IP practice 2 Flashcards
when installing a septic tank u can use a gravity system if ____ ..
field is lower than the outlet of the tank
when the field is above the inlet of the septic tank what must u use
a pump
what could be the problem if boiler safety relief valve keeps discharging
failure of pressure reducing valve or faulty aquastat
what do u require on a cooling tower
water softener, rp, pressure vacuum breaker, and air gap
what type of heater can be use when theres not enough room for fin
kick space heater
what connectors does a chiller use
flexible flanged connectors
on recessed forced flow heating install thermostat on
return air next to the unit
best location for a wild loop in heating
inside doorways (vestibules)
wiring on submersible should be strapped every
10ft
pipe from pitless adapter should be graded ____ …
up towards the house
1) when troubleshooting pump there is high amperage, what is the problem
2) low amperage ?
3) no amperage ?
1) high amp means impeller is stuck so the pump is working too hard
2) low amp means theres low water in well, impeller is broken or venture is plugged
3) no amp means defective pressure switch, switch tube might be plugged
when there is cavitation what could be the problem w the pump
pump is working above max lift capacity, and there’s a pressure difference between inlet/outlet
standard pressure tank is ___ air and ___ water
1/3 air and 2/3 water
what is a common problem when there is hardness in the water
there is calcium and magnesium
degrees of hardness in water starts from very soft at 0 - ____ and adds ____ every time it gets harder
0-50, adds 50 to get to next level of hardness and so on ex. mid soft is 50-100 mid hard is 100-150 etc
temporary hardness settles at ___ deg C
permanent hardness at ___ deg C
temp hardness - 60 deg C
perm hardness - 140 deg C
what causes back siphonage ? it might happen to a hose bib so what does it require
negative pressure in the system, like a vacuum. so hose bibs require a vacuum breaker
test pressure for medical gas
150psi or 1 and a half times its working pressure whichever is greater for 24 hours
if flush valve has a long flush it could be because of a
dirty/plugged bypass
distance of soil from edge of trench
1m or 3’3”
max heigh of rp to floor
5 feet
if a zone valve is noisy it was probably installed ___
backwards
where do u install mitigated radon pipe
under slab
interior leaders and sows must have a cleanout where?
3m upstream from the bottom of the leader or stack
when doing a ball test what are the min. diameters for the ball
50mm for pipes 3 inches or more
25mm for pipes less than 3 inches
minimum trap arm length of unvented fixture drain
also the standard height of the trap arm for a lavatory
18 inches or 450mm
minimum trap fixture drain
2”
max height from manhole taper
1m
what to do if hot water pipe is longer than 30m or extend 4 storeys ?
provide recirculation
what type of copper is permitted in drainage
dwv copper, type k, and type L hard copper
PVB shall at least _____mm above the flood level rim of a fixture or tank
300mm
how do u change top element in a hwt
shut power then water, drain tank, change element, close drain, turn on water then power
insufficient hot water from a hwt could be because of a
broken dip tube
what fitting could be use in between cleanouts on a building sewer
2 - 22 1/2 elbows
which drawings should be referenced when determining (DETAILED) locations of sleeves in concrete floors in high rise construction
gridlines on the architectural drawings
what is another way of protecting underground piping besides thrust blocks
continuous rodding
what equipment is installed when booster pumps are used in the water distribution piping of a high rise
expansion tanks
where is the jet assembly located for a deep well jet pump
5 feet below the water level
at what pressure should a diaphragm pressure tank be pre-charged to
2-3 psi below the cut in pressure
flood level rim height of a standard water closet is
15 inches
in the gasfitting and refrigeration trades copper tubing sizes are commonly specified by
their exact outside diameter
note: for copper water sizes in the plumbing trade we use nominal inside diameter
what knot can be used to join two ropes of different diameters
sheet bend
what type of hanger is use to support multiple pipe lines
trapeze
what type of drawing is used for more accurate scale and a more realistic appearance to represent a piping system
double line drawings
the minimum number of planks and their dimensions for a working platform shall be
2 planks, 2 inch x 10 inch nominal
what type of valve is used in the food processing industry to avoid product contamination
diaphragm valve
what are the requirements for installing a zone shut off valve within a valve box used for medical gas
if the valve handle is closed, the door can not be closed
air dryers are installed downstream of the ___ ____
receiving tank
branch lines for a compressed air system should be taken off the ______ of the supply main
top
if the pressure of water in a hydronic heating system was to drop below boiling what is the result
cavitation
turning a prv’s adjusting screw clockwise will ____ ____
increase pressure, vice versa
where is the cooling coil located on a combination heating and cooling furnace system
in the supply plenum close to the furnace
which type of hanger or support would be used on a piping system that may experience a wide temperature variation
roller
an expansion tank in a hydronic heating system should be able to accommodate a ____ increase in water volume
4%
the type of valve used to even out the flow in split zone heating system is the
balancing valve
the type of valve needed on a domestic hot water side of a heat exchanger would be a ______ valve
tempering
what device is used to sense an unsafe water level in a hot water heating system
a low water cut off
what is required when a conventional boiler is installed in a low temperature radiant floor heating application
a mixing valve
which piece of equipment would be required on all steam boilers and hot water boilers over 400 MBH
low water cut off
when using a solar heating system like a space heating boiler to heat domestic hot water, which equipment is required
heat exchanger
what is a heated area that is required by one circulator, control or thermostat
zone
where should the connections be made on an upfed cast iron radiator
bottom in bottom out
what would be installed between a cooling fan coil and the fixed piping attached to the building structure
isolation valves and flex connectors
what would be installed in the piping to and from a chiller when it is being supported by rubber isolation pads
flex connectors
where would the FLOW SWITCH be installed in a low mass boiler
on the hot water supply line from the boiler
where should the balancing valves be located for a radiant panel heating system
on the return header
when a boiler is being used to heat the domestic water through an indirect tank, what are required on the domestic water piping
check valve and tempering valve
this device adjusts the boiler water temperature depending on the outdoor temperature
boiler reset control
max cumulative change of direction allowable on a trap arm for a basin
135 degrees
which of the following best describes the length of time for a piston or diaphragm flush valve to cycle
size of the bypass orifice
how is the volume of a urinal flush tank controlled
metering valve
if the jet assembly in a deep well jet pump system must be lowered what must be done also
re-adjust the control valve
which chemical will damage pyrex pipe
hydrofluoric acid
