Practical Problems and Experiences REFRESHER 2

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問題一覧

When using a torch to thaw frozen pipes near wooden structures, you must isolate the area with a:

heat shield

What do you call the unobstructed open edge of the fixture?

rim

Mycotoxins are poisonous chemicals produced by

molds

What does continuous dripping of a single or mixing faucet indicate?

bad washer

The best way to thaw short length of frozen pipe up to 1 1/2" diameter is to use:

electric thawers

How is oil and water separated in oil water separators?

physical and chemical

All are common ingredient for water disinfectant except:

bichlor

What is the size used with the popup drain tailpiece?

32mm or 1 1/4"

What is used to remove ice from a manhole cover?

non sparking tools

Fixture unit value for residential sink

What property is used to distinguish between potable and sanitary UPVC?

color

What is the smallest drain in lavatories?

32mm or 1 1/4"

On what type of drawings are oil water separators located?

utility

The anode rod is installed in the top of water heaters to prevent corrosion?

inside the tank

When do you perform recurring maintainance in a sewer main?

biannually

Water Code of the Philippines

PD 1067

What is that branch vent that serves two or more traps and form in front of the last fixture connection of the horizontal branch to the vent stack?

Circuit Vent

To repair a broken sewer main, where should you block off the manhole?

outlet side

The distance between the floor and the drainboard in a kitchen sink is:

34"

What is the correct chlorine usage and contact time for disinfecting a water main?

50ppm/24hrs

A term used to describe pumps that are interconnected with each other

series

A pump used to eject sewage or liquid waste

central sewage booster

Which types of sewage lift station houses the pumps and motors in a different compartment than the one that receives the wastewater?

dry well

What would be the safe horizontal distance from the foot of the ladder to the wall?

1/4 of ladder's length

What type of drainage system collects waste from rain and melting snow?

storm sewer

When you install an individual vent, how many inches must be venting pipe rise above the fixture flood rim before it changes direction?

A type of coupling or joining device having internal screw threads or nuts with the opposite screws at the end. It is possible to connect two metal rods. By turning the internal screws, it is possible to connect two metal rods and regulate the length and tensions of this rods:

turnbuckle

What can you use as a substitute for soapy water when leak testing pipe during freezing weather?

linseed oil

What shower/batch mixing valve is sensitive to both temperature and pressure?

thermostatic mixing valve

A house drain that receives discharges from industrial equipment that contain some objectionable acid wastes

industrial drain

Minimum size of water supply for a drench type emergency shower and eye watch

32mm or 1 1/4"

Screwed steel pipe 2 1/2" diameter should have this number of threads for effective jointing

Maximum depth of digestive chamber in a septic tank

1.8m

What is the principle of governing the size of pipes in designing plumbing systems?

The bigger the pipes diameter, the lesser the pressure; the smaller the diameter, the greater the pressure

It is a traps seal loss due to unequal atmospheric pressure condition and due to rapid flows of water through the trap

siphonage

PD 1096 prescribes that dry standpipes is required for every building of how many floors?

4 or more

In a location where there is no provision of drainage line, what is the next best thing?

Store waste in a tank and dispose in sanitary landfill

During inspection, an architect notices that a soil pipe will cross the beam. What is the best advise he can do?1

Simply ask to relocate

How does a soil stack differ from a waste stack?

A soil stack carries human fecal discharge from water closets, urinals or other similar fixtures, whereas waste stack does not

Kind of pipe not suited to be exposed to ultraviolet rays

PVC

Two classes of drainage piping

soil and waste pipe

Is that portion of the horizontal drainage system which starts from outer surface of the building and terminates at the main sewer or in septic tank

house sewer

The tub overflow and drain assembly is not included in the roughing-ins piping for a bathtub because it is attached directly to the

tub at the time the tub is set

All of the following are characteristic of bases except:

They have pH between 0 to 7

The drain cock with the hose connection at the bottom of a water heater is primarily used to:

flush sediments out of the heater

What are the primary means of inspecting and maintaining the sewer?

cleanouts

It is the pipe extension of a solid waste or easte stack above the highest horizontal drain connected to the stack though roof

SVTR

At what intervals are manholes usually places in sewer mains?

300ft to 500ft

Minimum size of trap and waste branch for a shower stall

51mm or 2"

How do you repair a water closets leaking flapper

replace flapper

How do you connect 2 hubless cast iron pipes?

shielded coupling

Which plumbing fixtures does not have a water saving feature?

flow limiting feature

What disinfection method is preferred on new water mains because of its simplicity and ease of use?

calcium hypochlorite tablets

Which wall is best suited if soil pipe will run through it?

6" CHB

After threading of a GI pipe thru a stack and dies the next step for plumber should do is to ream the inside of pipe for what purpose?

remove deformation which will cause reduction of pipe diameter

Recommended minimum pipe size for floor drain P-trap

51mm or 2"

What is the most efficient tool for cutting cast iron pipe?

snap cutter

Where is water meter located?

right after main distribution line connection

What is the name of a short piece of pipe with a hub at one end and a straight cut or 45° cut on the other end that is used to tap into a sewer main?

thimble

In inserting a wye into laid house sewer, the practical procedure is:

Cut the sewer to the length and insert the wye and cement joint end

What is the normal working pressure of a gas water heater?

150psi

Why must grease traps be installed in large military or commercial kitchens?

A properly installed trap will prevent stoppages caused by grease solidification

Which of these materials best for vent pipes in an acid waste system?

plastic

What is the correct method of disposal for discarded grease, fats, and oils?

Throw away into a garbage

All of these are reasons why soil stacks are not allowed in columns except:

The size of the columns will be larger

What is the mininum depth of building sewer when installed?

300mm

What is the standard water consumption (gallon/person/day) used in a 2 storey residence?

30-40 gpd

What is the desired fall for a 3" house sewer?

1/4 in/foot (2%)

What is used to find the location of fixtures in a building?

plumbing blueprints and floor plans

DFU for slop sinks

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