ATTACHMENT 15 Architectural Narrative.pdf

ARCHITECTURAL NARRATIVE

VA Miami Healthcare System

VAMC Miami, FL

Construct a New Boiler Building and Controls in the Old Incinerator Area

Expand/Move Graphic Control

VA project number: 546-22-110

Project Scope:

Project scope includes construction of a new 2-story addition between Building 44 and the loading dock of the main hospital. No crawl space shall be required for this building.

This is the east side of Building 44 in the approximate location of the now demolished

Incinerator Building. Each story shall be approximately 5,000 square feet in area.

o First Floor: Floor level to align with the first floor of Building 44. This floor is below the flood plane elevation, so the entire area shall be designated as storage space. A connection between the existing building and new space shall be created. A covered connection to the adjacent main hospital building shall be created.

o Second Floor: Floor level will align with the second floor of Building 44. This level will house three boilers and all associated infrastructure. Due to required clearances above the boilers, the height of this space will align with the fourth floor of Building 44. A connection between the existing building and new space shall be created. A connection shall be created to the adjacent main hospital building. Design will include a new 508 square foot Control Room, with sight lines to all three new boilers and the existing Chiller Pump Room. The Control Room will have a Toilet and Break Area inside, so operators will have continuous access to the boiler monitors. The existing boilers and associated ancillary equipment shall be decommissioned and removed after the three new boilers are brought online. The resulting space shall be renovated, along with the existing Control

Room, to include the following support spaces:

▪ Storage Room

▪ Break Area in Control Room

▪ Women’s Locker Room

▪ Women’s Toilet Room

▪ Men’s Locker Room

▪ Renovated Men’s Toilet Room

▪ Housekeeping Closet

▪ Unisex Toilet Room in Control Room

▪ Electrical Closet o Equipment Mezzanine

▪ 14’-0” above Second Floor

▪ Contains boiler equipment and air handling equipment

The scope described above includes approximately 10,000 s.f. of new construction and

1,665 s.f. of renovations.

Site:

o The adjacent loading dock ramp shall be removed and replaced.

o A temporary modular ramp shall be used during construction.

o Bollards shall be added around the new addition to prevent trucks from damaging the building.

o New curb shall be installed 5’-0” from the new building to create a perimeter around the building that meets the PSRDM to not allow vehicles to park or drive within 5’-0” of the building.

o Storm drains will need to be re-routed o Backflow preventers and waterline shall be relocated.

o Existing electrical line shall be relocated.

o Temporary Boilers, Control Room, and related infrastructure to be located on

East side of existing B44, within blast wall.

Building exterior:

o Exterior design is anticipated to follow the design aesthetic of the adjacent

Building 44.

o Precast Concrete walls panels shall be used for the north and east sides. Stucco-covered concrete masonry units shall be used for the south wall that faces the main hospital.

o Clearstory windows shall be provided on the north and east elevations.

o Large removeable louvers shall be installed to allow for equipment replacement.

o Fans shall be located on the roof for intake and exhaust air. Parapet shall be 42” minimum above roof deck, so safety railings will not be required.

o Roof type shall be 3-ply built-up modified bituminous SBS roofing over 5/8” gypsum coverboard over tapered polyisocyanurate insulation.

o First floor level is not required to be flood-proofed.

o Existing chimney to be inspected and fixed/refurbished as noted in inspection report during construction.

Interior Design:

o The interior design for this project shall be utilitarian in nature. Exposed concrete and painted concrete masonry units shall be utilized throughout.

o New interior support spaces: Locker Rooms, Toilet Rooms, Office, Breakroom and

HAC closet shall be outfitted with typical finishes, Epoxy flooring, acoustic ceilings, and epoxy-painted walls.

o Control Room will have plastic laminate casework with solid surface counters.

o Break Room will have plastic laminate casework with solid surface counter.

o A stainless steel counter and sink along with metal base cabinets shall be in the

Boiler Plant to be used for water testing/treatment.

o Locker Rooms will have metal two-tiered lockers.

o Floors of the Mechanical spaces shall be treated with a waterproof resinous epoxy coating.

o Finishes shall be reviewed and selected in conjunction with VA Interior Design staff and shall be selected based on durability, maintenance, and aesthetics.

Vertical Circulation:

o One new stair tower shall be constructed within the footprint of the new addition.

One is needed to provide the required travel distance (400’) to a means of egress. The stair shall be located in the southeast corner of the addition and will discharge onto the loading dock level.

o New stair will extend to roof level to provide maintenance access to rooftop mechanical equipment.

o Existing freight elevator serving 4 floors of the existing utility building shall be completely refurbished, based on the recommendation of a third party review.

Report is attached.

Budget and Deduct Alternates:

o Project construction budget is established at $27,000,000.

o Deduct alternates totaling at least 20% of the construction budget shall be required. Target for deducts would be at least $3,700,000.00.

o Current deduct alternates options are:

o Removal of the refurbishment of the existing freight elevator.

o Removal of the stair access to the roof would allow us to remove 34 vertical feet of stairs (60 risers) and a rooftop penthouse. Rooftop access would be from the existing building side.

Building Phasing:

o The project shall be phased in the following sequence:

o Temporary Boilers and Control Room on West Side.

o Removal of existing temporary boiler on East Side, located in footprint of new building addition.

o Removal of existing boilers and associated infrastructure inside Building 44.

o Construction of new addition and renovation of existing spaces inside

Building 44.

Physical Security:

o The project is required to comply with Physical Security and Resiliency Design

Manual dated October 1, 2020. See the attached PSRDM matrix for information regarding compliance with physical security requirements.

Asbestos:

o A NESHAP Asbestos Survey has been conducted and the building does not contain asbestos. Building was constructed in 1996.

Life Safety Code:

o The life safety aspects of this project shall be designed according to NFPA 101, 2021 Edition. The Design Development drawings shall be reviewed by a third-party consultant for code compliance.

5755 Rio Vista Drive

Clearwater, FL 337-60-3137

T: 727-536-8772 www.pennoni.com

EXPANSION OF THE UTILITY PLANT BUILDING 44

1201 N.W. 16TH STREET, MIAMI, FL 33125

Pennoni Project No. RDCJP21006

January 27, 2023

Structural Narrative

Design Submittal (95%)

Building Codes and References

The following codes and standards are applicable to the structural design of the above captioned project.

Department of Veterans Affairs (VA)

• Physical Security Design Manual for VA Mission Critical Facilities

• Design Instructions to Architects and Engineers (February 1, 2014)

• Structural Design Manual for Energy Center Projects (February 1, 2014)

Unified Facilities Criteria (UFC)

• UFC 3-301-01 Structural Engineering (October 2019)

• UFC 4-023-03 Design of Buildings to Resist Progressive Collapse (November 2016)

American Society of Civil Engineers (ASCE)

• ASCE-7 (2016)

International Code Council (ICC)

• Florida Building Code 7th ed. (2020)

American Institute of Steel Construction (AISC)

• AISC 360, AISC Steel Construction Manual and Specification for Structural Steel Buildings

American Concrete Institute (ACI)

• ACI 318 (2014), Building Code Requirements for Structural Concrete

• ACI 301 (2016), Specifications for Structural Concrete

The Masonry Society (TMS)

• TMS 402 Building Code Requirements for Masonry Structures and TMS 602 Specification for

Masonry Structures

RDCJP21006 Page 2

Department of Veteran Affairs 95% Design Submittal

Design Criteria

The building structure will be designed to resist the following gravity and wind loads.

The following are the general design criteria from which other criteria are derived:

• Risk Category: IV

• Located in a High Velocity Hurricane Zone (HVHZ) as defined by the Florida Building Code.

• Located in a wind-borne debris region as defined by the Florida Building Code.

Design Gravity Loads

The dead loads for the utility plant building include the self-weight of the structural system and the weight of the building envelope supported by the structure.

The uniform dead and live Loads for the Structure include the following:

1 Per Table 1 in Structural Design Manual for Energy Center Projects (February 1, 2014).

The floors will be designed for a concentrated load of 2,000 lb placed upon any space 2.5 ft square wherever this load would cause stresses greater than those caused by the uniform live load.

Wind Design Criteria

The following wind design criteria will be used to calculate the wind loads on the Utility Plant Building’s Main

Wind Force Resisting System (MWFRS), the components and cladding pressures as well as the wind pressures included on this project. Wind pressures and forces will be calculated in accordance with ASCE 7 as amended by the Florida Building Code.

Parameter Value

Basic Wind Speed, 3 sec gust (V) 195 mph

Exposure C

Risk Category IV

Enclosure Classification Enclosed

Internal Pressure Coefficient (GPi) +/- 0.18

Area Live Load (psf) Superimposed Dead Load (psf)

Roof 30 25

Machine Rooms2 200 30

Catwalks/Service Platforms2 40

Ground Slab 150 30

RDCJP21006 Page 3

Materials

The material properties for the structure include the following:

Member Strength

Normal Weight Concrete Slab f’c = 4,000 psi at 28 days

Concrete Pile Caps & Grade Beams f’c = 4,000 psi at 28 days

Steel Reinforcing Bars ASTM A615 Gr 60

Welded Wire Fabric ASTM A1064

Masonry (CMU) f’m = 2,000 psi

Structural System

The project consists of a two-story new building connected to an existing building (building 44) that will serve as a utility plant. The building will have a footprint of approximately 5,000 sf. The structure will be composed of reinforced concrete structural framing with cast-in-place two ways floor slabs supported by beams in both directions.

The structural components for the proposed building are summarized below.

Main Wind Force Resisting System

The lateral Main Wind Force Resisting System (MWFRS) will be composed of a concrete slab acting as a diaphragm and reinforced concrete shear walls and concrete columns acting as the vertical MWFRS.

Foundation

The building will be supported on deep pile foundation 16” diameter auger-cast piles with a service load capacity of 130 tons downward, 87 tons uplift and 3.5 tons lateral, per geotechnical report recommendations.

Ground Floor Slab

The building ground floor slab will consist of a 10-inch thick, 4,000 psi normal weight two-way concrete structural slab supported on grade beams and pile caps. A 15-mil vapor retarder shall be provided below slab.

Floor and Roof Framing

The floor framing will consist of a 10-inch thick, 4,000 psi normal weight two-way concrete slab with 14 wide x 28” deep beams with approximate span of 22’. Columns will be square 22” & 26” cast-in-place.

Security and Anti-Terrorism

The utility plant supports buildings classified as “Mission Critical” per The Physical Security and Resiliency

Design Manual and is therefore classified as a Mission Critical structure. Therefore, the Mission Critical requirements in the VA Physical Security & Resiliency Design Manual Facilities are applicable.

RDCJP21006 Page 4

Flood Criteria

The utility plant building is located in a FEMA AE9 flood zone with a Base Flood Elevation (BFE) of 9.0 ft

(NGVD 29). This facility has a first-floor occupancy type of storage, placing the ground floor in Flood Design

Class 2 (Minimum Elevation to the top of the lowest floor = BFE + 1 ft).

Ground Floor Finished Floor Elevation = 9’-0” (NAVD88) = 10.55’ (NGVD29)

The finished floor elevation is higher than BFE + 1 ft. Therefore, flood proofing will not be required.

Construct a New Boiler Building and Controls in the Old Incinerator Area Expand/Move

Graphic Control

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024)

FIRE PROTECTION NARRATIVE - DIVISION 21

GENERAL

Each space in the new building expansion shall be protected by an automatic sprinkler system. Currently, there is an existing fire pump located in the existing CEP of Building 44, that is serving the CEP and adjacent buildings. A new fire main shall be extended from the existing fire main served by the fire pump to serve a standpipe in the new building expansion. A new floor control valve assembly and hose connection shall be located on each floor and located in the stairwell on the north-east corner of the building. In addition, a fire department connection (FDC) shall be located on the exterior of the building adjacent to the stairwell.

Quick response and standard response, pendant and upright sprinklers shall be utilized in the renovated and new areas. Quick response sprinklers shall be located in the restrooms, lockers, corridor, control room, and electrical closet. Standard response sprinkler shall be utilized in the remaining spaces. In addition, intermediate temperature rated sprinklers shall be utilized in the boiler room due to the radiant heat produced by the steam generation equipment. All renovated and new areas shall be classified as Ordinary

Hazard Group 2, as outlined in the VA specification section 21 13 13.

PLUMBING NARRATIVE - DIVISION 22

DOMESTIC COLD WATER

Currently, there are two backflow preventers located on the east side of Building 44.

Backflow preventer #1 serves as domestic cold water (3” main) for Building 44. Backflow preventer #2 serves as cooling tower makeup water only (4” main).

Figure 1: Existing Cold Water Backflow Preventers

Both backflow preventers are located where the new building shall butt up against

Building 44, and therefore shall be relocated.

The water service/new backflow preventers shall be located as shown below and water service lines shall be routed to connect where the existing water service enters Building

44. The new backflow preventers shall be installed prior to the removal of the existing backflow preventers to eliminate downtime. Bollards shall be installed around the backflow preventers to prevent damage from vehicles.

Figure 2: New & Existing Backflow Preventers

The existing boiler feedwater is supplied by a 2” connection near the freight elevator, where it passes through a duplex water softener by Chem-Aqua and then passes through a backflow preventer and a meter. These water softeners shall be removed, and new water softener and chemical treatment shall be provided. The existing cold-water piping, backflow preventer, and water meter shall be removed. New cold water shall be rerouted to the new boiler plant where it shall pass through two new backflow preventers mounted in parallel and a new water meter. The water shall then route through the new water softeners and new chemical treatment located on the east wall of the boiler plant.

In addition, domestic cold water shall be extended from the new cold-water main in

Building 44 to the renovated areas and new building to service the restrooms, break room, the emergency shower, boiler treatment sinks, and the janitor closet. New cold water shall also be reconnected to the cooling tower water treatment system on the first floor of existing Building 44.

Figure 3: Existing Water Softeners

DOMESTIC HOT WATER

A steam heated, semi-instantaneious water heater shall be located in HAC 20644 to serve the new restrooms, mop sink, emergency shower/eyewash station, and new sink in the boiler area. The water heater shall be capable of thermal eradication mode to comply with Directive 1061.

STORM AND CONDENSATE

Storm drainage shall consist of roof drains serving all flat roof areas, collected to a single pipe, and routed over to Building 44 to tie into the existing storm system. A piped rainwater overflow drainage system shall serve all flat roof areas and shall terminate above grade per the Florida Building Code. Roof drains shall be a combination primary drain and overflow drain consisting of two individual drains in one packaged set.

Combination primary and overflow drain with one drain and dual outlets is prohibited.

Figure 4: Existing Storm

All above ground piping shall be cast iron no-hub with heavy duty stainless steel couplings; piping shall be as vertical as possible to minimize conflicts with horizontal routing of ductwork. All cast iron piping shall conform to CISPI standards and bear the cast iron soil pipe institute markings. Offset risers as required to coordinate with fixture locations indicated on the architectural floor plan. All horizontal storm pipe shall be insulated.

All mechanical equipment condensate shall indirectly discharge into the storm system by use of floor drains.

SANITARY WASTE

Building 44 sanitary is partially served by a sewage ejection pump for the lower level and the above levels are gravity fed. All sanitary is routed over to Building 1 where it is then routed down to the pipe basement to tie into the existing sanitary main.

New sanitary piping and boiler blowoff piping located in the new building shall discharge to a pit located on the first floor. Two simplex sewage ejection pumps shallshall be provided to discharge the sanitary over to a sanitary main located in the pipe basement of Building

1. The new basin shall be concrete. The pumps motors shall sit on the top of the pit with extended shafts down into the pit.

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024)

All above ground sanitary piping shall be cast iron no-hub with heavy duty stainless steel couplings. All cast iron piping shall conform to CISPI standards and bear the cast iron soil pipe institute markings.

All pump discharge piping shall be type L copper with soldered joints. All copper pipe shall conform to ASME standards.

PLUMBING FIXTURES

Plumbing fixtures shall be high efficiency (low flow type) to achieve the maximum water savings appropriate for medical building, sustainable design.

• Men’s/Women’s Restrooms o Water closets for staff toilets rooms shall be vitreous china, manually operated dual-flush, 1.6/1.1 GPF.

o Lavatories shall be vitreous china, manually operated, 0.5 gpm o Showers shall be 1.5 gpm and included with a T/P combination thermostatic and pressure balancing valve, lever type operating handle, and wall mounted, detachable, chrome plates spray head o Floor drains are not anticipated for single-occupant restrooms

• Janitor Closet o Mop sinks shall be Terrazzo, composed of marble chips, with a 2.5 gpm pail hook threaded faucet

• Boiler Room o Emergency combination shower and eyewash station o Stainless steel sink station o Floor drains shall be located for any mechanical condensate and for water softener/chemical treatment indirect waste o Trench drains shall be located on multiple sides of the boilers

ADDITIONAL COORDINATION ITEMS

Chilled Water Chemical Treatment

Located adjacent to the existing boiler water softeners is the chilled water chemical treatment system. This area shall now serve as an access path from the freight elevator to the new boiler plant. Therefore, the equipment shall be relocated to the opposite wall, next to the existing emergency shower.

Figure 5: Chilled Water Chemical Treatment

Cooling Tower Drain Piping

For the cooling towers located on top of Building 44, there is a pipe tapped into the condenser water piping that serves to drain the cooling towers. This drain pipe penetrates the east wall and discharges to a storm drain. The current drain to storm is not code compliant, and therefore, the drain shallshall be rerouted to the new sewage pit on the opposite side of the wall.

Building 44 First Floor Sink

Currently, the sink located on the first floor on the east wall is discharging through the wall to grade. There is a pump located below the sink and piped to the sanitary system, but it is not working. The existing pump shallshall be replaced so that the sanitary waste can be disposed of to the existing sanitary system.

Figure 6: Existing Bldg. 44 Sink Discharge

Building 44 First Floor Ice Maker

Currently, the ice maker located on the first floor on the east wall is discharging through the wall to grade. This drain shall be rerouted to the sink sanitary pump mentioned above.

Figure 7: Existing Bldg. 44 Ice Maker Drain

Cooling Tower Chemical Treatment

The existing cooling tower chemical treatment is located on the first floor’s east wall of

Building 44. There is currently a drain penetrating the east wall and discharging to grade.

This drain shall be rerouted to the new sewage pit on the opposite side of the wall.

Figure 8: Cooling Tower Chemical Treatment Waste

Project Number: 546-22-11

MECHANICAL NARRATIVE – DIVISION 23

OVERVIEW AND DESIGN APPROACH

The objective of this project is to prepare contract documents for a complete renovation and upgrade to the steam generation and associated auxiliary systems located in the boiler plant, Building 44. This includes a new central boiler plant adjacent to Building 44 and the demolition of the existing steam generation and associated auxiliary equipment and piping. The new steam generation system shall include three (3) four-pass wetback

“Scotch Marine” firetube boilers, a deaerator, a condensate surge tank, condensate transfer pumps, boiler feedwater pumps with VFD’s, stack feedwater economizers, boiler stacks, a boiler blowdown separator, a continuous blowdown heat exchanger, a packaged fuel pump skid, a boiler SCADA system, a campus condensate recovery system, and boiler plant combustion air and heating systems. The boilers for this project shall be sole sourced CBLE-4W, integral type boilers, manufactured by Cleaver Brooks.

The construction also includes the installation of a new boiler control room, men’s and women’s locker rooms/restrooms, a corridor, and an electrical closet. New HVAC shall be provided for these support spaces.

Existing fuel oil storage and distribution system shall be modified such that the boiler plant is removed from the distribution system. New suction connections to the storage tanks 1-4 and a new packaged pumping skidshall be included to provide the necessary pressure to the boiler trains.

The Boiler Plant shall be designed in accordance with:

1. DVA Program Guide PG-18-15, Volume C.

2. DVA Steam, Heating Hot Water, and Outside Distribution Systems Design

Manual, (Steam Generating Systems), Volume I, August 1, 2021

3. DVA Steam, Heating Hot Water, and Outside Distribution Systems Design

Manual, (Steam Distribution Systems), Chapter 3, November 1, 2020

4. DVA HVAC Design Manual, Rev. March 1, 2022.

5. ASME Boiler & Pressure Vessel Code

6. ASME Section I – Power Boilers

7. ASME B31.1 – Power Piping

8. 2021 International Mechanical Code

9. VHA Boiler Plant Safety Device Testing Manual – 5th Edition

10. Physical Security and Resiliency Design Manual, Revised March 1, 2022

EXISTING CONDITIONS

Boilers

Currently, the Miami VA Medical Center is supplied steam by two (2) temporary 400 boiler horsepower (BHP) Johnston Boiler Company boilers located outdoors near the existing boiler plant, in the footprint of the new proposed 2-story boiler plant building addition.

Normally, steam is generated by two (2) 400 BHP Hurst fire-tube boilers, located in Building

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024)

44, but those boilers are currently offline for repairs. The existing steam generation system was manufactured in 2004 (20 years old). Previous to this system were similar steam boilers in the main hospital building (Building 1) and an incinerator on the footprint where the new boiler plant is planned, all of which are now demolished.

According to the VA Steam, Heating Hot Water, and Outside Distribution Systems Design

Manual, the expected useful life of fire-tube boilers and burners is 30 years. While it would be apparent the existing boilers have at least another 12 years of useful life, the existing boilers have suffered years of unsatisfactory maintenance and poor water quality which has prematurely aged the boilers, making replacement suggested.

In addition, VA boiler plants require N+1 redundancy utilizing a minimum of three (3) boilers. Currently, the boiler plant is equipped with two (2) boilers utilized to meet the building load. The current plant does not meet the standard of requiring a minimum of three (3) boilers, nor N+1 redundancy. The existing boiler plant also does not have adequate clearances around and above the boilers for proper maintenance. These factors contribute to the need of the new boiler plant.

Deaerator and Surge Tank

The Deaerator (DA) is located directly adjacent to the existing boilers, manufactured by

Buckeye Fabricating Company in 2013. The surge tank is located in the old (defunct) boiler plant in the main hospital building (Building 1) and was manufactured by Donlee

Technologies Inc. in 1995. The vertical multi-stage pumps for both the DA and Surge Tank appear to have been recently replaced.

Table 1 provides a summary of the existing boiler systems equipment.

Table 1: Existing Equipment

Equipment Manufacturer Year SN or

Model #

MAWP (PSI

at °F)

Remarks

Boiler 1 Hurst 2004 S200015055 150 400 BHP

Boiler 2 Hurst 2004 S200015055 150 400 BHP

Temp Boiler 1 Johnston Boiler Co. - - - 400 BHP

Temp Boiler 1 Johnston Boiler Co. - - - 400 BHP

DA Buckeye 2013 31297 50 at 380 22,000 lb/hr

Cond. Surge Buckeye 1995 7075 50 at 650

Induced Draft

Fans

Enervex/Exhausto 2012 IPVB685-15 13,000 CFM

(Qty. of 2)

Existing Steam Distribution Piping

The facility currently has three (3) High pressure steam (100 psig operating, 120 psig nominal) headers:

1. 6” header off the existing Hurst boilers in Building 44

2. 8” header which used to serve the demolished boilers in Building 1 old boiler plant

3. 10” header on the mezzanine in Building 1 old boiler plant

The steam supply from Building 44 passes between buildings to the 2nd header listed above in Building 1. This header then feeds header 3 up on the mezzanine. Header 2 currently has the steam silencer for boiler/burner testing and adjusting. The temporary boilers currently outside also feed header 3 up on the mezzanine.

From header 3, the steam is distributed through throughout the facility. Pressure reducing stations are used to drop the pressure to 50 psig, 30 psig, and 7 psig.

Existing Condensate Return System

Currently, the existing steam generation system is running off 100% makeup water and is not being returned to the boiler plant due to hardness in the condensate return water.

High hardness is likely due to failed heat exchanger(s) in the hospital and should be corrected before the new boiler plant is brought online. The steam condensate is being collected in a pit located in Building 1 but is being drained as waste and not returned to the boiler plant.

Figure 9: Existing Steam Condensate Pit

Existing Boiler Flue

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024)

The existing boiler flue combines into a single 30” diameter duct and is routed on the east exterior side of Building 44 to Building 1. This duct is then split into two (2) induced draft fans and then back into a single duct and tying into the existing chimney. The existing inside stack dimensions is approximately 29”x79” or 40”x40” according to existing plans.

Condenser Water

The cooling towers located on top of Building 44 have condenser water piping that is run vertically on the east exterior side of Building 44. Since the new building shall butt up against the east wall of Building 44, construction shall have to work around the condenser water piping. These systems must maintain operation 24/7.

Figure 10: Existing Boiler Flue & Condenser Water Piping

Fuel Oil

The existing fuel oil system consists of six (6) fuel oil tanks. The two larger tanks are where the fuel oil is received and stored, and these tanks distribute the fuel oil to the four (4) smaller tanks. The two (2) larger tanks (Tank #5 & #6) are presented at the bottom of

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024)

Figure 11 and the four (4) smaller tanks (Tank #1 thru #4) are presented at the top of

Figure 11. Fuel oil piping is distributed from Tank #1 thru #4 throughout Building 44 to equipment utilizing fuel oil (boilers and generators).

Figure 11: Fuel Oil Overview

Natural Gas

Natural gas enters the facility just inside the secure wall to the west of the Building 44 and

Building 1, where it is reduced to 5 psig and passes through a Roots Meter, rated for

23,000 CFH maximum. The gas main then runs below grade and up between Building 1 and Building 44 via a 4” SCH 40 pipe and plug valve. The gas main reduces to a 2” pipe that is then increased to a 3” and routed to the existing boilers. The pressure observed in

February 2022 was 4.568 psig inside the existing boiler plant per the pressure indicating transmitter (PIT) mounted on the pipe entering the boiler room.

Figure 12: Existing Natural Gas Piping

Currently, there are pressure issues when firing both boilers at full output when running on natural gas.

Propane Existing propane is served by two tanks located between Building 1 and Building 44 via a

1/2” pipe routed up to the second floor and to the existing boiler plant.

Figure 13: Existing Propane

HVAC

The existing boiler room on the second floor of Building 44 has large combustion air louvers and ventilation fans located on the north wall. In addition, there is an open intake louver located on the east wall. Located in the boiler room but serving the control room restroom and fire pump room is an inline exhaust fan with an exhaust louver located on the east wall. Adjacent to the boiler room where the chilled water and condenser water pumps are located, there is an intake louver located on the east wall that is ducted for outside air for the control room fan coil unit and for makeup air in the fire pump room. In addition, there are two (2) exhaust louvers and fans located on the east wall.

Building 1 Existing Refrigerant Detection System

The existing chiller plant is provided with a MSA ChillGuard 5000 gas monitor and several refrigerant sensors located on columns adjacent to the chillers. The existing monitor does not seem to be operating.

FACILITY HEATING LOAD ANALYSIS

Measured and Calculated Building Load

Below are tables of the existing boiler metered data from the 2013 logs obtained from the

VA and calculated loads according to the VA HVAC design manual.

Table 2: Existing Metered Data

Current Footage: 1,058,972 SF LB/HR BTUH BTUH / SF Notes

Boiler Metered Load (Min) 1,000 953,000 0.9 System Flow Meter

Boiler Metered Load (Max) 11,690 11,140,570 10.5 System Flow Meter

Boiler Metered Load (Avg

Min) 2,330 2,220,490 2.1 System Flow Meter

Boiler Metered Load (Avg

Max) 4,730 4,507,690 4.3 System Flow Meter

Table 3: Calculated Peak Building Load

Current Footage: 1,058,972 SF

Future Research

Lab: 30,000 SF

Total: 1,088,972 SF

LB/HR BTUH BTUH / SF Notes

Building + Reheat 16,473 16,472,618 15.1 Trane Trace 700 - Based on

VAHVACDM

Domestic Water

Heaters 1,574 1,500,022 1.4

Peak - Used metered data from other hospital facilities and did statistical analysis based on qty. of beds/operating rooms to forecast "Peak Load"

New SPS 1,369 1,304,657 1.2

Based on average

GPM/cycle per equipment manuals

Future Research Lab 750 714,750 0.7

10% Safety Factor 2,017 1,921,783 1.8

Totals 22,182 21,139,617 19.4

Load Analysis Conclusion

The calculated load is much higher than the metered load when comparing the two tables above. Therefore, a measured vs. calculated gas consumption graph (see below) was created to determine the accuracy of the metered data.

Figure 14: Gas Consumption Graph

Based on this graph, the measured gas consumption is less than the calculated consumption of a typical boiler operating at 75% efficiency. As seen in the graph, the existing boiler efficiency is averaged at about 60% and below. Therefore, the existing data is not completely accurate due to inaccurate measurements by the gas and steam flow meters or combustion efficiency issues resulting from burners that are out of range. In addition to the inaccuracies in measurements of the existing system, there are current facility issues that may be contributing to the low stream flow measurements as called out in the recent condensate study report performed May 2022. The report found the below issues:

• Various steam leaks

• Safety valve issues

• Pressure reducing stations not working

• Failed and flooded heat exchangers

• A large quantity of failed steam traps

Based on the measured vs. calculated values and the facility steam system issues, Above

Group recommends designing the new boiler plant per calculated load. This shall allow for heating requirements to be met as the facility undergoes renovations that shall be required to conform to the VA HVAC design manual.

Project Number: 546-22-11

Equipment Sizing

The new boilers shall be sized based on the calculated building load and the VA requirement of N+1 redundancy with a minimum of three (3) boilers. Based on the below calculation summary, 400 BHP boilers shall be utilized.

Table 4: Boiler Capacity

Feedwater Temp 227 °F

Enthalpy of Water 195 BTU/LB

Steam Operating

Pressure 120 PSIG

Enthalpy of Steam 1193 BTU/LB

Boiler Capacity 33475 BTUH/HP

Boiler Rating 400 HP

Nom. Boiler Cap. @

212°F 13800 PPH

Actual Boiler Cap. @

Pressure 13426 PPH

Qty. of Boilers Running 2

Total Capacity 26853 PPH

Table 5: System Flows

PPH GPM

Cond.

Return Rate Notes:

Softwater Required SWr

22,984 46 0%

Maximum Softwater

Demand

Returned

Condensate COND 25,213 52 100%

Maximum Condensate

Return

Steam to Deaerator

STEAM

4,674 --- 0%

Low Pressure Steam To

The Deaerator

Steam to Campus StC

25,213 --- 100%

Maximum Steam to

Campus

Feedwater FEED 27,658 58 0% Deaerator Discharge

After taking into account the steam required for the deaerator at the worst-case condition of 0% condensate return, 25,213 PPH of steam is available for the campus with two (2) boilers running. This value is greater than the calculated peak building load of

22,182 PPH; therefore, 400 BHP boilers are sufficient.

NEW BOILER PLANT OVERVIEW

The new boiler plant shall be located on the second floor of the new building since the first floor is considered a flood zone. All steam generation equipment shall be located on the second floor except for the blowdown separator, this shall be located on the first floor. The control room shall be located on the second floor within the new building.

Since the control room shall be used for both the boiler plant and the chiller plant, it shall contain viewing windows allowing visibility into the new boiler plant and into existing

Building 44 chiller plant. The existing boiler plant and control room in Building 44 shall be renovated to include new locker rooms, restrooms, a corridor, and an electrical closet. All existing boiler plant equipment shall be removed.

NEW STEAM GENERATION EQUIPMENT

Steam Boilers (Qty. of 3)

• Located on plant floor

• Four-pass wetback “Scotch Marine” firetube o 400 BHP o Natural Gas & Fuel Oil o 30 PPM NOx Burner Design o Igniter: Natural gas with propane backup

• Remotely mounted controller and FD fan VFD at each boiler with a single plant master panel.

o Controllers/panels shall be provided with panel mounted air conditioning units

• Design operating pressure: 90 psig

• Max. operating pressure: 120 psig

• Two (2) safety relief valves sized per the VA design manual

• Boiler Construction ASME stamped for 200 psig

• Base rail mounted air compressor

• Access platform on top of the boiler with service davit crane

• Automatic/Intermittent surface blowdown with conductivity sensor

Flue Gas Economizers (Qty. of 3)

• Three (3), boiler mounted, flue gas economizers

• Salon doors with accessibility from the boiler access platform

• Comply with ASME BPVC Section VIII.

• Tubes and Headers: ASTM A254, Type 316 Stainless steel. Helically wound non-serrated stainless-steel fins continuously welded to tubes. 2070 kPa (300 psig) flanged piping connections. Drainable by gravity. Return bend areas shall be exposed to the bulk temperature of the flue gas. Headers shall be external to the casing. Fin density shall not exceed 157 fins per meter (48 fins per foot).

Maximum fin height, 15 mm (1/2 inches).

• Boiler efficiency increase with economizers: 2.4%

Project Number: 546-22-11

• Simple payback: 2.2 years

Boiler Stack Height

• Based on a wind dispersion analysis of individual stacks provided for each boiler, the stack height must equal the existing chimney height when running on fuel oil to not interfere with outside air intakes and be within safe pollutant concentration values. See stack height technical analysis performed by TRC for additional information.

• After performing breeching calculations, boilers with individual stacks (at existing chimney height) have a higher backpressure versus utilizing the existing chimney.

Use of the existing chimney shall support proper burner operation whereas individual stack may require draft induction systems to maintain pressure. Reuse of the existing chimney is the design approach at this time.

• Above Group recommends removing the existing induced draft fans, tie all three

(3) new boilers into a single flue pipe, and tap into the existing chimney. This shall provide a positive stack effect with no backpressure on the boilers and shall not be visible from the exterior.

• The contract drawings shall require inspection and repair of the existing chimney interior surfaces. Once any surface repairs are completed the contractor shall install a thin, corrosion/acid resistant coating for protection. A stack drain shall be added to ensure any moisture is removed.

• Draft control shall be included with each boiler. This shall consist of Draft Dampers that are sufficient fast operating to maintain manufacturer draft pressure during all modes of operation. This shall prevent burner operational issues due to poor draft control.

Deaerator (Qty. of 1)

• Located on boiler plant mezzanine.

• Counter-flow, Tray type pressurized unit (5 PSIG) designed to heat and deaerator boiler feedwater by direct contact with low pressure steam.

• Feedwater storage capacity to the overflow line: sufficient for twenty minutes operation at maximum required feedwater output with no input water.

• Steam supply pressure at 90 PSIG (0.125 inch corrosion allowance) reduced to 5

PSIG through pressure reducing station also located on mezzanine.

• DA supply capacity is sized for (2) boilers in operation and (1) operating for testing.

• Capability to go to 100% make-up in case condensate return is not used due to present water hardness issues.

• (3) variable speed, vertical inline multi-stage pumps remotely mounted with a common header; one pump for each boiler.

o Located on plant floor.

Surge Tank (Qty. of 1)

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024)

• Located on plant floor

• Condensate surge tank shall be sized to accommodate surges without overflow. The tank shall be sized for 20 minutes minimum storage to overflow line at peak plant output requirements.

• (3) variable speed, vertical inline multi-stage pumps remotely mounted with a common header; one pump for each boiler.

o Located on plant floor.

Bottom Blowdown Separator (Qty. of 1)

• Located on first floor for ease of installation and not being a critical equipment component.

Boiler Blowdown Energy Recovery Unit (Qty. of 1)

• Located on plant floor.

• Utilized for continuous surface blowoff recovery.

• Max. makeup rate: (2) Boilers at 100% make-up.

• Blowdown rate: 20% of plant capacity.

• Vents to 5 PSIG steam system for use in the DA. Aux. bypass vent included when

DA is by-passed.

Ancillary Steam Equipment

• Steam Header Vent/Test Control Valve & Steam Exhaust Silencer, basis of design Pulsco BVS 18-2S.

o Located on boiler plant mezzanine.

o Vents through roof.

Fuel Oil Equipment

• Located on plant floor, adjacent to the new boilers.

• Duplex fuel oil pumping skid.

• Pumps to provide 100 PSIG fuel oil loop pressure to the burners.

• Modifications to the existing fuel oil tank connections to permit direct suction from each tank to be operator selectable and independent from the generator fuel delivery system. This modification shall change current plant operations and documents shall require training of operators on new SOP.

STEAM DISTRIBUTION SYSTEM

System distribution velocities shall be limited to 7,200 fpm per VA Design Manual; shallA new 12” steam header shall be located in the new boiler plant on the mezzanine level and a new 10” steam main shall be tapped off of the new header and routed over to the Building 1 mezzanine to the existing header. The existing Building 1 steam header

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024) shall be replaced due to its age and is identified in the phasing design on the drawings.shall

STEAM CONDENSATE SYSTEM

The existing condensate return equipment located in the Building 1 condensate pit shall be removed. shallshallA new low pressure condensate return vacuum unit and a new medium pressure and pumped condensate return unit shall be installed in place of the existing pressure power pumps and condensate storage tank. The existing campus pumped condensate and medium pressure condensate return lines shall be routed directly to the new tank. The existing campus low pressure condensate shall be routed to a condensate vacuum return unit that shall pump to the condensate surge tank located in the new plantshallshall.

FUEL

Natural Gas

A new 6” gas main shall be connected at the 4” gas company regulating station and routed underground to the exterior wall of Building 1. shallshallThe new 6” main shall be routed into the alley between buildings 1 and 44 and then into the new boiler plant. This line is dedicated to the boiler plant. The existing service in the alley shall remain for use by the VA for all other hospital needs. In addition. A branch with regulator and meter shall connect to the new 6” main, at the utility regulator, for temporary boiler service. Natural gas piping shall be Black steel, ASTM A53/A53M, Schedule 40 above ground and PE below ground.

Propane

The existing propane piping shall be removed back to the existing tanks and replaced with new piping. 3/4" piping shall be taken off of the existing tanks and combined to a new 1” propane main routed to the new boiler plant. All propane piping shall be Black steel, ASTM A53/A53M, Grade B, Schedule 40.

Fuel Oil

The existing day tank serving the existing boiler plant shall be removed and fuel oil supply, return, and overflow piping removed back to the first floor of Building 44. The existing fuel oil piping shall be extended to the new boiler plant to a new packaged pump skid to serve the boilers. All fuel oil piping shall be steel, seamless or electric resistance welded

(ERW), ASTM A53/A53M Grade B or ASTM A106/A106M Grade B, Schedule 40 with socket-welded connections.

BOILER PLANT HVAC

All air conditioning of spaces shall utilize CHW equipment. During the initial project design, the facility did not have enough chilled water capacity to support the new equipment and DX based equipment was selected. At the Final design submission, the

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024) facility indicated that they made system modification and repairs which made additional capacity available to the facility. The EOR has not verified this and was directed to use

CHW..

Air Conditioning

The Building 44 renovated areas (restrooms, lockers, and corridor) and the new boiler plant control room shall be conditioned utilizing CHW VAV unit with individual heating hot water VAV boxes. The Building 44 new electrical closet shall served by a D/X mini-split.

Boiler Plant Spot Cooling

The boiler plant shall be provided with spot cooling at the master panel, boiler control panels, boiler burners, boiler platform, and the chemical treatment area. Spot cooling shall be performed utilizing small, suspended CHW split dedicated outside air units. The chemical treatment area shall be served by one unit and the rest of the locations served by another single unit. The unit serving the master panel, boiler control panels, boiler burners, and boiler platform shall be equipped with motorized dampers that shall open and close upon operator’s preferred location of operation. These dampers shall be controlled at an operator interface panel located on an adjacent wall. Operation shall be timer controlled (30 min – 4 hours) and discharge air temperature shall be constant.

This shall prevent the unit from running unnecessarily when not in use.

CHW System Modifications

The existing chiller plant secondary system will be modified with an additional set of secondary pumps installed in parallel to the other six (6) sets of secondary pumps. The secondary system to the Boiler Plant will be dedicated and will have redundant pumps.

CHW system capacity requirements is anticipated to be approximately 50 Tons of cooling. Existing chiller conditions are scheduled as having a leaving water temperature of 44 Deg F and a return water temperature of 56 Deg F. The Miami VA clarified that the chillers provide 42 Deg F with a 10 Deg F differential. This is based on a more recent study of the plant capacity. The boiler plant will be selected at a 12 Deg F differential with 42

Deg F as the supply water temperature. This will facilitate being able to maintain the reported 10 Deg F differential at the chiller.

The secondary pumps shall be located in the existing chilled water plant and will be downstream of the existing decoupler. A differential pressure sensor will be added to the chiller plant controls in parallel to the other 6 sensors. No Sequence of Operations changes are anticipated to accomplish this. A by-pass line will be installed on the boiler plant secondary, with a lockable valve, so that the contractor can isolate the system from the main chilled water for testing and start-up during construction, and the facility may use it in the future for similar tasks.

Combustion Air

Combustion air shall be met with a single large louver opening located on the north side wall of the boiler plant. The louvers that shall make up this opening shall be located within

12” of the finished floor and 12” of the bottom of roof structure. The louvers shall be sized

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024) to have a minimum free area of 1 sq. in. per 2,000 BTUH input rating with boilers operating at full capacity. The louvers shall also act as equipment access upon removal.

Ventilation and Exhaust

Locker Room/Restroom Exhaust:

A single inline exhaust fan shall be ducted to each of the restrooms and locker rooms.

Discharge shall be at a new louvered wall in place of the existing boiler plant combustion air louver.

Building 1 Chiller Plant Ventilation and Exhaust:

Two (2) inline exhaust fans shall be ducted to sidewall exhaust grilles for chiller plant ventilation. Airflow rate shall match the existing ventilation rate. Chiller refrigerant purge exhaust shall be served by a single inline fan ducted over to two (2) columns adjacent to each chiller within 12” of the finished floor. Exhaust discharge shall be at the new louver wall mentioned above.

Fire Pump Room Ventilation:

A single inline exhaust fan shall be ducted to the fire pump room. Transfer air grilles shall be provided for makeup air. Exhaust discharge shall be at the new louver wall mentioned above.

Control Room/Break Room and Restroom Exhaust:

The break room located within the new control room and the control room restroom shall be served by a roof mounted, downblast, high wind, NOA rated exhaust fan on the boiler plant roof.

New Boiler Plant Ventilation:

A single roof mounted makeup air unit equipped with N-1 redundant supply fans shall supply the boiler plant with raw outside air. The supply air shall be ducted down to the plant mezzanine floor and the plant boiler floor. Three (3) hooded propeller type exhaust fans shall be mounted on the roof with a ductless inlet for exhaust. One (1) of the three (3) fans shall be fully redundant and only two (2) shall operate at a time. All roof equipment shall be high wind NOA rated. Airflow shall be designed for to maintain a maximum of

104°F in the boiler plant or 12 air changes, whichever is greater. The calculated heat gain for the boiler plant is 259 MBH which equates to 26,650 CFM with an entering air temperature of 95°F and a leaving air temperature of 104°F. 12 air changes equate to

28,900 CFM. Therefore, the plant shall be designed for 30,000 CFM which meets the calculated load and the minimum 12 air changes per hour.

Hazardous Gas Detection System

Carbon monoxide (CO) and combustible methane (CH4) sensors are required to be distributed about the boiler plant. Given the size of the boiler plant, four (4) CO and combustible methane (CH4) sensors are required. In addition, a CO sensor is required to be located within the control room. CO sensors shall be mounted at 4’-0” to 6’-0” above

Project Number: 546-22-11

MEPFPT 100% Design (Rev. 04/22/2024) finished floor and CH4 sensors shall be located within 6”-10” of bottom of roof structure.

The boiler plant, control room, and adjacent area shall have local visual and audible alarms. A central alarm control panel shall be located within the control room.

Monitoring of this panel shall be through the HVAC control system.

Refrigerant Detection System

The existing chiller plant refrigerant gas monitor shall be services, recalibrated, and commissioned for operational use. New refrigerant sensors shall be used and piped back to the monitor. The new refrigerant purge exhaust fan mentioned above shall be interlocked with the gas monitor.

TEMPORARY BOILER PLAN

The current temporary boilers are located where the new boiler plant is being constructed and are using the existing deaerator/make-up water system.