Practical Problems and Experiences REFRESHER 1

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Question list

In plumbing systems, if pipes are electrical wires, what are equivalent to switches?

valve

Mininum size of trap and waste branch for pedestal urinal

What type of materials is used for the base of septic tank?

reinforced concrete

What is the color pipes for steam

white

Black steel pipe with galvanized malleable fittings is ideal for:

gas pipe

Chemical used for checking the growth of algae in reservoir

copper sulphate

The proper fall for a house sewer is established by:

establishing a grade line then digging the trench exactly this line

A drain connecting one or more fixtures to a solid or waste stack

combined drain

In a building drainage system, what is a definition of a stack?

Vertical pipe of a system of soil, waste or vent piping that extends through one or more stories

Where should a grease trap be installed?

As close to the fixture as possible, preferably inside the building

Which is not a rule of thumb when designing a drainage?

It should be underneath the driveway

What is the greatest stress which a material can stand without permanent deformation after release of stress?

tensile stress

What is the color coding for pipes for potable water

blue

A caulked joint shall be firmly packed with oakum or hemp and powder received with pure lead, what is the depth of lead over aukum?

25mm

Can you embed a 4" pipe in a 150 CHB wall?

How do we size sewage pits?

Volume of liquid and solid waste

What type of sink is used for dumping mop buckets and washing mops?

service sinks

What is used to determine the size of the stack after the fixture unit values have been totaled?

stack table

Part per million is identical to:

milligrams per kg

Minimum distance of a well from a septic tank

15.2m

Where do you locate water distribution pipe farthest from?

large trees

What should not be permitted to cross a beam?

soil pipe

When water goes up through a vertical pipe, it stops at a certain height. Why?

The pressure inside the pipe equates to the pressure outside the pipe causing the water to stop at that point where it appears

Per capita consumption of water is generally taken as:

50-100 liters

Which antifreeze solution should be your first choice when you are protecting fixture traps against freezing?

glycol

Is a receptacle used to catch surface water drained from cemented courts, driveways, and yards.

yards catch basin

A device used in conjuction with a fixture such as water closet and urinal which discharges a pre-determined quantity of water for flushing purposes. This device is actuated by direct water pressure from branch pipes.

flushometer valve

When there is a low pressure from the water main, what will you use to supply higher levels?

booster pump

Fixture unit value of bathtub

A domestic food grinder is designed to attach to drain with a diameter of:

1 1/2"

What part of the body-unit faucet virtually eliminates maintenance of the faucet under normal operations?

ceramic component

What is the water depth of a common seal trap

What type of end connection are used for valves smaller than 2" diameter?

threaded

Best location to put the soil pipe

pipe chase

Water well yield is a factor considered in determining the size of:

water pipe

When specifications is not available, install the urinal so the lip height is:

20-25" above the finished floor line

The basic elements of a cold water supply include the:

riser run-out

Tank water closets are preferred over flushometer water closets for residences because they:

require smaller size supply

The code that prescribes criteria on the quality of drinking water from meteoric, surface or underground sources is:

National Standards for Drinking Water

In high rise buuldings, why is there a need to resize water supply pipes?

To use up the difference in pressure from the service to the supply fixtures

In preparing a mortar for a cement joint, the mixture will be:

one part cement, one part sand and water

How do you repair a leak on a plastic pipe fitting?

Cut fitting out and install new fitting

When winterizing the system, what is the first step in draining a water system?

Close the main shutoff valve

Alternative to the conventional septic tank:

aerobic treatment system

In a water distribution system, what connects the water main to the water risers

riser run-out

Best for sanitary pipes

UPVC

Fixture outlets shall not be connected to the horizontal drainage within ______ of any vertical to horizontal change of direction of a stack containing suds producing fixtures.

2.4m

What is the name of the special tool designed to reach the hex jam nut beneath a fixture?

basin wrench

What may happen if a sewer pipes is laid with a fall greater than 1/4 inch per foot (2%)?

Waste water runs away from solids, eventually causing stoppages

Which type of lavatory is designed for group use?

countertop

A fibrous silicate material that is inert, strong, and incombustible

asbestos

It is caused by foreign objects like string or thread suspended over outlet arm of the trap

capillarity action

When installing a compression coupling, why do you dig out the area to give you as much flexibility with the pipes?

To allow easier installation

What is corresponding name of the following abbreviation pertaining to local trade and government regulating body

DTI

The building sewer is usually made of clay tile, cast iron, asbestos cement and:

plastic pipe

What is the best fixture for a public comfort room?

flushometer

What type of drainage piping only conveys liquids that are free of fecal matter?

waste

FU of laundry tub

What is installed on fixtures to keep sewer gasses from entering the building?

traps

Chemical drain cleaners are appropriate when drains are:

flowing sluggishly

What is the proper way to tighten bolts on a full circle clamp?

Working from the center out

Revised Fire Code of the Philippines

RA 9514

All dry standpipe shall extend from the ground floor and over the roof and shall be equipped with 64mm outlet in every floor level with a minimum height of:

1.2m

What should you do if an oxygen deficient condition is present in a manhole?

Ventilate it or use self contained breathing appratus

For best result how should you backfill a trench?

Backfill in layers or not more than 4" and tamp with mechanical tamper

What is the proper length of time and velocity for flushing a main?

30min/2.5fps

In constructing a sewer main, when should you backfill the trench?

after you inspect the pipe

Which of the following is not a type of lavatory?

reverse trap

Minimum clearance from the floor of pipes for AC units when crossing a hallway or corridor

2.3m

Swimming pool needs:

de-chlorination

FU for shower bath

Size of water supply line for urinal flushometer

19mm

In storm drainage system, it is used to prevent aggregates, debris and other unwanted objects from entering the drainage system

catch basin

If a faucet closes with the pressure; not against it, the result is:

easier operation and tighter seal

Smallest plastic drain that can accummodate a water closet

38mm or 1 1/2"

What is the smallest plastic drain that can accommodate a water closet

76mm or 3"

What do you call a control valve used to shutoff at the water supply to a building in case of emergency? It is installed at a water service pipe and operated by means of long key inserted through a curb box?

curb cock/stop

A system of vertical pipes in a building to which fire hoses can be attached on each floor, including a system by which water is made available to the outlets as needed.

standpipe

Where will you least place a downspout?

inside columns

What should not be used for a pipe chase

drywall

The water service is a pipe that extends from the:

water main to the water meter

In which order is a water main disinfected?

flushing, dosing, flushing, testing

The unobstructed vertical distance through the free atmosphere between the outlet of water pipe and the flood level rim of the receptacle into which it is charging

air gap

Mininum size of trap and waste branch for a bidet

51mm or 2"

Ball valves are adaptation of:

plug valves

There is a septic tank installed on top of a rock by seashore. The tank is exposed on how tide and covered in sea water during high tide. Which of the following woupd be an appropriate water proofing for it?

waterproof all surfaces

WSFU for stall and wall urinal

Clean Water Act

RA 9275

Where are storm sewer usually placed?

near the curb

The spoon like tools use for pouring molted pig lead into hub as making caulk joint in cast iron pipe is called:

scoop

Take advantage of a salaried ________ position to compete unfairly with a practicing Master Plumber.

government

Aeration is water is done for all of the following purposes except for

removal of temporary hardness

In PD 856 Sanitation Code of the Philippines, the effective depth of a septic tank is measured from the bottom of septic tank to the _______.

liquid line

What type of repair clamp should be used as a temporary repair

compression coupling

What is the minimum sized pipe that you could use on wet vent?

51mm or 2"

Clean Air Act

RA 8749

Which is the common practice to reduce the danger of breakage which may result from expansion and contraction of roof?

provide the end of roof leader with flexible material

A drinking fountain bubbler opening should be located above the drinking fountain rim a minimum of:

25mm or 1"

Heavy water is:

D20

100

Provincial Water Utilities Act

PD 198

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