Oxy-fuel Gas Cylinders and Equipment Section 4 Flashcards
With RENTED cylinders, who is responsible for cylinder maintenance?
a. Employee
b. Employer
c. Supervisor
d. Supplier
d. Supplier
Where do oxygen and fuel gases typically come from?
a. Gas stations
b. Gas cylinders
c. Gas pipelines
d. Gas generators
b. Gas cylinders
What should be done if any noticeable damages or faults are observed in a rented gas cylinder?
a. Ignore them
b. Report them to the manufacturer
c. Report them to the user’s employer
d. Report them to the supplier
d. Report them to the supplier
What is the typical pressure at which oxygen is supplied in compressed gas cylinders?
a. 10,000 kPa (1,450 psi)
b. 15,000 kPa (2,175 psi)
c. 18,000 kPa (2,600 psi)
d. 20,000 kPa (2,900 psi)
c. 18,000 kPa (2,600 psi)
What is the range of capacities for oxygen cylinders in compressed form?
a. 0.1 m^3 - 1.0 m^3 (5 ft^3 - 50 ft^3)
b. 1.0 m^3 - 5.0 m^3 (50 ft^3 - 250 ft^3)
c. 0.5 m^3 - 9.35 m^3 (20 ft^3 - 335 ft^3)
d. 10 m^3 - 20 m^3 (500 ft^3 - 1000 ft^3)
c. 0.5 m^3–9.35 m^3 (20 ft^3 - 335 ft^3)
Which two types of large-size oxygen cylinders are commonly used in industry?
a. A-type and B-type
b. T-type and K-type
c. X-type and Y-type
d. M-type and N-type
b. T-type and K-type
What is the capacity of a T-type oxygen cylinder in compressed form?
a. 7 m^3 (244 ft^3)
b. 9.35 m^3 (335 ft^3)
c. 5 m^3 (177 ft^3)
d. 10 m^3 (354 ft^3)
b. 9.35 m^3 (335 ft^3)
What is the capacity of a K-type oxygen cylinder in compressed form?
a. 7 m^3 (244 ft^3)
b. 9.35 m^3 (335 ft^3)
c. 5 m^3 (177 ft^3)
d. 10 m^3 (354 ft^3)
a. 7 m^3 (244 ft^3)
At what pressure is oxygen compressed in a K-type cylinder, measured in both MPa and psi?
a. 10 MPa (1450 psi)
b. 15 MPa (2200 psi)
c. 20 MPa (2900 psi)
d. 25 MPa (3625 psi)
b. 15 MPa (2200 psi)
What is the temperature at which the T-type oxygen cylinder is compressed?
a. 10°C
b. 15°C
c. 21°C
d. 25°C
c. 21°C
Same are K-type
What is the temperature at which the K-type oxygen cylinder is compressed?
a. 10°C
b. 15°C
c. 21°C
d. 25°C
c. 21°C
Same as T-type
What material are high-pressure oxygen cylinders typically made of?
a. Aluminum
b. Copper
c. High-carbon steel
d. Plastic
c. High-carbon steel
What is the minimum thickness of the walls of high-pressure oxygen cylinders?
a. 3 mm (1/8 in)
b. 4 mm (3/16 in)
c. 5 mm (1/5 in)
d. 6 mm (1/4 in)
d. 6 mm (1/4 in)
How are threaded collars fitted for high-pressure oxygen cylinders?
a. Weld-fitted
b. Thread-fitted
c. Compression-fitted
d. Bolt-fitted
c. Compression-fitted collar
What type of collars do high-pressure oxygen cylinders have?
a. Welded collar
b. Screwed collar
c. Compressed collar
d. Threaded collar
d. Threaded collar
How does temperature affect the gas pressure within the oxygen cylinder?
a. It has no effect
b. Gas pressure increases when heated and decreases when cooled
c. Gas pressure decreases when heated and increases when cooled
d. Gas pressure remains constant regardless of temperature changes
b. Gas pressure increases when heated and decreases when cooled
What material is typically used to fabricate the high-pressure oxygen cylinder valve?
a. Steel
b. Aluminum
c. Forged brass
d. Copper
c. Forged brass
What covers the high-pressure oxygen cylinder valve when the cylinder is not in use?
a. Rubber seal
b. Protective cap
c. Metal latch
d. Plastic sleeve
b. Protective cap
What type of construction does the oxygen cylinder valve have to prevent oxygen leaking around the stem?
a. Single-seal
b. Double-seal
c. Triple-seal
d. No seal
b. Double-seal
What stops oxygen from coming out of the cylinder when the oxygen cylinder valve is closed?
a. Oxygen flow seal
b. Stem seal
c. Back seating seal
d. Valve handle
a. Oxygen flow seal
What stops oxygen from going up the valve stem when the oxygen cylinder valve is fully open?
a. Oxygen flow seal
b. Stem seal
c. Back seating seal
d. Valve handle
c. Back seating seal
In which direction should the valve wheel be turned to open the oxygen cylinder valve?
a. Clockwise
b. Counterclockwise
c. Upwards
d. Downwards
b. Counterclockwise
What could happen if the oxygen cylinder valve is suddenly opened?
a. The cylinder may explode
b. The valve may jam
c. The regulator may burst
d. The valve may leak
c. The regulator may burst
Why should the valve be opened slowly?
a. To conserve oxygen
b. To reduce noise
c. To prevent stress on the pressure regulator
d. To increase gas flow
c. To prevent stress on the pressure regulator
What safety device is equipped on high-pressure oxygen cylinder valves?
a. Hexagonal nut
b. Safety disk
c. Capped nut
d. Vent holes
b. [a burstable] safety disk
What is the purpose of the burstable safety disk inside the safety nut?
a. To release oxygen
b. To evenly distribute pressure
c. To seal the cylinder valve
d. To prevent leaks
a. To release oxygen
At what pressure does the specially designed safety disk rupture?
a. 27,000 kPa (4,000 psi)
b. 4,000 kPa (580 psi)
c. 27 MPa (3,900 psi)
d. 4 bar (58 psi)
a. 27,000 kPa (4,000 psi)
What happens if the safety disk ruptures?
a. Oxygen is released through the hexagonal nut
b. The cylinder valve is sealed shut
c. The cylinder becomes pressurized
d. The hexagonal nut expands
a. Oxygen is released through the hexagonal nut
What first action should be taken if a faulty cylinder valve or ruptured safety disk is found?
a. Replace the safety disk
b. Move the cylinder to a closed area
c. Move the cylinder to an open area and tag it
d. Notify the supplier for immediate pick up
c. Move the cylinder to an open area and tag it
What precaution should be taken regarding lubricants and oxy-fuel gas equipment?
a. Too little lubricant won’t enhance the performance of oxy-fuel gas equipment.
b. Lubricants must be applied sparingly to ensure sealing.
c. Lubricants can catch fire or explode in the presence of compressed oxygen.
d. Lubricants are necessary for proper maintenance of oxy-fuel gas equipment.
c. Lubricants can catch fire or explode in the presence of compressed oxygen.
