Attachment J.22 Example BVM Survey Report.pdf

Building Ventilation Modification Site Survey Report

Location ID: SFK VOR Date: 04/14/2021 City, State Stonyfork, PA Surveyors: D. Williams

SITE SURVEY SUMMARY FINDINGS

This site is a 2nd generation Very High Frequency Omnidirectional Range (VOR) with Distance Measuring Equipment (DME). The SFK VOR has an existing battery string consisting of 18 KCT-660 single cell batteries (18 cells total). The batteries are rated at 660 amp-hours. The calculated maximum hydrogen evolution rate is 0.108 ft3/hr. at an equalized charge of 2.35 V per cell and a temperature of 90℉. The floor tiles and mastic are known to contain asbestos. The site is located in a relatively flat area. The area surrounding the site is gravel.

Panel board information is as follows:

o Panel board C o Federal Pacific Manufacturer (obsolete) o QO Load Center o Fused Disconnect at 60 amps o 120V 1 phase, 4 wire

SUMMARY PROJECT RECOMMENDATIONS

The building ventilation modifications include installing a new hydrogen monitoring system, exhaust fan, intake air damper, warning light, hand-off-auto switch, timer, bird screen, and insect screen. The hydrogen monitoring system will be designed to activate for 15 minutes once every 24 hours and provide one complete air change of the area occupied by the battery system. All exterior penetrations will be sealed watertight to maintain integrity of listed assembly. The new ventilation system is being installed to meet the latest edition of NFPA-1 requirements for battery room ventilation. The Hydrogen Monitoring System will operate according to the following:

1. HAND MODE

a. Manually activates the exhaust fan and intake damper.

2. AUTO MODE

a. An electrical timer will be set to activate an exhaust fan and actuated intake damper automatically for a minimum duration of 15 minutes every 24 hours.

b. When the H2 sensor senses the presence of hydrogen at 1% concentration per manufacturer recommendations, the signal will short the timer. This will override normal timer operation and initiate exhaust fan, intake damper and a warning light to implement ventilation.

The proposed equipment will require the installation of a new 20 AMP, single-pole breaker in the existing power panel (QO load center) and a new junction box for the hydrogen detector base unit. New conduit will be routed using new supports; existing supports will not be reused. All electrical work shall be performed in accordance with FAA-STD-1217H, all grounding shall be performed in accordance with FAA-STD-019F (or latest versions).

A new toggle switch will be installed in line of sight of the timer, H2 base unit, and hand-off auto switch. This disconnect switch will act as the disconnecting means for maintenance to the system as a whole (exhaust fan, intake damper, systems controls – H2 sensor, timer).

A summary of the hydrogen evolution and ventilation calculations as well as system safety factor calculations are shown below.

Battery Gassing Calculations

SFK VOR GASSING CALCULATIONS

TOTAL SQUARE FOOTAGE OF ROOM 483 FT2

HEIGHT OF ROOM 9.6 FT

TOTAL OF ROOM 4636.8 FT3

FAN CAPACITY 754 CFM

ASSUME %15 OF NON-OCCUPIED SPACE FOR EQUIPMENT AND

FURNITURE

ESTIMATED NON-OCCUPIED SPACE VOLUME (B5 @%85) 3941.28 FT3

HYDROGEN LOWER LIMIT (%1 BASED ON NFPA 1) 1%

ROOM CRITICAL VOLUME CV 39.4 FT3

N (NUMBER OF CELLS IN STRING) 18

K = AMOUNT OF HYDROGEN GAS, H2, RELEASED DURING

CHARGE, PROVIDED BY BATTERY MANUFACTURER 0.000269 FT3/MIN/CHARGING AMP AT 77℉

K (CORRECTED) 0.01614 FT3/HOUR/CHARGING AMP

C = CORRECTION FACTOR 90℉ TEMPERATURE 1.82

I=C*(FC/100)*AH (BATTERY RATING)

FC=0.031, BASED ON 2.35 V FLOATING VOLTAGE FOR

RECTANGULAR ACID BATTERIES

I 0.372 AMP

BATTERY RATING 660 AH

TOTAL HYDROGEN GAS RELEASE = H

H=N*I*K

H 0.108 FT3/HR

T=TIME TO REACH CRITICAL HYDROGEN CONCENTRATION

LEVELS

T=CV/H

T 15.2 DAYS

VENTILATION RATE REQUIRED TO DILUTE THE GAS, OA

REQUIRED

OA=H/(%1*60)

OA 0.180 CFM

L = LENGTH OF TIME GET ONE AIR EXCHANGE = TOTAL NET

ROOM VOLUME/FAN CAPACITY

L 5.23 MINUTES

RUN FAN ONCE A DAY FOR A MINIMUM 15 MINUTES OR AS

REQUIRED TO MAINTAIN ACCEPTABLE ENVIRONMENTAL

THRESHOLD

SAFETY FACTOR = SF = ACH VENT/ACH H2

ACH VENT = NUMBER OF CYCLES PER DAY/24

ACH VENT 0.04167

ACH H2 = H/CV

ACH H2 0.002745

SF(SAFETY FACTOR) 15

Task 1: Pre-Work Photo Survey Photographic Order

1.1 Photos of approximately where the battery unit is be mounted

1.2 Photos of all panels inside mechanical room

a. Panel faces

b. Inside panels

c. Panel schedules

1.3 Photos of Equipment room (each wall)

1.4 Photos of VOR exterior from 4 corners

1.5 Photo of existing Grounding Bars, if available

1.6 Photos of HVAC Equipment inside room (Nameplate & Location)

1.7 Photo of existing Dampers and Exhaust Fan (Nameplate & Location)

1.8 Updated layout of VOR (PDF, DWG, DGN)

Task 2: General Information

2.1 FAA Technician Name Nicholas Keim

2.2 FAA Technician Contact Info Nicholas.Keim@faa.gov

2.3 Site Address 41.695293 / -77.419868

2.4 Electrical Utility Provider First Energy

2.5 Electrical Utility POC 800-433-7794

2.6 Electrical Meter Number 5 001 158 200

2.7 Does the facility have Asbestos? Yes, tiles & mastic

2.8 Does the facility have Lead? Pains assumed to be lead based by SSC

Task 3: Exhaust Fan Installation

3.1 What is the wall construction where the fan will be

installed? Drywall / gyp board

3.2 What are the room dimensions? (LxWxH) See sketch for dimensions

3.3 Does the space have an existing HVAC unit? Yes

3.4 Does it maintain the temperature below 90°F Yes

3.5 What electrical panel will feed new exhaust fan and

timer? Are photos included?

Panel C – 4 holes available in

QO load center*

3.6 Is there an existing exhaust fan? No

3.7 If so, does it function? N/A

3.8 Is there an existing intake damper? No

3.9 If so, does it function? N/A

3.10 Is there an existing Timer, H2 Sensor, or Warning

Light? No

3.11 Will any of the above mentioned existing equipment

be reused?

N/A

3.12 Will other loads need to be relocated? No

3.13 If so, describe how this can be accomplished. N/A

3.14 Where does the SSC prefer the disconnecting means for

this ventilation system: a) Feeder Breaker, b) at the controls (H2 system), or, c) at the exhaust fan b) at the controls

3.15 Will equipment need to be relocated for the installation of the new equipment? No

Task 4: Battery Information

4.1 What is the string float voltage for the existing battery system? 2.25 Volts per cell

4.2 What is the battery type and model#? KCT-660

4.3 How many batteries are in the system? 18

4.4 How many cells in each battery? 1

Notes : *Obsolete Federal Pacific Electric (FPE) installed (Panel C & D)

Task 5: Existing Floor Plan Sketch

N.I.C

PANEL D

PANEL C

18 GNB-100A17

BATTERIES

A/C UNIT

’3

’9 27’8”8’4”

BUILDING FLOOR PLAN

NTS

NORTH

Task 6: Proposed Equipment Location Sketch

N.I.C N.I.C

N.I.C

PANEL D

PANEL C

18 GNB-100A17

BATTERIES

A/C UNIT

H2 SENSOR OVER

BATTERIES

NEW

EXHAUST FAN

NEW INTAKE

DAMPER

NEW HOOD

ABOVE INTAKE

DAMPER

WARNING

LIGHT

BUILDING FLOOR PLAN

NTS

SITE SURVEY PHOTOS

VOR (Located off airfield)

Panel C

Panel C Schedule Panel C

North Wall East Wall

South Wall West Wall

GNB Batteries

QO Load Center 60A Fused Disconnect

QO Load Center