Student Book Answers

blondglibUrban and Civil

Nov 29, 2013 (3 years and 10 months ago)

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L2 Plumbing
Unit 5

C
arry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems

Student Book Answers




© Pearson Education Ltd 2011. Copying

permitted for purchasing institution only. This material is not copyright free.

1


Understand and carry out site preparation and
pipework fabrication techniques for domestic plumbing
and heating systems

Progress check 1

(page
207
)

1

What is the main disadvantage of buying cheap tools?

They are more likely to be damaged easily or to wear
out, because they are not
up to the job.

2

When using a large frame hacksaw to cut light
-
gauge tubes such as copper or
plastic, how many teeth per inch are recommended?

32 teeth per inch

3

Why is it necessary to de
-
burr a copper tube after tube cutters hav
e been used?

The internal wall of the tube will be misshapen, changing the internal bore of the
tube. This will affect the flow of water and encourage blockages to form.

4

Why is it important to ensure that teeth on pipe grips and wrenches are free from
th
e build
-
up of jointing compounds?

If they become clogged up, their grip will be weakened and the tool could slip.

5

What types of surface would a hammer drill be used on?

Concrete and masonry (brickwork, blockwork and stone)

6

What does the abbreviation PA
T stand for, and how often should this usually be
carried out on electrical equipment used on building sites?

Portable Appliance Testing; this should be carried out every three months
.

7

What essential piece of PPE must be worn when using electrical drills

and saws?

Eye protection must be wor
n

to protect the eyes from dust and splinters/swarf
which may fly off. A dust mask is also recommended when cutting wood
materials, particularly MDF.

Progress check 2

(page
230
)

1

Which grade of copper tube is the most
commonly used for general purposes?
Its temper is classified as half hard.

BS EN 1057


R250 Grade X


half hard lengths


L2 Plumbing Unit 5

Carry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems



© Pearson Education Ltd 2011. Copying permitted for purchasing institution only. Thi
s material is not copyright free.

2


2

Name the three common methods of jointing copper tube.

Compression joints, soldered joints and push
-
fit joints

3

Name the two types
of compression joint and soldered capillary joint.

Compression joints: manipulative (type B) and non
-
manipulative (type A)

Soldered capillary joints: end feed and integral solder ring

4

Which type of solder is not allowed on pipework for either hot or cold

water
supplies?

Any solder containing lead (leaded solder)

5

How many grades of LCS pipe are there? How are they classified and what
colours are used to refer to each one?

There are three grades: light (colour
-
coded brown), medium (colour
-
coded blue)
and
heavy (colour
-
coded red).

6

On smaller installations, what are the two main methods of jointing LCS pipe?

Threaded joints and compression joints

7

What is meant by the term ‘cabling technique’?

Cabling technique involves installing pipework in the same way

that an
electrician would install cabling: the pipework is installed through the joists from
the ceiling below the floor level, before the ceilings are erected.

8

Other than spring bending (internal/external) and machine bending, what is
another means of
successfully bending copper tube?

Sand
-
loaded heat bending

9

Why is over
bending necessary when using a hydraulic bending machine?

To allow the bend to spring back to the required angle when the pressure is
released

10


After using a hydraulic bending machi
ne, how should the former be removed
from the bent piece of LCS tube both correctly and safely?

Either place a timber block on the pipe and give it a sharp tap with a hammer; o
r

remove the pipe and former from the machine, place a wooden block on the
floor
, and strike the end of the pipe on the block. Hold onto the former so that it is
not damaged on the floor.

11

What will be the result if the pipework is not set up level in the machine
producing bends such as offsets?

The bend will be screwed or twisted.


L2 Plumbing Unit 5

Carry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems



© Pearson Education Ltd 2011. Copying permitted for purchasing institution only. Thi
s material is not copyright free.

3


Progress check 3

(page
239
)

1

When handing over an installation to a customer, what information should you
pass on, by hand or verbally?



Provide a company folder containing:

o

an emergency contact number for burst pipes etc.

o

a general advice line number


y
ou might be able to sort a problem out
over the phone

o

customer guidance leaflets that most manufacturers produce (go through
these with the customer when you hand them over)
.



Label the various fittings or components that the customer may need to use
in an
emergency (e.g. stop valve, gate valve, etc.)
.



Show them, or tell them, where the service valves are and what they do
.



Walk them around the system: show them the various components and tell
them what they can touch and what they must not touch. Explain wha
t the
components do in simple terms (e.g. ‘This is the cylinder thermostat. When
the water in the cylinder gets to that pre
-
set temperature, it shuts off the heat
to the cylinder. You don’t have to alter this setting.
’).



Give the customer the chance to ask

questions.



Leave the manufacturers’ installation and user instructions on the job for
future reference purposes.



Ensure that a full commissioning record is completed for the work: this is not
only good sense, it is also the law.

2

Produce a checklist of t
hings you need to do and be aware of when you are
preparing to start work.



Have you confirmed the start time and date with the client?



Are all the tools, materials and equipment required to do the job on site?



Are electrical tools safe to use?



Is the work
area clean and safe to work in?



If you are using access equipment (ladders etc.), is this safe to use?



If you are working in a loft, do you have adequate lighting to see what you
are d
o
ing (torch, inspection lamp etc.)?



If you are working in an occupied dw
elling, have you checked the work area
for any pre
-
work da
m
age? If you have noticed any damage, have you notified
the customer before starting work? This can be done using a pre
-
site
inspection report form or a statement given to the customer.



If you are w
orking in an occupied dwelling, have you protected the
customer’s property before beginning to work? (Use dust sheets, unless they
could be dangerous, e.g. on stairs.)



If you are working in a garden or in flower beds, lay down walking boards to
avoid damag
e.



Ask the client to remove any vulnerable furniture and take up the carpets if
necessary.



Cover up sanitary appliances if you are working in the bathroom area.


L2 Plumbing Unit 5

Carry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems



© Pearson Education Ltd 2011. Copying permitted for purchasing institution only. Thi
s material is not copyright free.

4


3

What is the purpose of a pipe guard?

This is fitted over the top of any joist which has been

drilled or notched, to
prevent damage to the hidden pipework from screws/nails which may be used in
the future.

4

The depth of a joist is 225

mm. What is the maximum depth of the notch
allowed?

28.125

mm (28

mm)

5

The span (length) of a joist is 3.1

metre
s. What is the maximum distance of a
notch away from the wall?

775

mm

6

What are the minimum and maximum distances from the wall at which a hole
may be drilled into a timber joist, when multiplied by the span?

Minimum distance: 0.25 multiplied by the span

Maximum distance: 0.4 multiplied by the span

7

Define the term ‘making good’.

Repairing and finishing off brickwork, blockwork, concrete etc.

Progress check 4

(page
245
)

1

Make a list of different fixing devices used to secure clips, brackets and sanitary
ware to the building fabric.



screws



brass wood screws



self
-
tapping screws



turn threaded wood screws



steel countersunk wood screws



chipboard screws



mirror screws



plastic plugs



plasterboard fixings



cavity fixings



nails

2

How are screws specified?

By their le
ngth (in inches) and their gauge (nominal diameter)


L2 Plumbing Unit 5

Carry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems



© Pearson Education Ltd 2011. Copying permitted for purchasing institution only. Thi
s material is not copyright free.

5


3

In which plumbing situations would you use a brass screw?

Where steel screws would be affected by moisture (e.g. securing sanitary ware);
externally (usually in alloy form, due to costs), for soil and
rainwater fixings and
wall
-
plate elbows for hose union bib taps.

4

Where would a mirror screw be used
on sanitary

appliance
s
?

Where appearance is important (e.g. fixing wooden or plastic bath panels); some
plumbers use these to finish off the screw heads w
hen making fixings to secure
a WC pan

5

Which masonry drill bit size would be required to prepare a hole for a brown
plastic plug?

7

8

mm

6

What is the disadvantage of using a spring or gravity toggle type plasterboard
fixing?

The toggle will be lost in th
e cavity if the equipment/component ever needs to be
removed.

Progress check 5

(page
249
)

1

Define the term ‘prefabrication’.

Prefabricated pipework is pipework which has been bent to shape before it is
fixed in position. This bending is carried out away f
rom the actual installation
premises.

2

Define the term ‘in
-
situ’.

A Latin phrase meaning in

the original position or place

3

List three reasons why pipes are ‘sleeved’.



To reduce the effects of expansion/contraction on wall surfaces



To protect pipework fr
om corrosion



To prevent gas leaking into a cavity

4

What are the British Standard colour codings for pipes?



Cold water service pipes: blue



Domestic natural gas pipes: yellow



Central heating pipework for use in solid floors: white

5

Explain the term ‘first
fix’.

The first fix involves installing all pipework before the floor covering goes down
and plasterboard is finished (sometimes referred to as carcassing).


L2 Plumbing Unit 5

Carry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems



© Pearson Education Ltd 2011. Copying permitted for purchasing institution only. Thi
s material is not copyright free.

6


6

Explain the term ‘second fix’.

The second fix is the completion of the installation


fitting th
e bathroom suite,
other sanitary appliances or radiators.

Progress check 6

(page
2
5
2
)

1

Which British Standard provides the standard for soundness testing on hot and
cold water systems?

BS 6700

2

What means is there of soundness testing, other than the use

of water?

Air testing

3

What should soundness testing of a hot
-

or cold
-
water system include?



visual inspections



testing for leaks



pressure testing



final checks

4

How many test procedures are there for plastic installations of hot
-

and cold
-
water supplies
, as stated in BS 6700 and the Water Regulations?

Two


Test A and Test B

5

What should be done after the system soundness checks have been completed
with regard to hot
-

and cold
-
water supply systems?

The system should be thoroughly flushed out to remove a
ny debris or swarf.
There should then be a final visual check for leaks.


L2 Plumbing Unit 5

Carry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems



© Pearson Education Ltd 2011. Copying permitted for purchasing institution only. Thi
s material is not copyright free.

7


Check your knowledge

1

Which of the following statements
means

a fixed price that a plumber’s merchant
will supply material for?

a

Quotation

b

Estimate

c

Specification

d

Invoice

2

Wh
ere
would

details of the quantity of materials available for use on site

be
found
?

a

Stock control

b

Security

c

Bill of quantities

d

Site meeting

3

When notching joists for pipework, what depth can you remove, according to the
Building Regulations?

a

4
1

of the depth of the floor joist

b

5
1

of the depth of the floor joist

c

6
1

of the depth of the floor joist

d

8
1

of the depth of the floor joist

4

Which type of fixing should b
e used

to fix a wash hand basin to a plaster partition
wall?

a

Plastic plug

b

Coach bolt

c

Masonry nails

d

Toggle type fixing

5

Hydraulic levels must be checked regularly. What
item is used

to check these
levels?

a

Threading machine

b

Pillar drill

c

Electr
ical saw

d

Steel pipe bender

6

Which of the following is
not

a type of machine bend?

a

Offset

b

Passover

c

Square

d

Overtake


L2 Plumbing Unit 5

Carry out site preparation and pipework fabrication techniques for domestic plumbing and heating systems



© Pearson Education Ltd 2011. Copying permitted for purchasing institution only. Thi
s material is not copyright free.

8


7

When
should a joist

not

be
drilled

or notch
ed
?

a

When you have a headache

b

In a modern constructed dwelling

c

If the joints are

too thick

d

If the work will disturb others

8

On

a scaled drawing, what
should be

use
d

to calculate the actual size of things?

a

A ruler

b

A tape measure

c

A scale ruler

d

A piece of string

9

Which of the following documents
are used

in the plumbing indus
try?

a

Water Regulations

b

Building Regulations

c

British Standards

d

All of the above

10

What grade of copper pipe is best suited to
being bent

using an internal bending
spring?

a

X

b

W

c

Z

d

Y

11

What is the recommended clipping distance for a vertical 1
5 mm copper pipe?

a

2

m

b

1.8

m

c

1.6

m

d

1.2

m

12

What is the name of the tool used to hand thread low carbon steel pipe?

a

Stock and dies

b

Stocks

c

Dies

d

A pipe vice

13

What is the recommended size drill bit for a screw with a gauge of 8

10?

a

5

mm

b

6

mm

c

7.8

mm

d

10

mm