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When writing to the boiler manufacturers, the following information should be furnished to them:
  1. Lowest ambient temperature likely to be reached during a year at the proposed place of operation.
  2. Elevation of the place above MSL
  3. Maximum working pressure
  4. Maximum steam demands at the working pressure of the boiler.
  5. Fuel to be used and its analysis report.
  6. Whether the load on the boiler is likely to be steady or fluctuating and if fluctuating, then between what limits?
  7. Analysis of the raw water to be used in the boiler after treatment.
  8. In the case of solid fuel fired boilers, whether mechanical firing is preferred.
  9. In the event of any proposed standardization of both the HPs & the make of electric motors that fact should be intimated. 

Information the Manufacturer should be requested to furnish 
  1. Gross Efficiency of boiler
  2. Accessories included
  3. Quality of steam dryness fraction
  4. Flue gas temperature
  5. Grate area(for solid fuel fired boilers)
  6.  Expected  evaporation(kg of steam at working pressure/kg of fuel)
  7. Heating surface area
  8. Delivery Period

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2. Short payback period & increased combustion rate
3. In the case of combustion of pulverized coal hot air can be used for drying the coal as well as for burning the coal efficiently
4. All standard fuels and even lower grades of coals can be burnt efficiently with hot air

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