sanitation in plumbing

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