O'brien Atkins

Mechanical Engineering

With an in-house Mechanical/Electrical/Plumbing Engineering Group, O’Brien Atkins offers added project coordination. We integrate the mechanical systems into the overall design process through collaboration with all design disciplines, offering accurate, efficient and thorough attention to detail.

The Mechanical Engineering Department at O’Brien Atkins designs innovative, energy efficient, sustainable, robust, and maintainable Commercial and Industrial HVAC, Building Automation and Control, HVAC and Process Piping, Building and Campus Utilities, plumbing, and fire protection systems. Expertise in total building systems energy cost comparisons, including Life Cycle Cost Analysis, using industry-standard performance simulation software, is a given. O’Brien Atkins has been designated as an EPA Energy Star Compliant Service Provider.

• Variable Refrigerant Flow (VRF) Systems
• Water-Source Heat Pump Systems
• Four-Pipe VAV Systems
• Warehouse Air Turnover Units
• Dedicated Outside Air Systems
• Total Energy Recovery Ventilation Systems
• Active and Passive Chilled Beams
• Demand Controlled Ventilation
• Air-Side and Water Side Economizers
• Custom Air Handling System Design
• High Rise and Atrium Engineered Smoke Control
• Refrigeration and Chiller Systems
• Packaged and Built-up Cooling Towers

• ISO 5, 7, 8 (EU Grade A, B, C, D) cGMP Cleanroom HVAC Systems
• HEPA Laminar Flow ISO 5 (EU Grade A) Integrated Ceiling Systems
• Liquid Lithium Bromide Desiccant (Kathabar) Dehumidification
• Silica Gel and Molecular Sieve Desiccant Dehumidification
• Air-Washers and Evaporative Cooling

• Hazardous Exhaust Systems
• Dust Collection Systems
• Bag Houses, Dust Collectors, Mist Eliminators
• Explosive Dusts, Explosive Hybrids
• Deflagration Chemical Suppression and Isolation, Explosion Venting
• Biosafety Level 1, 2, and 3 (BSL-1,2,3) Exhaust Systems
• Bag-In Bag-Out HEPA filtration System
• Activated Carbon Filtration Systems
• SMACNA Stack Design
• Ductwork Testing and Qualification




• Air Handling System Flow and Instrument Diagrams
• Piping and Instrumentation Diagrams
• Instrument Location Plans
• Instrument Indexes
• Instrument Datasheets
• I/O Lists
• Loop Sheets
• Control System Architecture Drawings

• Low and High Pressure Underground and Rack Steam and Condensate
• Underground and Rack Chilled Water
• Chilled Glycol
• Heating Hot Water
• No 2 Fuel Gas Piping
• High Purity Liquid and Gas Systems
• Water for Injection (WFI)
• Reverse Osmosis Water (RO)
• Deionized Water (DI)
• IPA Solvent Recovery and Distribution Systems
• Propanol Solvent Recover and Distribution Systems
• Concentrated Caustic Storage and Distribution Systems
• Process Clean Dry Compressed Air
• Process Oxygen (O2), Carbon Dioxide (CO2), Nitrogen (N2)
• Semi-Conductor Production Toxic Gas Systems
• Natural Gas
• House Keeping Vacuum Systems
• Process Liquid Waste Systems

• Campus Steam and Condensate
• Campus Chilled Water
• Heating Hot Water Systems
• Product Contact Process Cooling Fluid Systems
• Process Cooling Fluid Systems
• Clean Dry Air Systems
• Nitrogen Generation Systems
• Bulk Gas and Liquid Storage
• Campus Chilled Water

• Domestic Hot and Cold Water
• Sanitary Waste and Vent
• Ultra-Low Flow Fixutres
• Combination Waste and Vent
• Industrial Clarifiers
• Automotive and Mechanical Room Oil Separation
• Grease Interceptors and Traps
• Lift Stations

• Wet Pipe Sprinkler Systems
• Dry Pipe Sprinkler Systems
• Diesel and Electric Fire Pumps
• Combination Standpipe Fire Sprinkler Systems
• Manual Wet and Dry Standpipe Systems
• Automatic Wet Standpipe Systems
• High Bay Rack Storage ESFR Systems
• In-Rack Sprinkler Systems