72 Questions
What is the primary consideration for selecting piping materials?
Anticipated operating conditions of pressure, temperature, and corrosion
Which type of pipe is most commonly used for power plant piping?
Steel
What is the primary use of cast iron in power plants?
Ash handling systems, sewage lines, and underground water lines
What type of iron is commonly used for screwed fittings?
Malleable iron
Why is steel pipe manufactured in two main categories?
To suit different operating conditions
What type of materials are brass and copper?
Non-ferrous materials
What is the meaning of the word 'nominal' in Nominal Pipe Size?
Only in name
What is the unit of measurement used in the Imperial System for Nominal Pipe Size?
Inches
For NPS 14 (DN 350) and larger pipe, what does the number represent?
Actual outside diameter of the pipe
What is the purpose of a union in piping?
To provide an easy method for dismantling piping
What is the formula to determine the inside diameter of a pipe?
d = D - 2t
What is the advantage of screwed connections in piping?
They can be easily assembled or disassembled
What is the purpose of a nipple in piping?
To make close connections
What is the purpose of a tee in piping?
To make branch line connections at 90°
What is the unit of measurement used in the metric system for Nominal Pipe Size?
Millimeters
What is the purpose of a plug in piping?
To close off open pipe ends or fittings
What is the main advantage of using welded joints for piping over screwed or flanged connections?
They eliminate the possibility of leakage
What is the primary disadvantage of using welded joints for piping?
They require a skilled welder
What is the typical method used for welding piping of DN 50 (2 in. NPS) and smaller?
Socket welding
What is the purpose of backing or back up rings in welding?
To line up the pipe and prevent weld metal from protruding inside
Why is it important to clearly identify fittings, valves, and flanges?
To ensure they are of the proper strength and material for the service
What is the minimum requirement for marking fittings, valves, and flanges?
Manufacturer's name, service designation, and material designation
What is the primary cause of additional stress in piping systems?
Thermal expansion
What is the purpose of expansion bends in piping systems?
To allow for thermal expansion
What is the difference between a slip corrugated slip expansion joint and a corrugated expansion joint?
One uses a slip pipe and the other uses a flexible corrugated section
What is the purpose of semi-plastic packing in a slip corrugated slip expansion joint?
To prevent leakage between the slip pipe and the joint body
What type of threads do plugs have?
Male (external) threads
What is the purpose of the smaller connection in a bushing being tapped eccentrically?
To facilitate free drainage of water
What is the purpose of a pipe reamer?
To remove the internal burr of the pipe
What is the advantage of flanged connections over welded connections?
They permit disassembly
What is the purpose of a gasket in a flanged connection?
To prevent leakage
What type of gasket is used for high-pressure and special services?
Ring joint gasket
Why is it important to clean and free the flange and gasket surfaces from foreign particles?
To prevent leakage
What is the correct method of tightening the bolts in a flanged connection?
Tightening in the cross-over method
What type of connections are used in piping systems constructed from stainless steel or other costly materials?
Van Stone flanges
What is the purpose of reducers in piping?
To reduce the pipe size
What is the primary consideration for selecting materials used in piping systems?
Anticipated operating conditions of pressure, temperature, and corrosion
Which type of iron is brittle and not suitable for pressurized service?
Cast iron
What is the main purpose of referring to standard piping codes such as ASME Piping Codes?
To ensure the material is safe under anticipated operating conditions
What is the primary advantage of using steel pipe in power plant piping?
It is the most common piping material
Which type of materials are used in instrumentation and water services in power plants?
Non-ferrous materials
What is the main purpose of using forged steel in piping systems?
To produce welded fittings
What is the primary purpose of a bushing in piping?
To connect two pipes of different sizes
What is the main advantage of using flanged connections over screwed connections?
They are more convenient to assemble and disassemble
What is the purpose of cutting and threading pipes in piping systems?
To connect pipes to fittings and valves
What is the primary purpose of a pipe reamer?
To remove internal burrs from pipes
What is the main consideration when assembling a flanged joint?
Ensuring the flanges are aligned properly
What is the purpose of a gasket in a flanged connection?
To fill small depressions in the flange faces
What is the primary purpose of reducers in piping systems?
To reduce the size of pipes
What is the main advantage of using welded connections over flanged connections?
They provide a stronger connection than flanged connections
What is the purpose of a displacement cutter in piping?
To cut pipes to the required length
What is the primary purpose of a Van Stone flange in piping systems?
To connect pipes to costly materials such as stainless steel
What is the primary benefit of using expansion bends in piping systems?
They require minimal maintenance and have a low likelihood of leaks
What is the primary purpose of using semi-plastic packing in a slip corrugated slip expansion joint?
To prevent leakage between the slip pipe and the joint body
What is the primary consideration when selecting materials for piping?
The pressure-temperature rating of the material
What is the primary advantage of using welded joints for piping over screwed or flanged connections?
They eliminate the possibility of leakage
What is the primary purpose of marking fittings, valves, and flanges?
To ensure the component is used for the proper service
What is the primary disadvantage of using welded joints for piping?
They require specialized skills to install
What is the purpose of backing or back up rings in welding?
To prevent weld metal from protruding inside the pipe
What is the primary cause of additional stress in piping systems?
The expansion of piping due to heat
What is the purpose of a corrugated expansion joint in piping systems?
To absorb a certain amount of endwise movement of the pipe
What is the primary benefit of using socket welding for piping of DN 50 (2 in. NPS) and smaller?
It provides a more secure connection than butt-welding
What is the significance of the Nominal Pipe Size (NPS) number?
It represents the nominal inside diameter of the pipe up to NPS 12.
What is the pattern of the Schedule Numbers used to designate wall thickness?
They increase in ascending order of wall thickness.
What is the advantage of screwed connections in piping?
They are easier to assemble and disassemble.
What is the purpose of a coupling in piping?
To connect two pieces of pipe of the same size in a straight line.
What is the relationship between the outside diameter and the wall thickness of a pipe?
The outside diameter remains constant regardless of the wall thickness.
What is the difference between the Imperial System and the metric system in designating pipe sizes?
The Imperial System uses NPS numbers, while the metric system uses DN numbers.
What is the significance of the DN numbers in the metric system?
They do not exactly match the outside diameter of the pipe.
What is the purpose of a plug in piping?
To close off open pipe ends or fittings.
What is the relationship between the inside diameter and the wall thickness of a pipe?
The inside diameter decreases as the wall thickness increases.
What is the purpose of a union in piping?
To provide an easy method for dismantling piping.
Learn about the materials used to manufacture pipes and how to select the right one for your piping system based on operating conditions. Understand the guidance provided by standard piping codes such as ASME B31.1, B31.3, and others. Test your knowledge of piping materials and their applications!
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