Plumbing Flashcards
what section of sheet metal externally fixed to a steam or hot water coil to increase radiation surface in heating known as?
a fin
what is a draftsmans symbol on architectural drawings for a heating unit?
a rectangle with a diagonal line going from bottom left to top right
the heating value of natural gas in BTU per cubic feet is most nearly:
1100
which of the following is an enclosed passageway, such as a pipe or chimney for carrying off smoke, gases or air?
a flue
what is the symbol for an air conditioning unit
a solid rectangle inside of a rectangle
for what is an “escutcheon” generally used
a metal collar
what are durham fittings used for?
drains
a close nipple is defined as a short piece of pipe, threaded at both ends and having
no shoulder
what is heating with coils or pipes in the floor, walls or ceiling known as?
radiant heating
which of the following designates copper water tubing used for drainage systems?
DWV
an exposed metal heating duct is insulated when
at all times
what is the term “sheathing and bracing” most nearly associated with in plumbing work
excavation
the pitch of a house sewer should be no less than
1/4” per foot
how is type k copper usually classified?
extra heavy hard
the size of the fresh air inlet is generally based on the size of the
house drain
hat is the normal water pressure for a house
30 to 80 psi
what is the device that stops sewer gas odors from coming into the house
a trap
the pipe used to carry waste materials from a closet bend is a
soil pipe
how are drainage systems tested for leaks
water test
what do the colored marking on copper tubing stand for
its wall thickness
what is the minimum r-value in performance citeria that is used as insulation around a hot water heater
r-6
which of the following types of insulation has the highest R-value
fiberglass
atmospheric pressure at sea level is most nearly
14.7 psi
one cubic foot contains approximately
1728 cu. in
