Module 1 Mild Steel Pipework

Question 0

What % of carbon is in mild steel?

Answer 0

mild steel is an alloy and up to 0.2% carbon hence the term LOW CARBON STEEL

Question 1

What is mild steel pipe also known as??

Answer 1

Low Carson steel pipe

Question 2

What finishes does mild steel come in?

Answer 2

Painted red and also galvanised

Question 3

What is mild steel used for?

Answer 3

Hot water heating systems (no air in them) and gas supplies only

Question 4

What would happen if used with fresh water?

Answer 4

It would be liable to corrosion problems

Question 5

How is galvanising steel done?

Answer 5

By hot dipping it in molten ZINC

Question 6

What should not be done to galvanised tube?

Answer 6

Never be welded as heat would remove the zinc coating and be open to corrosion

Question 7

Mild steel pipe explain about it??

Answer 7

Comes in 6m lengths , plain or threaded ends , sizes from 8mm to 200mm and above , comes in 3 thicknesses

Question 8

What is medium grade mild steel used for?

Answer 8

Low pressure heating systems and gas installations

Question 9

What is heavy grade steel used for??

Answer 9

High temp hot water and heating systems also steam installation and acetylene gas

Question 10

What is schedule 40 & 80

Answer 10

Used in process industries 1-blue band. 32mm 2-red band 40mm 3-schedule 80 50mm

Question 11

What are the 3 ways of joining mild steel pipes??

Answer 11

Threaded joints using stocks and dies , welding joints using acetylene , victaulic joints using electric grooving machine

Question 12

What is a threaded joint?

Answer 12

BSPT this is a tapered thread that thightens when screwed together

Question 13

What are the two types of threaded joints?

Answer 13

A male external and a female internal

Question 14

What are the safety hazards on the electric threading machine?

Answer 14

Long hair, loose protective clothing, jewellery, rings, oils, spillages , wearing gloves, long pipe work rotating, resting on a moving machine,

Question 15

What are lubricants used for and when?

Answer 15

Used to cool and lubricate cutting die and work piece

Question 16

What are unions used for??

Answer 16

To allow final joints to be made or to facilitate removal,

Question 17

Name the 3 joints used when making a union ?

Answer 17

Hexagon Union / flanges / longscrew threads

Question 18

Where are flanges used?

Answer 18

In industrial installations where very large valves or controls may have to be replaced, they are fitted to the pipe BSP threads

Question 19

What is used between flanges?

Answer 19

The material used between flanges depends on what fluid the pipe is carrying INSERTION RUBBER is suitable for many appliances

Question 20

What type of gaskets can be used?

Answer 20

CAF gaskets and halite , spiral wound gasket , insertion rubber

Question 21

What is the name of the material is used for a plumber to make a gasket on site?

Answer 21

CAF GASKETS and halite

Question 22

Where is spiral wound gaskets used most commonly?

Answer 22

Gas

Question 23

How is victaulic joints made?

Answer 23

By cutting a single groove in the pipe which a steel clamp fits and a rubber washers are used to seal

Question 24

Where is victaulic joints used?

Answer 24

To fabricate fire fighting systems or large bore cold distribution systems

Question 25

Why is it essential to remove the burr? What will happen if not removed?

Answer 25

Reduction in heat carrying capacity / reduction in water flow delivery / noise creation / air formation n fresh water systems /

Question 26

What is used to remove burr?

Answer 26

A pipe reamer , a de-burring tool or a file

Question 27

What are the two ways to bend mild steel??

Answer 27

MACHINE BENDING/ HEAT BENDING

Question 28

What should be ensured when using a HYDRAULIC benders??3 things

Answer 28

The correct size inside former is attached / the 2 rear formers are in the correct place / ensure that the formers are turned to suit the pipe

Question 29

Where should the bending line be positioned for 90’ ?

Answer 29

The centre of the former

Question 30

What should be done to get the correct measurement for 90’ ?

Answer 30

Subtract the full inside diameter of the pipe

Question 31

To mark out a pipe to a given radius use this calculation

Answer 31

• ♊️x D ➗4 for 90’ bend - ♊️xD➗8for 45’ bend - ♊️xD➗6 for 60’ bend - ♊️xD➗12 for 30’ bend

Question 32

When preparing the pipe for sand bending it’s important to?

Answer 32

Use only clean dry sand / pack the pipe tightly a packing bar / ensure plug is a tight fit into reamed pipe / only bend when the pipe has reached an even dull red all the way round

Question 33

What will happen if u rush sand bending?

Answer 33

Buckling (incorrect heat) thinning (incorrect heat) ovality (sand not tight enough) uneven radius (under or over bending) incorrect radius (marked out wrong) heat marks (overheating)

Question 34

What must be done to pipe work going through a wall?

Answer 34

Sleeved or timber joists

Question 35

What can happen if pipe work is not supported properly??

Answer 35

Damage or failure under service conditions or faults such as air locks

Question 36

What should be considered when supporting pipe work?

Answer 36

Type of surface Which fixings are going into / the weight of the components to be fixed / what way it is been fixed for pipe runs and levels

Question 37

What’s the best material should clips be made from?

Answer 37

If possible the same material as the pipe or fitting