Feb 28 2003 · Water can be kept liquid for example at temperatures more than 300 degrees Fahrenheit above its boiling point because it needs a onetime injection of energy to start vaporizing. A liquid under tension wants to be vapor but it needs a boost or a lowering of its energy barrier to change phases.
Jan 01 2013 · Where "negative pressures come to be a problem is in higher temperature closed systems where the water can go over the boiling point. Like water boils at 244 degrees at 12# PSIG. Vapor/Vacuum steam systems work because the goes and the turns to steam at less than 212 degrees.
Jan 19 2015 · At 12-psi the boiling point at the fill valve/gauge is 246 F. At 28' it is 212 F. If the level of the water isn't high enough because there isn't enough fill pressure the suction pressure on the loop may cause the first water to boil that comes from the boiler on a warm-start boiler.
Water Boiling Points at Higher Pressure - Online calculator figures and tables showing boiling points of water at pressures ranging from 14.7 to 3200 psia (1 to 220 bara). Temperature given as °C °F K and °R. Water Vapor and Saturation Pressure in Humid Air - The saturation pressure of water vapor in moist air varies with temperature
Pressure must be within the ranges 1-220 bara 14.7-3200 psia 760-165 000 mm Hg or 30-6500 in Hg. Boiling points of water at absolute pressures ranging from 1 to 70 bara or 14.7 to 1000 psia are indicated in the figures and tables below: See Water and Heavy Water for
Boiler Water. Boiler water returned to the feed system by methods 2 and 3 does not reduce the dissolved solids in the boiler and must not be accounted as part of the blowdown for deconcentration ... In water boilers steam is produced from a bath of liquid that is heated to above the 100°C of at atmospheric ...