Scribd
Upload
5K views2 pages

Stair Pressurization Calculation

This document provides details needed to calculate the required pressurization of a building staircase. It includes the building height, whether sprinklers are provided, stairwell dimensions, number of doors and their sizes, and leakage ratios for walls, floors, and ceilings. Calculations are shown to determine the total leakage area and airflow through gaps and doors. The required relief airflow and size of the relief damper are then calculated based on the total airflow needed to maintain positive pressurization of the stairwell.

Uploaded by

naruto256
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
5K views2 pages

Stair Pressurization Calculation

This document provides details needed to calculate the required pressurization of a building staircase. It includes the building height, whether sprinklers are provided, stairwell dimensions, number of doors and their sizes, and leakage ratios for walls, floors, and ceilings. Calculations are shown to determine the total leakage area and airflow through gaps and doors. The required relief airflow and size of the relief damper are then calculated based on the total airflow needed to maintain positive pressurization of the stairwell.

Uploaded by

naruto256
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

STAIRCASE PRESSURIZATION CALCULATION

BUILDING DETAILS Required Data


Building Height from Lowest Level of Fire Service Access Excluding Roof
1.0
Parapet meters
2.0 Type of Building
3.0 Is Provision of Staircase Press. System Mandatory
Yes
4.0 Is Sprinkler System provided for Fire Protection Yes

STAIRWELL DETAILS
1.0 Length of Stairwell meter
2.0 Width of Stairwell meter
3.0 Total Height of Stairwell (including Basement where Applicable) meter
4.0 No. of Levels in Stairwell (including Basement where Applicable)
5.0 Ceiling Height meter
6.0 Pressure Difference Between Staircase & Adjacent Space Pa.
7.0 Average Leakage Ratio for Walls (NFPA 92, Table A.4.4.4.3) 1.10E-04
8.0 Average Leakage Ratio for Floor/Ceiling (NFPA 92, Table A.4.4.4.3) 5.20E-05

STAIRWELL DOOR DETAILS


1.0 Number of Stairwell Door Per Floor
Door No: A1 A2 A3
Qty. of Doors
Door Size Width (m)
Door Size Height (m)
No. of Door Leaves
Total Door Opening Force (N)
Door Closer Force (N)
2.0 Door Arrangement (Series or Parallel) Parallel
3.0 Average Gap Between Door Leaf and Door Frame mm
4.0 Select 3 Doors Likely to be opened during Evacuation
Exit Door -1 (indicate Door No.)
Exit Door- 2 (indicate Door No.)
Exit Door -3 (indicate Door No.)
5.0 Distance of door knob to knob side of the door (d) m

CALCULATIONS English Unit Conversion

1.0 Leakage area of gaps in Stairwell Walls, Ceiling & Floor 0.000 sq. m. - Sq. feet
2.0 Leakage area of gaps around doors 0.000 sq. m. - Sq. feet
3.0 Total Leakage Area (A) of gaps in Building Construction and Doors 0.000 sq. m. - Sq. feet
4.0 Airflow Through Gaps in Building Construction & Doors (Q1)

Q1 & Q2 = kf x A x (△P)^(0.5) 0.000 Cu.m/sec) - CFM

Where: Q1&Q2 = Flowrate (cu.m/sec)


Kf =Coefficient, 0.827
A = Total Leakage Area (Wall,Floor,Ceiling & Doors/Window), Sq.m.
△P = Pressure Differential between staircase & adjacent area, Pascal (Pa)

1/2 Stair Pressurization Calculation- Final.xlsx -07/04/23-5:17 AM Prepared by Dr. Reynaldo B. Castillo, PME
STAIRCASE PRESSURIZATION CALCULATION

5.0 Effective Area of 3- Doors Open 0.00 sq. m. - Sq.Ft.

6.0 Airflow Through 3-Nos Open Doors (Q2)

Q2 = A x v 0.00 Cu.m/sec) - CFM


where: Q2 = Flowrate (cu.m/sec)
A = Total Effective Area (3-Doors), sq.m.
v = Maximum Velocity, 1.02 m/sec. (NFPA 92, Section 4.4.4.1.4)

7.0 Total Airflow (Q1 + Q2 +Q3) =QT 0.00 Cu.m/sec) - CFM

8.0 Add Safety of Factor (10%) 0.00 Cu.m/sec) - CFM

9.0 Staircase Pressurization Calculated Airflow Rate: 0.00 Cu.m/sec) - CFM

10.0 Required Relief Airflow (Cu.m/Sec)= Q3- (Q1 + Q2) : 0.00 Cu.m/sec) - CFM

11.0 Req. Size of Relief Damper = Qr/v-acceptable(10.2 m/sec) 0.00 Sq.M - Sq.Ft.

2/2 Stair Pressurization Calculation- Final.xlsx -07/04/23-5:17 AM Prepared by Dr. Reynaldo B. Castillo, PME

You might also like