Compare a standard pressure boiler and OAB®

steam generator for the drop in temperature for the same piping distance.

OAB is better than a boiler

With any conventional pressure boiler, one is limited to the pressure/temperature rating and, consequently, to the steam temperature rating that is certified for the boiler. For boilers, the pressure and temperature are thermodynamically related. This is called the Psat– Tsat relationship, where the subscript ‘sat’ stands for saturated. P and T are the symbols for Pressure and Temperature, respectively. The maximum temperature for a 2-bar boiler is 121C, for a 6 Bar is 159C, and so on for water(H2O). One bar is approximately equal to 14.5 psi. For a steam generator, the steam is instantaneous—choice of back pressure, steam temperature, and steam flow rate.

For a conventional boiler.    Before entering the delivery pipe, the steam temperature is the boiler temperature. Therefore this is the maximum one can get at the end of the pipe without further heating the pipe. The pure mechanical energy in boiler steam is in the PV term when the boiler is exhausted to a lower pressure (the enthalpy term captures this). As the temperature falls in the pipe transfer process, condensation will occur if the pressure is constant. Of course, as most boiler systems are not built as constant steady-flow systems, the pressure is likely to fall also with increasing distance.

For an MHI steam generator. With the OAB, however, the starting temperatures are already high, and the high mechanical energy is kinetic; no pressure-related certification may be required, and high exit velocities of steam appear without the need for a pressure vessel.

Before entering the delivery pipe,  the temperature is the high exit steam temperature of the OAB. A high velocity in the order of 10m/s or more, depending on temperature, is automatically available, propelling the steam to distances.

Comparison:  Consequently, when comparing the steam travel for the same length of pipe, the same velocity at the inlet to the line, and identical pipe insulation, the pipe exit will be at a higher exit temperature for the steam generator when compared to a boiler. The length of the pipe that supports steam without condensation will be much longer. The OAB’s steam generation technology overcomes problems associated with piping at high pressures with the related safety-concerns in almost all pipe-flow situations.

Use a BPE to protect against back pressure. The BPE is a steam side valve for metering the steam flow.

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