CSWIP 3.4U Underwater Inspection Controller / Inspection Engineer (TWI, UK)

What is the primary operational role of a CSWIP 3.4U Underwater Inspection Controller during an offshore inspection campaign?

• AExecuting physical wet welding repairs on subsea structural members
• BTopside direction of diver and ROV NDT activities, video logging, data validation, and an…
• CDesigning cathodic protection retrofits for offshore platforms
• DOperating heavy trenching equipment for subsea pipeline burial

Which document serves as the primary technical baseline for a CSWIP 3.4U Controller when setting up the daily subsea inspection tasks?

• AThe Inspection Scope of Work (Work Scope) and Inspection Plan
• BThe Vessel Engine Room Logbook
• CThe Commercial Diving Medical Certificate
• DThe Topside Catering Safety Schedule

In subsea inspection database systems like Coabis or C-View, what is the main purpose of an Anomaly Tracking System (ATS)?

• ATo monitor fuel consumption of the diving support vessel
• BTo record, classify, track, and manage structural defects across multi-year inspection cy…
• CTo calculate diver saturation decompression times
• DTo generate automated invoices for offshore catering

Before initiating diver or ROV inspection work near a production platform's seawater intake, what critical safety precaution must the 3.4U Controller confirm?

• AThe intake pumps are running at maximum capacity to improve water clarity
• BA valid Permit-to-Work (PTW) is issued and intake pumps are isolated / locked out (LOTO)
• CThe water temperature at the intake is recorded on the video screen
• DThe diver is equipped with an ultrasonic thickness gauge

During Simultaneous Operations (SIMOPS) on an active production platform, which authority has ultimate control over approving subsea inspection activities?

• AThe Offshore Installation Manager (OIM)
• BThe ROV Pilot Technician
• CThe Lead NDT Diver
• DThe Vessel Cook

When planning an ACFM weld inspection scope on a coated jacket structure, what key operational advantage does ACFM offer over traditional MPI?

• AACFM requires complete removal of marine growth and paint down to bare bright metal
• BACFM can detect and size surface-breaking cracks through non-conducting paint coatings up…
• CACFM operates without any electrical power source
• DACFM automatically repairs fatigue cracks during the scan

What is the primary function of a Query Note (QN) issued by a CSWIP 3.4U Controller during an offshore campaign?

• ATo request additional catering supplies for the inspection team
• BTo formally request technical clarification or deviation approval from the client's struc…
• CTo report vessel propulsion failures to marine authorities
• DTo record diver breathing gas consumption rates

Which factor must a 3.4U Controller prioritize when scheduling close visual inspection (CVI) of jacket node welds in high tidal current areas?

• AConducting CVI during peak spring ebb tide
• BScheduling CVI operations strictly during slack water windows to ensure diver stability a…
• CIncreasing ROV thruster power to 100% while diver is in the water
• DTurning off topside video recording during strong currents

How should a CSWIP 3.4U Controller organize inspection data files to ensure traceability across a complex offshore platform jacket?

• ABy random order based on date of recording only
• BBy structuring folders according to structural component IDs (e.g., Structure / Elevation…
• CBy grouping files according to diver name only
• DBy storing all data in a single unorganized root directory

Which pre-inspection activity is mandatory before deploying an ultrasonic thickness (UT) gauge subsea?

• APainting the transducer head with anti-fouling paint
• BVerifying velocity calibration on a calibrated step block at ambient subsea temperature a…
• CSoaking the probe in freshwater for 24 hours
• DHeating the subsea cable to 50°C

A 3.4U Controller is managing an ROV pipeline survey where a 40-meter un-supported pipeline free span is discovered. What immediate management action is required?

• AIgnore the span and continue the video survey to the pipeline end
• BLog exact touchdown coordinates, measure span height and length, evaluate against critica…
• CInstruct the ROV pilot to land the ROV on top of the unsupported pipe span
• DRequest the vessel captain to drop anchor directly on the free span

In managing a subsea inspection contract, what is the significance of the 'Inspection Reference Level' (usually LAT or Mean Sea Level)?

• AIt defines the salinity calculation baseline for CP probes
• BIt provides the standardized vertical datum from which all subsea component elevations an…
• CIt sets the maximum speed of the diving support vessel
• DIt determines the electrical voltage of topside video monitors

When planning an inspection of impressed current cathodic protection (ICCP) anodes on a platform jacket, what safety protocol must be enforced?

• AEnsure ICCP system power remains at 100% output while diver touches the anode
• BVerify ICCP power isolation under PTW/LOTO to prevent electrical shock or stray current h…
• CRequire the diver to wear rubber gloves while inspecting live 440V ICCP anodes
• DIncrease seawater salinity around the anode

Which standard video overlay information is mandatory on subsea inspection video recordings according to CSWIP 3.4U guidelines?

• ATopside room temperature and cook's menu
• BDate, time code, platform name, component/node ID, water depth, and inspection task
• CVessel captain's name and satellite television channel
• DROV thruster RPM and hydraulic oil temperature

How often should a subsea Cathodic Protection (CP) contact probe be verified against a reference calibration cell topside?

• AOnce every 5 years
• BDaily before and after each subsea inspection shift (pre- and post-dive calibration check)
• COnly when the probe tip breaks
• DNever, CP probes are factory calibrated permanently

What is the acceptable variance threshold when comparing pre-dive and post-dive CP probe calibration readings?

• A±500 mV
• B±10 mV
• C±100 mV
• D±2.5 V

In subsea magnetic particle inspection (MPI), what minimum ultraviolet light intensity (UV-A) must be verified at the inspection surface?

• A100 µW/cm²
• B1,000 µW/cm² (10 W/m²)
• C50,000 µW/cm²
• D10 µW/cm²

What ambient white light level limit must be maintained in an MPI inspection area to avoid masking fluorescent indication visibility?

• AMaximum 20 lux
• BMinimum 500 lux
• CExactly 1,000 lux
• DWhite light level is irrelevant for fluorescent MPI

When validating subsea ultrasonic digital thickness (UT) logs, what phenomenon can cause false thin-wall readings on severely pitted steel plates?

• ADoubling effect caused by second harmonic reflections
• BMid-wall laminations or inclusions reflecting the sound beam prematurely back to the tran…
• CExcessive battery voltage in the topside display unit
• DHigh water clarity slowing down acoustic velocity

In ACFM inspection data validation, what signature pattern on Bx and Bz channels confirms a true surface-breaking fatigue crack?

• AA flat horizontal line on both Bx and Bz
• BA downward dip in Bx corresponding with a peak-and-trough (butterfly) loop in Bz
• CA sharp increase in Bx accompanied by zero signal in Bz
• DSinusoidal oscillations in Bx only

What is the role of a Daily Progress Report (DPR) generated by the CSWIP 3.4U Controller at the end of each offshore shift?

• ATo summarize dive hours, ROV operational hours, completed inspection scopes, findings, we…
• BTo record personal conversations between vessel crew members
• CTo request replacement of vessel anchor winches
• DTo calculate diver tax withholdings

What QA step is mandatory if an NDT diver's magnetic yoke fails the daily lifting capacity lift test?

• AIncrease the diver's breathing gas pressure to compensate
• BReject the yoke, replace with a calibrated unit, and re-inspect all areas examined with t…
• CAllow the diver to continue inspection provided the ink is fresh
• DRecord the test failure in the logbook but accept the inspection data

What is the minimum lifting capacity required during pre-dive checks for an AC electromagnetic yoke used in subsea MPI?

• A4.5 kg (10 lbs) at maximum pole spacing
• B1.0 kg (2.2 lbs)
• C25.0 kg (55 lbs)
• D100 kg (220 lbs)

During digital video logging, a 3.4U Controller notices video corruption (screen flicker and frame drop) on 15 minutes of critical node weld inspection. What is the correct QA procedure?

• AAccept the corrupted video if the diver verbally reported no cracks
• BReject the corrupted segment and instruct the diver/ROV to re-inspect and re-record the n…
• CEdit out the corrupted 15 minutes and shorten the inspection log
• DUse artificial intelligence software to generate fake replacement video frames

What acoustic velocity value must be programmed into a digital UT meter when measuring wall thickness of carbon steel structural members subsea?

• A1,480 m/s
• B5,920 m/s (approx. 5,900–5,940 m/s)
• C3,230 m/s
• D330 m/s

In subsea magnetic particle inspection, how is the black magnetic ink concentration verified using a standard ASME settling tube?

• ABy measuring the electrical resistance of the ink mixture
• BBy allowing a 100 ml sample to settle for 30 minutes and reading the settled magnetic par…
• CBy heating the liquid until it boils
• DBy measuring the acidity (pH) of the carrier fluid

What is the primary difference between Close Visual Inspection (CVI) and General Visual Inspection (GVI)?

• AGVI requires cleaning to bare metal, while CVI is performed from a moving boat
• BGVI is a visual scan to detect gross damage/marine growth, while CVI is an intense close-…
• CCVI is performed only by ROVs, while GVI is performed only by divers
• DThere is no difference; they are interchangeable terms

Which surface cleanliness standard is required prior to carrying out subsea Magnetic Particle Inspection (MPI) on a tubular weld joint?

• ANo cleaning required; MPI works through heavy kelp and barnacles
• BCleaned to bare bright metal (ISO 8501-1 SA 2.5 equivalent) removing all marine growth, s…
• CLight scraping to remove loose seaweed only
• DHigh-pressure air blasting only

What type of ultrasonic probe is standard for measuring remaining wall thickness on corroded subsea pipe walls?

• ADual-element (twin-crystal) zero-degree compression wave probe
• B70-degree shear wave angle probe
• CSingle-element 45-degree probe
• DSurface acoustic wave (SAW) probe

Which reference electrode is universally used as the standard half-cell for taking subsea Cathodic Protection (CP) potential measurements?

• ACopper / Copper Sulfate (Cu/CuSO4)
• BSilver / Silver Chloride (Ag/AgCl / seawater)
• CCalomel electrode
• DZinc / Zinc Oxide dry cell

What CP potential reading range indicates that a subsea carbon steel platform jacket is adequately protected against marine corrosion (vs Ag/AgCl)?

• A-0.200 V to -0.500 V
• B-0.800 V to -1.050 V (-800 mV to -1050 mV)
• C-1.500 V to -2.000 V
• D+0.800 V to +1.050 V

What is the primary risk associated with over-protecting high-strength steel subsea components (potentials more negative than -1100 mV vs Ag/AgCl)?

• ARapid bio-fouling acceleration
• BCathodic hydrogen embrittlement leading to sudden brittle cracking
• CMelting of the steel member
• DExcessive magnetizing of the platform jacket

In subsea Flooded Member Detection (FMD), how does an ultrasonic compression wave probe detect water ingress inside a hollow jacket brace?

• AIf air-filled, the sound reflects entirely off the inner steel wall; if water-filled, sou…
• BBy measuring the electrical resistance of the steel outer surface
• CBy measuring the magnetic field strength inside the brace
• DBy heating the brace wall and monitoring thermal expansion

What is the key advantage of Radiographic FMD (using a gamma ray source like Cobalt-60 or Cesium-137) over Ultrasonic FMD?

• ARadiographic FMD does not require any radiation safety exclusion zone
• BRadiographic FMD can inspect heavy marine-fouled or corroded members without requiring su…
• CRadiographic FMD equipment costs less than $100
• DRadiographic FMD recharges CP anodes during the scan

When inspecting subsea welds using Alternating Current Field Measurement (ACFM), what do the Bx and Bz channels physically measure?

• ABx measures flaw depth (parallel to surface); Bz measures flaw length/ends (perpendicular…
• BBx measures water temperature; Bz measures electrical voltage
• CBx measures steel density; Bz measures weld bead height
• DBx measures acoustic echo amplitude; Bz measures frequency shift

Which non-destructive technique is most suitable for detecting subsurface volumetric defects (such as porosity or slag inclusions) in subsea structural welds?

• AVisual Inspection (CVI)
• BUltrasonic Shear Wave Angle Beam Testing (UT)
• CCathodic Protection probe survey
• DSurface Eddy Current Testing

When selecting NDT methods for an ROV-deployed inspection scope, why is ACFM preferred over MPI?

• AMPI cannot be performed by ROVs because black magnetic particles cannot stick to steel in…
• BACFM provides electronic digital data, quantitative depth sizing, works through coatings,…
• CACFM requires zero electrical power from the ROV tether
• DMPI is illegal under UK HSE regulations

In subsea Pulsed Eddy Current (PEC) testing of insulated or marine-fouled subsea pipelines, what parameter does PEC primarily measure?

• AAverage wall thickness over the sensor footprint area through insulation and coatings
• BExact surface fatigue crack length
• CInternal gas pressure inside the pipeline
• DWater flow velocity around the pipe

A 3.4U Controller evaluates a subsea weld joint using a 45-degree shear wave UT probe. If a flaw echo appears at a sound path distance of 50 mm, what formula is used to calculate the surface distance (skip distance) to the reflector?

• ASurface Distance = Sound Path × sin(Angle) [50 × sin(45°) = 35.4 mm]
• BSurface Distance = Sound Path ÷ cos(Angle)
• CSurface Distance = Sound Path × 2
• DSurface Distance = Sound Path + 45

In offshore tubular jacket structures, what term defines the intersecting connection point where brace members meet the main leg or chord?

• ANode (or Tubular Joint)
• BSplash zone clamp
• CAnode stub
• DPipeline riser

When referencing location along a tubular joint weld, what are the four standard geometric positions on a node joint weld circumference?

• ANorth, South, East, West
• BCrown Toe, Crown Heel, Saddle 1, Saddle 2
• CTop, Bottom, Left, Right
• DAlpha, Beta, Gamma, Delta

What region of an offshore platform jacket experiences the highest rate of atmospheric, splash, and marine corrosion?

• AThe deep seabed mudline zone (-150 m)
• BThe splash zone (intertidal area subject to alternate wetting, drying, and wave action)
• CThe fully submerged seabed pile zone
• DInside sealed flooded members

What is the primary integrity concern associated with a subsea pipeline free span resting above a scoured seabed?

• AExcessive pipeline heating
• BVortex-Induced Vibration (VIV) causing rapid fatigue cracking and excessive bending stress
• CDiscoloration of the external yellow jacket coating
• DAccumulation of marine growth on the seabed

In subsea pipeline inspection, what does the abbreviation TDP stand for?

• ATotal Depth Pressure
• BTouchdown Point (where a flexible riser or pipeline meets the seabed)
• CThermal Expansion Pipe
• DTransverse Direction Path

What type of structural damage occurs when a floating vessel collides with an offshore jacket leg brace?

• APitting corrosion
• BDent, localized gouging, and overall member out-of-straightness (bending)
• CHydrogen embrittlement
• DGalvanic anode dissolution

In evaluating a dent on a subsea pipeline, how is dent depth percentage typically calculated relative to outer diameter (D)?

• ADent Depth % = (Maximum Dent Depth d ÷ Nominal Pipeline Outer Diameter D) × 100
• BDent Depth % = (Dent Length ÷ Pipe Wall Thickness) × 100
• CDent Depth % = (Water Depth ÷ Pipeline Length) × 100
• DDent Depth % = (CP Potential ÷ 1000) × 100

What is the function of a concrete weight coating (CWC) applied over an offshore subsea pipeline?

• ATo provide negative buoyancy for seabed stability and mechanical protection against ancho…
• BTo improve internal hydrocarbon flow velocity
• CTo act as a primary electrical conductor for ICCP current
• DTo prevent marine growth from attaching to the seabed