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Monotube steam generator

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Title: Monotube steam generator  
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Subject: LaMont boiler, Thimble tube boiler, Superheater, List of boiler types, by manufacturer
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Monotube steam generator

Herreshoff steam generator in a Peruvian torpedo boat of 1879

A Monotube steam generator is a type of steam generator consisting of a single tube, usually in a multi-layer spiral, that forms a Once Through Steam Generator (OTSG). The first of these was the Herreshoff steam generator of 1873.[1]


For the sake of efficiency, it is desirable to minimise the steam content of the generator. Heat can then be transferred efficiently into liquid water, rather than into low-density steam. Monotube steam generators may either boil gradually along their length, usually pumped circulation systems,[2] but where this boiling does not disrupt the circulation. Otherwise they can use the Benson supercritical system, where the pressure is sufficient to prevent boiling (within the heated volume) altogether.[3]


White steam car steam generator

Examples of Monotube steam generators include:

Flash boilers

A Flash boiler is a particular type of low-water-content monotube boiler. Modern use is confined to model steam boats but, historically, flash boilers were used in Gardner-Serpollet steam cars.

See also


  1. ^  
  2. ^ Newest on Process Equipments (2012-11-25). "Boilers circulation systems: natural circulation and forced circulation". Enggcyclopedia. Retrieved 2012-12-02. 
  3. ^
  4. ^ Clayton Thermal Products UK - Steam Generators Principle of Operation
  5. ^
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