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Which type of boilers is preferred cost wise when the boilers are required to raise less than 30 tonnes of steam?

Which type of boilers is preferred cost wise when the boilers are required to raise less than 30 tonnes of steam? Correct Answer Shell boiler

The use of shell boilers are considered to be cheaper when the boilers are required to raise less than 30 tonnes of steam per hour and at pressures 30bar. Above these limits, i.e. for high pressure and high output, water tube boilers are preferred.

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