Boilers Flashcards
How does the state of Massachusetts calculate boiler horse power?
BOILER HORSEPOWER: Manufacturers Tag, Steam Output (lbs/hr) divided by 34.5, BTU/HR Input divided by 41,840 or BTU/HR Output divided by 33,475.
What are the tow primary classifications of boilers?
Fire tube and water tube are the primary classification of boilers.
What boiler type has flat surface?
Fire tube boilers have “flat” surface which require stays and/or staybolts.
What is longitudinal joint?
The steam or joint that tuns the entire length of the shell or drum is the longitudinal joint.
Which type of boiler require stays/stay-bolts?
Fire tube boiler have “flat” surfaces which require stays and/or staybolts.
What type of boilers utilize water wall construction?
Modern watertube boilers often utilize waterwall construction.
What is the highest pressure a boiler can operate at?
The MAWP (Maximum Allowable Working Pressure) is the highest pressure a boiler should operate at.
What size is a manhole? What size is a handhole?
Manhole are 11” X 15” or 12” X 16” (0val shaped) or at least 15” when round. Handholes are 2 3/4 X 3 1/2”.
Where will scale form in a boiler?
Scale will form below the normal water level in a boiler.
How is moisture separated in fire tube boiler?
A “dry pipe” is used to separate moisture from steam in a firetube boiler.
How is moisture separated in a water tube boiler?
Cyclone separators and scrubbers are used to separate moisture from steam in a watertube boiler.
What does an air preheated do?
A air preheated heats incoming combustion air by utilizing the heat in the exiting flue gas.
What does a superheater do?
A superheater elevates the temperatures of saturated steam by utilizing the heat in the exiting flue gas.
What is the main heat loss in a boiler?
Heat loss up the stack is the main heat loss in a boiler.
