall have a cloth area of not less than 350 square feet. Collector shall have dust pan capacity of not less than 15 cubic feet, and shall incorporate a bag shaker.

• 3.8 Motor starters and all controls shall be prewired at the factory in a NEMA #12 enclosure. Start/stop push-button shall be housed in a NEMA #4 enclosure mounted within the bellows assembly for easy access by the operator.

• 3.9 Testing - Owner, at his option, may test the quality of the Vacuum air cleaning efficiency as follows:

• A. The test shall not be performed until at least one week after the Vacuum has been in full operation cleaning buses.
• B. Owner, at his expense, shall hire an independent laboratory to perform an air quality test. This test shall use air monitoring cassettes with pre-weight filters, to detergent the total amount of suspended particulate introduced by the Vacuum into the shop air.
• C. The laboratory will set (4) air monitoring cassettes in the vicinity of the Vacuum, not closer than 15 feet and not greater than 50 feet.
• D. The level of background particulate in the air shall be determined during the (4) hour period immediately preceding the cleaning of buses with the Vacuum. The filters will then be weighed to determine the number of milligrams of particulate collected per cubic meter of air and the results averaged.
• E. New pre-weighed filters will then be inserted in the cassettes for a (4) hour period during which busses will be vacuumed, using normal operating procedures. The filters will then be weighed to determine the number of milligrams of particulate collected per cubic meter of air and the results averaged.
• F. The Vacuum particulate efficiency will be acceptable if the difference between paragraph (D) and (E) above is (10) milligrams or less per cubic meter of air.
• G. If the difference between paragraph (D) and (E) above is greater than (10) milligrams per cubic meter of air, the efficiency of the Vacuum is unacceptable. The contractor shall take corrective actions, subject to owner's approval, as are necessary to cause the Vacuum to meet the requirements in paragraph (F) above. Sprays and redirection of outlet air flow are not acceptable.
• H. Additional tests if required by owner shall be at the expense of the contractor.

• 3.91 Miscellaneous Items: The Vacuum shall include an "off/on" control in the bellows assembly and 50'-0" of 3/8" I.D. air hose and (2) air sweep guns. Each assembly shall be equipped with (1) projector type flood light unit, complete with swivel receptacle for lighting the stepwell of the coach. Interior of the trash house shall be equipped with specially designed air deflecting baffles and screening to control direction of air flows and debris.
• 3.10 Refuse Compactor: A trash compactor shall be provided complete with a specially designed receiving hopper to encompass the roller slide gate of the discharge hopper on the trash house or approved equal. Compactor shall have as minimum:

• Capacity - 0.5 Cubic Yards
• Floor Material - 1/2" Plate
• Side Material - 1/4" Plate
• Outside Reinforcement - 6" Channel
• Ram Panel - 27" x 30"
• Breaker Bar - 4"x4"x1/2" Angle
• Piston - 4"x2"
• Stroke - 40"
• Penetration - 9"
• Operating Pressure - 1,750 PSIG
• Maximum Force - 21,990 Pound
• Cycle Time - 45 Seconds Maximum
• Motor - 3 Horsepower
• Valve - 1/4" 4-Way Double Solenoid
• Reservoir - 10.5 Gallon
• Controls - Weather-proof Key Start,
• Electric Eye Level Control

Compactor equipment shall include (2) compacting containers, (2) yard capacity each, fabricated from 12-gauge sheet steel suitably reinforced by structural steel members. Each container shall ride on (2) swivel and (2) rigid casters with 6" rubber-tired wheels. Containers shall be for rear or front loading refuse trucks. (Owner to specify).

• 3.11 Finish: All fabricated sections of cleaner shall be hot-dipped galvanized after fabrication per ASTM A123, or latest revision. Metallic surfaces not suitable for galvanizing shall be coated with 95% zinc primer before painting. All nuts and bolts shall be minimum Grade 5, including compactor and compactor containers. Any steel surfaces which are not galvanized shall be primed and painted in accordance with the highest standards of the industry. Color shall be manufacturer's standard. Priming and painting shall be in accordance with paint manufacturer's recommendations. Paint shall be acrylic enamel or polyurethane.
• 3.12 After field assembly, all panel and dust interfaces shall be carefully caulked to prevent air leakage between the various connecting assemblies.

Warranty

The Vacuum system shall be warranted against defective parts and faulty workmanship for a period of twelve months from the date of start-up. This warranty shall consist of the replacement and installation of defective assemblies or parts without cost to the owner for a period of 90 days. From 91 days to 365 days after start-up, the warranty shall consist of replacement of parts only at no cost to the owner. This warranty shall not cover malfunctions of valves due to foreign objects in the supply lines, malfunctions due to freezing, malfunctions due to maladjustments of controls because of tampering by unauthorized personnel, or malfunctions due to misuse or abuse of the equipment.

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