S06 Appendices Final 7-21-2020.pdf

April 30, 2020 Central Western Massachusetts Healthcare System

VA Project No. 631-451 Liberty Building - Upgrade Primary Care

APPENDIX A - COVER

APPENDIX A

MECHANICAL / ELECTRICAL / FIRE PROTECTION

DESIGN NARRATIVE

Mechanical / Electrical / Fire Protection Design Narrative

Prepared For:

VA Medical Center

Building 1 Primary Care

Northampton, MA

February 28, 2020

F&T Project No. 180540.01

Prepared By:

Fitzemeyer & Tocci Associates, Inc.

300 Unicorn Park Drive, 5th Floor

Woburn, MA 01810

781.481.0210 | 781.481.0203

1. Project Description

1.1. General

2. Mechanical / Electrical Systems Executive Summary

2.1. Fire Protection

2.2. Plumbing

2.3. HVAC

2.4. Electrical

3. Fire Protection Systems

3.1. System Description

3.2. Materials

3.3. Proposed Manufacturers

4. Plumbing Systems

4.1. Potable Water Systems

4.2. Storm Drainage System

4.3. Sanitary Drainage and Vent Systems

4.4. Special Drainage and Vent Systems

4.5. Medical Gas and Vacuum Systems

4.6. Natural Gas Systems

4.7. Plumbing Fixtures

4.8. Materials

4.9. Proposed Manufacturers

5. HVAC Systems

5.1. Heating

5.2. Steam Systems

5.3. Primary Cooling

5.4. Air Handling

5.5. Supply Air Distribution System

5.6. Return Air Systems

5.7. Zoning

5.8. General Exhaust Air Systems

5.9. Automatic Temperature Controls

5.10. Materials

5.11. Proposed Manufacturers

6. Electrical Systems

6.1. General

6.2. Electrical Service – Normal

6.3. Electrical Service – Emergency

6.4. Wiring Methods

6.5. Lighting

6.6. Fire Alarm System

6.7. Low Voltage Systems

6.8. Proposed Manufacturers

6.9. Alternates / Options

1. Project Description

1.1. General

The project consists of the renovation of, and addition to, the first floor of Building #1 at the Veterans Administration Medical Center in Northampton, MA. The renovation area is approximately 25,500 square feet, and is intended to consist of urgent and primary care exam, treatment, waiting, and supporting areas. The addition area is approximately 4,300 square feet and is intended to consist of urgent care exam, treatment, waiting, and supporting areas. The addition areas will be provided with a pipe-basement that will be unfinished and of minimal height, with the intent to provide access for utilities below the first floor additions. The urgent care areas of the building will continue to operate on a 7 day / week, 24 hour / day schedule with no proposed changes to the current occupied / under-occupied periods. The primary care areas of the building will continue to operate on a 5 day / week, 9 hour / day schedule with no proposed changes to the current occupied / under-occupied periods

The renovation will be completed in several different phases to accommodate the relocation of departments / areas as the corresponding new space is completed.

2. Mechanical / Electrical Systems Executive Summary

2.1. Fire Protection

Northampton VA, Building #1 is currently fully sprinklered and the proposed renovation space, infill, and addition shall be fully sprinklered. The existing fire protection system shall be re-configured throughout the renovated space utilizing the existing floor control valves and wet sprinkler risers. All existing sprinklers and piping in the renovation space shall be demolished and replaced with new piping to accommodate the proposed architectural layout and allow for coordination with new mechanical and electrical systems. The existing building fire protection water service, fire pump, and wet pipe sprinkler risers are adequate and shall continue to support the sprinkler system in the renovation, infill, and addition areas. Modifications will be required to the existing fire pump test header and an existing 2” drain riser outlet due to the infill. Coverage throughout the building shall be designed to fully comply with VA Guidelines and NFPA 13.

2.2. Plumbing

Existing plumbing systems are adequate to support the proposed renovation of Northampton VA, Building #1, and associated infill addition. The existing piping, from mains to the fixtures, will be demolished in the renovated area and new piping extended throughout the renovation and infill spaces for all systems, including the following:

• Domestic water supply and circulation

• Sanitary drainage and venting

Proposed design work will fully comply with the requirements of federal, state, local codes, and VA requirements.

2.3. HVAC

The scope of the HVAC work for the addition, infill and renovations areas include a combination of new heating, ventilation and air-conditioning equipment and systems, existing equipment and system modifications and selective removal of existing HVAC equipment, ductwork, piping and accessories.

The existing and new systems are intended to be supported from existing campus primary heating (steam) infrastructure and existing Building 1 primary cooling (chilled water via chiller plant) infrastructure.

2.4. Electrical

The scope of electrical work includes new normal and emergency power distribution, branch circuitry for power and lighting, lighting, fire alarm, and low voltage equipment, cable, and raceway systems for the proposed renovation and addition areas. The existing normal and emergency branch power distribution for the renovated portions of the building shall be demolished. All new branch power distribution systems (normal and emergency) shall be extended from the existing main switchboard systems located on the lower level of the building. The existing emergency generation and major distribution gear shall support new feeder services to new separated emergency branch distribution and panel boards. New lighting systems shall be provided throughout the renovated and addition spaces. These systems shall be designed as energy efficient LED, with local switching and automatic relay control; enclosed spaces with intermittent occupancy shall be also be provided with occupancy sensing controls. New fire alarm devices shall be provided throughout and be supported from the existing fire alarm system. Raceway, cabling and equipment support shall be provided for low voltage systems, including nurse call, security, door access, cable TV, patient monitoring, and telephone & data infrastructure systems.

Systems throughout the proposed building shall be designed to comply with current VA, Facility Guideline Institute guidelines, and the National Electric Code.

3. Fire Protection Systems

3.1. System Description

Building #1 is currently provided with a full coverage wet pipe sprinkler system. The incoming fire protection water service is supplemented by a 40HP vertical in-line electric fire pump, located in the basement. Downstream of the fire pump, the Building #1 wet pipe fire protection system is served by wet system risers in each of the stairwells with floor control valves located at each floor. Per the VA Fire Protection Design Manual, the sprinkler system is zoned to align with the smoke zoning scheme of the building.

The proposed renovation space is located in four (4) separate sprinkler zones. Each wet pipe sprinkler zone is supplied by a wet pipe sprinkler riser and floor control assembly, each located in the stairwell adjacent to the space. Fire department valves are also located on each of the riser; however, per signage throughout the site, the valves are for sprinkler maintenance only and the system is not considered a combination sprinkler / standpipe system.

Fire protection scope includes the demolition of all sprinklers and sprinkler piping within the renovation space. The existing fire protection system to be demolished consists of wet fire protection mains, branch piping, and runouts supporting recessed pendent, horizontal sidewall, and vertical sidewall sprinklers. All sprinkler piping, including sprinkler mains, will be demolished and removed due to the age of the system (approximately 40 years old) and for coordination with updated mechanical, electrical, and plumbing systems required to support the renovation. Wet pipe sprinkler risers in the stairwells shall be existing to remain, with the exception of the drain outlet in the stairwell adjacent to the existing loading dock. This 2” drain outlet will require relocation due to the infill. The fire pump test header and adjacent drain shall be relocated to accommodate the proposed infill. Fire department connections and post indicator valves for the building’s fire protection systems are located in ambulance bay. The ambulance bay is outside of the scope of the proposed renovation.

Therefore, the existing post indicator valves and fire department connections will remain as is.

All spaces shall have sprinkler protection in accordance with the VA Fire Protection Design Manual (7th Edition). New sprinklers, cross mains, branch piping, and armovers will be provided for the entire renovation, infill, and addition. Sprinkler zoning shall align with the smoke compartmentalization scheme of the building, as required by the VA Fire Protection Design Manual. The infill and addition will be served by one of the existing sprinkler zones and the existing associated floor control assembly, with the assumption that they will be part of an existing smoke compartment. Sprinkler spacing and design discharge densities shall be based on the 2016 Edition of NFPA 13 requirements for light hazard and ordinary hazard occupancies in accordance with the VA Fire Protection Design Manual. FM-approved ordinary temperature quick response sprinklers shall be used throughout the space, except where standard response or increased temperature sprinklers are required by either NFPA 13 or the VA Fire Protection Design Manual. No concealed sprinklers are currently FM-approved as quick response; therefore, recessed pendent sprinklers shall be provided throughout the renovation space in areas with finished ceilings. In areas with unfinished ceilings, upright sprinklers with protective guards shall be provided.

Working drawings will be provided by the Fire Protection Subcontractor showing all sprinklers and piping, with drawings stamped by a registered professional engineer and forwarded to the VA and to the local fire department for approval. The fire protection system shall be hydraulically designed, furnished and installed by the fire protection subcontractor.

3.2. Materials

1. Wet pipe sprinkler piping, NPS 2 and smaller:

a. Schedule 40, black-steel pipe with threaded ends; uncoated, gray-iron threaded fittings; and threaded joints; or

b. Schedule 40, black-steel pipe with plain ends; steel welding fittings; and welded joints.

2. Wet pipe sprinkler piping, NPS 2-1/2 (DN50) and larger:

a. Schedule 10 black-steel pipe with roll-grooved ends; uncoated, grooved-end fittings for steel piping; grooved-end-pipe couplings for steel piping; and grooved joints.

3. Flexible head drops rated for a minimum of 300 psig are permissible.

3.3. Proposed Manufacturers

Sprinklers: Viking, Tyco, Reliable or approved equal

Piping: Allied, Wheatland, Central or approved equal

4. Plumbing Systems

4.1. Potable Water Systems

The existing potable hot and cold water supply and recirculation hot water systems from the existing building risers will be extended, reconfigured, and connected to all new plumbing fixtures and pieces of equipment requiring hot and/or cold water throughout the renovated spaces. Addition area systems shall be all new and extend and connect to major distribution mains/risers in the existing facility.

Isolation valves shall be installed at all branch take-offs. Piping shall be sized based on fixture units and velocity within the pipe. Water velocity within cold water piping shall not exceed 8 feet per second and hot water shall not exceed 5 feet per second. The domestic water system shall be designed to flow at a pressure of 20-80 psi based on the International Plumbing Code. The minimum pipe sizes listed for plumbing equipment below shall be used where fixture unit sizing dictates a smaller pipe size. All potable water systems shall comply with all applicable low lead requirements.

Water heating for the renovated and addition spaces shall be provided from by the existing facility steam fired domestic water heaters, located in the lower level of the building. The existing heaters are anticipated to have adequate capacity for the proposed new renovation and additional hot water loads. Adequacy based on reduced faucet flow rates, small net faucet increase, use group remaining similar and domestic water heaters being tank-less steam fired type capable of adjusting to demand as needed. Tempered water supply through a local thermostatic mixing valve(s) will be provided to support all the safety equipment throughout the renovated and addition spaces. All thermostatic mixing valves shall be installed mounted under each sink with a battery powered local check valve.

Hot water recirculation piping will be routed for a maximum time delay of 5 seconds from the point of use. No dead legs are allowed.

Water make-up to HVAC systems (humidifiers, hydronic piping) and other potential contaminant locations (hose bibs) shall be provided with backflow preventers.

Pipe insulation shall be provided for the water systems throughout the building. Insulation shall be 1” thick for all domestic cold water systems. Insulation thickness shall comply with current VA Guidelines and national energy codes, or be 1”, whichever is the more stringent requirement, for all domestic hot water systems.

Water valves shall be full port, ball type, solder ends.

4.2. Storm Drainage System

The existing storm drainage system passing through the renovated areas will be modified to accommodate new ductwork and architectural configurations. Existing storm drain leaders in walls to be demolished will be offset to new walls or pipe chases and reconnected to existing storm drainage system above basement level ceiling. Existing storm drain leaders in walls shall be existing to remain.

The new additions shall be provided with a new storm drainage system for the addition square footage and square footage from sloped roofing draining to the addition areas. Storm drainage shall consist of primary and overflow roof drains, and drainage piping systems. The primary and overflow storm drainage systems shall combine into a 6” cast iron pipes and are anticipated to extend and connect to existing site drainage services. Primary pipe sizing is based on the new renovation square footage, Massachusetts rainfall rates and horizontal pipe slope of 1/8” per 1’.

Storm drainage system piping shall be insulated with 1” thick insulation. Insulation shall cover the entire storm drainage system, including the vertical piping.

4.3. Sanitary Drainage and Vent Systems

The existing sanitary drainage and vent system throughout the renovated areas will be reconfigured to accommodate new plumbing fixtures and equipment layouts. All plumbing fixtures and pieces of equipment requiring sanitary waste and vent connections shall be provided with connections to the sanitary drainage and vent system. The sanitary drainage work will extend and connect to existing building sanitary stacks above the basement level ceiling. New fixture vents will be extended and connected to the existing vent stacks above the Level 1 ceiling. No dead legs are to remain after demolition.

Addition area sanitary drainage and venting work shall be new work. Sanitary drainage piping shall extend to existing drainage mains and stacks in the basement level ceiling. Sanitary vent piping shall extend to one new 4” vent through roof for each additional area.

The new sanitary branch lines serving bathroom groups shall be minimum 4” diameter below grade and will connect to the existing main sanitary waste lines. The branch lines shall have cleanouts located as required by the International Plumbing Code and VA, whichever is more stringent.

Cleanouts shall at a minimum be located every 50 feet and at the end of all branch run outs. New sanitary branch lines serving only a single counter sink shall be minimum 2” diameter and connect, when combining more than 3 sinks into a sanitary branch line of 3” diameter.

Sanitary vent piping above the ceiling shall be minimum 2” diameter regardless of fixture units being vented. Venting sizes shall increase to 3” after combining bathroom groups with other vent piping. All venting for the renovated and new space shall combine and rise through the roof as a 4” vent through the new roof.

Floor drains receiving condensate shall have a funnel to collect the condensate and discharge into the sanitary sewer system.

4.4. Special Drainage and Vent Systems

No requirement for special drainage and venting is anticipated.

4.5. Medical Gas and Vacuum Systems

No requirement medical gas or vacuum is anticipated.

4.6. Natural Gas Systems

There is no anticipated work for the natural gas system.

4.7. Plumbing Fixtures

Provide all new plumbing fixtures, trim, and accessories complete with all necessary piping connections. Implement fixture types and operators consistent with VA and existing hospital standards. Furnish new eyewash devices at soiled utility rooms.

Install low-flow vitreous china, floor mount, back-outlet type water closets with manual dual push handle flush valves rated for 1.1/1.6 GPF for public and private restrooms. Equip water closets with 1- 1/2” connection to cold water piping, 4” sanitary drainage connection and 2” sanitary vent connection.

Each water closet contributes 10 drainage fixture units and each supply contributes 10 supply fixture units. Fixture units are based on the International Plumbing Code.

Install floor mount ADA bariatric white powder coated stainless steel water closets rated for 1000 pounds or more with manual dual push handle flush valves rated for 1.1/1.6 GPF for bariatric restrooms. Equip water closets with 1-1/2” connection to cold water piping, 4” sanitary drainage connection and 2” sanitary vent connection. Each water closet contributes 10 drainage fixture units and each supply contributes 10 supply fixture units. Fixture units are based on the International Plumbing Code.

Install stainless steel floor mount, back outlet, back spud ADA anti-ligature water closet with push button wall mount operated flush valve for mental health department bathrooms. Equip water closets with 1-1/2” connection to cold water piping, 4” sanitary drainage connection and 2” sanitary vent connection. Each water closet contributes 10 drainage fixture units and each supply contributes 10 supply fixture units. Fixture units are based on the International Plumbing Code.

Provide wall-hung vitreous china lavatories in public restrooms. Equip lavatories with offset traps (when necessary), drain insulation kits and under sink battery thermostatic mixing valves. Fasten lavatories with 1/2” connections to cold and hot water piping at 0.5 gpm, 2” drainage connection and 1-1/2” vent connection. Each lavatory contributes 1 drainage fixture unit. Each hot water and cold water supply adds 0.5 supply fixture units with a total of 1 supply fixture unit for both combined at the water supply entrance. Fixture units are based on the International Plumbing Code.

Install ADA floor mount bariatric lavatories able to withstand 1000 pounds of downward force. Fasten lavatories with 1/2” connections to cold and hot water piping at 0.5 gpm, 2” drainage connection and 1-1/2” vent connection. Provide battery thermostatic mixing valve under sink. Each lavatory contributes 1 drainage fixture unit. Each hot water and cold water supply adds 1.5 supply fixture units with a total of 2 supply fixture units for both combined at the water supply entrance. Fixture units are based on the International Plumbing Code.

Install stainless steel counter mount insert sinks with offset traps (when necessary) and drain insulation kits (for exposed traps). Provide counter mount sinks with 1/2” connections to cold and hot water piping, 2” drainage connection and 1-1/2” vent connection. Provide battery thermostatic mixing valve under sink. Each counter sink adds 2 drainage fixture units. Each hot water and cold water supply adds 2 supply fixture units with a total of 2 supply fixture units for both combined at the water supply entrance. Fixture units are based on the International Plumbing Code.

Exam room sinks shall be integral to the counter with offset traps (when necessary) and drain insulation kits (for exposed traps). Provide sinks with 1/2” connections to cold and hot water piping for battery operated sensor faucets with 2” drainage connection and 1-1/2” vent connection. Provide battery thermostatic mixing valve under sink. Each counter sink adds 2 drainage fixture units. Each hot water and cold water supply adds 2 supply fixture units with a total of 2 supply fixture units for both combined at the water supply entrance. Fixture units are based on the International Plumbing Code.

Equip lavatory sinks with goose-necks and manual wrist-blade type operators that supply 0.5 GPM.

Provide battery operated sensor faucets to exam sinks that supply 1.5 GPM to the sink with a laminar flow.

Construct mop basins with rim guard and manufactured by Fiat or Approved Equal. Install wall mounted faucets with hose end connections and backflow prevention devices. Provided mop basins with 1/2” connections to cold and hot water piping, 3” drainage connection and 2” vent connection.

Each mop basin adds 3 drainage fixture units. Each hot water and cold water supply adds 2.25 supply fixture units with a total of 3 supply fixture units for both combined at the water supply entrance. Fixture units are based on the International Plumbing Code.

Provide all floor drains with ½” coated automatic trap primers. Install floor drains with 1/2” cold water connection to the floor drain trap, 2” to 4” drainage connection depending on the use and location and 1-1/2” to 2” vent connection depending on the drainage pipe size. Drainage fixture units are based on the discharge into the floor drain. There are no supply fixture units for this piece of equipment.

Fixture units are based on the International Plumbing Code.

Install eyewash equipment with deck-mount, dual spray element, draw out hose style. Eyewash equipment shall be provided with 1/2” connections to cold and hot water piping. Drainage and supply fixture units are not included in usage calculations for this equipment. Fixture units are based on the International Plumbing Code.

Provide full surround type ADA shower with Symmons Safety Mix ADA head systems (or approved equal) that include a single water temperature control lever with integral pressure and temperature regulator, standard and wand-connected heads, and diverter valve assembly. Install showers with 1/2” connections to cold and hot water piping, 3” drainage connection on grade, 1-1/2” vent connection and integral center drain. Provide 2.5 gpm non-aerating shower heads for all showers.

Each shower contributes 2 drainage fixture units. Each hot water and cold water supply contributes 3 supply fixture units with a total of 4 supply fixture units for both combined at the water supply entrance. Fixture units are based on the International Plumbing Code. Floor drain to be provided outside of shower in bathroom.

4.8. Materials

Provide type L hard drawn copper domestic water piping with soldered fittings and valves. PEX is not allowed.

Provide hubless cast iron, service weight pipe for sanitary waste and vent piping 2-1/2” and larger above grade piping, and hub and spigot 80 lb for below grade piping. Provide type L copper with soldered fittings for piping 2” or less for above grade; cast iron hub and spigot for below grade. PVC is not allowed.

Storm drainage piping:

• Above grade: Service weight hub-less cast iron pipe and fittings with approved four-band (minimum) type, heavy duty, clamp/gasket mechanical joints. PVC is not allowed.

• Below grade: Service weight hub and spigot cast iron pipe and fittings with rubber seals. PVC is not allowed.

4.9. Proposed Manufacturers

Toilets: Kohler Approved Equal

Flush Valves: Sloan or Approved Equal

Sinks: Just MFG, Elkay, Opella, or Approved Equal

Faucets: Chicago, Sloan, Toto, Grohe, or Approved Equal

Eyewash: Guardian, Haws, Speakman, or Approved Equal

Floor Drains: JR Smith, Wade, Mifab, or Approved Equal

Roof Drains: Froet, JR Smith, Wade, or Approved Equal

Valves: Apollo, Watts, Nibco, or Approved Equal

Backflow Preventers: Apollo, Watts, Febco, or Approved Equal

Showers: Freedom Showers, Aquatic, Aqua Bath, Aquarius, or Approved Equal

5. HVAC Systems

5.1. Heating

Primary heating for the building is currently provided by high-pressure steam generated at the existing campus heating plant. Refer to “Steam Systems” section below for further information.

The existing VAV terminal reheat coils in the 1977 addition renovation space and the Southwest core wing renovation space are currently supported by existing heating hot water distribution systems.

These spaces will continue to be supported by the existing heating hot water via the reconfiguration and extension of these systems

Hot water for hydronic heating shall be generated by new low-pressure steam-to-hot water heat exchanger equipment. Heating hot water shall be distributed by new inline pumping equipment, via new piping risers and mains serving the addition, infill and southwest core wing renovation spaces.

All heating hot water infrastructure shall be located in the second floor infill mechanical room.

Additional secondary heating system details include:

1. One (1) new shell-and-tube style steam-to-hot water heat exchanger rated for approximately 300 MBH. The heat exchanger shall have capacity to support the entire addition, infill and Northwest core wing renovation spaces.

2. Two (2) new vertical inline centrifugal heating hot water pumps rated for approximately 60 GPM (estimated 20° ΔT) at 60’ total dynamic head, fitted with 3 HP motors and integral variable speed drives. Each pump shall have capacity to support the entire addition space.

3. New hot water piping distribution serving new VAV terminal box reheat coils. It’s anticipated that the new piping mains from the new heat exchanger up to the first floor will be 2”.

4. All new variable air volume terminal boxes shall be provided with hot water re-heat coils.

5. System shall be provided with all hydronic accessories required for operation.

All heating system equipment and controls shall be on emergency power. The system shall be designed to have 15% extra capacity to support future renovations.

5.2. Steam Systems

Existing high pressure steam service to the building is reduced to medium and low pressure via existing pressure reduction stations located in the Building 1 basement mechanical rooms. Steam supports hydronic heating hot water (via existing steam to hot water heat exchangers), air handler ventilation preheat and air handler humidification requirements. Existing steam services shall be extended and modified to provide service to the new air handler ventilation air preheat and humidification requirements.

New 4” low pressure steam supply piping, via an existing pressure reduction station located in a basement mechanical room, shall originate from the basement level and extend up to above the first floor ceiling and backfeed the existing 3” low pressure steam line serving the existing attic mechanical room. A new 3” branch shall be extended to the second floor infill mechanical room and shall serve the air handling heating and steam to hot water heat exchanger.

A new 2” low pressure condensate piping main will combine condensate piping from the new infill air handler and heat exchanger and tie into an existing 2” condensate line in the first floor ceiling. The anticipated low pressure steam and condensate line sizes for service to the new second floor infill air handler (for preheat and humidification) are 2-1/2” and 1-1/4”, respectively. The anticipated low pressure steam and condensate line sizes for service to the new heat exchanger (for hot water generation) are 2-1/2” and 1-1/4”, respectively.

Existing low pressure steam services shall be reconfigured to support the new Northwest core wing indoor air handler ventilation air preheat and humidification requirements. The anticipated low pressure steam and condensate line sizes for service to this new indoor air handler (for preheat and humidification) are 1-1/2” and 1-1/4”, respectively. This work shall be priced as a deduct alternate.

As part of the demolition scope, all steam re-heat coils, steam radiators and associated low pressure piping (to the maximum extent possible) shall be removed.

No steam distribution work for service to process equipment (sterilizers, autoclaves, etc.) is anticipated for the project.

5.3. Primary Cooling

Primary cooling at the building is currently provided by chilled water generated at the existing chilled water plant. Existing chilled water at Building 1 is piped to the three existing air handlers that currently support the proposed renovation spaces. The existing chilled water system will continue to support the existing air handlers serving the 1977 addition and Southwest core wing renovation spaces. The existing piping serving the Northwest core wing area will be reconfigured to support the new air handler cooling requirements.

Primary cooling for the addition and infill areas shall be provided by cool air delivered to the space via new rooftop air handling equipment and ductwork distribution systems. Chilled water coil(s) in the new air handlers shall be served via the existing chilled water system in the building. New 2-1/2” chilled water supply/return piping mains shall extend from the existing 6” piping mains in the attic to the new second floor mechanical room air handler serving the infill space. All chilled water piping exterior to building shall be heat traced to prevent freezing.

• New attic southwest core wing renovation attic air handling unit: Approximately 14 tons (33 GPM), delivered at 44 deg. F and returned at 54 deg. F.

• New infill second floor mechanical room air handling unit: Approximately 26 tons (63 GPM), delivered at 44 deg. F and returned at 54 deg. F.

• New Northwest core wing renovation indoor air handling unit: Approximately 8 tons (18 GPM), delivered at 44 deg. F and returned at 54 deg. F.

Space cooling for the new IT room in the main building renovation space will be supported by two (2) 1.5-ton split system air conditioning units. Associated air cooled condensing units will be located on grade.

Space cooling for the existing IT room in the 1977 addition renovation space will be supported by two

(2) 1.5-ton split system air conditioning units for redundancy. Associated air cooled condensing units will be located on grade.

Space cooling for the existing morgue shall be provided by two new 1 ton split system air conditioning units sharing a common 2 ton condenser. The associated air cooled condensing unit shall be located on the addition roof. The existing condensing unit serving the morgue cooler shall be relocated on to the addition roof.

5.4. Air Handling

Proposed 1977 Addition Renovation Spaces

Cooling, ventilation, and ventilation air pre-heating to support the 1977 addition renovation areas will continue to be supported by the existing 20,000 cfm semi-custom indoor air handler located in the attic. The unit was installed in 2013 as is in excellent condition.

Renovation Space (Southwest Core Wing)

Cooling, ventilation and ventilation air pre-heating to support the southwest core wing will be provided by a new modular indoor air handler. The air handler will be installed in the existing attic mechanical room. The air handler shall be a hospital grade, semi-custom style indoor type unit designed for extended life expectancy.

The proposed replacement attic air handler shall have the following characteristics. The design intent is for the air handler to support the part of southwest core wing and addition area.

1. Semi-custom unit.

2. 4,000 CFM supply airflow at an estimated 2.5” external static pressure.

3. 4,000 CFM return airflow at an estimated 1.5” external static pressure.

4. Variable air volume operation.

5. Approximately 33 percent outside air.

6. Double-wall, 2” insulated foam panel construction, with thermal breaks.

7. Stainless steel drain pans and coil racks.

8. Factory wired interior and exterior services lights and receptacles.

9. Premium efficiency motors.

10. Variable frequency drives for control of all fans.

11. Access doors and windows in all sections.

12. Air flow measuring stations (supply, return, and outside air).

13. Filter bank differential pressure gauges.

14. (1) Plenum supply and (1) plenum return fans; direct-drive, airfoil centrifugal type.

15. Ultra low leakage dampers.

16. Internal air blender (to blend return and outside air efficiently).

17. Supply and return smoke detectors (duct mounted).

18. 30% efficient cartridge style pre-filters.

19. 90-95% efficient cartridge style final filters.

20. Low pressure steam grid humidifier. Estimated 43 lbs/hr steam capacity.

21. Hydronic heating coil (re-heat position). Estimated 148 MBH total capacity

22. Hydronic chilled water cooling coils; estimated 162 MBH total capacity

23. Discharge Plenum.

24. Air handler and controls shall be on emergency power

Proposed Addition and Infill Spaces

Cooling, ventilation and ventilation air pre-heating to support the addition and infill areas will be provided by a new modular indoor air handler located in the second floor infill mechanical room. The air handler will be installed in the infill attic mechanical room. The air handler shall be a hospital grade, semi-custom style indoor type unit designed for extended life expectancy.

The proposed new indoor air handler shall have the following characteristics. The design intent is for this air handler to serve the infill space and to support a portion of the southwest core wing renovation space which is currently under supplied.

1. Semi-custom unit.

2. 9,000 CFM supply airflow at an estimated 3” external static pressure.

3. 9,000 CFM return airflow at an estimated 2” external static pressure.

4. Variable air volume operation.

5. Approximately 33 percent outside air.

6. Double-wall, 2” insulated foam panel construction, with thermal breaks.

7. Stainless steel drain pans and coil racks.

8. Factory wired interior and exterior services lights and receptacles.

9. Premium efficiency motors.

10. Variable frequency drives for control of all fans.

11. Access doors and windows in all sections.

12. Air flow measuring stations (supply, return, and outside air).

13. Filter bank differential pressure gauges.

14. (1) Plenum supply and (1) plenum return fans; direct-drive, airfoil centrifugal type.

15. Ultra low leakage dampers.

16. Internal air blender (to blend return and outside air efficiently).

17. Supply and return smoke detectors (duct mounted).

18. 30% efficient cartridge style pre-filters.

19. 90-95% efficient cartridge style final filters.

20. Low pressure steam grid humidifier. Estimated 160 lbs/hr steam capacity.

21. Low pressure steam heating coil (pre-heat position). Estimated 355 lbs/hr steam capacity.

22. Hydronic chilled water cooling coils; estimated 316 MBH total capacity, 246 MBH sensible capacity.

23. Discharge Plenum.

24. Air handler and controls shall be on emergency power

Renovation Space (Northwest Core Wing)

Cooling, ventilation, ventilation air pre-heating to support the Northwest core wing renovation area will be provided by a new indoor air handler located in Mechanical Room 1306. The design intent is for building to support the Northwest core wing renovation area only. The air handler shall be a hospital grade, fully custom style indoor type unit designed for extended life expectancy. This air handler and all associated work shall be priced as a deduct alternate.

The proposed air handler shall have the following characteristics.

1. Custom unit.

2. 2,250 CFM supply airflow at an estimated 2” external static pressure.

3. 2,250 CFM return airflow at an estimated 1” external static pressure.

4. Constant air volume operation.

5. Approximately 33 percent outside air.

6. Double-wall, 2” insulated foam panel construction, with thermal breaks.

7. Stainless steel drain pans and coil racks.

8. Factory wired interior and exterior services lights and receptacles.

9. Premium efficiency motors.

10. Variable frequency drives for control of all fans.

11. Access doors and windows in all sections.

12. Air flow measuring stations (supply, return, and outside air).

13. Filter bank differential pressure gauges

14. (1) Plenum supply and (1) plenum return fans; direct-drive, airfoil centrifugal type.

15. Ultra low leakage dampers.

16. Internal air blender (to blend return and outside air efficiently).

17. Supply and return smoke detectors (duct mounted).

18. 30% efficient cartridge style pre-filters

19. 90-95% efficient cartridge style final filters

20. Low pressure steam grid humidifier. Estimated 39 lbs/hr steam capacity.

21. Low pressure steam heating coil (pre-heat position). Estimated 83 lbs/hr steam capacity.

22. Hydronic chilled water cooling coils; estimated 91 MBH total capacity, 65 MBH sensible capacity.

23. Discharge Plenum

24. Air handler and controls shall be on emergency power

5.5. Supply Air Distribution System

Major supply ductwork mains to the renovation space (from the existing handlers serving the renovation space) are intended to be cleaned, reused, and reconfigured where appropriate; major supply mains within the renovation space will be reused to maximum extent practical. A combination of new and existing VAV terminal boxes will serve the renovation areas. The existing VAV boxes will be reconfigured and/or upgraded to meet the airflow requirements for the renovation spaces. New VAV terminal boxes will be installed in the Northwest Core Wing to support this renovation space.

A new fully ducted supply air system will be provided to support the addition and infill areas. The system will originate at the rooftop air handling unit and extend to the new VAV terminal boxes via medium pressure ductwork. The system will then extend from the VAV terminal boxes to the ceiling supply diffusers via low pressure ductwork.

The ductwork will be galvanized steel and insulated with 1-1/2” thick fiberglass duct insulation.

Hospital-grade sound attenuators shall be provided in the main supply and return ductwork for each new air handler system.

New supply air ductwork shall generally be galvanized steel and insulated with 1 1/2” thick fiberglass duct insulation. Medium pressure supply air ductwork between the air handling units and the VAV terminal boxes shall be rated for 6” wg pressure class service. Supply air ductwork downstream of VAV terminal boxes (low pressure) shall be rated for 2” wg service.

Pressure independent Variable Air Volume (VAV) terminal boxes with hot water reheat coils will be provided for air flow, space pressure and temperature control. All VAV boxes will be single inlet type with hospital grade lining and factory provided sound attenuators. Areas with existing VAV boxes and/or hydronic re-heat coils (renovation areas only) shall be cleaned and reused where practical.

VAV terminal boxes serving non-patient care areas such as offices, corridors, lounges and staff areas shall operate in variable volume fashion with airflow modulating in response to the thermal load within the space. Minimum air flow rate will be defined as the minimum flow required to comply with VA Guideline and Building code minimum ventilation air flow.

VAV boxes supporting Patient General Care areas will operate in a variable volume fashion, with minimum delivery rate set as required by VA guidelines. The following are applicable minimum air exchange and ventilation rate requirements for the typical project spaces with VA Guideline criteria:

Space Name Min. Total ACH Min. Vent. ACH Pressurization

Treatment Room 6 2 Neutral

Triage 12 2 Negative

Exam Room 6 2 Neutral

Waiting Room 6 2 Neutral

Soiled Utility/Workroom 10 2 Negative

Clean Workroom 4 2 Positive

Clean Storage 4 2 Positive

Toilet Room 10 NA Negative

Housekeeping 10 NA Negative

Mechanical 6 2 Neutral

Storage/Closet NA NA Neutral

Server 2 NA N/A

Office 4 2 Neutral

Reception Area 4 2 Neutral

Conference 4 2 Neutral

Corridor 4 2 Positive

Space pressure relationships will be maintained by balancing in all areas. Isolation room spaces shall be provided with space pressure indicator monitors.

In most non-patient care and general patient care areas the ceiling diffusers will be 2’x2’ and will lay-in the acoustic tile ceiling grid. Common spaces such as lobbies, waiting areas, and corridors may have specialized diffusers/grilles to meet the requirements of the architectural ceiling construction.

Pre-construction airflow and static pressure measurements shall be obtained for the two existing to remain air handlers serving the renovation spaces. This scope includes measuring all supply diffusers connected to the air handlers, even on floors that are not in the renovation scope (i.e.

basement, first and second floors served by the existing 20,000 cfm air handler AHU-1) located in the attic space. The basement and second floor supply diffusers will be rebalanced back to the flows obtained during the pre-construction measurement process.

5.6. Return Air Systems

Major return ductwork mains to the renovation space (from the existing handlers serving the renovation space) are intended to be cleaned, reused, and reconfigured where appropriate; major return mains within the renovation space will be reused to maximum extent practical. New insulated low pressure galvanized steel branch/run-out ductwork and ceiling return grilles shall be provided.

A new fully ducted return air system will be provided to support the addition and infill areas. The system will originate at the new rooftop air handers and extend to new ceiling return grilles via insulated low pressure galvanized steel ductwork.

The return ductwork system shall be constructed to 3” wg. pressure class service. The ductwork will be galvanized steel and insulated with 1-1/2” thick fiberglass duct insulation.

Pre-construction airflow and static pressure measurements shall be obtained for the two existing to remain air handlers serving the renovation spaces. This scope includes measuring all return grilles connected to the air handlers, even on floors that are not in the renovation scope (i.e. basement, first and second floors served by the existing 20,000 cfm air handler AHU-1) located in the attic space.

The basement and second floor return grilles will be rebalanced back to the flows obtained during the pre-construction measurement process.

5.7. Zoning

Temperature Control Zoning: Each zone will have a separate VAV box based on the following criteria:

1. Interior and exterior spaces will be zoned separately.

2. Exterior spaces with multiple exposures will be zoned separately.

3. Interior spaces: No more than 1600 SF per VAV box.

4. Offices will be zoned separately from Patient Care areas.

5. Private Offices: No more than 3 private offices will be zoned together.

6. Patient General Care: No more than 4 like rooms will be zoned together.

Areas will be zoned by department. Spaces in different departments will not be zoned together.

5.8. General Exhaust Air Systems

Exhaust for the basement mechanical room xxx shall be reconfigured to accommodate the new loading dock. A new exhaust louver shall be installed within the loading dock structure and ductwork shall be extended back to the existing mechanical room. The existing exhaust fan shall be replaced with a new wall mounted propeller fan. Makeup air shall be provided by a relief duct terminating in a gooseneck at the loading dock overhang. Exhaust fan shall be a 0.5 HP wall mounted propeller type.

The new exhaust fan shall operate on the same sequence as the previously removed fan.

The existing facility toilet exhaust air systems (including exhaust ductwork and attic exhaust fans) will be upgraded and reconfigured in the renovation areas. New utility set centrifugal style exhaust fans will be located on the addition and infill roofs and will support the exhaust requirements for all toilet rooms, soiled utility rooms, janitor’s closets, locker rooms and all other areas as required by VA guidelines. The exhaust systems shall be a low velocity un-insulated galvanized sheet metal duct system serving ceiling mounted exhaust grilles. The exhaust systems shall originate at the new ceiling mounted exhaust grilles and extend to the fans via low velocity un-insulated galvanized sheetmetal ductwork.

Pre-construction airflow and static pressure measurements shall be obtained for all existing exhaust fans serving the renovation spaces. This scope includes measuring all exhaust grilles connected to the exhaust fans, even on floors that are not in the renovation scope (i.e. basement and second floors). The basement and second floor exhaust grilles will be rebalanced back to the flows obtained during the pre-construction measurement process.

5.9. Automatic Temperature Controls

All renovation and addition / infill area control systems shall be by extension / upgrade of the existing facility direct digital control (DDC) building automation systems (JCI). The control system will provide the primary function of temperature control throughout the renovation space. In addition, it will allow for system problems to be identified, alarms, scheduling, and troubleshooting from a terminal located in building 1, and a remote access point located in building 12.

The existing air handler supporting the proposed Southwest core wing renovation space is currently supported via pneumatic controls. The controls for this air handler and its associated systems shall be upgraded to DDC.

5.10.

5.10. Materials

Hot Water Piping:

1. Piping 3” and smaller: Type L copper, soldered fittings, threaded bronze valves. Press fittings shall be considered with alternate pricing.

2. Pipe size 2-1/2” and larger: Black steel pipe; schedule 40; wrought steel buttweld fittings;

welded joints. Press fittings shall be considered with alternate pricing.

Steam Piping:

1. Steam supply piping operating at 0 to 15 PSI shall be schedule 40 welded for 2-1/2” and larger and schedule 40 threaded for 2” and less. Low pressure steam condensate piping shall be schedule 80 welded for 2-1/2” and larger, threaded for 2” and less.

2. Steam supply piping operating at greater than15 to 100 PSI shall be schedule 80 welded for 2-1/2” and larger and schedule 40 threaded for 2” and less. Medium pressure steam condensate piping shall be schedule 80 welded for 2-1/2” and larger, threaded for 2” and less.

Pipe Insulation:

1. All hot water supply/return, condensate drain and steam piping will be insulated with fiberglass pipe insulation with kraft vapor barrier ASTM C457 and ASTM C795; thicknesses shall be consistent with current Massachusetts energy code regulations.

2. All refrigerant piping shall be insulated with rubber flexible elastomeric insulation; closed-cell material; complies with ASTM C 534.

Ductwork:

1. ASTM A525 galvanized steel sheet, lock forming quality, zinc coating of 1.25 oz. per sq. ft. for each side in conformance with ASTM A90.

2. ASTM A167 316 Stainless steel sheet, 22 gauge annealed finish.

3. Fabricated in accordance with SMACNA pressure class 6 duct standards for medium-pressure supply and class 2 for low-pressure supply systems.

4. Outdoor ductwork shall be coated with manufacturer approved material for UV protection.

Ductwork Insulation:

1. All insulated supply/return ductwork and exhaust ductwork (within 10 feet of exterior opening) systems within building will be provided with 1-1/2 inch thick flexible fiberglass blanket insulation ASTM C553.

2. All insulated supply/return/exhaust ductwork systems outside building will be provided with 2 inch thick rigid cellular plastic, non-combustible blanket insulation ASTM C591 and wrapped with weatherproof “cladding” system (VentureClad or equal).

Diffusers and grilles:

1. Aluminum construction.

Identification:

1. Piping shall be labeled per ASME A13.1, "Scheme for the Identification of Piping Systems," for letter size, colors, length of color field and viewing angles of identification devices for piping.

2. Ductwork shall be labeled with plastic duct tape markers.

3. Equipment shall be labeled with engraved plastic laminated equipment placards.

5.11. Proposed Manufacturers

1. Air Handling Units (Semi-Custom) Trane, York, Carrier, Approved Equal

2. Air Handling Units (Custom) Trane, York, Carrier, Approved Equal

3. VAV Terminal Boxes: Titus, Envirotec, Price, Approved Equal

4. Fans: Greenheck, Cook, Penn Ventilator, Approved Equal

5. Shell and Tube Heat Exchanger Bell and Gossett, Taco, Amtrol, Approved Equal

6. Pumps Bell and Gossett, Taco, Armstrong, Approved Equal

7. Ductless Split System Mitsubishi, Sanyo, Approved Equal

8. Diffusers/Grilles: Titus, Price, Approved Equal

9. Room Pressure Controllers: Siemens, TSI Presura, Approved Equal

10. Controls: JCI, Siemens, Honeywell, Approved Equal

6. Electrical Systems

6.1. General

The electrical scope consists of complete new normal emergency power, branch circuits, lighting, fire alarm, and low-voltage system raceway throughout the project scope.

Normal power, emergency power, and fire alarm shall be provided by extension of the existing Building 1 systems. The existing infrastructure, branch circuit wiring, and devices within the project renovation area will be removed in their entirety. This includes system wiring and components associated with the project scope that are outside the area of renovation. For the equipment outside of the work area, the branch circuits will need to be re-fed from the new equipment and potentially maintained during construction.

Selective demolition (such as entry ramp, conduits, electrical/mechanical devices in the alley way of the infill addition) is required at the exterior required as a part of the project scope.

The building electrical system shall be in compliance with NEC 2014, national building regulations and standards, and VA TIL and Northampton design standards. The systems will also be designed to FGI Guidelines for Design and Construction of Healthcare Facilities.

This project requires a short circuit, coordination & arc flash hazard study…