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Fire Pump Head Calculations

This document outlines the fire pump head calculation for a project, detailing abbreviations, parameters, static head, residual pressure, friction loss in pipes, and fittings. The calculations indicate a total head requirement of 264.26 ft (80.55 m) or 120 Psi for the fire pump. The document is structured into two sheets, providing a comprehensive overview of the necessary calculations and values.

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117 views3 pages

Fire Pump Head Calculations

This document outlines the fire pump head calculation for a project, detailing abbreviations, parameters, static head, residual pressure, friction loss in pipes, and fittings. The calculations indicate a total head requirement of 264.26 ft (80.55 m) or 120 Psi for the fire pump. The document is structured into two sheets, providing a comprehensive overview of the necessary calculations and values.

Uploaded by

shaik.jakeer
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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Design calculation sheet

Project no: Date: 20-09-07 Sheet No. 1 of 2 Computed by: ASF


Subject: Fire pump Head Calculation Checked by:
Approved by:

1- Abbreviations:
Hs = Static Head (m)
Hr = Residual Head (m)
HL = Friction Loss Head (m)
Q = Flow rate (gpm)
C = Hazen-Williams C value
d = Diameter of pipe (inches)
P = Frictional resistance (psi /ft of pipe)

2- Parameters:
Q1 = 1250 gpm
Q2 = 750 gpm
Q3 = 500 gpm
d1 = 8 inch
d2 = 6 inch
d3 = 6 inch
L1 = 50 m
= 164.04 ft
L2 = 90 m
= 295.28 ft
L3 = 100 m
= 328.08 ft
C = 120 (see NFPA13 - Table 22.4.4.7)
P = 4.52 * (Q) /C
1.85 1.85
*d 4.87
(see NFPA13 - Enc# 22.4.2.1.1)
3- Static Head:
Hs = 0 m
= 0.00 ft

4- Residual Pressure:
Hr = 6.9 bar
= 230.86 ft

5- Friction Loss Head:


1- Friction Loss in Pipes:
P1 = 0.01380 Psi/ ft
P2 = 0.02177 Psi/ ft
P3 = 0.01028 Psi/ ft

HL1 = 2.26383 Psi


HL2 = 6.42906 Psi
HL3 = 3.37393 Psi

HLT = 12.07 Psi


= 0.8320071 bar
= 27.84 ft
Design calculation sheet
Project no: Date: 20-09-07 Sheet No. 2 of 2 Computed by: ASF
Subject: Fire pump Head Calculation Checked by:
Approved by:

2- Friction Loss in Fittings and valves:

HLF = 5.57 ft (20% of pipes)

6- Head of fire pump:

H = Hs + Hr + HLF + HLP
= 264.26 ft
= 80.55 m
= 7.90 bar
= 114.55 Psi

H= 120 Psi

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