The bus wash system shall be capable of effectively washing all vertical and horizontal surfaces of the bus when the vehicle is travelling through the system at a uniform speed of approximately 1'-0" per second. The system shall include the following basic components:
STRUCTURAL AND TECHNICAL DETAILS
2.1 PREWET / DETERGENT SPRAY ARCH - The prewet detergent spray arch assembly shall be free standing canted frame constructed of 1-1/2" diameter schedule 40 galvanized pipe with 150 pound galvanized fittings. It shall be supported by (2) floor anchored "A" braces with (8) 1/2" diameter plated cinch anchors.
2.2 SUPPORT COLUMNS AND BRIDGE STRUCTURES -
Primary Vertical Support Columns: Minimum of (2) columns. (2) Columns to be 10" square x .250 structural steel tubing with 3'-0" square x .750 thick base plate gussetted with (3) 3/8" gussets per column.
Base Plate Anchorage: (4) 1-1/4"x9" Rawl-Studs each plate.
Main Support Column Bracing: The main support column shall be braced with (2) C6x8.2 pound structural channel. Columns, base plates, gussets and channel braces shall be firmly welded in place.
Bridge Structure: The bridge structure for vertical brushes shall be designed to secure both side support structures, and shall be fabricated from C6x8.2 pound structural channel. Said structure to be cross braced by 2"x2"x.250 structural angle, secured to each column by means of (6) 1/2" diameter Grade 5 cadmium plated hex head cap screws.
2.3 BRUSH YOKE ASSEMBLIES - The brush arm shall be curved to allow clearance for the extreme corners of the bus during the washing motion. All structural members shall be designed and sized to withstand stresses encountered without deformation. The top and bottom brush yoke arm shall be 4"x3"x.250 structural tubing. Yoke arms to be cold formed with 12" radius bends to allow bus clearance. Pivot shaft shall run the full length of the brush and be fabricated from 4"x4"x.250 structural tubing with machined stub shafts welded at each end to accept 2-1/4" bore pillow block bearings. Additional supports to yoke arms shall be fabricated from 3"x3".250 structural tubing.
2.4 BRUSH SHAFT ASSEMBLIES - Brush shafts shall be a minimum of 2-1/4" structural tubing. Keyed brush shafts shall be mounted on (2) heavy-duty, grease reservoir, self-aligning, pillow block ball bearings, mounted on brush arms.
2.5 RINSE ARCH - The rinse arch assembly shall be a canted free standing frame constructed of 1-1/2" diameter schedule 40 galvanized pipe with 150 pound galvanized fittings. It shall be supported by (2) floor anchored "A" braces with (8) 1/2" diameter plated cinch anchors.
2.6 PIPE TYPE TIRE GUIDES - The guides shall be fabricated from 4" diameter black pipe with welded, smooth ground, front flares to insure proper alignment into washer. The tire guides shall be anchored every 3'-3" with 3/4" diameter plated cinch anchor bolts. Tire guides shall run the full length of the wash system.
2.7 FINISH - All fabricated sections of washer frame, brush yokes and arms, spray arch frames, and miscellaneous structures, shall be hot-dipped galvanized after fabrication per ASTM A123 or A385. Metallic surfaces not suitable for galvanizing shall be coated with 95% zinc primer and covered with durable machine enamel. All erection bolts shall be plated Grade 5.
BRUSHES
3.1 WRAP-AROUND BRUSHES -
General Description: Provide (2) pair; (1) pair each side, electric motor driven brushes to continuously wash front, sides and rear of vehicles passing through washer, commencing washing at middle of vehicle front. As vehicle proceeds along line of travel, brushes will clean across front, down sides, and back across rear of vehicle. After vehicle has passed beyond brushes, they shall automatically cease operation and come to rest ready for next wash cycle. All brush yokes shall retract when power is off, permitting unobstructed vehicle passage through wash lane.
3.2 BRUSHES - Each brush shall be made up of 18" long sections of extruded aluminum cylindrical cores split for easy replacement. The brush section shall be mounted at brush shafts by means of aluminum bolting collars. The brush fill shall be .044 (Circuleen) material, locked into steel backed brush strips which are locked into the brush cores. Minimum diameter brushes shall be 60". Brush fill material shall be hollow polypropylene filament of a type and style designed not to scratch SAR and Swedlow Acrivue plastic windows. Brushes shall be gripped in a 20-strip core brush. The bottom (3) sections of the brush shall be full loop, extra-heavy density, .044 (Circuleen), 110 to 120 tips per inch. The top (3) sections shall be .020 (Polylite), full loop, heavy density, 160 to 170 filaments per inch.
SPRAY ASSEMBLIES
4.1 PREWET / DETERGENT SPRAY ARCH - The prewet / detergent spray arch shall be constructed of 1-1/4" diameter schedule 40 galvanized pipe with 150 pound galvanized fittings. A total of (22) brass spray nozzles shall be supplied applying 44 gallons per minute of detergent laden water. The nozzles shall be secured in tapped holes in the spray arch. The nozzles shall have a spray angle of 35ü. An 8'-6" suspended length of 1-1/4" schedule 40 galvanized pipe shall be teed from the center of the prewet arch for location of a vehicle actuated dangle switch. The 8'-6" length of pipe shall be cap welded, ground, and threaded to prevent water from entering the dangle switch support. Water to prewet spray arch shall be controlled by a 110 volt, 1-1/4" slow closing water solenoid valve. (3) Drag mops shall be provided on this arch for cleaning vehicle roofs.
4.2 DETERGENT SIPHON SYSTEM - The detergent siphon system shall be fabricated from 150 pound galvanized, malleable iron fittings and schedule 40 galvanized pipe. The siphon shall be constructed in (3) tiers; (1) tier for the prewet/detergent arch and mop sprays, and (2) tiers for the machine brush sprays. All (3) tiers shall be solenoid controlled, ball valve regulated, pressure gauge monitored, and siphon operated. The siphon shall use the Venturi injection principle and shall be adjustable by threaded needle valve. The siphon system shall be pre-assembled and bracketed for field installation. All tiers of the siphon shall be 1-1/4" pipe size with a teed 3/4" pipe size siphon lines. Ground joint unions shall be supplied at all solenoid valves and siphon injectors. All ball valves and solenoid valves shall be bronze bodied and rated for 300 PSIG of water pressure. All siphon gauges shall be 2-1/2" dial face, 0-160 PSIG plastic bodied and glycerine filled.
4.3 BRUSH SPRAY PIPES - Provide entire height of each brush with overlapping spray pattern of water/detergent solution at 25 gallons per minute minimum. Pipes to be fabricated from 3/4" galvanized schedule 40 spray pipe with not fewer than (9) brass spray nozzles.
4.4 RINSE ARCH - The rinse arch shall be constructed of 1-1/2" diameter schedule 40 galvanized pipe with 150 pound galvanized fittings. A total of (22) brass spray nozzles shall provide a flow rate of 110 gallons per minute of rinse water. The spray angle of the nozzles shall be 35ü, and the nozzles shall be secured to the rinse arch by means of 3/8" diameter tapped holes. NOTE: All flow rates based on 40 PSIG of water pressure. Operation of the rinse arch shall be controlled electrically by means of a 2" slow-closing water solenoid valve.
MOTOR AND DRIVES
5.1 BRUSH DRIVES - Brushes shall be driven by a 5 horsepower, totally enclosed fan cooled, NEMA design "B" electric motor, bolted to a right angle gearhead reducer, producing a 96 RPM brush speed. The output shaft of the gear reducer shall be coupled to the brush shaft with a flexible coupling with removable tapered bushings - all permitting brush shaft to be removed without disturbing gear motor assembly.
BEARINGS
6.1 BRUSH SHAFT BEARINGS - The brush shaft shall be attached to the brush shaft yoke by a minimum of (2) 1-3/4" heavy duty, self-aligning, eccentric locking, single row, ball bearings.
6.2 PIVOT SHAFT BEARINGS - The brush yoke pivot shaft shall be attached to the main support column by a minimum of (2) 2-1/4" heavy duty, self-aligning, eccentric locking, single row, ball bearings.
6.3 BEARING GUARD AND ANTI-WRAP DISC - Each brush shall be equipped with a bearing guard and anti-wrap disc located above the bottom pillow block. Bearing guard to be fabricated from 1/8" steel plate and attached to brush shaft by means of (1) 2-1/4" locking collar. Above bearing guard shall have on 18" diameter anti-wrap disc fabricated from 3/8" thick neoprene impregnated nylon cord.
CONTROLS
7.1 PREWIRED CONTROL PANEL -
Electric Control Panel: Control panel shall be housed in a NEMA #12 enclosure. A through the door, mainline, non-fused disconnect shall be located for shutdown of electrical functions. The control panel shall be supplied with individual starters and circuit breakers (no fuses) for all system motors. A machine tool transformer shall provide power reduction to 110 volt control circuit. The control panel wiring shall be color coded, and numbered for easy identification. The control panel shall be completely prewired, and internal wiring shall be terminated at numbered terminal strips. A programmable controller shall be used for all relay and timing control functions. Electro-mechanical relays are not acceptable. The programmable controller shall be pre-programmed in standard ladder logic. Its features shall include diagnostic capability, expandability to 112 inputs or outputs, 700 words of memory - expandable to 1700 words of memory (CMOS, RAM or Prom), modular plug-in construction, snap-on handheld programming panel capable of monitoring logic, timer, counter values and input and output points - LED lights indicating input and output function. Selector switches shall be provided for various operational modes of wash system, as well as power on and emergency off switches mounted through the enclosure door.
Mode Selection Shall Be:
7.2 MODE SELECTION SWITCHES - The control panel shall have the following pushbuttons and selector switches prewired into control panel door:
7.3 HIP AND DANGLE SWITCH ACTUATOR - Automatic control of the bus washer equipment shall be designed so that each stage of the bus wash is switch activated ahead of the approaching bus and deactivated after the bus has passed. Controls for automatic operation shall consist of vehicle actuated hip and dangle switches. Each switch shall be gasketed and equipped with a cannon plug and receptacle. The switches shall be spring operated, with spring loaded silver contacts, and each switch shall be supplied with a vinyl covered fiberglass contact rod.
AIR CONTROLS
8.1 AIR CONTROL PANEL - Air control, each air cylinder shall have its own air control for adjustment of air. The air control shall consist of a 3/8" ball valve, combination filter, regulator, lubricator and air valve, all factory pre-assembled and mounted inside a NEMA #12 fiberglass enclosure. Both filter and lubricator sight bowls shall protrude through the bottom of the air control enclosure for maintenance inspection. The control plate shall be mounted to the outrigger of the main column assembly within easy reach of maintenance personnel. All air control components shall be 3/8" pipe size, rated to 150 PSIG maximum working pressure. All air hoses shall be rated to 250 PSIG, and shall be of the two braid type with swivel fittings one end. Fittings for air equipment shall be 150 pound galvanized malleable iron. All air controls shall include the following:
8.2 3/8" BALL VALVE - Bronze bodied, rated to 300 PSIG installed ahead of all air equipment.
8.3 COMBINATION FILTER / REGULATOR -
8.4 LUBRICATOR -
8.5 AIR CONTROL VALVE -
8.6 AIR CONTROL MUFFLER -
8.7 AIR HOSES -
8.8 AIR CYLINDERS - The movement of the brush arms shall be by means of air cylinders. The cylinders shall be of Class I, 4" diameter by 15" stroke, with stainless steel shafts. Trunnion mounting shall be used on cylinders. Trunnion bearings shall be single row, 2-bolt, flange ball bearings, equipped with grease fittings. (2) Flange bearings shall be used per cylinder.
DRAWINGS, OPERATION AND MAINTENANCE MANUALS, WARRANTY AND
SERVICE REQUIREMENTS
9.1 Complete piping, wiring, assembly and foundation drawings shall be supplied by the wash system manufacturer. Such information to include (3) Sets of Operating and Maintenance Manuals.
9.2 Upon completion of equipment installation, a qualified representative of the manufacturer shall be present to check-out the equipment, place into initial operation, and instruct the owner's personnel in the operation and proper care of the equipment.
9.3 WARRANTY - The wash equipment 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.
9.4 SERVICE REQUIREMENTS
