Alabama Pipelines Contractor Examination

What is the primary purpose of pipe bedding in buried pipeline construction?

• ATo provide continuous, uniform support under the pipe and protect the coating
• BTo increase the pipe wall thickness for pressure capacity
• CTo eliminate the need for hydrostatic testing
• DTo replace the cathodic-protection system

In open-cut pipeline installation, what is typically placed first after trench excavation and grade check?

• AFinal surface pavement
• BApproved bedding material shaped to the design elevation
• CConcrete roadway base course
• DTopsoil and seed

What does HDD stand for in pipeline installation?

• AHigh-Density Drainage
• BHorizontal Directional Drilling
• CHydraulic Drop Design
• DHardpan Direct Dumping

Why is pipe stringing done carefully along the right-of-way before welding and lowering-in?

• ATo keep joints in sequence, protect coatings, and minimize unnecessary handling damage
• BTo permanently set final grade without surveying
• CTo replace the need for weld procedure qualification
• DTo allow hydrostatic test water to drain overnight

What is the main purpose of a ditch break or trench break (trench dam) in a pipeline trench on a slope?

• ATo stop water from running along the trench and eroding bedding or creating voids under t…
• BTo increase the MAOP of the pipeline
• CTo eliminate the need for coating repairs
• DTo serve as a permanent cathodic-protection anode

During lowering-in, what is a key reason to use padded cradles or belting under coated pipe?

• ATo prevent coating damage and point loading on the pipe wall
• BTo heat the pipe for better weld fusion
• CTo increase wall thickness at field bends
• DTo eliminate the need for holiday testing

A pipeline trench is 400 feet long, 3 feet wide, and averages 5 feet deep. Ignoring side slopes, what is the approximate excavation volume in cubic yards?

• A111 cubic yards
• B222 cubic yards
• C333 cubic yards
• D600 cubic yards

What is the principal advantage of using a boring or jacking method under a paved roadway instead of open cut?

• AIt avoids excavating the traveled way and reduces traffic disruption and pavement restora…
• BIt always eliminates the need for utility locates
• CIt removes the requirement for coating on the product pipe
• DIt allows untrained crews to install high-pressure gas lines without procedures

When placing select backfill around a coated steel pipeline, which practice best protects the coating?

• AUsing rock-free, compactible material in the pipe zone and placing it carefully around th…
• BDumping large blasted rock directly on top of the pipe from the bank
• CLeaving voids under the pipe so water can drain freely along the invert
• DCovering the pipe with scrap metal before backfilling

What does the term “right-of-way” (ROW) refer to in pipeline construction?

• AThe strip of land acquired or authorized for constructing, operating, and maintaining the…
• BOnly the interior diameter of the pipe
• CThe maximum pressure rating stamped on a fitting
• DThe welder’s certification number

A field bend is made in steel line pipe. What is the primary concern if the bend radius is too sharp for the wall thickness and diameter?

• AWrinkling, ovality, or excessive thinning that can impair integrity
• BAutomatic increase of the pipe’s MAOP
• CElimination of the need for coating repair
• DConversion of the line to plastic pipe standards

Using the rule of thumb gallons ≈ 0.0408 × d² × L (d in inches, L in feet), about how many gallons fill 100 feet of 12-inch ID pipe?

• AAbout 294 gallons
• BAbout 470 gallons
• CAbout 588 gallons
• DAbout 940 gallons

What is the main purpose of a holiday detector (jeep) on coated pipeline?

• ATo find discontinuities or pinholes in the coating so they can be repaired
• BTo measure the gas flow rate in MCF per day
• CTo qualify the welder’s visual acuity
• DTo set the hydrostatic test pressure automatically

Minimum cover over a buried pipeline is measured from which reference to which reference?

• AFrom the top of the pipe to the finished ground or road surface elevation
• BFrom the bottom of the trench to the groundwater table only
• CFrom the coating thickness to the pipe ID
• DFrom the weld cap height to the pipe OD

In HDD installations, what is the purpose of drilling fluid (mud)?

• ATo stabilize the bore, remove cuttings, cool the bit, and reduce pullback friction
• BTo permanently replace the product pipe coating
• CTo increase the MAOP of the completed line
• DTo cure concrete encasement around the pipe

What is a common purpose of concrete coating or concrete weights on a submerged or flood-prone pipeline?

• ATo provide negative buoyancy so the pipe stays in place when submerged
• BTo eliminate the need for field welds
• CTo raise the operating temperature of the product
• DTo serve as the only form of corrosion protection

A trench is 250 feet long with an average cross-sectional area of 18 square feet. What is the excavation volume in cubic yards?

• A83 cubic yards
• B167 cubic yards
• C250 cubic yards
• D4,500 cubic yards

Why are pipeline markers installed along buried transmission and distribution rights-of-way?

• ATo warn the public and excavators of the pipeline’s presence and provide emergency contac…
• BTo measure exact wall thickness of the pipe
• CTo replace annual leak surveys
• DTo hold the pipe at design grade underground

What is “padding” in pipeline backfill terminology?

• AFine, rock-free material placed around the pipe to protect coating before general backfill
• BA temporary road mat used only for equipment travel
• CThe final asphalt wearing course over a road crossing
• DA type of welding electrode coating

During open-cut installation, why is trench bottom grade critical before lowering the pipe?

• AIncorrect grade can leave long unsupported spans, stress the pipe, or create low spots th…
• BGrade only affects paint color of the markers
• CGrade determines the welder’s API 1104 certificate number
• DGrade replaces the need for pressure testing

What is the typical sequence for an HDD pipeline crossing after planning and utility clearance?

• APilot bore, ream/enlarge, then pull back the product pipe
• BPull product pipe first, then drill the pilot hole
• CHydrotest only, then install without a bore
• DConcrete pave the river, then open-cut the channel

A contractor needs 1,200 cubic feet of select bedding. How many cubic yards should be ordered (no waste factor)?

• A24 cubic yards
• B44 cubic yards
• C56 cubic yards
• D1,200 cubic yards

Why might a contractor use rock shield or protective wrap over coated pipe in rocky trenches?

• ATo protect the coating from puncture by angular rock during backfill and settlement
• BTo increase the internal design pressure rating
• CTo eliminate cathodic protection requirements in all cases
• DTo allow welding without qualified procedures

What is a “pig launcher” or “pig receiver” used for on a pipeline system?

• ATo introduce or remove pipeline pigs for cleaning, batching, or in-line inspection
• BTo store holiday detectors overnight
• CTo hold trench boxes when not in use
• DTo heat fusion PE pipe automatically

When joining dissimilar metals or insulating a pipeline segment, what device is commonly installed?

• AAn insulating flange or isolating joint
• BA sacrificial trench jack only
• CA wooden trench shield as the only measure
• DA temporary road plate welded to the pipe

What is the purpose of a test station (test lead) on a cathodically protected pipeline?

• ATo provide access points for measuring pipe-to-soil potentials and monitoring CP performa…
• BTo launch cleaning pigs into the line
• CTo measure trench depth only during excavation
• DTo store welding rods at the ROW

A 6-inch ID pipe runs 500 feet. Using gallons ≈ 0.0408 × d² × L, approximately how many gallons will fill the pipe?

• AAbout 184 gallons
• BAbout 367 gallons
• CAbout 734 gallons
• DAbout 1,200 gallons

What is a key construction concern when installing pipe through a casing at a road or railroad crossing?

• AMaintaining casing alignment, protecting the carrier pipe coating, and installing require…
• BFilling the casing with loose scrap metal for weight
• CWelding the carrier pipe solidly to the casing for CP continuity in all designs
• DLeaving the annulus completely open to road salt without seals when seals are specified

Why is topsoil often stripped and stockpiled separately before trenching on a pipeline ROW?

• ATo allow proper restoration by replacing fertile topsoil on the surface after construction
• BTo use as the only approved pipe bedding in all soil types
• CTo permanently dispose of it off-site on every job
• DTo mix with concrete for pipeline weights

What does “tie-in” mean on a pipeline construction project?

• AConnecting a newly built section to an existing pipeline or completing the final joining…
• BOnly painting the markers yellow
• CRemoving all valves from the system permanently
• DFilling the trench without compacting

What is the primary purpose of a dike or secondary containment around an aboveground storage tank?

• ATo contain a release from the tank so product does not reach soil or surface water
• BTo support the weight of the tank shell
• CTo provide a walkway for gauging the tank
• DTo insulate the tank against temperature change

Which industry standard governs the in-service inspection, repair, alteration, and reconstruction of existing aboveground steel storage tanks?

• AAPI 650
• BAPI 653
• CASTM C143
• DAWS D1.1

Federal underground storage tank rules require overfill prevention equipment that automatically shuts off flow into the tank when the tank is no more than:

• A75 percent full
• B85 percent full
• C95 percent full
• D100 percent full

What does a spill catchment basin (spill bucket) at a tank fill pipe do?

• ACaptures the small volume of product that drains from the hose when it is disconnected
• BProvides the tank's only leak detection method
• CServes as the tank's secondary containment for a full release
• DVents vapors during delivery

Why are underground storage tanks anchored with hold-down straps and deadmen where the water table is high?

• AAn empty tank can float out of its excavation from buoyancy
• BStraps carry the weight of the product in the tank
• CAnchors are required to provide electrical grounding
• DStraps prevent thermal expansion of the tank shell

Which backfill is appropriate around an underground storage tank?

• AClean, washed, free-flowing material such as pea gravel or sand, as specified by the tank…
• BNative clay spoil containing rocks and debris
• CCrushed concrete rubble from the demolition
• DFrozen soil compacted in thick lifts

A buried steel tank uses sacrificial anodes. How does this system protect the tank?

• AThe anode corrodes preferentially, making the tank the cathode so it does not corrode
• BThe anode heats the tank so moisture evaporates
• CThe anode neutralizes the pH of the surrounding soil permanently
• DThe anode blocks stray current by insulating the tank

What is the advantage of a double-wall tank with interstitial monitoring?

• AA leak from the inner wall is detected in the annular space before product reaches the en…
• BIt eliminates the need for any overfill prevention
• CIt doubles the storage capacity of the tank
• DIt removes the requirement for corrosion protection on steel tanks

Before a newly installed tank system is placed in service, the installer normally must:

• APerform and document tightness testing of the tank and connected piping
• BFill the tank to capacity and watch for odors
• CWait 30 days for the backfill to settle
• DPaint the tank interior with a corrosion inhibitor

Why is an aboveground tank often built on an engineered ringwall foundation with compacted fill inside?

• AIt supports the shell perimeter uniformly and controls differential settlement of the tan…
• BIt eliminates the need for a tank bottom plate
• CIt increases the tank's rated pressure
• DIt replaces the requirement for secondary containment

Why are the delivery truck and the receiving tank bonded together before transferring a flammable liquid?

• ATo equalize electrical potential so static discharge cannot ignite vapors
• BTo provide power to the transfer pump
• CTo measure the quantity transferred
• DTo keep the hose from kinking

Why must tank vent lines be kept clear and never valved shut or plugged?

• AThe tank could be over-pressured while filling or collapse under vacuum while emptying
• BThe vent line carries product to the dispenser
• CThe vent provides the tank's cathodic protection current
• DThe vent line is the primary fill connection

A crew must enter a below-grade valve vault on a pipeline. What is the required approach?

• ATreat it as a permit-required confined space: test the atmosphere, ventilate, use an atte…
• BEnter quickly to limit exposure time
• CEnter after opening the lid for a few minutes
• DEnter with two workers so each can watch the other from inside

A vault or handhole located in a roadway must have a cover and structure that are:

• ARated for the vehicle loading of the location, such as an H-20 traffic rating
• BMade of the lightest material available for easy removal
• CSet at least six inches above the finished pavement
• DLeft unsecured so emergency crews can open them quickly

Before cutting or welding on a tank that has held flammable liquid, the tank must first be:

• AEmptied, cleaned, and rendered vapor-free or inerted, with atmosphere testing to confirm…
• BFilled with water to the top of the fill pipe only
• CLeft open overnight to air out
• DPressurized with air to hold back vapors

Which practice is correct when installing hold-down straps on a fiberglass underground tank?

• AUse the manufacturer's isolation pads and specified strap positions, tightened only to th…
• BTighten the straps as much as possible to eliminate all movement
• CPlace the straps at the tank's midpoint only
• DSubstitute chain for the strap material to save cost

Federal pipeline safety regulations require that combustible gas in a distribution line be odorized so that it is readily detectable by a person with a normal sense of smell at what concentration in air?

• AOne-fifth of the lower explosive limit
• BOne-half of the lower explosive limit
• CAt the upper explosive limit
• DAt 100 percent gas in air