Heating Review#1 Flashcards
(24 cards)
What type of heat energy raises the temp of the water in a boiler
Sensible heat
What’s the max allowable temp of a low temp hot water boiler
250F
What’s the max pressure of a low temp boiler
160 psi
What the max pressure of a low temp cast iron sectional boiler
30 psi
What does ASME stand for
American Society of Mechanical Engineers
How many BTU/hr is one boiler horsepower
33475 BTU
What is the net rating of a boiler
The heat energy value of the burnt by the burner, gas input BTU/hr
What is the gross out put of a boiler
The heat energy available at the boiler nozzle after the stack and jacket losses
What is the net output
The amount of heat available at the heat emitters after transmission losses
What is another name for a horz cast iron sectional boiler
Pancake boiler
What type of boiler can be used directly to heat domestic water
A copper tube boiler
Name 1 high mass boilers
Cast iron and fire tube
What material would a condensing boiler be made of
Stainless steel
What classification would you find a steel tube boiler
Low mass
What material would be used for the header and trim if a copper tube boiler uses directly heat domestic water
Bronze or brass
What symbols would you see on an ASME rated pressure relief valve
V or VJ
What is the purpose of a srv?
To protect the boiler from over pressurization
How must a safety relief valve be pipes
Vertically
What two water temps control devices should be installed on every low temp hot water heating boiler
An operator and a high limit
What’s the max operating temp of a high limit control on a low temp hot water heating boiler
250 F
What are two types of LWCO
Float and probe type
What are the upstream dimensions for a straight piping when installing a flow switch
5 pipe diameters
Over how many BTUs should a LWCO be installed on a boiler
400 MBH or 400,000
A high mass boiler over 400 MBH (400,000) requires what type of safety device
LWCO
