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- The most apparent difference between these two systems is implied by their names – their pressure settings. Low-pressure steam systems don’t exceed 15 pounds per square inch (psi). By extension, they don’t heat water greater than 250ºF. High-pressure systems, on the other hand, create steam above 15 psi.
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Online calculator with Saturated Steam Table by Pressure. Includes 53 different calculations. Equations displayed for easy reference.
Saturated Steam Temperatures. Temperature of Saturated Steam (not super-heated!) at Various Pressures. WARNING: Steam heat is hotter than 212F (boiling water) and increases in temperature as pressure increases. See the steam safety information section. WARNING: Exposure to steam is hazardous.
Properties of Saturated Steam - SI Units. Note! Gauge Pressure = Absolute Pressure - Atmospheric Pressure. NTP - Normal Temperature and Pressure - is defined as 20oC (293.15 K, 68oF) and 1 atm ( 101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 30 in Hg, 760 torr)
Steam and temperature posess a reliable realtionship whereby if the pressure of the steam is known, it's temperature can be predicted (and vice versa). Below is a graph and table of this relationship.
Steam tables based on gauge pressure indicate atmospheric pressure as 0, while steam tables based on absolute pressure indicate it as 101.3 kPa (14.7 psi). Also, to distinguish gauge pressure from absolute pressure, a "g" is typically added to the end of the pressure unit, for example kPaG or psig.
Steam evaporators used in industrial and waste water applications operates with pressures lower that the atmospheric pressure. In steam distribution system the pressure is almost always more than 0 bar gauge. Example - Boiling Water at 100 oC, 0 bar(100 kPa) Atmospheric Pressure.
NTP - Normal Temperature and Pressure - is defined as 20 o C (293.15 K, 68 o F) and 1 atm ( 101.325 kN/m 2, 101.325 kPa, 14.7 psia, 0 psig, 30 in Hg, 760 torr) Vacuum steam is the general term used for saturated steam at temperatures below 100°C .
