Committee of the Whole/Documents/Fire Flow Calculation - based on 2020 Fire Underwriters Survey - #339 Island Highway - North Building
Appendix
Fire Flow Calculation - based on 2020 Fire Underwriters Survey - #339 Island Highway - North Building
June 13, 2023Page 1401 section
Technical document calculating the required fire flow for the proposed North Building at 339 Island Highway based on construction type and floor area.
Address: 339 Island Highway - North BuildingTotal Effective Floor Area: 5050 sq.mRequired Fire Flow: 383.3 L/sDate: 2023-02-23
Fire Flow Calculation - based on 2020 Fire Underwriters Survey
McElhanney Proj.# 2241-22-149 #339 Island Highway - North Building
Construction Coefficient (C) (see guide pg 20 & 21)
| C= | Construction Type |
|---|---|
| 1.5 | for Type V Wood Frame Construction |
| 0.8 | for Type IV-A Mass Timber Construction |
| 0.9 | for Type IV-B Mass Timber Construction |
| 1.0 | for Type IV-C Mass Timber Construction |
| 1.5 | for Type IV-D Mass Timber Construction |
| 1.0 | for Type III Ordinary Construction (Joisted Masonry) |
| 0.8 | for Type II Noncombustible Construction |
| 0.6 | for Type I Fire Resistive Construction |
| 1.5 | Type IV-C |
Total Effective Floor Area (A) (see guide pg 22&23)
A = 5050 sq.m (53955 sq.ft = 5013 sq.m)
Required Fire Flow (RFF)
F = 220C(A^1/2)
- F = 23451 L/min
- F = 23000 L/min (Rounded to nearest 1000)
- F = 383.3 L/s
Occupancy and Contents Adjustment Factor (see Table 3 in guide pg 25&26)
| % | Contents Description |
|---|---|
| -25 | Noncombustible Contents |
| -15 | Limited Combustible Contents |
| 0 | Combustible Contents |
| 15 | Free Burning Contents |
| 25 | Rapid Burning Contents |
| -15 | Residential Occupancies, Limited (Description of Major Occupancy and Contents) |
- Amount of Fire-Flow reduction (Occupancy): F = -57.5 L/s
- Estimated Reduced Fire-Flow (Occupancy): F = 325.8 L/s
Automatic Sprinkler Protection (see guide pg 27)
| Sprinkler Credits | Automatic Sprinkler System Design |
|---|---|
| -30% | design and installed to NFPA 13 |
| -10% | water supply stnd for system and FDC Hoses |
| -10% | Fully supervised system |
| -25% | Community Level Automatic Sprinkler (see guide pg 28) |
| -50% |
- Amount of Fire-Flow reduction (Sprinkler): F = -162.9 L/s
Exposure Adjustment Charge (see guide pg 30)
| # of sides | Separation | Charge % |
|---|---|---|
| 0 | 0 - 3 m | 0 |
| 0 | 3.1 - 10 m | 0 |
| 0 | 10.1 - 20 m | 0 |
| 0 | 20.1 - 30 m | 0 |
| 4 | > 30 m | 0 |
| 4 | 0% (75% max) |
- Notes: North to #340 IslHwy (36m), East to #347 IslHwy (32m), South to South Building (17m [auto sprinkler]), West to East Building (13m [auto sprinkler])
- See Table 6 for exposure adjustment charges for subject building considering construction type of expose building face
- Exposure Separation charge: F = 0.0 L/s
Estimated Fire-Flow (with reductions & charges)
F = 162.9 L/s
TOTAL FUS FIRE-FLOW COVERAGE REQUIRED
F = 162.9 L/s (9775.0 L/min)
2023-02-23 22-149 FUS 2/23/2023
Page 140
Extracted from: 2023 06 13 Committee of the Whole Agenda - Agenda - Pdf