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Moisture Problems during Turbine Storage/ Power Plant Layup

Moisture problems during Turbine Storage/ Power Plant Layup

 

Turbines are indispensable for power generation and like work. It is necessary to maintain Turbines and  other equipment in prime condition while in operation and during storage. This enables smooth running of the turbines and also ensures  that they are capable of going 'on-line' immediately post storage.

 

Uncontrolled  Moisture single major cause of damage to turbines while in operation and during storage

 

Moisture however  plays havoc with Turbines, Power Generators, Boilers, Condensers etc. These equipments begin to rust and corrode while in storage or  while  in operation.

 

Corrosion hinders smooth functioning of  the turbine- decreases reliability

 

  • Expensive metal parts like rotors, compressor parts, bearings, buckets and blades, gearbox parts corrode,  non metallic parts deteriorate. This disables parts and components, necessitating frequent  repair/replacement and maintenance costs. The downtime costs are exorbitantly high. Moisture Control is  critical in off shore sites. 
  • Steel blades become brittle. Heat does not spread evenly on the corroded steel blades which results in unsatisfactory vibration. 
  • Rusting  reduces the strength and the structural characteristics of materials. The capability to withstand stresses and temperature is decreased. This compromises safety as  materials no longer have that the extra strength.
  • Corrosion of  electronic and electrical components result in serious malfunctions.
  • Low pressure steam turbine disc cracks. This problem is common to rotors used in nuclear and fossil fuel power plants.
  • Condensing type of turbines are evidently  more affected by corrosion as large quantity of water is collected as condensate.

 

When the relative humidity crosses 40% mark corrosion is further accelerated as  industrial pollutants like Sulphur Dioxide also contribute to rusting / corrosion.

 

Power Plant Layup

 

Power Generating equipment and Power Plants are shut down temporarily or for  extended period

 

  • hold until start up
  • partial shut down due to excess capacity
  • standby in case of break down
  • maintenance and repair for example
  • extended cold standby

 

Nuclear Plants are  shut down for a year for refueling. Fossil Fuel power stations need to be laid up for furnace or boiler repair. During this idle period it is necessary to feed dry air to decrease the chances  of  corrosion / rusting mentioned earlier.

 

Controlling Corrosion ... through Dehumidification

 

If the relative humidity of the area where expensive equipment is stored can be restricted below 40%, then all equipments like generator, turbines and their components can be maintained in well -preserved condition for immediate activation whenever required. Dehumidification prevents corrosion, mold and mildew growth and prevents deterioration of equipment.

 

Bry Air Dehumidifiers

 

Ensures Reliability and hassle free  functioning.

 

Bry-Air Dehumidifiers enable smooth operation of turbines; ensure that it goes 'on line' immediately by restricting relative humidity in the area where expensive equipment is stored.

 

Bry-Air Desiccant Dehumidifier are capable of maintaining a RH as low as 1% or even lower at constant level, regardless of ambient conditions and thus maintain the ideal environmental conditions for Turbine Storage / Power Plant Layup.

 

Bry-Air Dehumidifiers offer the simplest and most cost-effective solution to moisture/humidity problems during Turbine Storage/ Power Plant Layup therby preventing costly repairs and emergency outage.

 

References for Turbine Storage

 

  • Baroda Rayon Corporation Ltd., India
  • Bharat Heavy Electricals ltd. (BHEL), India
  • Duke Power, USA
  • Duquense Light, USA
  • Gulf State Utilities, USA
  • Jacksonville Electric Authority USA

 

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