Installation Guide

8
PRODUCT INSTALLATION GUIDE
MODULUS OF ELASTICITY AND STRESS VS. TEMPERATURE
Temperature °C 20 25 30 35 40 45 55 65
Modulus of Elasticity E, Mpa 2979 2886 2792 2699 2606 2513 2326 2140
Working Stress Sd, Mpa 14.09 13.19 12.99 11.39 10.48 9.58 7.78 5.97
SWEATING
• “Sweating” of pipes is the formation of water
droplets on the pipe's exterior surface, the
result of condensation of water vapor from
the surrounding air. Sweating requires a cold
surface with warm, humid surrounding air. This cold
surface can be found on any metal pipe carrying cold
water. Typically, the problem is controlled by insulating
the cold exterior pipe surface from the air.
Because Bow FlowGuard Gold
®
is inherently
several thousand times less thermally conductive
than metal pipes, it is effectively self-insulating.
As a result, it has a much greater resistance to
sweating, and will require additional insulators
only under the most extreme circumstances,
i.e. very humid air in combination with very cold,
flowing water inside the pipe. It will not sweat
where metal pipes normally do.
90
85
80
75
70
65
60
55
50
45
40
5101520
CPVC - 7.6 mm
(-NPS - 2)
CPVC - 2.5 mm
(-NPS - 3/8)
RELATIVE HUMIDITY AT WHICH CONDENSATION WILL FORM
NOTE: This figure is included only as a guide. Whenever the Fluid Temperature/Relative Humidity, point is located to
the left of the appropriate data line, (eg. 10°C/70%RH), condensation may form on the pipe.
RELATIVE HUMIDITY, %
FLUID TEMPERATURE, ˚C