Worksheetssanitation in plumbing
Total questions: 10
Worksheet time: 5mins
A suitable material to use as a water main is
MDPE
LEAD
BRASS
GARDEN HOSE
Copper and galvanised steel should not be used in the same water system because
Limescale will form in the pipework
A fungus will grow within the system
Electrolytic corrosion will occur
You cannot get fittings to connect the two metals together
Rippling to bends on copper pipe tube, when using a scissor benders is caused by what
loss of hydraulic fluid
The former being to tight
The back guide being adjusted too loosely
The back guide being adjusted too tightly
why are standard brass fittings not suitable for use as tappings into water mains below ground
They become brittle due to low temperatures
They are prone to dezincification in certain soils
They will rust
They are far too expensive to hide under ground
A communication pipe is laid in a snake fashion because
It is quicker and therefore cheaper that way
It absorbs ground subsidence without damaging the pipe
It eliminates the need for expensive bedding materials
the snake allows quick fitting, so you get paid faster
An manipulative joint for copper pipe is one of in which
The shape of the tube end is altered before the joint is made
A soft copper ring is provided with the joint
The tube is cleaned and fluxed and solder fed into the joint
The pipe is heated and then manipulated with a lump hammer
Raw water is treated in 3 stages before being distributed to the water main. whats the sequence
sterilisation-filtration-sedimentation
filtration- sedimentation -evaporation
sedimentation- filtration-sterilisation
sedimentation-filtration- evaporation
What is the most suitable method of joining a MDPE buried water mains
Solvent welding
Any cheap fitting off the internet
Electro fusion welding
Brass compression fittings
Why is water mains pipe buried to a minimum depth of 760mm
So you will not hit it with a garden shovel when planting flowers
To avoid other services
To absorb ground subsidence
To prevent damage from freezing
The instrument used to measure the air pressure within a drainage pipe during a test is called what
manometer
viscometer
absolute pressure guage
absolute last option and fingers crossed gauge
