335_SOW_SOS.pdf

PURCHASE DESCRIPTION FOR THE ACQUISITION OF

TWO PLASTIC MEDIA BLAST BOOTHS

SCOPE.

The content of this specification describes the minimum requirements for the procurement, delivery, site preparation, installation, integration, and commissioning of two (2) separate, independent, and equal-sized new Plastic Media Blast (PMB) booths for the Fleet Readiness Center, Southwest (FRCSW) in the Building 472 Blast Shop.

This procurement is structured as a full turn-key assembly. The Contractor shall assume single-point responsibility for delivering two completely functional, integrated, and ready-to-operate blast booths. The scope of this turn-key procurement includes, but is not limited to:

• Decommissioning, structural dismantling, removal, and disposal of designated existing blast booths and associated utilities.

• Comprehensive site preparation, including subsurface utility scanning, concrete foundation modifications, anchoring, leveling, and floor restoration.

• Engineering design, fabrication, supply, and delivery of all system structures, ducting, and components.

• Rigging, structural assembly, mechanical installation, and routing/connection of all electrical, pneumatic, and environmental subsystems.

• E-stop capabilities to ensure that the equipment shutdown can take place in the event the fire alarm goes off.

• Site acceptance testing, system-wide commissioning, compliance certifications, training of operators and maintenance technicians, and a single, unified system.

The blast booths shall be designed for the mechanical surface preparation/cleaning of various aircraft components, utilizing PMB technology. Upon final handover, the booths must be fully operational and ready for immediate production.

REQUIREMENTS.

Design.

The equipment offered shall be new and a current commercially available model. Prototype units, pre-production models, or experimental units do not qualify as meeting the requirements specified herein. The machine shall include all components, parts, and features necessary to meet the performance requirements specified herein. All parts subject to wear, breakage, or distortion shall be easily accessible for adjustment, replacement, and repair.

Measuring and Indicating Device Graduations. All measuring and indicating devices on the machine shall be graduated using inch and pound units of measurement.

Controls. All electrical, mechanical, hydraulic, and pneumatic operating controls shall be located convenient to the operator's workstation(s).

Safety and Health Requirements. All machine parts, components, mechanisms, and assemblies furnished on the machine, whether or not specifically required herein, shall comply with all of the requirements of OSHA 29 CFR 1910.

Audible Noise Level. Audible noise emitted by the equipment shall not exceed 84 decibels (dB), measured on the “A” weighted scale of a standard Type II sound level meter, at the operator's work position or any point at a distance of three (3) feet from the equipment. Noise generated by the work piece shall be excluded in determining compliance of the equipment with the 84 dB requirements.

Mercury Restriction. The machine shall not contain mercury or mercury compounds nor be exposed to free mercury during manufacture with the exception of fluorescent lighting where required.

Asbestos Restriction. Asbestos and materials containing asbestos shall not be used on or in the machine.

Lead. Lead and materials containing lead shall not be used on or in the machine with the exception to radiation cladding and lead solder in circuits.

Use of Polychlorinated Biphenyl (PCB). The use of polychlorinated biphenyl (PCB) on or in the equipment is prohibited.

Environmental Protection. Under the operating, service, transportation, and storage conditions described herein, the machine shall not emit materials hazardous to the ecological system as prohibited by Federal, state, or local statutes in effect at the point of installation.

Lubrication. Means shall be provided to ensure adequate lubrication (oil, grease, coolant, etc.) for all moving parts in accordance with manufacturer requirements. Each lubricant reservoir shall have at least a 24-hour capacity. All oil holes, grease fittings, and filler caps shall be easily accessible.

Replacement Parts. All parts subject to replacement shall be manufactured to definite dimensions and tolerances. Replacement parts shall be interchangeable without requiring modification. Replacement parts are those that are subject to wear or failure such as gears, bearings, shafts, feed screws, drive belts, pumps, and seals. Electrical replacement parts shall include but not be limited to, motors, relays, fuses, switches, magnetics, pushbuttons, light bulbs, braking mechanisms, and solid-state devices. Tooling and accessories normally supplied as standard items shall also be considered replacement parts.

Construction. The machine shall be constructed of parts that are new, without defects, and free of repairs. The structure shall withstand all forces encountered during operation of the machine to its maximum rating and capacity without distortion.

Castings and Forgings. All castings and forgings shall be free of defects, scale, and mismatching. No processes such as welding, peening, plugging, filling with solder or paste shall be used for reclaiming any defective part.

Fastening Devices. All screws, pins, bolts, and other fasteners shall be installed to prevent unintentional loosening. Fastening devices subject to removal or adjustment shall not be permanently installed.

Threads. All threaded parts used on the machine and its related attachments and accessories shall conform to FED-STD-H28B and the applicable “Detailed Standard” section referenced therein.

Gears. All gears shall be of proper width and size to transmit full-rated torque and horsepower throughout the speed ranges without failure for the expected service life of the machine. Gears in drive trains shall be hardened and ground steel.

Surfaces. All surfaces shall be clean and free of harmful or extraneous materials. All edges shall be either rounded or beveled unless sharpness is required to perform a necessary function. The condition and finish of all surfaces shall be in accordance with the manufacturer's commercial practice.

Welding, Brazing, or Soldering. Welding, brazing, or soldering shall be employed only where specified in the original design. None of these operations shall be employed as a repair measure for any defective part.

Painting. The machine shall be painted in accordance with the manufacturer’s commercial practice. All paint shall be of the lead-free type.

Workmanship. Workmanship of the machine shall meet all requirements specified herein and shall be of a quality equal to that prevailing among manufacturers producing equipment of the type covered by this purchase description.

Components.

The procurement consists of two (2) separate, independent, and equal-sized PMB blast booths. All sub-components shall be designed, engineered, and connected to operate seamlessly as distinct standalone units. The system shall consist of not less than the following components per booth:

Blasting Enclosure.

Each PMB booth enclosure shall be constructed as a single, unified, dust-tight structure, effectively containing all blasting media and debris. The exterior shall be fabricated from heavy-duty steel panels (minimum 3/16-inch or 10-gauge structural steel panels) treated with an industrial corrosion-inhibiting protective coating. The Contractor shall ensure that the walk-in PMB booth enclosure, architectural modifications, structural anchoring, and utility integrations comply with the 2025 California Building Code (Title 24), NFPA standards, and applicable local municipal ordinances. All access points and joints shall be fitted with heavy-duty elastomeric seals to prevent the escape of dust, debris, and media.

The blast enclosure structural steel framing, wall panels, and ceiling assemblies shall be designed to integrate with the floor anchoring systems required under the general seismic criteria of IBC Chapter 16. The interior walls and doors subject to direct or indirect media rebound shall be lined with a minimum 1/8-inch-thick replaceable, abrasive-resistant rubber or polyurethane liner.

The blast equipment design shall permit nozzle pressure measurement via a hypodermic needle pressure gauge immediately upstream of the nozzle. The Contractor shall supply two (2) NIST-traceable 0–100 psig hypodermic needle gauge kits with fifty (50) replacement needles per kit. Blasting air pressure shall be regulated via an electronic programmable logic controller (PLC) or equivalent hardware-interlocked pressure regulator providing closed-loop digital/analog control from 0 to 100 psig (with an accuracy of across the entire operating range), independent of media mass flow. The media feed system shall utilize a direct pressure design where media mixing with compressed air occurs upstream of the blast hose inlet.

Enclosure Dimensions and Workpiece Envelope: Each blast enclosure shall have minimum clear internal working dimensions to accommodate processing parts up to a maximum dimensional envelope of 16’ L x 4’ W x 2’ H, including sufficient clearance for safe operator movement, workpiece articulation, and material handling fixtures around the part.

Work Loading Door.

Each PMB booth enclosure shall feature heavy-duty, loading doors located on the front wall (width face) of the booth to facilitate loading and unloading of the maximum-sized component.

The door opening shall span a minimum of (or up to the maximum allowable width feasible within the front structural frame while maintaining proper clearances from aisles, walls and any other objects surrounding the booths. Doors shall swing outward, be structurally reinforced to resist sagging, equipped with heavy-duty industrial hinges, dual-point mechanical latching, replaceable elastomeric compression seals to guarantee a dust-tight and fit. Loading doors shall be safety-interlocked in accordance with Section 3.3.3.

Personnel Door.

Placement and Orientation: The personnel door shall be positioned along the accessible side wall or adjacent to the primary operator ingress/egress corridor, as coordinated with the final facility layout (Building 472 Blast Shop, Appendix A). The door location and swing trajectory shall be engineered to ensure that its operation does not interfere with or become obstructed by the opening of the main work loading doors or adjacent facility equipment.

Hardware and Safety Compliance:

• The personnel door shall swing outward (away from the blast chamber interior) in the direction of emergency egress in compliance with NFPA 101 (Life Safety Code) and OSHA 29 CFR 1910.36/37.

• A heavy-duty, double-glazed viewing window with an interior sacrificial plastic/glass shield shall be incorporated into the upper half of the door.

• The personnel door shall be equipped with safety interlocks compliant with this statement of work, ensuring that blasting ceases instantaneously if the door is opened.

Differential Pressure Sensor.

The design shall include provisions to maintain a negative air pressure of 1/4-inch water gauge (nominal) inside each blasting enclosure relative to the surrounding ambient room pressure during operation. A dedicated enclosure pressure monitoring system with digital/analog gauge readouts shall be installed to continuously monitor this negative enclosure pressure; this system must be safety-interlocked to automatically shut down the blasting system if the required negative pressure is lost.

Additionally, the Contractor shall supply and install separate, dedicated differential pressure gauges (Magnehelic gauges or approved equivalent, with a range of 0–5.0 inches water gauge) to independently measure the pressure drop across both the cartridge pre-filter stage and the HEPA filter stage to determine filter loading. All pressure sensors, switches, and gauges provided and installed by the Contractor shall be calibrated prior to final acceptance, and official calibration certificates shall be delivered to the Owner.

Blasting Equipment.

The blasting equipment for each separate booth shall be configured to accommodate up to two (2) operators simultaneously in each booth supporting independent dual-operator blasting operations within each booth. No internal partitions or dividers shall be used; the two booths shall function as completely distinct, independent, and equal-sized systems.

The blasting equipment, recovery systems, and process parameters shall comply with MIL standards, and be dedicated for use with approved plastic media. The systems must support continuous adjustments to accommodate media sizes of 600-850 microns and 425-600 microns.

Media Storage Hopper.The media storage hopper shall be designed to allow the full contents of the container to flow freely without the occurrence of media tunneling. The system shall support continuous blasting operations until the hopper is emptied. The media storage hopper shall be equipped with two (2) each butterfly discharge valves, each with a 4-inch diameter, located at the bottom of the hopper. These valves shall be positioned directly above the pressure vessels, allowing them to be opened as necessary to refill the pressure vessels based on operational needs. Hopper shall be designed to ensure that the federate does not exceed 800lbs/hr.

Pressure Vessel. The contractor shall install four (4) pressure vessels total per booth (two on each side). Each vessel shall conform to ASME Section VIII, Division 1, be registered with the National Board of Boiler and Pressure Vessel Inspectors for design pressures to 100 psig, and be equipped with pressure relief valves set at 90 psig. Minimum capacity of 6 cubic feet per vessel, with corrosion-resistant interior coatings, clean-out ports, and automatic pop-up valves for media feeding when blasting ceases. The pressure vessels shall each be fitted with a hand hole or clean out port suitably sized to facilitate inspection and cleaning. Media shall feed automatically into the pressure vessels via a pop-up valve that opens when blasting ceases.

Air Pressure Controls/Gauges. Controls shall indicate pressure vessel pressure in psi in increments of 1-psi with an accuracy of +/- 1-psi. Gauges indicating pressure with an accuracy of +/- 1-psi shall be provided for the pressure vessels. Gauge dial faces shall be 3.50-inches in diameter minimum and shall have a range of approximately twice the working pressure. Gauges shall be calibrated and certificates must be provided.

Media Flow Valve. Designed so that the manually adjustable metering function and the pneumatically operated valve actuation function are accomplished separately. It shall deliver 0 to 100% media flow (±1% across the entire range), be mounted at 45 degrees to the compressed air piping, include a clean-out access plate above the flow control area, and utilize a stainless steel metering plate.The metering valve shall allow fine adjustment from no-flow to fully open.

Blast Hose/Nozzle. Blast Hose/Nozzle. Each booth shall be provided with two (2) blast hose and nozzle assemblies. Each assembly shall include a boron carbide high-production nozzle with an inner diameter (ID) of 0.5 inch, a nylon quick-coupling nozzle holder (externally mounted), a pneumatic deadman switch with safety locks that meets OSHA requirements, and an ergonomic blast hose with an ID of 1.125 inch to 1.250 inch.

The length of the blast hose shall be no greater than the length of the PMB booth. The deadman switch shall be securely fastened to the blast hose. Nozzle air velocity and pressure shall be monitored via an integrated velometer and a hypodermic needle-type pressure gauge located immediately upstream of the nozzle. Nozzle air pressure (0–100 psi) shall be controlled independently of media flow via the PLC and manual method.

Control lines for the blast hoses shall utilize quick-disconnect fittings, shall be secured to the blast hose, and shall be arranged to avoid trip hazards. Nozzle system shall be designed so that media is fed smoothly without choking at low pressure (15psi).

Environmental Monitors, Gauges, and Testing Controls

The contractor shall provide and integrate specialized environmental monitoring and diagnostics components into the Plastic Media Blasting (PMB) booth system to ensure regulatory compliance and process quality control:

• Differential Pressure (DP) Gauges:

o The contractor shall install physical, industry-standard mechanical differential pressure gauges (e.g., Dwyer Magnehelic Gauges or government-approved equivalent) across all distinct filter banks, including the main booth air intake, booth exhaust system, and dust collector module.

o The contractor must supply certified manufacturer submittal documentation explicitly defining the baseline "Clean Filter" and "Dirty/Clogged Filter" differential pressure operating limits (expressed in inches of water column) to support the facility's environmental permitting process.

• Particle Contamination Sample Ports:

https://www.google.com/url?sa=i&source=web&rct=j&url=https://www.dwyer-inst.com&ved=2ahUKEwiRj7XJ1puXAxXuhSsGHeH6Kp8Qy_kOegYIAAgKEAQ&opi=89978449&cd&psig=AOvVaw2KvuaVBHsG0lB-YqOi_dcl&ust=1791042282466000 o The contractor shall integrate a minimum of two (2) dedicated particle sampling ports within the booth's air exhaust ductwork prior to the dust collector intake to allow internal personnel to extract and monitor dense particle air contamination.

• Media Reclaim & Magnetic Separation:

o The system's abrasive media reclaim loop must feature a high-efficiency cyclone dense-particle separator and a heavy-duty magnetic separator grid.

This configuration must be capable of isolating non-magnetic PMB media from dense, ferrous metal particulate contamination to allow for accurate waste-stream contamination weight auditing.

Floor Media Recovery System Each PMB booth shall be equipped with an automated, full-floor media recovery system spanning the entire blast enclosure floor.

Partial recovery systems, corner sweeps, or single-hopper dump pits requiring manual sweeping or shoveling of media during regular production are strictly prohibited.

The recovery floor shall be engineered to withstand continuous vehicular and foot traffic with a minimum grating load rating of point load (or rated to support the maximum part and handling cart weight). Grating and perforated sub-floor panels shall allow spent abrasive and debris to fall through into collection troughs below.

The floor reclaim drive mechanism shall utilize either:

a. A heavy-duty, bidirectional mechanical screw conveyor (auger/corkscrew) system with low-profile flighting, or

b. A pneumatic/oscillating floor recovery system conforming to ISO 4414 and OSHA standards.

All drive motors, bearings, couplings, and wear plates shall be located outside or sealed against the abrasive blasting stream to prevent premature mechanical wear. The recovery system shall automatically transport all fallen media and debris directly to the reclaim system elevator or cyclone intake at a minimum sweep/conveyance rate of ≥95% in ≤5 minutes during continuous operations, ensuring media recovery turnaround of in minutes during continuous operations.

Media Reclaim Equipment. The reclaim system shall receive debris from the underfloor recovery system, separate contaminants, and return usable media to the blast machine. The system shall consist of a cyclone separator, rotary airlock, magnetic particle separator, specific gravity separator, and a screen separator. It shall maintain media size per specified in the requirements listed in this document and heavy particle contamination below 200 ppm. The initial system setup shall process Plastic Type V, Size 30/40.

• Dense Particle Separator: Capable of maintaining dense particle contamination below the 0.020% limit. Reusable particles shall automatically recirculate back into the recovery system with equal size and distribution.

• Magnetic Field: Iron particles within the media stream shall be trapped via a magnetic separator, achieving a removal efficiency of at least 90% for an input contamination level of 0.15% by weight.

• Gravity Separator and Sieve: Reusable media particles shall pass through a specific gravity separator and a mechanical sieve sizing mechanism to achieve the proper mesh size.

Dust Control System. The ventilation and dust control system shall conform to 29 CFR 1910.94(a) and ensure a laminar, non-turbulent airflow throughout the booth enclosure. System controls shall include an automatic run-on timer ensuring the ventilation system continues to operate for a minimum of one (1) minute after blasting ceases. The design, installation, and operation of the dust control system, including static grounding and combustible dust hazards management, shall comply with NFPA 652 and NFPA 654.

Dust Collector. Sized to accommodate the dust-laden air streams generated by both the enclosure blasting operation and the reclaim system. Explosion venting shall be provided where contaminated air enters the dust collector compartment in accordance with NFPA 68, and explosion prevention shall comply with NFPA 69. The unit shall be a pulsejet, cartridge-type collector that is fully serviceable from the accessible sides.

Cartridge cleaning shall be automatic, controlled by a system capable of initiating the cleaning cycle via a 0–3 inch water column photohelic-type pressure gauge, with adjustments allowed for continuous cleaning capability and an integrated manual override for manual cleaning. The filtration system shall be a HEPA system capable of removing 99.97% of particles 0.3 micron or greater from re-circulation systems. Collected material shall be batch-discharged into 55-gallon steel drums for disposal through a dust-tight connection from the dust collector hopper to the waste drum.

Dust Collector Placement. The Contractor shall ensure that all dust collection equipment fits within the designated indoor footprint shown in the courtesy layout while strictly maintaining the mandatory booth dimensions specified in Section 3.4. If the indoor space is insufficient, the Contractor is permitted to utilize the exterior area directly outside Building 472 currently occupied by the existing softener tanks, subject to the following requirements:

a. Site Verification: The Contractor shall schedule and conduct a site walk with the Original Equipment Manufacturer (OEM) to confirm available exterior space and dimensions.

b. Pad Modification: The Contractor shall be responsible for all necessary modifications to the existing concrete pad to properly accommodate the size and weight of the dust collector.

c. Clearance Constraints: The concrete pad modifications and the dust collector itself shall not obstruct or impede existing grating areas, facility piping, or personnel egress pathways.

d. Building Integrity: If the equipment is placed outdoors, all associated tubing and utility routing must pass through the existing window opening. Penetrations through the building walls are strictly prohibited.

Dust Monitor. Equipment shall be installed to continuously monitor explosive concentrations of airborne dust within the PMB enclosure.

Waste Discharge. All waste from the reclaim system (excluding the dust collector exhaust) shall be discharged into 55-gallon steel drums via dust-tight attachments. Dust laden airstream shall discharge to a dust collector.

Breathing Air Systems. The contractor shall provide and install two (2) each, panel-mounted Grade-D breathing air filtration systems (one [1] system per booth) equipped with integrated continuous Carbon Monoxide (CO) monitors and audible/visual alarms in accordance with 29 CFR 1910.134.

Breathing Air Drops. The contractor shall install four (4) each breathing air supply line ports, two (2) ports on each side of the PMB booth. The ports shall be compatible with the Dixon 2FM2-B Industrial Interchange fittings.

Carbon Monoxide Alarm with Strobe. The contractor shall install two (2) each carbon monoxide audible and visual alarms, one (1) on each side of the PMB booth. These alarms shall be provided by the contractor. The contractor shall install the carbon monoxide alarms in locations that are most practical for the operator inside the booth, ensuring that the alarms are easily visible and audible to provide immediate warning in the event of a carbon monoxide detection.

Compressed Air Drop. The contractor shall install a complete compressed air distribution system for each PMB booth, consisting of two (2) 1-inch compressed air piping runs installed with one (1) run on each interior side of the booth. Along these runs, the contractor shall install a total of four (4) dual-outlet drop stations, configured with two

(2) stations on each side of the each booth. Each drop station shall feature dual 1/4-inch and 1/2-inch outlets equipped with Dixon 2FM2-B (or Government-approved equivalent) compatible quick-disconnect fittings, distributed along the booth walls to optimize operator reach, with at least one (1) station located adjacent to the personnel access door. All compressed air utilized by the system shall be obtained by tying into a single point of connection provided by the Government within the facility, and the contractor shall be responsible for all downstream piping, filtration, regulation, safety drop lines, and final connections to this single utility point. There shall be a total of four (4) breathing hoses, (2) for each booth.

Operator Interface and Controls Infrastructure. To ensure maximum reliability in highly abrasive environments and to facilitate seamless operation while wearing heavy-duty protective gear, the walk-in PMB booth shall utilize a 100% discrete, non-HMI hardware control interface. The integration of digital touchscreens, microdisplays, or multi-layered software menus is strictly prohibited. All system operations, adjustments, and monitoring metrics must be executed via dedicated, physical, panel-mounted components providing immediate tactile feedback.

Control Panel Enclosure and Environmental Ratings

a. Enclosure Rating: The main control panel shall be housed in a minimum NEMA

12 (dust-tight) / NEMA 4X (washdown resistant) industrial enclosure to prevent the ingress of fine blasting media, particulates, and airborne dust.

b. Component Protection: All pushbuttons, selector switches, and pilot lights shall be industrial 22mm or 30mm oil-tight/dust-tight specifications, utilizing heavy-duty silicone or rubber boots/shrouds to prevent mechanical jamming from media accumulation.

c. Identification: High-visibility, engraved plastic or metal legend plates shall be mechanically fastened below every operator device. Font sizes must be legible from a distance of no less than six (6) feet through protective hoods or visors.

Discrete Control Functions & Hardware Requirements. The contractor shall supply, wire and integrate the following physical controls on the primary control panel face:

a. Ventilation & Exhaust System: Controlled via a dedicated, maintained two-position selector switch or an oversized Green (Start) / Red (Stop) momentary pushbutton assembly.

b. Airflow / Fan Speed Adjustment: Manual speed modification shall be accomplished via a panel-mounted, heavy-duty analog potentiometer knob wired directly to the exhaust VFD's 0-10V or 4-20mA input circuit. Digital numerical keypads for speed adjustments are unacceptable.

c. Filter Pulse-Jet Cleaning System: The system must utilize a discrete, panel-mounted sequential pulse timer board featuring manual, analog trim potentiometers for "Time Between Pulses" and "Pulse Duration" adjustments.

d. Booth Lighting: Controlled via a single, heavy-duty, two-position maintained toggle or rocker switch.

e. Blasting Media / Gun Lockout: A dedicated, key-lockable or two-position selector switch to physically enable or disable the media delivery solenoids for safe booth maintenance.

System Monitoring and Safety Devices

f. Differential Pressure Monitoring: A flush-mounted, physical Magnehelic differential pressure gauge shall be integrated into the panel face to monitor filter loading and static pressure without requiring digital sensor calibration menus.

g. Emergency Stop (E-Stop): A prominent, latching, twist-to-release Red Mushroom-Head E-Stop push button shall be hardwired directly into the master control circuit. Actuation must instantly drop out all control relays, motor starters, and pneumatic solenoids independently of any secondary control timers or boards.

Electrical System. The machine shall conform to NFPA 79. The existing source power available at the facility is 480 Volt, 3 Phase, 60 Hertz (Hz). The machine’s electrical system shall be tolerant of fluctuation of ± 10 percent and shall not exceed a maximum of 400amps. The electrical system shall be complete, including any electrical transformer(s) required to modify the existing source voltage to the proper operating voltage of the equipment. A properly rated, and fused, single disconnect device shall be utilized on the machine with means of lockout in the off position only.

Electrical Enclosures. Construction of the electrical enclosures shall conform to NEMA ICS 6 standards. The enclosure shall be a NEMA 250 type 12 and shall provide for ventilation of components and shall be designed for an indoor non-hazardous location.

All electrical components shall conform to applicable NEMA ICS 1 and 6 standards. The machine shall be provided with interlocks on its electronic cabinet that shall instantly remove power from the equipment when the door is opened in accordance with NFPA 79.

Arc Flash Protection. The machine enclosures shall be marked for arc flash in accordance with NFPA 79 Paragraph 16.2.3 “Safety Signs for Electrical Enclosures” for arc flash safety.

Solid-State Components. Electrical devices used to power electrical servo and spindle motors of control voltage delivered to solid-state electrical components shall be solid-state devices. Such devices shall be equipped to handle the electrical load imposed by operation of the machine to its maximum potential. The use of selenium in solid-state components shall be restricted to those devices that protect other solid-state components from voltage surge.

Interlocks. Electrical interlocks shall be provided so that blasting shall not commence; or if currently operating, shall cease to operate if a work loading or personnel door is open or blast room ventilation not operating.

Motors. Motors shall be rated for continuous duty. Alternating-current (AC) motors shall be designed to operate on 60-Hz and each motor enclosure shall meet the requirements for a drip-proof enclosure. All motors shall meet the requirements of NEMA MG-1. Each motor shall have an identification plate in accordance with paragraph 3.6 to identify manufacturer, model number, serial number, voltage, amperage, horsepower, phase, frequency, and frame number. Motor horsepower shall be the manufacturer’s standard or standard optional horsepower as indicated on the manufacturer's design and construction drawing(s).

Work Light. Built-in work lighting shall be provided by the contractor. The light shall comply with NFPA 79 requirements, have a protective shield, and provide maximum light to the work area. The work lights shall be installed on the ceiling of the PMB booth.

The number and distribution of the lights shall be sufficient to provide even illumination across the entire work area, minimizing shadows and ensuring clear visibility of all surfaces. The lights shall be securely mounted to the ceiling, with consideration given to the height and layout of the booth to optimize light coverage. The mounting fixtures shall be durable and resistant to vibration and dust generated during blasting operations.

Exhaust Ducting. The contractor shall remove all existing exhaust ducting and ensure all openings are properly sealed and capped to prevent environmental intrusion.

Facility Connections. Electrical connections made to the facility electrical system shall conform to NFPA 70.

Hour Meter. The blast machine shall be equipped with an hour meter to indicate recovery system operation and for determining maintenance schedules. The meter shall be located on the main equipment control panel. The meter shall be of the non-resetting type and shall have a range of 0 to 99,999 hours in increments of 1/10-hour. The meter shall automatically reset to 0 hours after 100,000 hours have passed. The meter shall be designed to prevent the entrance of dust and moisture.

Size and Capacity. The PMB system shall consist of two (2) separate blast booths installed in a side-by-side configuration. The combined outer footprint of the entire dual-booth installation—including all structural walls, common partitions, and ancillary equipment—must fit within the maximum facility envelope defined in the Government-provided layout drawing (Attachment B). The 25’-11 ¾” dimension shown in the layout drawing represents the maximum allowable width for the entire combined installation, and all equipment must be engineered to fit within this designated footprint without encroaching on facility clearances.

Materials to be Blasted Steel, Aluminum, Composites

Part Size

Minimum: 1' L x 1' W x 1' H Maximum: 16' L x 4' W x 2' H

Total Floor Space Including Ancillary Equipment

Maximum: 49'-5 1/4" L x 25'-11 3/4" W x 25’ H

Available Space Floor to I-Beam Maximum: 25' H

Maximum Allowable Floor Space (internal)

49'- 5 1/4" Maximum: Within Total Floor Space

Maximum Allowable Space (external)

18.5’ W x 8’ D

Blast Room Size (Each) 24’ Lx 14’W x 12’H

Minimum Gage Thickness of Enclosure

>10 ga

Media Floor Recovery System

Full-floor automated recovery system across 100% of the internal floor footprint (Mechanical auger/screw or oscillating/pneumatic; partial recovery systems are not acceptable).

Power Requirements 480 V / 3 Ph / 60Hz/ 400 amps

Work Loading Door Total Dimension (Each Booth)

14’ W x 12’ H

Working Loading Doors Configuration

Swing Outward

Personnel Doors (1 per booth) 36” W x 84” H

Safety Interlock Required Full Turnkey Required

Standard Tooling and Equipment. All standard tooling and equipment required for proper operation of the machine (such as special tools needed for maintenance) shall be furnished. A list of these items shall be furnished at time of proposal.