OFTEC Oil Pipework and Supply Systems 1 — Questions and Answers
Question 1: What is the most commonly used material for domestic oil supply pipework above ground in the UK?
- Steel
- Lead
- Copper (Correct answer)
- PVC
Correct answer: Copper
Copper tube is the most widely used material for above-ground oil supply pipework in domestic installations due to its durability, workability, and compatibility with oil fuels.
Question 2: Under BS 5410 Part 1, what size of copper tube is most commonly specified for a domestic oil supply line?
- 6mm OD
- 8mm OD
- 10mm OD (Correct answer)
- 15mm OD
Correct answer: 10mm OD
10mm OD copper tube is the standard size specified for domestic oil supply pipework in the UK under BS 5410 Part 1, providing adequate flow for typical domestic burners.
Question 3: Which British Standard governs the installation of domestic oil-fired heating equipment in the UK?
- BS 7671
- BS 5440
- BS 5410 Part 1 (Correct answer)
- BS 6700
Correct answer: BS 5410 Part 1
BS 5410 Part 1 is the British Standard specifically covering the installation of oil-fired heating equipment in domestic premises.
Question 4: What type of valve must be fitted in the oil supply line close to an oil-fired appliance for fire safety?
- Ball valve
- Gate valve
- Check valve
- Remote-sensing fire valve (Correct answer)
Correct answer: Remote-sensing fire valve
A remote-sensing (heat-actuated) fire valve must be fitted in the oil supply line to automatically shut off the fuel supply in the event of a fire near the appliance.
Question 5: What is the purpose of the heat-sensing phial in a fire valve installation?
- To measure flue gas temperature
- To detect abnormal heat and trigger the valve to shut off the oil supply (Correct answer)
- To control oil pressure to the burner
- To operate the burner ignition sequence
Correct answer: To detect abnormal heat and trigger the valve to shut off the oil supply
The heat-sensing phial is positioned near the appliance and responds to abnormal temperatures, triggering the fire valve to close and cut off the oil supply before a fire can spread.
Question 6: What is the primary difference between a single-pipe and a two-pipe oil supply system?
- Single-pipe systems are only used with vaporizing burners
- A two-pipe system includes a return line carrying excess oil and air back to the storage tank (Correct answer)
- Two-pipe systems operate at lower oil pressure than single-pipe systems
- Single-pipe systems always require a separate de-aerator vessel
Correct answer: A two-pipe system includes a return line carrying excess oil and air back to the storage tank
In a two-pipe system, excess oil and entrained air are returned to the storage tank via a return line, whereas a single-pipe system has no return and relies on the pump to draw oil without a return path.
Question 7: In which situation is a two-pipe oil supply system typically preferred over a single-pipe system?
- When the oil tank is located at the same level as the burner
- When the burner pump must lift oil from a tank positioned below the appliance level (Correct answer)
- When the installation uses a larger capacity fuel filter
- When the building has more than one oil-fired appliance
Correct answer: When the burner pump must lift oil from a tank positioned below the appliance level
A two-pipe system is recommended when the burner pump must lift oil from a below-level tank, as the return line allows entrained air to escape and ensures a reliable, air-free fuel supply.
OFTEC Oil Pipework and Supply Systems 1
What is the most commonly used material for domestic oil supply pipework above ground in the UK?