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WorksheetsHeating Commissioning L3
Total questions: 72
Worksheet time: 36mins
What is probably the most important aspect of any heating installation?
The design of the system
The testing and commissioning of central heating systems
The installation of pipes
The selection of radiators
At what point can we test to see if the installed system is leak-free and performs according to the requirements of the design?
At the point of testing and commissioning.
During the initial design phase.
After the system has been in operation for several years.
Before any installation work begins.
Correct commissioning procedures are laid down by ________ and manufacturer's instructions.
industry standards
local authorities
site engineers
project managers
Commission central heating systems and components True or False: The correct commissioning procedures must be adopted if problems are to be avoided.
True
False
Which regulation must be consulted during the commissioning process for central heating systems? Fill in the blank: The ________ (Water Fittings) Regulations 1999.
Water Supply
Gas Safety
Building Control
Electrical Safety
Which British Standards must be consulted during the commissioning process for central heating systems? Fill in the blank: British Standard ________, BS EN 12831, BS EN 14336 and BS 7593.
BS EN 12828
BS EN 10226
BS EN 13501
BS EN 14501
Which Building Regulations documents must be consulted during the commissioning process for central heating systems? Fill in the blank: The Building Regulations Approved Document ________ and ________.
L1A and L1B
G1 and G2
F1 and F2
E1 and E2
Which compliance guide must be consulted during the commissioning process for central heating systems? Fill in the blank: The ________ Building Services Compliance Guide.
Domestic
Commercial
Industrial
Residential
What instructions must be consulted during the commissioning process for central heating systems? Fill in the blank: The manufacturer's instructions of any ________ and ________.
equipment and appliances
pipes and valves
wires and switches
controls and sensors
Inadequate commissioning, system flushing and maintenance operations can affect the performance of a central heating system, irrespective of the materials used in the installation.
True
False
What can building debris and swarf (pipe filings) cause in central heating systems?
Improve water flow
Block pipes and promote bacteriological growth
Reduce corrosion
Increase efficiency
Excess flux used during the installation of central heating systems can cause _______.
corrosion
leakage
blockage
overheating
Fill in the blank: When performing visual inspections in plumbing, you should check that feed and expansion cisterns are ________ correctly.
supported
painted
measured
covered
Fill in the blank: During visual inspections, ensure that all appliances isolation valves and taps are ______.
off
on
open
locked
Fill in the blank: Visual inspections require checking that energy supplies are safely _______.
isolated
connected
measured
activated
Fill in the blank: These can be turned on and tested when the system is filled with _______.
water
air
oil
steam
According to the passage, at what pressure is the initial system fill always conducted?
High pressure
Low pressure
Normal operating pressure
Variable pressure
What type of water must the system be filled with, as stated in the passage?
Fluid category 2 water
Fluid category 1 water
Rainwater
Distilled water
Filling the system in stages allows operatives time to check for ______ stage by stage. Only when the stage being filled is leak-free should the next stage be filled.
leaks
pressure
temperature
valves
Once the cylinder and pipework system has been filled with water, it should be allowed to ______ and any float operated valves should be allowed to shut off.
stabilise
overflow
freeze
leak
After the filling process is complete, what should take place according to the passage?
Pressure increase
Visual inspection to check for any possible leakage
Immediate use of the system
Addition of chemicals
Why are airlocks from cistern-fed supplies less likely to occur?
Because the system is filled quickly
Because each stage is filled slowly and methodically
Because the system is never filled to capacity
Because gate valves are always closed
What is the best way to avoid airlocks when filling cisterns?
Fill cisterns halfway and open gate valves
Allow cisterns to fill to capacity and then open gate valves
Open gate valves before filling cisterns
Fill cisterns quickly without opening gate valves
Trickle filling can encourage ________ to form, causing problems later during the fill stage.
airlocks
bubbles
sediment
leaks
Any problems during the filling process can be assessed and rectified without the need to isolate the whole system and initiate a full drain-down.
True
False
What does opening gate valves after cisterns are filled to capacity ensure?
The pipes are running at full bore and the full pressure of water is available
The system is isolated
Airlocks are formed
The water pressure is reduced
On very large heating zones and circuits, what can help installers to effectively communicate during the filling process and isolation of a potential problem?
Mobile phones
Two-way radios
Written notes
In large systems, where should installers be stationed to initiate a prompt isolation should a problem occur?
At the main isolation and drain-off points
At the system control panel
Near the equipment storage area
At the administrative office
When the system has been filled with water, what should be allowed to shut off?
Any float-operated valves on feed and expansion cisterns
The main stopcock
The drain valve
The pressure relief valve
Filling and venting systems: An indirect system will then be deemed to be at ______ operating pressure.
normal
high
low
maximum
Filling and venting systems: A sealed system should be filled in accordance with the manufacturer's instructions, commonly directly from the mains via a ______.
filling loop
expansion vessel
pressure gauge
drain valve
Once the filling process is complete, what should take place to check for any possible leakage?
Pressure testing
Visual inspection
Chemical analysis
Temperature measurement
According to the British Standard BSEN14336, what must be tested during the soundness test of a heating system?
Water temperature
Watertightness and leakage
Pipe material
Water color
The system must be filled with fluid category ___ water directly from the water undertaker’s mains cold water supply.
1
2
3
5
Is it usual to conduct the fill in stages so that the filling process can be managed comfortably?
True
False
Before soundness testing a cold water system, visual inspections of the installation should take place. Which of the following should be included in the inspection?
A) Walking around the installation to check if it meets installation standards
B) Ignoring open ends and valves
C) Leaving capillary joints unsoldered
D) Not checking equipment for watertightness
Before soundness testing a cold water system, visual inspections of the installation should take place. Fill in the blank: One of the inspection steps is checking that all open ends are ________ off and all valves are ________.
capped; isolated
open; closed
sealed; open
covered; locked
Before soundness testing a cold water system, visual inspections of the installation should take place. All capillary joints should be soldered and all compression joints should be fully tightened during inspection.
True
False
Before soundness testing a cold water system, visual inspections of the installation should take place. What should be checked to ensure that all pipework is secure?
Check that enough pipe clips, supports and brackets are installed.
Check that the water pressure is above normal levels.
Check that the pipework is painted with anti-corrosive paint.
Check that the pipework is made of copper only.
Before soundness testing a cold water system, visual inspections of the installation should take place. True or False: All joints and unions on and around equipment such as cylinders, circulators, and pressure vessels should be watertight.
True
False
Soundness testing procedures: Before the test is conducted, what should be carried out?
Risk assessment
Pressure release
Equipment cleaning
Permit to work
Pressure testing involves stored energy, the possibility of blast and the potential hazards of high-velocity ______ formation due to pipe fracture and fitting failure.
missile
liquid
vapor
bubble
What should be adopted to ensure safety during soundness testing procedures?
Safe system of work
Quick completion
Minimal supervision
No protective equipment
Soundness testing procedures: Personal protective equipment (PPE) should also be used during soundness testing procedures.
True
False
Before testing, which factor should be carefully considered?
Is the test being used appropriate for the service and the building environment?
Is the test result always positive?
Is the test performed only during the night?
Is the test only for residential buildings?
Before testing, the following factors should be carefully considered.
Will it be necessary to divide the vertical pipework into sections to limit the pressures in multi-storey buildings?
Yes, to limit pressures in multi-storey buildings.
No, it is never necessary.
Only for single-storey buildings.
Only if the pipework is horizontal.
Before testing, the following factors should be carefully considered. Will the test leave pockets of water that might cause frost damage or corrosion later?
Yes, it might leave pockets of water causing frost damage or corrosion.
No, there is no risk of water pockets causing damage.
Only if the test is performed in cold weather.
Only if the equipment is made of metal.
Before testing, the following factors should be carefully considered. Can all valves and equipment withstand the test pressure? If not, these will need to be removed and temporary pipework installed.
Valves and equipment not able to withstand test pressure must be removed and temporary pipework installed.
All valves and equipment should be left in place regardless of test pressure.
Test pressure should be ignored during equipment testing.
Valves and equipment should be replaced with permanent pipework if they cannot withstand test pressure.
There are enough operatives available to conduct the test safely.
Yes, there are enough operatives available.
No, there are not enough operatives available.
Only a few operatives are available.
Operatives are not required for the test.
Different services can be interconnected as a temporary measure to enable simultaneous testing.
Yes, they can be interconnected temporarily.
No, they cannot be interconnected.
Only permanent interconnections are allowed.
Simultaneous testing is not possible with interconnections.
How long will it take to fill the system using the available water supply?
1 hour
2 hours
30 minutes
4 hours
The test should be started when the size of the system is considered.
At the beginning of the development process
After the system is fully developed
When the system reaches a testable size
Only after deployment
Preparation should also be taken into account.
Preparation should be considered.
Preparation is not necessary.
Preparation can be ignored.
Preparation is optional.
According to the soundness testing procedures, when can pressure testing commence?
Before the initial fill to test pipework integrity
After the initial fill to test pipework integrity has been completed
During the installation of pipework
After the system is in operation
Fill in the blank: Regulation 12 of the UK Water Regulations requires that the water system should be capable of withstanding an internal water pressure not less than ____ times the maximum pressure to which the installation or any relevant part is designed to be subjected in operation.
1 ½
2
1
2 ½
After testing, a careful ______ should be kept of the test carried out.
record
plan
guess
summary
According to Regulation 12, what must be satisfied for a water system that does not contain elastomeric (plastic) pipe?
The system must be subjected to the test pressure by pumping (1/2 operating pressure) and continue for one hour without further pumping and without any visible leakage and any pressure loss.
The system must be tested for five minutes only.
The system must be tested with full operating pressure.
The system must be tested with air only.
Name one of the tests for elastomeric pipes (e.g. polybutylene) mentioned in the pressure testing procedures.
test A
test B
test C
test D
Name the second test for elastomeric pipes (e.g. polybutylene) mentioned in the pressure testing procedures.
test B
test A
test C
test D
What is the initial pressure to which the system should be raised when slowly filling it with water?
0.5 bar
1 bar
2 bar
1.5 bar
If the pressure drops during the initial period, what should be done?
Ignore the drop
Re-pump the pressure to 1 bar
Increase the pressure to 2 bar
Release all pressure
After 45 minutes, the pressure should be increased to ______ times the normal operating pressure and the system should stand for 15 minutes.
1.5
2.0
1.2
0.8
The pressure in the system should be released to 1/3 of the previous pressure and let stand for a further 45 minutes.
True
False
Soundness testing – test A Test type A The test is considered successful if there are no ______.
leaks
cracks
holes
vibrations
What is the first step in the soundness testing procedure for test type B?
Fill the system with air
Slowly fill the system with water
Check for leaks
Increase the temperature
How long should the pressure be maintained before noting the pressure in test type B?
10 minutes
30 minutes
60 minutes
120 minutes
After the initial 30 minutes and noting the pressure, what should be done next in the test procedure?
Continue testing with increased pressure
Stop the test
Continue with no further testing and check the pressure after a further 30 minutes
Release the pressure
Fill in the blank: The test is successful if the pressure loss is less than ____ kPa (0.2 bar).
20
10
50
100
If the pressure loss is less than 60kPa (or 0.6 bar), what does this indicate about the system?
The system has visible leakage
The system has no visible leakage
The test is unsuccessful
The pressure must be increased
What is the purpose of cold flushing in plumbing?
To remove excess jointing compounds
To check for leakage
To remove debris left over from the installation process
To separate oils from pipework
Fill in the blank: After the system has been soundness tested, filled with water and checked for leakage, the system should be ______ and completely emptied.
drained
heated
painted
sealed
What does hot flushing remove from the system after installation?
Water
Debris
Jointing compounds, flux residues, and oils
Air
