The modern steam turbine was invented by Charles A. Parsons in 1884.
  His patent was licensed and the turbine he created was scaled up by George Westinghouse.

  Within Parson's lifetime the generating capacity of steam turbines had been scaled up 10,000 times and had completely replaced the reciprocating piston steam engine primarily because of its greater thermal efficiency and higher power-to-weight ratio.

  Steam turbines are expensive to make and require precision manufacturing and special quality materials.

  But they are also prone to failure if not properly controlled with governors and the purity of the steam maintained.
Without controlling the rotational rate with governors the turbine rotor can accelerate uncontrollably, wich can cause the turbine to continue accelerating until it breaks apart, often spectacularly.
They must be warmed up slowly to ensure even heating to prevent uneven expansion.
Rapid impingement and erosion of the blades can occur if water gets into the steam, and any water entering the blades will likely result in the destruction of the thrust bearing for the turbine shaft.
Any erosion of the blades or imbalance of the rotor can lead to vibrations, which in extreme cases can lead to catastrophic failure and possibly a blade letting go and punching straight through the casing.

 Steam turbines are only efficient when operating in the thousands of RPM range, yet most applications using steam turbines in power or propulsion systems only require rotational rates in the hundreds of RPM, thus steam turbines very often require expensive and precise reduction gears to convert the high RPM of the steam turbine into the low RPM used in the application.

  The advantages of steam turbines are their small size, low maintenance, light weight, and low vibration, and because a turbine generates rotary motion, it is well suited for driving an electrical generator because it does not require a linkage mechanism to convert reciprocating to rotary motion.

  For the same reasons that the Steam Turbine replaced the reciprocating piston steam engine, the Quasiturbine Steam Engine has the potential to replace the Steam Turbine.

  A Quasiturbine has the advantage that:

• The steam pressure required to turn a Quasiturbine could be quite low in comparison to a typical steam turbine
• The rotational rate of a steam Quasiturbine is relatively low, which makes it suitable for direct drive applications
• No reduction gears required
• The flow of the steam would not need to be maintained at a precise and constant rate when using a Quasiturbine
• Efficiency could be maintained over a wide range of flow rates
• Power output is directly proportional to the flow rate
• Far fewer parts
• Less complicated construction
• Less prone to catastrophic failure