V. SUPPLY SYSTEM CONSIDERATIONS
A. Pressure
Liquid pressure is defined as the normal component of force per unit
area. In common practice and general function, pressures are frequently measured in pounds
force per square inch (lbf/in2). Gauge pressure (psig) is the difference
between absolute pressure (psia) and the atmospheric pressure (Pa). Appendix A,
Table 7 shows the relationship between atmospheric pressure and elevation. Vapor pressure
is the absolute pressure exerted by the liquid and its vapor to maintain an equilibrium
condition at a given temperature of the liquid.
Example 7:
Find vapor pressures of water at 76°F and 212°F at sea level..
From Appendix E - Table of Vapor Pressure of Water:
The vapor pressure of 76°F water is 0.4443 psia at sea
level.
The vapor pressure of 212°F water is 14.696 psia at sea
level.
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