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NCCER Pipeline Mech practice questions

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Question 1Pipeline Mechanic

Before lowering a section of pipe into a trench, what is the primary purpose of a pipe sling or choker rigged to an excavator or sideboom?

  1. To protect the pipe coating from ultraviolet sunlight
  2. To measure the exact length of the pipe joint
  3. To align the pipe bevel for welding automatically
  4. To control and support the pipe load during lifting and placement Correct answer.

Explanation

A sling or choker transfers the pipe weight to the lifting equipment and gives the operator control of the load. Proper rigging keeps the pipe balanced and prevents it from dropping or swinging into workers.

Question 2Pipeline Mechanic

In pipeline terminology, what does the term 'bell hole' refer to?

  1. A pressure-test manifold connection point
  2. A flared end formed on pipe to accept the next joint
  3. A storage rack for pipe joints at the spread
  4. An excavated pit dug around a pipe for welding or repair work Correct answer.

Explanation

A bell hole is a widened excavation dug beneath and around the pipe so workers can access the joint for welding, coating, or repair. It must be sloped or shored to protect workers from cave-in.

Question 3Pipeline Mechanic

Which coating defect is described as a small holiday or pinhole that exposes bare steel through the coating?

  1. A wrinkle
  2. A sag
  3. An orange peel
  4. A holiday Correct answer.

Explanation

A holiday is a discontinuity or pinhole in the coating that leaves the steel exposed to corrosion. Holidays are located with a holiday detector and then patched before backfill.

Question 4Pipeline Mechanic

What is the main function of line pipe bevels prepared before welding?

  1. To provide a shaped groove that allows full penetration of the weld Correct answer.
  2. To mark the pipe grade for inspection
  3. To reduce the weight of the pipe joint for handling
  4. To create a threaded surface for coupling

Explanation

The bevel forms the groove geometry that lets the welder deposit root, fill, and cap passes with full joint penetration. Bevel angle and land must match the welding procedure specification.

Question 5Pipeline Mechanic

During lowering-in, why are pipe rollers or slings spaced along the pipe rather than supporting it at only two points?

  1. To allow the pipe to be rotated for coating
  2. To reduce the number of sideboom operators needed
  3. To speed up the welding of the joints
  4. To distribute support and limit bending stress in the pipe span Correct answer.

Explanation

Evenly spaced supports limit the unsupported span and keep bending stress within allowable limits. Excessive span can overstress the pipe or coating before it reaches the trench.

Question 6Pipeline Mechanic

What does hydrostatic testing of a pipeline section primarily verify?

  1. The alignment of the pipe in the trench
  2. The coating adhesion to the pipe
  3. The exact grade of the pipe steel
  4. The strength and leak tightness of the completed section Correct answer.

Explanation

A hydrostatic test pressurizes a filled section with water to confirm it holds pressure without leaking and meets strength requirements. Test pressure and duration follow the governing code and project specification.

Question 7Pipeline Mechanic

Why is a pipeline ditch typically backfilled with select material and padded around the pipe?

  1. To increase the internal operating pressure
  2. To speed up the welding process
  3. To improve the pipe's magnetic properties
  4. To protect the coating and pipe from damage by rocks and sharp debris Correct answer.

Explanation

Padding or select backfill cushions the pipe and prevents rocks from gouging the coating or denting the steel. Damaged coating becomes a corrosion site after the ditch is closed.

Question 8Pipeline Mechanic

What is the purpose of a pipe end facing machine in a pipeline spread?

  1. To measure the wall thickness of the pipe
  2. To bend the pipe to match the ditch profile
  3. To machine the pipe end square and cut the specified bevel Correct answer.
  4. To apply the external coating to the joint

Explanation

A facing machine squares the pipe end and cuts the bevel to the dimensions required by the welding procedure. Accurate end preparation supports consistent root gap and penetration.

Question 9Pipeline Mechanic

A 24-inch pipe joint must be lifted by a two-leg bridle sling. If each leg shares the load equally and the joint weighs 4,800 lb, what is the approximate tension in each leg when the legs are vertical?

  1. 2,400 lb Correct answer.
  2. 9,600 lb
  3. 1,200 lb
  4. 4,800 lb

Explanation

With two vertical legs sharing the load equally, each leg carries half the total weight. Half of 4,800 lb is 2,400 lb per leg.

Question 10Pipeline Mechanic

A welder is making a root pass on line pipe and observes a narrow, deep void at the root that follows the joint. Which term best describes this discontinuity?

  1. Slag inclusion
  2. Porosity
  3. Lack of penetration Correct answer.
  4. Undercut

Explanation

Lack of penetration is incomplete fusion or incomplete filling at the root, often caused by insufficient heat, current, or travel speed. It appears as a void or unfused area along the root of the joint.

Question 11Pipeline Mechanic

When a pipeline crosses a road, what is the typical purpose of a casing pipe installed around the carrier pipe?

  1. To serve as a permanent vent for the line
  2. To increase the flow capacity of the pipeline
  3. To carry the product and bypass the road
  4. To provide structural protection and allow carrier pipe installation without open cutting the road Correct answer.

Explanation

A casing protects the carrier pipe and the road structure and allows installation by boring or jacking without trenching through the roadway. Insulators and seals are used to keep the casing and carrier separated and protected.

Question 12Pipeline Mechanic

A crew is using a holiday detector on a fusion-bonded epoxy coating. What does a spark at a specific location indicate?

  1. A correct cure of the coating
  2. A defect in the pipe weld
  3. An excess of coating thickness
  4. A coating discontinuity that exposes the steel Correct answer.

Explanation

The holiday detector applies a voltage across the coating, and a spark jumps where the coating is thin, missing, or damaged enough to expose the steel. That location must be marked and repaired.

Question 13Pipeline Mechanic

A pipe is being bent to match a ditch profile. Which practice helps prevent wrinkling or ovality on the inside of the bend?

  1. Using a bending machine with a matching shoe and applying controlled, incremental bends Correct answer.
  2. Heating the pipe to a bright red color before bending
  3. Using a hydraulic jack against the pipe wall without a shoe
  4. Bending the pipe cold in one continuous stroke

Explanation

A properly matched bending shoe supports the pipe wall and distributes force, and incremental bends allow the operator to check for ovality and wrinkles. Controlled bending keeps deformation within allowable limits.

Question 14Pipeline Mechanic

During a hydrostatic test, a section is filled and pressurized. Why is air removed from the test section before pressurization?

  1. Air compresses and stores energy, which can cause a violent release if the section fails Correct answer.
  2. Air causes the pipe coating to dissolve
  3. Air increases the weight of the water and overloads the pipe
  4. Air prevents the test gauge from reading pressure

Explanation

Trapped air is compressible and stores energy, so a failure could release that energy suddenly and dangerously. Removing air also gives a more accurate, stable pressure reading.

Question 15Pipeline Mechanic

What is the purpose of a line-up clamp when joining two pipe joints for welding?

  1. To measure the pipe ovality after bending
  2. To apply the root pass automatically
  3. To cut the bevel on both pipe ends
  4. To hold the joint aligned and set the proper root gap Correct answer.

Explanation

A line-up clamp aligns the pipe ends and holds the root gap and mismatch within the limits required by the welding procedure. Proper alignment supports a sound root pass.

Question 16Pipeline Mechanic

A coating crew is applying a two-part epoxy to a field joint. What does the term 'pot life' mean in this context?

  1. The temperature at which the coating cures
  2. The maximum thickness the coating can reach
  3. The time available to apply the mixed material before it becomes unusable Correct answer.
  4. The shelf life of the unmixed components

Explanation

Pot life is the working time after the components are mixed during which the material can still be applied properly. Exceeding pot life causes poor adhesion or incomplete cure.

Question 17Pipeline Mechanic

A crew must install a pipeline across a small stream. Which method avoids open trenching through the water and is commonly used for this crossing?

  1. Open-cut trenching through the streambed
  2. Laying the pipe on the water surface
  3. Blasting the streambed
  4. Horizontal directional drilling Correct answer.

Explanation

Horizontal directional drilling installs the pipe beneath the streambed without disturbing the waterway, which is often required by permits. It reduces erosion and impacts on aquatic habitat.

Question 18Pipeline Mechanic

A pipe joint is being lowered into a trench and the sideboom operator must maintain control. Which factor most directly increases the load on the lifting equipment?

  1. Painting the pipe with a lighter color
  2. Adding a second operator on the radio
  3. Using a longer pipe joint of the same weight
  4. Increasing the horizontal reach or boom radius Correct answer.

Explanation

Lifting capacity decreases as the boom radius increases because the load moment on the machine grows. Operators must check the load chart for the actual radius before lifting.

Question 19Pipeline Mechanic

What is the purpose of a pig in pipeline construction and operation?

  1. To measure the pipe length in the ditch
  2. To lift the pipe during lowering-in
  3. To clean, inspect, or separate products inside the pipe Correct answer.
  4. To seal the pipe ends during welding

Explanation

A pig travels through the pipeline to clean the bore, inspect the wall, or separate batches of product. Different pig types serve different purposes depending on the operation.

Question 20Pipeline Mechanic

A crew is preparing to tie in a new section to an existing live pipeline. Which step is most important before hot work begins?

  1. Removing all fire extinguishers to clear the work area
  2. Confirming isolation, depressurization, and gas testing of the affected section Correct answer.
  3. Welding quickly before the line cools
  4. Increasing the flow rate to purge the line

Explanation

Tie-in to a live line requires positive isolation, depressurization, and atmospheric testing to confirm the area is safe for hot work. A permit and gas monitoring are part of the control process.

Question 21Pipeline Mechanic

A 12-inch pipe has an outside diameter of 12.75 inches and a wall thickness of 0.375 inch. What is the inside diameter?

  1. 12.75 inches
  2. 12.375 inches
  3. 13.50 inches
  4. 12.00 inches Correct answer.

Explanation

Inside diameter equals outside diameter minus twice the wall thickness: 12.75 minus 2 times 0.375, which equals 12.00 inches. Wall thickness is subtracted twice because it occurs on both sides of the pipe.

Question 22Pipeline Mechanic

A pipeline section must be tested at 1.25 times its maximum allowable operating pressure of 1,200 psi. What is the required minimum test pressure?

  1. 1,200 psi
  2. 1,500 psi Correct answer.
  3. 1,800 psi
  4. 1,350 psi

Explanation

Multiply the maximum allowable operating pressure by the test factor: 1,200 times 1.25 equals 1,500 psi. The actual test pressure must also comply with the governing code and project specification.

Question 23Pipeline Mechanic

A weld shows a crack running along the centerline of the cap pass. Which action is the correct response?

  1. Paint over the crack to seal it from moisture
  2. Increase the operating pressure to close the crack
  3. Leave the crack and note it in the inspection report
  4. Remove the crack by grinding or cutting out and reweld per the repair procedure Correct answer.

Explanation

Cracks are rejectable discontinuities and must be removed completely before repair welding, following the approved repair procedure. Painting or leaving a crack would allow it to propagate and cause failure.

Question 24Pipeline Mechanic

During a lowering-in operation, the pipe begins to slide laterally in the slings. Which immediate action best addresses the hazard?

  1. Have a worker guide the pipe by hand from below
  2. Stop the lift and reposition or adjust the rigging before continuing Correct answer.
  3. Continue lowering quickly to reach the ditch bottom
  4. Signal the operator to raise the boom at full speed

Explanation

A shifting load indicates the rigging is unbalanced or improperly attached, so the lift must stop and the rigging corrected. Continuing or rushing the lift risks dropping the pipe or striking workers.

Question 25Pipeline Mechanic

A cathodic protection system is installed on a coated steel pipeline. What is the primary purpose of the coating in combination with the cathodic protection?

  1. The coating provides the primary barrier, and cathodic protection protects areas where the coating is damaged Correct answer.
  2. The coating replaces the need for any electrical isolation
  3. The coating increases the pipe's operating pressure rating
  4. The coating carries the protective current along the pipe

Explanation

Coating is the primary barrier against corrosion, while cathodic protection supplements it at holidays and damaged areas. The two systems work together to control external corrosion.

Question 26Pipeline Mechanic

A pipeline mechanic is checking the wall thickness of a section of line pipe with an ultrasonic thickness gauge. The nominal wall thickness is 0.500 inch, and the gauge reads 0.475 inch. What is the percent wall loss?

  1. 2.5%
  2. 10.5%
  3. 5.0% Correct answer.
  4. 25.0%

Explanation

Percent wall loss is calculated as (nominal thickness minus measured thickness) divided by nominal thickness, multiplied by 100. Here, (0.500 - 0.475) / 0.500 × 100 = 5.0%. This value helps determine whether the pipe meets allowable corrosion criteria.

Question 27Pipeline Mechanic

When a pipeline is being installed through a horizontal directional drill, which component is typically attached to the leading end of the pipe string to protect the pipe and provide a connection for the reaming assembly?

  1. A pig
  2. A line-up clamp
  3. A casing spacer
  4. A pull head Correct answer.

Explanation

A pull head is welded or attached to the leading end of the pipe string during a horizontal directional drill. It provides a strong connection point for the drill rig and protects the pipe end from damage during pullback. Pigs, casing spacers, and line-up clamps serve different purposes.

Question 28Pipeline Mechanic

A pipeline mechanic is preparing to tap a live natural gas line to install a new service connection. Which device is used to drill into the pipe without releasing gas to the atmosphere?

  1. A line stopper
  2. A pig launcher
  3. A hot tap machine Correct answer.
  4. A pressure relief valve

Explanation

A hot tap machine is used to drill into a pressurized pipeline while it remains in service, containing the product and preventing release. Line stoppers block flow, pig launchers introduce pigs, and relief valves protect against overpressure. The hot tap machine is the correct tool for making the connection.

Question 29Pipeline Mechanic

A crew is installing a pipeline across a highway using a casing pipe. What is the primary purpose of the casing in this application?

  1. To protect the carrier pipe from external loads and allow easier replacement Correct answer.
  2. To allow the carrier pipe to be heated electrically
  3. To provide a path for cathodic protection current
  4. To increase the flow capacity of the carrier pipe

Explanation

A casing pipe installed under a highway shields the carrier pipe from live loads and mechanical damage, and it allows the carrier pipe to be replaced without excavating the roadway. It does not increase flow capacity, provide cathodic protection current, or heat the pipe.

Question 30Pipeline Mechanic

In pipeline construction, what is the primary purpose of a bending shoe on a bending machine?

  1. To cut the pipe to length
  2. To measure the angle of the bend
  3. To heat the pipe before bending
  4. To apply controlled force that bends the pipe to a desired radius Correct answer.

Explanation

A bending shoe is the curved die that contacts the pipe and applies force to bend it to a specific radius. It does not cut, measure, or heat the pipe. Proper selection of the shoe helps prevent wrinkling and ovality.

Question 31Pipeline Mechanic

A pipeline mechanic is inspecting a girth weld and observes a small, rounded void on the weld surface that appears to have broken open. Which term best describes this discontinuity?

  1. Porosity Correct answer.
  2. Underfill
  3. Slag inclusion
  4. Incomplete fusion

Explanation

Porosity is a cavity-type discontinuity formed by gas trapped in the weld metal. It often appears as rounded voids on the surface or within the weld. Slag inclusion, incomplete fusion, and underfill have different appearances and causes.

Question 32Pipeline Mechanic

Which type of pipeline pig is designed primarily to remove liquid and soft deposits from the inside of a pipeline?

  1. A batching pig
  2. A gauging pig
  3. A cleaning pig Correct answer.
  4. A smart pig

Explanation

Cleaning pigs, such as brush or scraper pigs, are used to remove liquid, wax, and soft deposits from the pipe wall. Gauging pigs check for dents, smart pigs perform inspection, and batching pigs separate products.

Question 33Pipeline Mechanic

A pipeline mechanic is using a hand-held grinder to smooth a weld cap. Which personal protective equipment is most important to protect the eyes from flying particles?

  1. A face shield worn over safety glasses Correct answer.
  2. Safety glasses with side shields
  3. Goggles with indirect ventilation
  4. A welding hood with a dark lens

Explanation

Grinding produces high-velocity particles that can strike the face and eyes. A face shield worn over safety glasses provides the best protection because the shield blocks direct impact while the glasses protect against particles that may pass around the shield. Safety glasses alone, goggles, or a welding hood are not sufficient for grinding.

Question 34Pipeline Mechanic

A pipeline crew is preparing to lower a section of pipe into a trench. The pipe is coated with fusion-bonded epoxy. Which practice best protects the coating during lowering-in?

  1. Rolling the pipe along the trench wall
  2. Using padded slings and avoiding dragging the pipe Correct answer.
  3. Dropping the pipe quickly to reduce exposure time
  4. Using bare steel slings directly on the pipe

Explanation

Padded slings and careful handling prevent mechanical damage to the coating. Bare slings, dropping, or dragging can cause abrasion, gouges, or holidays that compromise corrosion protection. Coating integrity is critical for the pipeline's long-term performance.

Question 35Pipeline Mechanic

During a hydrostatic test, a pipeline section is filled with water and pressurized to 1,500 psi. The test pressure is held for eight hours. Which factor is most important to monitor continuously during the hold period?

  1. Pump speed
  2. Air compressor output
  3. Pressure and visible leaks Correct answer.
  4. Water temperature at the fill point

Explanation

The test is valid only if the test pressure is maintained and no leaks occur. Monitoring pressure and inspecting for visible leaks are the critical activities during the hold period. Water temperature, pump speed, and air compressor output are not the primary indicators of test integrity.

Question 36Pipeline Mechanic

A pipeline is being installed in a rocky area. The specification requires padding and select backfill around the pipe. Which action best ensures the pipe coating is not damaged by the backfill?

  1. Backfilling with the original rocky spoil
  2. Placing large rocks directly against the pipe
  3. Using screened or crushed material free of large rocks around the pipe Correct answer.
  4. Compacting the backfill with a heavy tamper directly over the pipe

Explanation

Select backfill free of large rocks or sharp objects cushions the pipe and protects the coating from punctures and abrasion. Original rocky spoil, large rocks, or heavy compaction directly over the pipe can damage the coating and the pipe.

Question 37Pipeline Mechanic

A welder is using a cellulosic electrode for the root pass on a pipeline. The root pass shows a condition known as 'high-low' at the internal line-up. What does high-low refer to?

  1. A type of slag inclusion
  2. A variation in welding current
  3. A mismatch in internal pipe diameter at the joint Correct answer.
  4. An excessively high weld cap

Explanation

High-low refers to a mismatch in the internal diameters of two joined pipe ends, creating a step on the inside surface. This can cause turbulence and inspection issues. It is not related to current, slag, or cap height.

Question 38Pipeline Mechanic

A pipeline mechanic is performing routine maintenance on a sideboom. Which check is most critical for safe lifting operations?

  1. Testing the radio communication system
  2. Inspecting the wire rope for broken wires and corrosion Correct answer.
  3. Checking the engine oil level
  4. Verifying the paint condition

Explanation

Wire rope is a primary load-bearing component of the sideboom. Broken wires, corrosion, or other damage can reduce its strength and lead to failure. Engine oil, radio, and paint are not directly related to lifting safety.

Question 39Pipeline Mechanic

A pipeline is being tested with water. The test section is 1 mile long and has a nominal pipe size of 12 inches. Why is it important to fill the section slowly and allow air to vent at high points?

  1. To avoid freezing the water
  2. To reduce the water volume needed
  3. To prevent water hammer and ensure complete filling Correct answer.
  4. To speed up the test

Explanation

Filling slowly and venting air prevents trapped air pockets that can cause erratic pressure readings and water hammer during pressurization. Complete filling with water ensures the test is valid. It does not reduce volume, speed the test, or relate to freezing.

Question 40Pipeline Mechanic

A pipeline mechanic is inspecting a field-applied coating on a girth weld. The coating appears to have a pinhole. Which test is commonly used to detect such holidays in the coating?

  1. A torque wrench
  2. A ultrasonic thickness gauge
  3. A hardness tester
  4. A holiday detector Correct answer.

Explanation

A holiday detector applies a voltage across the coating; a spark indicates a pinhole or thin spot. Hardness testers, thickness gauges, and torque wrenches measure other properties and do not detect coating holidays.

Question 41Pipeline Mechanic

A crew is installing a pipeline across a wetland. Which construction method is most appropriate to minimize environmental impact?

  1. Dredging the wetland
  2. Using explosives to clear a path
  3. Open trenching with immediate backfill
  4. Horizontal directional drilling Correct answer.

Explanation

Horizontal directional drilling allows the pipeline to be installed beneath the wetland without disturbing the surface. Open trenching, dredging, or explosives would cause significant environmental damage. HDD is a common method for crossing sensitive areas.

Question 42Pipeline Mechanic

A pipeline mechanic is checking the alignment of two pipe joints before welding. The line-up clamp is in place. What is the primary purpose of the clamp?

  1. To hold the pipes together and maintain alignment during welding Correct answer.
  2. To apply the root pass
  3. To preheat the pipe ends
  4. To measure the weld gap

Explanation

A line-up clamp holds the pipe ends in proper alignment and maintains the root gap during welding. It does not preheat, measure, or weld. Proper alignment is essential for a sound weld.

Question 43Pipeline Mechanic

A pipeline is being pressure-tested with water. The test pressure is 1,200 psi. The pipe has a specified minimum yield strength of 52,000 psi and a wall thickness of 0.375 inch. For a 12.75-inch outside diameter pipe, what is the hoop stress at test pressure? (Use Barlow's formula: S = P × D / (2 × t))

  1. 20,400 psi Correct answer.
  2. 5,100 psi
  3. 10,200 psi
  4. 40,800 psi

Explanation

Barlow's formula gives hoop stress S = P × D / (2 × t). Substituting: S = 1,200 × 12.75 / (2 × 0.375) = 15,300 / 0.75 = 20,400 psi. This is below the SMYS of 52,000 psi, so the test is within acceptable limits.

Question 44Pipeline Mechanic

A pipeline mechanic is preparing to weld a repair on a live gas line. Which action is required before any hot work begins?

  1. Purge the line with air
  2. Notify the pipeline controller only after welding
  3. Increase the gas flow
  4. Obtain a hot work permit and verify gas readings are safe Correct answer.

Explanation

Hot work on or near a live gas line requires a permit and atmospheric testing to ensure flammable gas levels are safe. Purging with air could create a flammable mixture, increasing flow is dangerous, and notification must occur before work.

Question 45Pipeline Mechanic

A pipeline is being installed using the push method. Which factor most limits the length of pipe that can be pushed?

  1. The friction between the pipe and the soil Correct answer.
  2. The ambient temperature
  3. The color of the pipe coating
  4. The pipe wall thickness

Explanation

In push installation, the pipe is pushed into the ground or casing. Friction between the pipe and the surrounding soil or casing resists the pushing force and limits the achievable length. Wall thickness, coating color, and ambient temperature are not the primary limiting factors.

Question 46Pipeline Mechanic

A pipeline mechanic is inspecting a completed girth weld. The weld cap is too high and has excessive reinforcement. Which problem can this cause?

  1. It increases the wall thickness
  2. It improves flow efficiency
  3. It can create a stress concentration and interfere with pig passage Correct answer.
  4. It reduces the need for coating

Explanation

Excessive weld reinforcement creates a stress concentration that can lead to fatigue or cracking, and it may interfere with pigs or inspection tools. It does not improve flow, reduce coating needs, or increase wall thickness.

Question 47Pipeline Mechanic

A pipeline is being lowered into a trench. The pipe is suspended by slings from sidebooms. Which condition indicates that the pipe may be overloaded or improperly supported?

  1. The pipe sags between slings Correct answer.
  2. The slings are vertical
  3. The pipe is straight
  4. The sidebooms are evenly spaced

Explanation

Sagging between slings indicates excessive span or insufficient support, which can cause overstress or buckling. Vertical slings, a straight pipe, and even spacing are desirable conditions.

Question 48Pipeline Mechanic

A pipeline mechanic is using a hydraulic torque wrench to tighten flange bolts on a pig launcher closure. The specification requires a torque of 300 ft-lb. The wrench has a 2-foot handle. What force must be applied perpendicular to the handle to achieve the required torque?

  1. 300 lb
  2. 600 lb
  3. 75 lb
  4. 150 lb Correct answer.

Explanation

Torque equals force times distance (T = F × d). Rearranging gives F = T / d = 300 ft-lb / 2 ft = 150 lb. This is the force needed at the handle perpendicular to the lever arm.

Question 49Pipeline Mechanic

A pipeline is being hydrostatically tested. The test pressure is 1.25 times the maximum allowable operating pressure (MAOP). If the MAOP is 1,440 psi, what is the test pressure?

  1. 1,440 psi
  2. 2,880 psi
  3. 1,800 psi Correct answer.
  4. 1,152 psi

Explanation

Test pressure = 1.25 × MAOP = 1.25 × 1,440 = 1,800 psi. This is a common requirement to verify pipeline integrity.

Question 50Pipeline Mechanic

A pipeline mechanic is inspecting the coating on a pipe that has been stored outdoors for several months. The coating shows chalking and color fading. What does this indicate?

  1. The coating has undergone ultraviolet degradation Correct answer.
  2. The coating is fully cured and ready for installation
  3. The coating has excessive thickness
  4. The coating is contaminated with oil

Explanation

Chalking and fading are signs of ultraviolet degradation from prolonged sun exposure. This can reduce coating performance and may require repair or replacement before installation. Oil contamination, excessive thickness, or full cure do not cause these symptoms.