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HIP! MAGAZINE JANUARY 2015 ISSUE

ANSWERS TO PAGE 16: LEVEL 2 PLUMBING: HOT WATER

1. A direct hot water cylinder is usually found attached to which type of fuel source?

A Solid fuel

B Solar thermal

C Gas boiler

2. What does an indirect cylinder have inside?

A Nothing

B A heat exchanger

C Immersion heater

3. The primary flow and return connect the cylinder to what?

A Source of heat

B Appliances

C Radiators

4. A single feed hot water system will have how many cisterns?

A Two

B One

C None

5. The open vent/expansion pipe from the hot water cylinder terminates over which cistern?

A Feed and expansion

B Outside

C Cold water storage cistern

 

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6. What is the heat exchanger designed to do inside a cylinder?

A Keep the stored and primary water separate

B Mix the stored water and water from source

C Allow for water expansion

7. According to which Building Regulation does a hot water storage vessel have to be insulated?

A Part G

B Part H

C Part L

8. Which of the following is a centralised heat source?

A Single point water heater

B Multipoint water heater

C Thermal store

9. If you were installing a cylinder that has a capacity of 300 litres, how big should the cistern be?

A At least the same size as the cylinder

B 100 litres

C 230 litres

10. What type of cylinder would need to be installed if a property had a gas central heating boiler and a solar thermal system installed?

A single coil indirect

B dual coil indirect

C direct

 

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ANSWERS TO PAGE 18: LEVEL 2 PLUMBING: HOT WATER

1. What is the main advantage of a combination unit?

It takes up less room and costs less to install.

2. What could be a possible disadvantage of the combination unit?

Pressure can be low at hot water outlets.

3. If a cylinder has a heat exchanger (coil) which type of cylinder is it and what does the heat exchanger do?

Indirect and heats the water.

4. On an indirect hot water supply where does the source of heat get its water from?

The feed and expansion cistern.

5. The hot water distribution pipe needs to be how many millimetres away from the cylinder running horizontally before allowing a vertical rise?

450mm.

6. Which type of float-operated valve would you expect to install in cold water storage cistern and which BS number does it comply with?

A part 2 float operated valve and complies with BS1212.

7. When renewing a cylinder, which type of valve would isolate the cylinder and which pipe would you find it on?

Wheel headed gate valve found on the cold feed from cistern to cylinder.

8. If a distribution pipe on the hot supply to appliances was over 12m in length what measures would you need to put in place to comply with Part L?

 

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Secondary circulation circuit.

9. There is a three-tiered protection system on an unvented cylinder, can you name the components that make up this three tiered protection?

Control thermostat, high limit thermostat and a pressure relief valve.

10. How many sources of heat for a domestic hot water system can you name?

Immersion heater, gas boiler, solar collectors, solid fuel, ground source heat pumps and air source heat pumps to name but a few.

ANSWERS TO PAGE 19: LEVEL 2 PLUMBING: SANITATION

1. The purpose of a trap attached to an appliance is to

A Allow waste to flow freely

B Prevent foul air entering the building

C Prevent blockages in the system

2. You have been asked to install a bathroom suite, the waste pipe work was all in lead. Which has been removed, when connecting the bath waste to the appliance, which size of trap would be installed and what is the minimum trap seal depth?

A Trap size 40mm, depth of 50mm

B Trap size 32mm, depth 75mm

C Trap size 40mm, depth of 100mm

3. What should be avoided in the ‘wet’ portion of a stack?

A Offset bends

B Rodding eyes

C Strap on boss

 

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4. When checking for trap seal depth, what depth of water should be retained in a trap?

A 50mm

B 75mm

C 25mm

5. Where would information on maximum lengths of waste pipes be found?

A Document B

B Document L

C Document H

6. When carrying out an air test what amount of positive pressure should the pipework be able to withstand?

A 75mm water gauge

B 50mm water gauge

C 38mm water gauge

7. Document H states the maximum lengths for branch discharge pipes, what is the maximum length for 32mm waste pipe?

A 1700mm

B 1800mm

C 1900mm

8. What must be done if this length is exceeded?

A No action to be taken if it is +/- 50mm

B Fit another trap in the discharge pipe

C Increase the size of the discharge pipe

 

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9. On which appliance would you expect to find a slotted waste and what size trap would be attached?

A Kitchen sink 40mm

B Wash hand basin 32mm

C Bath 40mm

10. All sanitary pipework that has a condensate pipe connected to it should have a resistance to water of which ph value or less?

A 7

B 8.5

C 6.5

ANSWERS TO PAGE 19: LEVEL 2 PLUMBING IDENTIFICATION

Here are a number of components that you will find on a plumbing/heating system. Can you name them and what they’re used for?

Name- under floor heating manifold

Function- used to pump the under floor heating circuit

 

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1)

§

Name- filling loop

Function- used to fill a sealed heating system

 

Name- combination/composite valve

Function- used on the cold mains supply to fill an unvented hot water

 

 

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Name- slotted waste

Function- connects wash hand basin to waste pipe

 

Name- vent key

Function- used to remove trapped air from radiators

 

Name- ceramic disc tap insert replacements

Function- in maintenance of taps

 

 

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ANSWERS TO PAGE 22: LEVEL 2 PLUMBING: CENTRAL HEATING SYSTEMS

Component name Description Use Circulating pump Can be made of steel or

bronze, with pump valves attached for isolation purposes

To circulate water around a hot water or central heating system

Two port motorised valve

An on off device that operates when powered by a thermostat

To zone off a certain area of a hot water or central heating system

Three port mid position valve

An on off device that operates when powered by a thermostat

To isolate either the hot water or central heating

Automatic air vent An automatic device to release air at the high points on systems

Used to vent air from a central heating system

Pressure relief valve A safety device to keep the pressure of a system constant

Used to release excess water pressure from a system

Room thermostat A device that senses ambient air temperature

To operate the pimp or motorised valve on a system

Thermostatic radiator valve

A device that reacts to the water temperature

Provide individual control to each radiator on a system

Expansion vessel A device used on systems that are not open to atmospheric pressure

Allows water to expand by compressing air

Cylinder thermostat A device that controls stored hot water temperature

Controls either the two port or where a mid-position valve will open or close

Combination boiler A device that supplies both hot water and heating to a property

Heats up central heating when programmed or requested and water instantaneously

 

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ANSWERS TO PAGE 24-28: LEVEL 2 PLUMBING: SPOT THE MISTAKE

3. Hole drilled is too large.

5. Grips should not be used on flat nuts, adjustable is correct tool.

6. Hole is not deburred.

8. Signs of damage to cistern where hole saw has slipped and hole diameter drilled too big.

9. Signs of damage to cistern where hole saw has slipped and hole diameter drilled too big.

16. The cistern is now dressed, as part of the kit supplied you will also have the lid and the jacket to fit when the cistern has been filled and checked. The location of the cistern must adhere to the following;

• Loft insulation removed from under the cistern • Cistern to be supported under its entire base using tongue and groove

boarding or marine ply. Not chipboard and resting on a minimum of 3 joists with at least 150mm protruding around all sides of the cistern

• Installed with at least 350mm from roof to allow for maintenance

17. The FOV will be connected to the rising main via a Service valve to allow maintenance of the FOV.

ANSWERS TO PAGE 30-32: LEVEL 2 PLUMBING: CENTRAL HEATING COMPONENT IDENTIFICATION

1

2

A  secondary  return  pump  

B  central  heating  pump    

C  combination  valve      

A  room  thermostat  

B  frost  thermostat    

C  cylinder  thermostat    

 

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3

4

5

6

A  thermostatic  radiator  valve  

B  line  strainer    

C  two  port  motorised  valve      

A  expansion  vessel  

B  pressure  reducing  valve  

C  gas  bottle    

A  frost  thermostat  

B  cylinder  thermostat    

C  room  thermostat    

A  bypass  valve  

B  mid  position  valve  

C  two  port  valve    

 

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7

8

9

10

A  pressure  relief  valve  

B  bypass  valve  

C  pressure  reducing  valve    

A  three  port  motorised  valve  

B  two  port  motorised  valve  

C  float  operated  valve    

A  conventional  boiler  

B  bio  mass  boiler  

C  combination  boiler  

A  float  operated  valve  

B  expansion  vessel  

C  automatic  air  vent  

 

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ANSWERS TO PAGE 34: LEVEL 2 PLUMBING: CENTRAL HEATING SYSTEMS

1. What is a filling loop used for?

A Draining down a system

B Filling up a central heating system

C As a bypass valve

D Emergency use

2. What temperature would a cylinder thermostat be set at?

A 80-85

B 90-95

C 60-65

D 40-50

3. An S plan system would feature which motorised valve?

A Two port

B Three port

C Simplicity valve

D Wheel head gate valve

4. A Y plan system would feature which motorised valve?

A Two port

B Simplicity valve

C Three port

D Gate valve

 

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5. Where would a room thermostat be ideally located?

A Living room

B Hall

C Bathroom

D Biggest room

6. A frost thermostat works in conjunction with

A Room thermostat

B Pipe thermostat

C Pump

D Radiator

7. What component features on a central heating system that joins all of the controls together?

A Programmer

B Time clock

C Wiring centre

D Boiler thermostat

8. What is the nominal capacity for a feed and expansion cistern?

A 18 litres

B 110 litres

C 230 litres

D 1000 litres

 

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9. On a double feed indirect hot water system, where does the water for the central heating come from?

A Cold water storage cistern

B Cylinder

C Filling loop

D F & E cistern

10. If a customer comments that the radiator in the living room is cold at the top, what could be the problem?

A Air in radiator

B Circulator not working

C Faulty radiator valve

D Poor water pressure

ANSWERS TO PAGE 36: LEVEL 3 PLUMBING: DOMESTIC HEATING SYSTEMS

1) Which method of piping up to radiators is the most effective for heat output? a) Bottom opposite ends b) Top and bottom same end c) Top and bottom opposite ends d) It makes no difference

2) The main method of heat transfer from underfloor heating is?

a) Convection b) Radiation c) Conduction d) Induction

3) Which radiator circuit is used first when balancing a heating installation?

a) Nearest radiator circuit b) Downstairs radiator circuit c) Upstairs radiator circuit d) Index radiator circuit

 

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4) When would a low loss header be installed a) To prevent thermal shock within the heat source b) To prevent thermal shock within the heat emitters c) To allow for expansion in the pipework d) To provide higher operating temperatures

5) When should a heating system be divided into two zones?

a) When the floor area exceeds 150m2 b) When the floor area exceeds 140m2 c) When the floor area exceeds 125m2 d) When the floor area exceeds 100m2

6) Where should the sensor for an optimiser be fitted?

a) Next to the boiler b) On the South facing outside wall c) On the North facing outside wall d) Within 3 metres of the wiring centre

7) A condensing boiler with a heat output of 35 kilowatts requires which

diameter of copper flow and return pipes? a) 22mm b) 28mm c) 35mm d) 42mm

8) What temperature should the floor temperature not exceed on an

underfloor heating installation? a) 29oC b) 35oC c) 55oC d) 70oC

9) What does DER stand for?

a) Design CO2 Emission Rate b) Design CO2 Environmental Rating c) Dwelling Environmental CO2 Rating d) Dwelling CO2 Emission Rate

10) What type of new heating system should you install? a) Reverse return b) Fully pumped c) Sealed d) Semi Gravity

 

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ANSWERS TO PAGE 36: LEVEL 3 PLUMBING: SANITATION

1. When planning to install any drainage or sanitary appliances/pipework which building regulation approved document should be adhered to?

A Part B

B Part L

C Part H

D Part P

2. In addition to the above mentioned approved document which other approved document should be consulted with regard ventilation?

A part L

B part A

C part G

D part F

3. The layout, arrangement of the sanitary fittings and facilities should be determined by?

A Number of people using the facility

B Dimensions of the body, allowing for an activity space, room to move

C Size and access to the component/appliance

D All of the above

4. In which year was part G amended?

A 2010

B 1999

C 2002

D 2012

 

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5. What type of trap seal loss is described here; caused by wind passing over the top of the ventilation pipe, bringing about pressure fluctuations; thus causing trap seal loss?

A Compression

B Wavering out

C Induced siphonage

D Self siphonage

6. What type of trap seal loss is described here; mostly caused in wash hand basins due to their funnel shaping they discharge their contents quickly which leads to a plug of water creating a vacuum in the pipe?

A Self siphonage

B Compression

C Induced siphonage

D Wavering

7. What type of trap can be installed to overcome self siphonage?

A bottle trap

B Resealing trap

C Running trap

D P trap

8. When deciding on the size of the vertical discharge stack, what method should be used to calculate this size?

A General rule of thumb

B U value

C Discharge unit values

D Discharge performance testing chart

 

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9. What depth of trap seal should you expect to find remaining in a trap after use?

A 25mm

B 35mm

C 20mm

D 40m

10. What would a gulley grab be used for?

A Installation of a gulley grating

B Removal of a gulley grating

C Clearing of debris inside a gulley trap

D Testing a gulley trap seal depth

ANSWERS TO PAGE 40: LEVEL 3 PLUMBING: SANITATION

Symptom Causes Remedy The motor does not work

The electrical supply is not on. The electrical supply is faulty. The motor is defective.

Turn on Check power supply Faulty part associated with motor, i.e. micro switch.

The motor is noisy and does not run

Foreign object inside the box.

Remove the foreign body

The motor only works every now and again (intermittently)

The connected sanitary appliances are passing/dripping water The non-return valve is faulty

Check installation upstream. Clean or replace.

The motor continues to run for a long time

The length or height is over specification, or there are too many elbows/bends

Check the installation.

Water in pan goes down very slowly

The air dispenser is clogged up. Problem with the motor.

Clear the air relief hole. Check the pump.

 

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ANSWERS TO PAGE 42: LEVEL 3 PLUMBING: DOMESTIC SANITATION SERVICES

1) Air admittance valves should comply with which of the following documents? a) BS-EN 12056 b) BS 6465 c) BS-EN 12380 d) BS 8000

2) Which document will give you information on the space requirements

for sanitary appliances? a) BS-EN 12056 b) BS 6465 c) BS-EN 12380 d) BS 8000

3) Which document gives guidance for designing sanitary conveniences for wheelchair users? a) Building regulations Approved Document H b) Building regulations Approved Document P c) Building regulations Approved Document M d) Building regulations Approved Document A

4) In accordance with BS5465 the typical activity space for a bath is?

a) 1700mmx800mm b) 1700mmx900mm c) 1700mmx500mm d) 1700mmx 600mm

5) What size cesspool would be installed for a property with 5 occupants? a) 24,800 litres b) 18,000 litres c) 31,600 litres d) 38,400 litres

6) When calculating the sizes of soil stacks which of the following will affect the outcome? a) Frequency that the appliances are used b) Fall of pipework throughout the installation c) Type of pipework used in the installation d) Pipework jointing methods used in the installation

 

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7) Which is the first action when commissioning an above ground discharge system? a) Carry out a hydrostatic test b) Test trap retention with a performance test c) Carry out a visual inspection of the installation d) Carry out a soundness test using air

8) In accordance with building regulations approved Document H a roof

with an effective area of 58m2 would have what size half round gutter fitted? a) 100mm b) 115mm c) 125mm d) 150mm

9) Which of the following is used to waterproof the building fabric in a walk in wetroom? a) Tanking membrane b) Marine grade plyboard c) Waterproof tile adhesive and grout d) Latex tape

10) What is the most effective way to identify a fault on a mascerator

prior to undertaking a detailed investigation? a) Look in the appliance service record b) Visually inspect the unit c) Phone the manufacturers d) Ask the customer

ANSWERS TO PAGE 44: LEVEL 3 PLUMBING: HOT WATER SYSTEMS

1) According to BS 6700 how much hot water storage should be provided for a property that has 6 people? a) 275 litres b) 340 litres c) 290 litres d) 260 litres

2) What is the temperature that hot water should never exceed?

a) 100oC b) 95oC c) 90oC d) 85oC

 

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3) In accordance with Building Regulations Approved Document G what is the maximum temperature delivered to a bath? a) 38oC b) 65 oC c) 48 oC d) 55 oC

4) In accordance with Building Regulations Approved Document G when installing an unvented Hot water cylinder the maximum length of the D1 pipework is? a) 500mm b) 600mm c) 750mm d) 300mm

5) In accordance with Building Regulations Approved Document G the

distance from the tundish to the first bend should be a minimum of? a) 500mm b) 600mm c) 750mm d) 600mm

6) A G ½ temperature relief valve with a D2 Discharge Pipe with a length of

10 metres has 2 bends and 3 elbows. In accordance with Building Regulations Approved Document G the diameter of the D2 pipework should be a minimum of? a) 22mm b) 28mm c) 32mm d) 42mm

7) A typical increase in volume of water for a 250 litre hot water cylinder would be? a) 5 litres b) 10 litres c) 12 litres d) 14 litres

8) The type of thermostatic mixing valve (TMV) required for a hospital would be a? a) Buildcert TMV1 b) Buildcert TMV2 c) Buildcert TMV3 d) Buildcert TMV4

 

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9) The high limit thermostat (ECO) fitted to an unvented cylinder would operate at? a) 60oC b) 65oC c) 80oC d) 90oC

10) If an unvented system discharges water through the pressure relief

valve when hot, but not cold, what is the likely fault? a) Pressure relief valve is defective b) Expansion valve diaphragm is split c) Expansion valve is too large for the installation d) Pressure relief valve needs adjusting to a higher pressure

ANSWERS TO PAGE 45: LEVEL 3 PLUMBING: COLD WATER SYSTEMS

1) What category of water is harvested rainwater classified as? a) Category 1 b) Category 2 c) Category 4 d) Category 5

2) According to BS 6700 how much cold water storage should be provided for a property that has 6 people? a) 450 litres b) 480 litres c) 500litres d) 524 litres

3) How much chlorine (ppm) should a system be dosed for disinfection? a) 30 ppm b) 40 ppm c) 50 ppm d) 100 ppm

4) When would disinfection occur? a) New installation in a private dwelling b) Minor extension c) Rented property between lets d) Major extension

5) What fluid category risk is a commercial washing machine? a) Category 2 b) Category 3 c) Category 4 d) Category 5

 

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6) What is the minimum fluid category risk for a mini irrigation system?

a) Category 2 b) Category 3 c) Category 4 d) Category 5

7) A mains fed sprinkler system with additives would require which protection device? a) Single check valve b) Double check valve c) BA (RPZ) valve d) Type DB interrupter

8) Which type of float operated valve is most suitable for a CWSC? a) BS1212 Part 1 b) BS1212 Part 2 c) BS1212 Part 3 d) BS1212 Part 4

9) What must you ensure when fitting 1inch globe taps on a bath?

a) An minimum air gap of 20 mm b) An minimum air gap of 25 mm c) An minimum air gap of 70 mm d) A single check valve is fitted as a minimum

10) How many loading units does a DN15 ½” sink have? a) 5 b) 4 c) 3 d) 1.5

ANSWERS TO PAGE 46-47 LEVEL 3 PLUMBING: ORGANISING RESOURCES WITHIN THE BUILDING SERVICES INDUSTRY

1) Who is the architect’s agent on large sites? a) Clerk of Works b) Contract manager c) Quantity surveyor d) Civil engineer

 

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2) Which of the following cannot be changed once the client has accepted it? a) Estimate b) Quotation c) Delivery notice d) Work programme

3) An apprentice should?

a) Work under the supervision of a qualified plumber at all times

b) Be able to plan their own workload c) Work under minimal supervision d) Be able to work alone for short periods of time

4) On a large construction site, the work programme for all trades, tasks and building plots would normally be produced on a? a) Pie chart b) Simple bar chart c) Gantt chart d) Bridge chart

5) Who produces a “Bill of Quantities” on behalf of the architect?

a) Procurement officer b) Clerk of works c) Estimator d) Quantity surveyor

6) How is a risk level calculated? a) Likelihood x Risk b) Consequence x Hazard score c) Likelihood x Consequence d) Consequence X Risk

7) You have won a contract with a management agent to work in a large

rented house. What type of customer are they? a) Private b) Contracting c) Internal d) Service

8) How would you gain authorisation to make alterations to the job specification? a) Phone the client b) Meet with the architect to discuss the problem c) Do the alterations as you are the specialist d) Get a variation order

 

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9) On a site with a deadline for completion, what would the most likely consequence of falling behind schedule would be? a) Increased materials cost b) Increased delivery charges c) Increased labour costs d) Increased cost effectiveness

10) Who should be allowed to use a core drill? a) An apprentice b) A worker who is competent and trained c) Any worker over 21 years old d) A level 2 qualified plumber