Exhibit A Everett Compressor scope v.2.pdf

Exhibit A: Specifications

RFP 166-25: Everett Maintenance Facility – Compressor Supply and Installation

Purpose

The Massachusetts Bay Transportation Authority (MBTA) requires the supply and installation of a complete compressed air system to support four Diesel Particulate Filter (DPF) cleaning machines located in the Everett Repair Bays, Everett, Massachusetts. The system must deliver reliable, high-quality compressed air under demanding shop conditions to ensure continuous operation of emissions control maintenance activities.

1. Rotary Screw Air Compressor

• Type: Air-cooled, oil-injected rotary screw.

• Capacity: Minimum 600–700 CFM at 100 PSIG to support four Diesel Particulate Filter

(DPF) machines (each requiring at least 120 CFM at 100 PSIG), with reserve capacity.

• Motor & Drive: Minimum 125–150 HP motor. Unit shall be equipped with a Variable

Frequency Drive (VFD) to optimize energy efficiency under varying demand

• Noise & Heat: The compressor shall have a maximum sound level of 80 dBA or less at 1 meter, as specified by the manufacturer.

• The supplier shall also provide heat rejection data. The unit shall be designed for operation in Everett repair bay conditions and shall include provisions for adequate ventilation.

2. Receiver Tank

• Design: Vertical ASME-coded air receiver, approximately 400 gallons, sized for compressor output.

• Orientation: Vertical configuration required due to space constraints.

• Accessories: Drain valve, safety valve, pressure gauge.

• 3. Refrigerated Air Dryer

• Capacity: Sized to handle full compressor output.

• Performance: Deliver pressure dew point of 38–40°F or better.

• Filtration: Include pre- and after-filtration, with minimum 1 micron particulate and oil-coalescing filter to protect sensitive equipment.

3. Refrigerated Air Dryer

• Capacity: Sized to handle full compressor output.

• Performance: Deliver pressure dew point of 38–40°F or better.

• Filtration: Include pre- and after-filtration, with minimum 1 micron particulate and oil-coalescing filter to protect sensitive equipment.

4. Installation Scope

• Contractor shall provide complete installation, including but not limited to:

• Vibration isolation mounts on the existing concrete pad as recommended by the manufacturer.

• All piping and connection work to the four DPF machines.

• Electrical power run-up, conduit, disconnects, and controls integration.

• Commissioning of equipment and operator training.

5. Service & Maintenance

• Contractor shall provide a minimum 1-year service and maintenance plan performed by the OEM or a certified service provider.

• Plan shall include scheduled preventive maintenance, inspections, adjustments, lubrication, and replacement of consumable items (e.g., oil, filters, belts) necessary to keep the system in proper operating condition.

• Maintenance plan shall begin upon commissioning of the system.

6. Warranty & Compliance

• Manufacturer shall provide a minimum 1-year full package warranty covering defects in materials and workmanship, and a 5-year warranty on the compressor airend.

• All pressure vessels shall be ASME coded.

• Electrical components shall be UL listed or equivalent.

• All equipment shall comply with applicable codes and standards.

7. Environmental Operating Conditions

• The compressor and all associated equipment (receiver, dryer, and filtration system) shall be suitable for continuous operation in the Everett Repair Bays, Everett, Massachusetts.

• Equipment shall be rated for operation at ambient conditions ranging from 40°F to 95°F with relative humidity up to 95% non-condensing, or better, as documented by the manufacturer.

• All enclosures, controls, and components shall be appropriately protected against corrosion and moisture ingress (minimum NEMA 12 / IP54 or equivalent).