Single Cylinder plants

These are usually found on short run ships such as passenger ferries although there present day use is very restricted
< for="" vessels="" on="" short="" runs="" a="" turbine="" installation="" is="" required="" able="" to="" cope="" with="" wide="" and="" rapid="" variation="" in="" loads="" therefore="" temperature="" conditions.="" this="" designs="" warming="" through="" time="" benficial="" the="" ships="" operation. For this design criteria the Single Cylincer Double Casing turbine was developed

Advantages of using A single cylinder
• Lower first cost
• Easy to inspect and maintain
• No cross over pipes to give heavy side thrust
• Short warming through time, rapid shut down time
• Rapid manouevring
• Single setting gland control ( glands are operating subatmospheric all times)

Advantages of using A double casing
• As the glands operate on the low pressure side of the turbine they may be of simplified and shortened design
• The outer casing temperature is only slightly above engine room temperature simplifying lagging requirements.
• The outer casing may be fabricated from mild steel
• Radiation losses reduced at full power
• Smaller temperature gradients reduce the possibility of distortion
• All expansion/contraction and side thrust is absorbed by the inner/other casing interface reducing the possibility of misalignement to the gearing

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