low pressure steam quiz Flashcards
what is the min size safety relief valve permitted on a steam boiler
3/4”
how is a boiler safety valve capacity selected for a given boiler rating based on the boiler _____ rating
output
what is the method used to determine a boilers efficiency?
net output divided by gross input
what is the purpose of the hartford loop piping configuration used on a cast iron boiler?
prevents loss of boiler water in the event of a failure of the return piping
the basic purpose of a steam trap is to prevent the HTU from flooding with ________
condensate
a steam trap operates by sensing the presence of condensate and ______
opens
which force moves heat energy through a low pressure steam heating system?
a. high temp
b. pump head pressure
c. system pressure
d. all of the above
d. all of the above
how does a steam boiler differ from a hydronic boiler?
a steam boiler utilizes a steam ______
drum
what is the normal operating conditions in a steam heating system?
a. operating pressure levels are low
b. max pressure level is 15 Psig
c. operating temp is dependant on operating pressure
d. all of the above
d. all of the above
what effect would higher operating pressure have on low pressure steam heating systems?
noise caused by velocity movement
what is used on most modern higher capacity steam heating system, to return condensate to the boiler?
pumped condensate return
what are try cocks on a level gauge used for?
verifyinf boiler water level
what is the purpose of the pigtail piping arrangement used to connect controls and gauges to the boiler?
protects the control or gauge from live steam
how does a one pipe steam system return condensate to the boiler?
gravity system piping installed above the boiler
what is the purpose of the air vent on a cast iron radiator?
prevents air from stopping the flow of steam into the radiator
which device allows for zone control of a steam heat system?
a control valve
what normal pressures might be expected throughout the year from a low pressure stam heat syste,?
0 Psig to normal operating pressure
what is the difference between a water tube boiler and a fire tube boiler?
water tube boilers pass water through the tubes
what advantage would a steel boiler have over cast iron boiler?
steel boilers have a higher pressure rating
why are cleanout crosses required when connecting LWCO’s to a boiler?
they allow for rodding of the piping connection to the boiler
what is the purpose of a blow down valve on the bottom of the boiler?
clears the mud drum of sludge and sediment
