What is thermal efficiency and what is a good percentage?
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, It is the ratio of heat supplied by fuel to heat absorbed by the boiler.
A good percentage is 85%
What is an alloy? Name five.
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An alloy is a mixture of two or more metals.
Types - brass, stainless steel, cast iron, steel, pewter, Babbitt
What is rate of combustion? Does air and fuel have any relationship in figuring the rate of
combustion?
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Rate of combustion is the rate at which heat is released from a fuel.
Yes - When oxygen and combustible are mixed in definite proportion at an
elevated temperature and given proper time, they will combine completely.
What types of stays are used in wet back (Scotch Marine) type boilers?
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, Stay bolts through stays
These will sometime have a telltale hole drilled into them so if they leak it will
whistle.
What is meant by factor of safety?
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Factor of safety is the comparison of the tensile strength to the actual working
stress. The bursting pressure divided by the working pressure.
Define purging and name two types.
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Purging is the forced removal of combustibles from the firebox.
Pre-purge is purging the firebox before the pilot is lit.
Post-purge is purging the firebox after the combustion cycle.
In a flue gas analysis, what do you consider a good percent of CO2?
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12% - 15% With 20% ideal, but mostly unattainable
Give this one a try later!
, It is the ratio of heat supplied by fuel to heat absorbed by the boiler.
A good percentage is 85%
What is an alloy? Name five.
Give this one a try later!
An alloy is a mixture of two or more metals.
Types - brass, stainless steel, cast iron, steel, pewter, Babbitt
What is rate of combustion? Does air and fuel have any relationship in figuring the rate of
combustion?
Give this one a try later!
Rate of combustion is the rate at which heat is released from a fuel.
Yes - When oxygen and combustible are mixed in definite proportion at an
elevated temperature and given proper time, they will combine completely.
What types of stays are used in wet back (Scotch Marine) type boilers?
Give this one a try later!
, Stay bolts through stays
These will sometime have a telltale hole drilled into them so if they leak it will
whistle.
What is meant by factor of safety?
Give this one a try later!
Factor of safety is the comparison of the tensile strength to the actual working
stress. The bursting pressure divided by the working pressure.
Define purging and name two types.
Give this one a try later!
Purging is the forced removal of combustibles from the firebox.
Pre-purge is purging the firebox before the pilot is lit.
Post-purge is purging the firebox after the combustion cycle.
In a flue gas analysis, what do you consider a good percent of CO2?
Give this one a try later!
12% - 15% With 20% ideal, but mostly unattainable
