Gaskets and Piping Past Paper 2013 PDF

Critical Thinking Questions Why is the outside diameter of a pipe kept constant for different weights? a) To ensure that the inside diameter is the same for different weights. b) To allow for the use of standard dies and fittings on pipes of different wall thicknesses. * c) To prevent the use...

Critical Thinking Questions Why is the outside diameter of a pipe kept constant for different weights? a) To ensure that the inside diameter is the same for different weights. b) To allow for the use of standard dies and fittings on pipes of different wall thicknesses. * c) To prevent the use of standard dies and fittings on pipes of different wall thicknesses. d) To ensure that the outside diameter is different for different weights.   Which of the following is NOT a disadvantage of tapered thread joints? a) They are prone to loosening and leaking during system operation with vibration or pressure pulses. b) The wedging action of the taper can distort components attached to the joint. c) They are more prone to leaking than other joint types. d) They are more expensive than other joint types. *   Which gas is NOT used in purging? a) Nitrogen b) Carbon Dioxide c) Oxygen * d) Air   Which of the following is NOT a common type of gasket material? a) Rubber b) Wood * c) Teflon (PTFE) d) Metal   Which of the following is NOT a common type of pipe fitting? a) Coupling b) Tee c) Valve * d) Elbow   Procedure-Based Questions What is the correct procedure for cutting and threading a pipe? a) Mark the pipe, clamp the pipe, apply cutting fluid, cut the pipe, remove the burr, select the die, set the die, apply cutting fluid, cut the thread, clean up. * b) Clean up, mark the pipe, clamp the pipe, apply cutting fluid, cut the pipe, remove the burr, select the die, set the die, apply cutting fluid, cut the thread. c) Cut the thread, mark the pipe, clamp the pipe, apply cutting fluid, cut the pipe, remove the burr, select the die, set the die, apply cutting fluid, clean up. d) Select the die, set the die, apply cutting fluid, cut the thread, mark the pipe, clamp the pipe, apply cutting fluid, cut the pipe, remove the burr, clean up.   What is the correct procedure for making a circular gasket? a) Determine the OD and ID, lay out the center lines, ID, OD, and bolt hole circumference, obtain the proper bolt-hole spacing, cut the gasket, punch out the holes, place the gasket on the flange. * b) Place the gasket on the flange, determine the OD and ID, lay out the center lines, ID, OD, and bolt hole circumference, obtain the proper bolt-hole spacing, cut the gasket, punch out the holes. c) Punch out the holes, place the gasket on the flange, determine the OD and ID, lay out the center lines, ID, OD, and bolt hole circumference, obtain the proper bolt-hole spacing, cut the gasket. d) Cut the gasket, punch out the holes, place the gasket on the flange, determine the OD and ID, lay out the center lines, ID, OD, and bolt hole circumference, obtain the proper bolt-hole spacing.   What is the correct bolting sequence for a square four-bolt flange? a) 1, 3, 2, 4 b) 1, 4, 2, 3 c) 1, 2, 3, 4 d) 1, 3, 4, 2 *   General Knowledge Questions Which material is NOT commonly used to make pipes? a) Copper b) Cast Iron c) Aluminum * d) Plastic   Which type of gasket is used for high-pressure and high-temperature applications and can tolerate minor changes in system pressure, vibration, thermal shock, and slight flange separation while maintaining sealing integrity? a) Full face gasket b) Flat ring gasket c) Spiral-wound gasket * d) Metal-jacketed gasket   Which type of gasket joint is considered good for high-pressure applications because it provides no freedom of movement for the gasket? a) Tongue and groove * b) Male and female c) Ring joint d) Flat face   Which type of pipe has a coating of lacquer to prevent corrosion in transit and is recognized by its black shiny appearance? a) Bare metal pipe b) Galvanized pipe c) Black iron pipe * d) Pickled pipe   Which type of pipe is required for ammonia service and refrigerant lines? a) Black iron pipe b) Bare metal pipe c) Pickled pipe * d) Galvanized pipe   Which type of pipe is the standard finish for hydraulic piping? a) Pickled and oiled * b) Coated c) Black iron d) Bare metal   Which type of flange face design is primarily used for low-to-moderate system pressures? a) Flat-faced unconfined gasket joints * b) Raised face unconfined gasket joints c) Tongue and groove confined gasket joints d) Male and female semi-confined gasket joints   Which type of flange face design is commonly used on piping connections where pressures range up to approximately 900 psi? a) Flat-faced unconfined gasket joints b) Raised face unconfined gasket joints * c) Tongue and groove confined gasket joints d) Male and female semi-confined gasket joints   Which type of flange face design is considered good for high-pressure applications and provides the gasket with no freedom to move? a) Flat-faced unconfined gasket joints b) Raised face unconfined gasket joints c) Tongue and groove confined gasket joints * d) Male and female semi-confined gasket joints   Which type of flange face design is called semi-confined because the gasket is confined on its two flat sides and the outside edge? a) Flat-faced unconfined gasket joints b) Raised face unconfined gasket joints c) Tongue and groove confined gasket joints d) Male and female semi-confined gasket joints *   Which type of gasket has a metallic jacket that covers a non-metal internal filler, commonly asbestos? a) Full face gasket b) Flat ring gasket c) Spiral-wound gasket d) Metal-jacketed gasket *   Which type of gasket is used on flat-faced and raised-face flanges and is commonly used in piping systems? a) Full face gasket b) Flat ring gasket * c) Spiral-wound gasket d) Metal-jacketed gasket What is the primary function of a gasket in a piping system? a) To seal connections and prevent leakage * b) To provide structural support to pipes c) To regulate the flow of fluids d) To filter impurities in the pipeline Which material is most commonly used for high-temperature gaskets? a) Rubber b) Graphite * c) Plastic d) Fiberglass What is a primary disadvantage of metal gaskets? a) Limited temperature resistance b) Difficulty in achieving a seal with uneven surfaces * c) High elasticity d) Vulnerability to corrosion Which tool is typically used to tighten bolts on flange joints? a) Screwdriver b) Torque wrench * c) Pipe cutter d) Impact driver What should be inspected before installing a gasket? a) The material grade of the gasket b) Surface cleanliness of the flange faces * c) The bolt hole alignment d) The thickness of the flange Procedure-Based Questions What is the correct sequence for replacing a flange gasket? a) Remove bolts, clean flange faces, position gasket, tighten bolts uniformly * b) Loosen bolts, replace gasket, clean flange faces, tighten bolts c) Position gasket, tighten bolts, remove debris, inspect seal d) Tighten bolts, inspect gasket, position gasket, clean flange What are the steps to verify a flange connection after assembly? a) Tighten bolts, visually inspect, test under pressure * b) Test under pressure, tighten bolts, visually inspect c) Install gasket, tighten bolts, pressure test d) Visually inspect, remove bolts, pressure test What is the standard procedure for lockout/tagout in pipeline maintenance? a) Shut down equipment, isolate energy, apply lockout, verify de-energization * b) Shut down equipment, isolate energy, verify lockout, apply tagout c) Isolate energy, shut down equipment, verify safety, apply tagout d) Shut down equipment, apply tagout, verify energy isolation Critical Thinking Questions Why might a spiral-wound gasket be chosen over a flat gasket? a) Easier to install b) Better performance under fluctuating temperatures and pressures * c) Lower cost d) Compatibility with all flange types If a flange gasket is leaking after installation, what is the most probable cause? a) Incorrect gasket material used b) Insufficient torque applied to bolts * c) Excessive tightening of bolts d) Improper cleaning of the gasket surface When using a torque wrench, what is the significance of applying bolts in a crisscross pattern? a) Ensures bolts are tightened evenly * b) Reduces time required for installation c) Aligns the flange gasket properly d) Prevents over-tightening of bolts What is the consequence of over-tightening bolts on a flange? a) Increased seal integrity b) Deformation of the gasket * c) Enhanced durability of the flange d) Reduced maintenance frequency If a gasket is consistently failing in a high-pressure application, what is the best corrective action? a) Use a thicker gasket b) Switch to a metal or composite gasket material * c) Reduce the pressure in the system d) Increase the torque on flange bolts Application-Based Questions What is the purpose of a flange face serration pattern? a) To improve structural strength b) To enhance gasket grip and sealing capability * c) To reduce gasket wear d) To align the gasket Why is it important to re-torque bolts after system pressurization? a) To check for loosened bolts * b) To reduce system noise c) To adjust gasket compression d) To ensure uniform fluid flow Which gasket type is most suitable for handling corrosive chemicals? a) Rubber gasket b) PTFE gasket * c) Metal gasket d) Asbestos gasket Advanced Questions How does thermal expansion affect flange joint integrity? a) It increases the gasket thickness. b) It may cause joint misalignment or loosening of bolts. * c) It reduces the flange material’s elasticity. d) It strengthens the seal due to material contraction. What is the function of bolt preload in a gasketed flange connection? a) To evenly distribute the flange material b) To compress the gasket and create a seal * c) To align the flange faces d) To increase the gasket’s elasticity Why is surface finish critical for effective gasket sealing? a) To enhance bolt torque b) To ensure adequate friction and prevent leakage * c) To reduce material wear over time d) To facilitate easier disassembly What would you recommend if a flange joint leaks under dynamic loads? a) Use a thicker gasket b) Increase bolt torque incrementally * c) Reduce operational load d) Replace the flange