02d Hydrant Flow Test Report_20120601.pdf

June 1, 2012
Claire Tsai-Ochs, Program Operations
New Jersey Schools Development Authority
One West State Street, P.O. Box 991
Trenton NJ 08625-0991
Re:
Fire Flow Test for the Proposed Redshaw School
City of New Brunswick, Middlesex County, New Jersey
Dear Ms. Tsai-Ochs:
On Tuesday, May 29, 2012, Dewberry performed a fire flow test for the referenced project. The purpose
of the test was to establish the available water flow and pressure for the proposed school. In order to
achieve the required pressure drop, we flowed 3 hydrants simultaneously that were located at
Livingston Avenue & Comstock Street (Flow Hydrant #1), Lee Avenue & Delavan Street (Flow Hydrant
#2), Remsen Avenue & Comstock Street (Flow Hydrant #3) as shown on the attached water utility map.
Based on the results of the flow test, it was determined that up to approximately 7,000 gallons per
minute (GPM) of flow can be delivered at a residual pressure of 20 PSI to the proposed school from the
16-inch City of New Brunswick water main located along Comstock Street.
Should there be any questions or comments regarding this matter, please contact me at
jfloystrop@dewberry.com or 973.576. 9688.
Sincerely,
Dewberry
James A. Floystrop, PE, CME
Associate
Enc.
cc:
Corey Nachshen, Dewberry
50053499 Chrono File (all w/ enc.)
Q:\50053499\Tech\Fire Flow Test\2012-06-01 Flow Test Letter.docx

FLOW TEST REPORT & CALCULATIONS
Date of Test: 5/29/2012
Time of Test:
11:00 AM
Test By: Daniel Rocha, Justin Fraser, David Revette, Eric Messina &
New Brunswick Water Utility
Location of
Flow Hydrant:
Livingston Ave & Comstock St (Flow Hydrant #1), Lee Ave & Delavan
St (Flow Hydrant #2), Remsen Ave & Comstock St (Flow Hydrant #3)
Location of
Residual Hydrant: Comstock & Lee Ave
Size of Water Main:
16 Inches
TEST DATA: Flow Hydrant #1
Diameter of Nozzle:
Pitot Pressure:
4.25 Inches
14 PSI
0.9 for smooth and rounded
0.8 for square and sharp
0.7 for square and sharp with
projection into barrel
Q = 29.8 x C d x D 2 x P 0.5
Outlet Nozzle
Coefficient: 0.90 Where:
Q = Flow in gallons per minute
Flow: 1,813 GPM D = Diameter of Nozzle in inches
P = Pitot Pressure (PSI)
C d = Outlet Nozzle Coefficient
TEST DATA: Flow Hydrant #2
Diameter of Nozzle:
Pitot Pressure:
2.50 Inches
13 PSI
Outlet Nozzle
Coefficient: 0.90
Flow:
604 GPM

TEST DATA: Flow Hydrant #3
Diameter of Nozzle:
Pitot Pressure:
2.50 Inches
35 PSI
Outlet Nozzle
Coefficient: 0.80
Flow:
881 GPM
TEST DATA: Residual Hydrant
Static Pressure:
Residual Pressure:
Total Flow:
61 PSI
51 PSI
3,298 GPM
PROJECTED AVAILABLE FLOW
= h 0.54
0.54
h
Q R = flow predicted at desired residual pressure (desired residual pressure = 20 PSI)
Q F = total flow measured during test
h r = pressure drop to desired residual pressure (Static Pressure - 20 PSI)
h f = pressure drop measured during test (Static Pressure - Residual Pressure)
Q R =
Q F =
h r =
h f =
7,067 GPM
3,298 GPM
41 PSI
10 PSI
Approximately 7,000 GPM of flow should be available at a residual pressure of 20 PSI
when rounded down to the nearest 250 GPM.