NEW
Font size
Worksheetsuk Gas Pipework Practice Questions (vipergas)
Total questions: 28
Worksheet time: 14mins
What type of pipework material is mandatory for use inside a building?
Lead or alloy pipes
Any approved material
Non-metallic plastics
Metallic pipework only
Is lead or lead alloy pipework permitted for new gas installations?
Only for temporary fixes
Only underground use
No, prohibited
Yes, with approval
Why are compression joints prohibited in inaccessible locations?
They may need future tightening
They corrode quickly
They block gas flow
They are too expensive
What are the two main types of soldered joints used by gas engineers?
Brazed and threaded
Press-fit and clamp
Compression and flare
Yorkshire and end feed
When are press-fit (press-end) connections particularly useful?
When solder is required
When flame use is prohibited
When threading is necessary
When heat is preferred
What are the requirements for pipework passing through a building foundation?
No special requirements
Adequate load protection
Install flexible hose
Use lead sleeves
Is gas pipework allowed to be run in the cavity of a wall?
Generally no
Generally yes
Only behind insulation
Only with vents
What must be done when a gas pipe passes through a wall or floor?
It must be sleeved
It must be painted
It must be insulated
It must be capped
Where should a pipe sleeve normally be sealed?
At both ends
At the open end
Not sealed at all
At the buried end
Why must gas pipework be separated from electrical services like cables?
To reduce noise
To ease installation
To save space
To prevent electrical faults
What is the maximum permitted design pressure loss for a natural gas installation?
Exactly 2 mbar
Up to 5 mbar
No limit specified
Not exceed 1 mbar
How do pipe fittings affect the calculation of a pipe's length?
They are ignored in pressure calculations
They add "equivalent length" to total length
They reduce total length due to streamlining
They only matter for tee pieces at branches
When calculating pressure loss, which part of a tee piece must be considered?
End run straight through the tee
Only the largest diameter side
Branch where gas enters or leaves
Both ends equally regardless of flow
A meter shows low inlet working pressure at an appliance. What is the most likely cause?
Undersized pipework or partial blockage
Oversized pipework allows too much flow
Regulator set higher than required
Appliance jets are incorrectly sized
What is the purpose of using a temporary continuity bond when a gas pipe is cut or removed?
Improve flow and reduce turbulence
Prevent electric shocks and sparks
Detect leaks during pressure tests
Provide mechanical support during work
Where should the main protective equipotential bonding clamp be attached relative to the gas meter?
Within 600 mm of the meter outlet
Anywhere after the first branch
At the appliance isolation valve
On the incoming service before the meter
Before leaving an uncompleted gas job unattended, what must an engineer do?
Install a temporary regulator
Notify the local authority
Purge with nitrogen fully
Seal every incomplete gas way
What is sulfidation and where does it occur in gas installations?
Reaction forming black dust in copper pipe
Aluminum corrosion inside appliances
Copper oxide forming outside pipes
Steel rusting in damp meter boxes
When must gas pipework be colour-coded yellow or otherwise marked?
In domestic premises near kitchens
Only for underground external runs
Whenever flexible hoses are used
When installed in non-domestic premises
What is the rule for gas pipework in properties with electro-osmotic damp proofing systems?
All metallic pipes bonded at every branch
All metallic pipes above ground floor level
All metallic pipes below ground floor
All metallic pipes insulated at joints
A gas pipe runs through a cavity wall in a dwelling. Under what condition may this be allowed without violating safety requirements?
If the pipe is painted for visibility
If the pipe is enclosed in a gas‑tight sleeve and sealed
If the pipe is strapped at 1‑m intervals
If the pipe has a nearby manual shutoff tap
When pipework passes through foundations or load‑bearing walls, what is the primary purpose of sleeving?
To improve external corrosion resistance
To prevent movement‑induced failure of pipework
To enable faster purging after testing
To increase pipe pressure capacity
Which statement best describes Regulation 20 on structural protection?
It sets maximum distances from electrical conduits
It requires all ducts to have forced ventilation systems
It prohibits any gas installation that impairs building fire resistance
It allows minor notches in beams for small pipes
A new section of pipework is added to an existing system. What must occur before it is placed into service?
Hydraulic pressure boosting
Tightness testing and purging correctly
Painting and labeling only
Immediate connection to consumer appliances
A factory installs exposed gas pipework. How should these pipes be identified to meet marking requirements?
Green bands with flow arrows only
Blue stripes with white tags
Colour‑coded yellow (ochre) with gas identification
Red paint with hazard diamonds
Which situation triggers the duct ventilation requirement?
Pipes installed under suspended floors
Pipes crossing electrical cable trays
Outdoor pipework near drains
Any duct that encloses a gas supply
For large‑diameter service pipes subject to Regulation 24, which two features must be present near the primary meter or emergency control?
A test nipple and purge stack
A flame arrestor and filter set
A pressure gauge and drain cock
A line diagram and accessible valve
An engineer finds that a gas installation lacks adequate electrical bonding. What is the required action?
Disconnect the gas supply immediately
Inform the responsible person so a competent electrical engineer can rectify
Note it for the next annual inspection only
Install a temporary jumper bond themselves
