NIH ORF Bldg. 28 HVAC System Modification

*As of August 15, 2023, the bids are pending at the owner. 1. CHILLED WATER PIPING - MECHANICAL ROOM: 1.1 DEMOLISH AND REPLACE THE EXISTING CHILLED WATER SUPPLY AND RETURN PIPING FROM THE UTILITY TUNNEL IN BUILDING 14E TO THE ISOLATION VALVES ON THE ROOF OF THE BUILDING 28 COMPLEX FOR EACH OF THE FOLLOWING AHU: 28-D-1, 28-C-2, 28-C-1, 28-B-1, 28-A-2. 1.2 DEMOLISH UNUSED EQUIPMENT AND ABANDONED PIPING IN MECHANICAL ROOM 14E. 1.3 FIRE STOP ALL PENETRATIONS THROUGH FIRE WALLS. 2. CHILLED WATER PIPING - ROOFTOP: 2.1 DEMOLISH ALL HEAT TRACE AND INSULATION FROM THE PANEL TO EACH AHUs. 2.2 REPLACE ALL INSULATION. FOLLOW INSULATION MATERIAL SPECIFICATIONS. 2.3 WEATHER SEAL ALL NEW ROOF PENETRATIONS. 2.4 BALANCE ALL CHILLED WATER VALVES AFTER INSTALL. BALANCE THE SYSTEM SO EACH AHU RECEIVES THE DESIRED CHW FLOW RATE. 3. PREHEAT COILS: 3.1 DEMOLISH AND REPLACE THE PREHEAT COILS FOR AHU 28-D-1, 28-C-2, 28-C-1, 28-B-1, AND 28-A-2. 3.2 DEMOLISH AND REPLACE ALL STEAM AND CONDENSATE PIPING FROM THE PREHEAT COILS TO THE LAST GATE VALVE FOR EACH AHU. 3.3 REPLACE ALL INSULATION DAMAGED OR REMOVED DURING DEMOLITION OF THE PREHEAT COILS AND PIPING. FOLLOW INSULATION MATERIAL SPECIFICATIONS. 4. BUILDING AUTOMATION SYSTEM (BAS) UPDATES: 4.1 UPDATE BAS GRAPHIC FOR EACH AHU TO SHOW PREHEAT COIL UPDATES. 4.2 UPDATE BAS GRAPHIC TO REMOVE DEMOLISHED CHW POINTS AND EQUIPMENT. 4.3 UPDATE SIEMENS PPCL CODE. REMOVE OBSOLETE CODE REFERRING TO THE DEMOLISHED BUILDING 28 CHILLED WATER SYSTEM AND ASSOCIATED EQUIPMENT. MODIFY THE PREHEAT CODE FOR EACH AHU TO CHANGE FROM FACE/BYPASS TO FULL FACE PREHEAT COILS AND FROM A SINGLE STEAM CONTROL VALVE TO A 1/3RD 2/3RD STEAM CONTROL VALVE SYSTEM. 4.4 INSTALL LOCAL CHILLED WATER DIFFERENTIAL PRESSURE SENSOR IN MECHANICAL ROOM 14E. *The value for this project is based on a financial range. The value is listed as the highest possible cost from the range provided by a stakeholder or official project document.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 03 -	Concrete, Cast-in-Place Concrete, Precast Concrete.
Division 04 -	Masonry, Unit Masonry.
Division 05 -	Metals, Structural Metal Framing, Metal Fabrications.
Division 06 -	Wood, Plastics, and Composites, Rough Carpentry, Finish Carpentry, Architectural Woodwork.
Division 07 -	Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection, Thermal Insulation, Weather Barriers.
Division 08 -	Openings, Doors and Frames, Metal Doors and Frames, Wood Doors, Plastic Doors, Specialty Doors and Frames, Entrances and Storefronts, Curtain Wall and Glazed Assemblies, Windows, Hardware.
Division 09 -	Finishes, Plaster and Gypsum Board, Tiling, Acoustical Ceilings, Flooring, Resilient Flooring, Carpeting, Acoustic Treatment, Painting and Coating, Painting.
Division 10 -	Specialties, Visual Display Units, Signage, Compartments and Cubicles, Toilet Compartments, Partitions, Emergency Aid Specialties, Fire Protection Specialties, Fire Protection Cabinets, Fire Extinguishers, Storage Assemblies, Flagpoles.
Division 11 -	Equipment, Laboratory Equipment.
Division 12 -	Furnishings, Window Treatments, Casework, Office Furniture, Multiple Seating.
Division 14 -	Conveying Equipment.
Division 21 -	Fire Suppression, Fire-Suppression Sprinkler Systems, Fire-Extinguishing Systems.
Division 22 -	Plumbing, Instrumentation and Control for Plumbing, Plumbing Piping, Facility Water Distribution, Facility Sanitary Sewerage, Facility Storm Drainage, Plumbing Equipment, Plumbing Fixtures.
Division 23 -	Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Piping and Pumps, HVAC Air Distribution.
Division 26 -	Electrical, Instrumentation and Control for Electrical Systems, Interior Lighting, Emergency Lighting, Exit Signs, Exterior Lighting.
Division 27 -	Communications, Structured Cabling, Data Communications, Voice Communications, Distributed Audio-Video Communications Systems.
Division 28 -	Electronic Safety and Security, Electronic Access Control and Intrusion Detection, Access Control, Intrusion Detection, Electronic Surveillance, Electronic Detection and Alarm, Fire Detection and Alarm.
Division 31 -	Earthwork, Site Clearing, Grading, Earthwork Methods, Soil Treatment.
Division 32 -	Exterior Improvements, Bases, Ballasts, and Paving, Flexible Paving, Asphalt Paving, Rigid Paving, Concrete Paving, Curbs, Gutters, Sidewalks, and Driveways, Fences and Gates, Planting Irrigation, Turf and Grasses.
Division 33 -	Utilities, Instrumentation and Control for Utilities, Water Utilities, Water Utility Distribution Piping, Water Utility Distribution Equipment, Disinfecting of Water Utility Distribution, Water Utility Storage Tanks, Sanitary Sewerage Utilities, Storm Drainage Utilities, Storm Utility Drainage Piping, Storm Utility Water Drains, Storm Drainage Structures, Electrical Utilities, Communications Utilities.
Division 44 -	Pollution and Waste Control Equipment, Common Work Results for Pollution and Waste Control Equipment, Air Pollution Control, Noise Pollution Control, Odor Control, Water Pollution Control Equipment, Solid Waste Control and Reuse, Waste Thermal Processing Equipment, Fluidized Bed Combustion Equipment, Rotary Kiln Incinerators, Pyrolysis Equipment, Hazardous Waste and Medical Waste Incinerators, Heat Recovery Equipment for Waste Thermal Processing, Synthesis Gas Cleanup and Handling Equipment.