Installation Guide

FlowGuard Gold
®
JANUARY 2013
5
HYDRAULIC DESIGN
Hydraulic calculations should be made using the
Hazen-Williams C value of 150. The following
table can be used for calculating pressure loss of
pipe and fittings. Losses for fittings are based on
equivalent lengths of pipe. It should be noted that
CPVC will not corrode or scale, so hydraulic
losses will remain constant over the life of the
pipe.
FRICTIONAL LOSSES FOR CTS CPVC PIPE
AT DIFFERENT WATER VELOCITIES
V
1/2" 3/4" 1"
Q P Q P Q P
2 1.14 1.86 2.47 1.20 4.11 0.90
4 2.29 6.75 4.94 4.34 8.22 3.24
5 2.87 10.25 6.17 6.55 10.27 4.89
6 3.44 14.34 7.40 9.18 12.32 6.85
8 4.59 24.45 9.87 15.65 16.43 11.68
10 5.74 37.00 12.34 23.66 20.54 17.66
V
1-1/4" 1-1/2" 2"
Q P Q P Q P
2 6.14 0.71 8.58 0.58 14.72 0.44
4 12.29 2.57 17.17 2.10 29.44 1.60
5 15.36 3.89 21.46 3.17 36.81 2.41
6 18.43 5.45 25.75 4.44 44.17 3.38
8 24.57 9.29 34.34 7.57 58.89 5.76
10 30.71 14.04 42.92 11.44 73.61 8.71
V = Water Velocity, ft. per sec.
Q = Flow Rate, gal/min.
P = Pressure Loss, PSI per 100 ft.
EQUIVALENT LENGTH OF PIPE (FEET)
FOR CPVC SDR 11 (CTS) PIPE FITTINGS
PIPE SIZE
(INCHES)
90°
ELBOW
45°
ELBOW
THROUGH
TEE RUN
THROUGH
TEE
BRANCH
1/2 1.6 0.8 1.0 3.1
3/4 2.1 1.1 1.4 4.1
1 2.6 1.4 1.7 5.2
1-1/4 3.5 1.8 2.3 6.9
1-1/2 4.0 2.1 2.7 8.0
2 5.5 2.8 3.4 10.3
WATER HAMMER
Water hammer is the pressure surge developed
inside a pipe as a result of a rapid change in flow
velocity, which usually accompanies a rapid
closure of a valve in a system.
Bow FlowGuard Gold will develop much lower
surge pressures than metal pipes under the
same conditions because of its inherent ability to
absorb the energy developed. As a result, a
system piped with Bow FlowGuard Gold
®
will
not normally require additional surge pressure
control (arrestors) even for flow velocities up to
10 feet per second. In this range, surge pressures
of less than 100 psi will be developed, and in
most systems, the total surge pressure (surge +
static pressure) will not exceed the generally
accepted limit of 150 psi total. In all cases,
however, local requirements must be respected
with regards to arrestors.
WATER HEATER HOOK-UPS
When connecting to a gas heater, at least six
inches of a metal nipple or appliance connector
should be used so that the CPVC pipe cannot be
damaged by the build-up of excessive radiant
heat from the flue. CPVC can be piped directly to
the heater tapping on an electric water heater.
NOTE: Some code jurisdictions require metal connectors
on electric heaters. CPVC is acceptable for
properly secured relief lines.
Due to its proven ability to withstand short term
temperature/pressure excursions of 150 psi @
210°F for 48 hours, CPVC is acceptable for
properly secured T/P relief lines.