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SOLAS Pipefitting practice questions

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Question 1Safety, Regulations and Code Requirements

Under SOLAS, which document is the primary international convention governing the design, construction, and equipment of ships, including piping systems?

  1. The International Convention for the Safety of Life at Sea Correct answer.
  2. The Convention on the International Regulations for Preventing Collisions at Sea
  3. The International Convention for the Prevention of Pollution from Ships
  4. The International Convention on Load Lines

Explanation

SOLAS stands for the International Convention for the Safety of Life at Sea, and it sets minimum safety standards for construction and equipment. Pipe systems carrying seawater, fuel, and firefighting media fall under its machinery and fire-safety chapters.

Question 2Safety, Regulations and Code Requirements

Which SOLAS chapter contains the requirements for fire pumps, fire mains, hydrants, and the fire main piping that a pipefitter installs?

  1. Chapter II-1, Construction
  2. Chapter V, Safety of navigation
  3. Chapter IV, Radiocommunications
  4. Chapter II-2, Fire protection, fire detection and fire extinction Correct answer.

Explanation

Fire pumps, fire mains, hydrants, and the associated piping are specified in SOLAS Chapter II-2, which covers fire protection, detection, and extinction. Chapter II-1 covers subdivision and machinery construction but not the fire main network itself.

Question 3Safety, Regulations and Code Requirements

When a pipefitter installs a fire main system, what is the minimum number of fire pumps required on a cargo ship of 1,000 gross tonnage or more under SOLAS?

  1. Two independent fire pumps Correct answer.
  2. Four independent fire pumps
  3. One independent fire pump
  4. Three independent fire pumps

Explanation

SOLAS II-2 requires at least two independently driven fire pumps on cargo ships of 1,000 gross tonnage and above. This redundancy ensures that a single pump failure does not leave the vessel without firefighting water.

Question 4Safety, Regulations and Code Requirements

In a SOLAS fire main system, what is the primary purpose of the isolation valve installed between the fire pumps and the fire main?

  1. To prevent seawater from back-flowing into the potable water system
  2. To regulate the pressure of water supplied to the hydrants during firefighting
  3. To drain the fire main after each periodic pressure test
  4. To allow the fire main to be isolated for maintenance while a pump remains available for other services Correct answer.

Explanation

An isolation valve lets a section of the fire main be shut off for repair or maintenance without draining the whole system or losing all pumping capability. This maintains a usable firefighting supply while work proceeds.

Question 5Safety, Regulations and Code Requirements

Under SOLAS, what is the minimum internal diameter of the fire main and hydrant branch piping on a cargo ship, unless the required capacity is otherwise achieved?

  1. 50 mm Correct answer.
  2. 80 mm
  3. 40 mm
  4. 25 mm

Explanation

SOLAS II-2 sets the minimum internal diameter of the fire main and its branches at 50 mm on cargo ships, unless the required water capacity can be delivered through a smaller diameter. The rule ties the diameter to capacity rather than size alone.

Question 6Safety, Regulations and Code Requirements

A pipefitter is laying out a fire main on a cargo ship. What is the required minimum pressure at any hydrant when two fire pumps are running simultaneously?

  1. 0.27 N/mm² Correct answer.
  2. 0.2 N/mm²
  3. 0.4 N/mm²
  4. 0.5 N/mm²

Explanation

SOLAS requires a minimum pressure of 0.27 N/mm² at any hydrant when two fire pumps are operating together on cargo ships. This ensures the jets can reach the required throw and height.

Question 7Safety, Regulations and Code Requirements

When installing a fire hydrant on a cargo ship under SOLAS, what is the maximum spacing permitted between hydrants on the deck?

  1. 40 m Correct answer.
  2. 50 m
  3. 20 m
  4. 30 m

Explanation

SOLAS specifies that fire hydrants must be positioned so that at least two jets of water, not emanating from the same hydrant, can reach any part of the deck. The resulting maximum spacing between hydrants is generally 40 m on cargo ships.

Question 8Safety, Regulations and Code Requirements

Which SOLAS requirement applies to the material of fire main piping and its fittings where they pass through accommodation spaces?

  1. They must be of copper-nickel only
  2. They must be of plastic approved for seawater service
  3. They must be of non-combustible material that retains strength at high temperature Correct answer.
  4. They may be of any material approved for potable water service

Explanation

Fire main piping and fittings must be constructed of non-combustible materials that retain strength when heated, so the system survives long enough to fight a fire. This is a core fire-integrity requirement for piping routed through accommodation and machinery spaces.

Question 9Safety, Regulations and Code Requirements

Under SOLAS, what is the purpose of the emergency fire pump on a cargo ship?

  1. To top up the potable water tanks during long voyages
  2. To supply water to the fire main when the main fire pumps are disabled by a fire in the machinery space Correct answer.
  3. To provide cooling water to the main engine during normal operation
  4. To supply water to the sprinkler system in the cargo holds

Explanation

The emergency fire pump is located outside the machinery space so that a fire there cannot disable all firefighting water supply. It provides an independent source of water to the fire main in that casualty scenario.

Question 10Safety, Regulations and Code Requirements

A pipefitter is installing the fuel oil piping for a ship's main engine. What SOLAS-related requirement governs the material and protection of fuel lines passing through accommodation spaces?

  1. Fuel lines must be routed through the accommodation space to shorten their length
  2. Fuel lines must be of steel or other approved material and be protected against accidental damage Correct answer.
  3. Fuel lines may be of flexible hose throughout the accommodation space
  4. Fuel lines must be insulated only against freezing

Explanation

SOLAS and the associated machinery rules require fuel oil lines to be of steel or another approved material and to be protected against accidental damage. Flexible hoses are restricted to short, approved lengths rather than full runs.

Question 11Safety, Regulations and Code Requirements

Under SOLAS, what is the purpose of a quick-closing valve on a fuel oil tank?

  1. To prevent fuel from freezing in cold weather
  2. To stop the flow of fuel from the tank in the event of a fire Correct answer.
  3. To regulate the fuel temperature entering the engine
  4. To measure the fuel consumption of the engine

Explanation

Quick-closing valves are fitted on fuel oil tanks so that fuel supply can be shut off remotely from outside the space in a fire emergency. This limits the fuel available to feed a machinery-space fire.

Question 12Safety, Regulations and Code Requirements

According to SOLAS, what is the required location for the controls of a quick-closing valve serving a fuel oil tank?

  1. Outside the space containing the tank, in a readily accessible position Correct answer.
  2. Inside the machinery space adjacent to the tank
  3. On the bridge only
  4. At the tank itself, below the liquid level

Explanation

The controls must be located outside the space containing the tank so they remain operable if a fire occurs in that space. They must also be readily accessible for prompt operation.

Question 13Safety, Regulations and Code Requirements

Which SOLAS chapter addresses the watertight integrity and subdivision of the hull, which directly affects the routing of bilge and ballast piping?

  1. Chapter III, Life-saving appliances and arrangements
  2. Chapter VI, Carriage of cargoes and oil fuels
  3. Chapter IX, Management for the safe operation of ships
  4. Chapter II-1, Construction, subdivision and stability, machinery and electrical installations Correct answer.

Explanation

Chapter II-1 covers subdivision and stability, including watertight integrity, which determines where bilge and ballast piping may penetrate bulkheads. Pipefitters must respect watertight boundaries and the associated penetration requirements.

Question 14Safety, Regulations and Code Requirements

When a bilge pipe penetrates a watertight bulkhead under SOLAS, what is the governing requirement for the penetration?

  1. The penetration may be left open as long as the pipe is above the waterline
  2. The penetration must be located below the light load line
  3. The watertight integrity of the bulkhead must be maintained by an approved watertight arrangement Correct answer.
  4. The penetration must be fitted with a wooden plug only

Explanation

Any penetration of a watertight bulkhead must preserve the bulkhead's watertight integrity, typically through an approved watertight fitting or closing arrangement. This prevents progressive flooding between compartments.

Question 15Safety, Regulations and Code Requirements

Under SOLAS, what is the purpose of the sounding pipes installed for tanks?

  1. To provide a route for the tank overflow
  2. To provide ventilation of the tank
  3. To allow the tank to be filled from the top
  4. To allow measurement of the liquid level in the tank Correct answer.

Explanation

Sounding pipes allow the crew to measure tank contents, typically with a sounding tape or rod. Their location and termination are regulated so that measurement is possible without opening the tank.

Question 16Safety, Regulations and Code Requirements

SOLAS requires air pipes for tanks to terminate where they will not admit water. What is the required termination arrangement for a fuel oil tank air pipe?

  1. It may terminate inside the machinery space near the tank
  2. It may terminate at the tank top with an open end
  3. It must terminate on the open deck with an approved flame arrester or equivalent Correct answer.
  4. It may terminate below the deck in a cofferdam

Explanation

Air pipes for fuel oil tanks must terminate on the open deck and be fitted with an approved flame arrester or equivalent device to prevent ignition of vapors. This keeps flammable gases away from ignition sources.

Question 17Safety, Regulations and Code Requirements

Under SOLAS, what is the minimum height above the deck at which an air pipe for a tank must terminate?

  1. 100 mm
  2. 760 mm Correct answer.
  3. 300 mm
  4. 200 mm

Explanation

SOLAS requires air pipes to terminate at a height of at least 760 mm above the deck or, where fitted, above the top of the bulwark or coaming. This height reduces the risk of water entering the tank.

Question 18Safety, Regulations and Code Requirements

Which SOLAS chapter governs the carriage of dangerous goods and the associated piping arrangements for cargo spaces?

  1. Chapter XI-1, Special measures to enhance maritime safety
  2. Chapter II-2, Fire protection
  3. Chapter VII, Carriage of dangerous goods Correct answer.
  4. Chapter XII, Additional safety measures for bulk carriers

Explanation

Chapter VII covers the carriage of dangerous goods, including the applicable codes and the arrangements for cargo spaces and associated systems. Piping serving such spaces must comply with the relevant code requirements.

Question 19Safety, Regulations and Code Requirements

A pipefitter is installing a seawater cooling line that penetrates the shell of a cargo ship below the waterline. What SOLAS-related fitting is required at the shell penetration?

  1. A wooden plug secured with wire
  2. An open-ended pipe extending through the shell
  3. A sea inlet valve fitted directly to the shell or to an approved sea chest Correct answer.
  4. A rubber sleeve clamped to the shell

Explanation

Sea inlet penetrations must be fitted with a sea valve attached directly to the shell or to an approved sea chest. This allows the opening to be closed against flooding if the line fails.

Question 20Safety, Regulations and Code Requirements

Under SOLAS, what is the purpose of the scuppers and overboard discharges being arranged so that they do not compromise watertight integrity?

  1. To prevent flooding of compartments through open discharge openings Correct answer.
  2. To increase the flow rate of the ballast system
  3. To reduce the noise of the discharge overboard
  4. To allow the crew to discharge oily water without treatment

Explanation

Scuppers and overboard discharges must be arranged so that water cannot enter the ship through them and flood internal spaces. This typically involves non-return arrangements or locating discharges above the relevant waterline.

Question 21Safety, Regulations and Code Requirements

Which SOLAS chapter sets requirements for the steering gear and the associated hydraulic piping?

  1. Chapter II-1, Machinery installations Correct answer.
  2. Chapter V, Safety of navigation
  3. Chapter III, Life-saving appliances
  4. Chapter VIII, Nuclear ships

Explanation

Steering gear and its hydraulic piping are covered under the machinery installation provisions of Chapter II-1. The rules require redundancy and arrangements to maintain steering capability.

Question 22Safety, Regulations and Code Requirements

Under SOLAS, what is the purpose of the fixed firefighting gas system piping in a machinery space?

  1. To provide cooling water to the engine
  2. To vent exhaust gases from the engine
  3. To distribute extinguishing gas throughout the protected space when activated Correct answer.
  4. To supply breathing air to the engine room

Explanation

Fixed gas system piping is designed to discharge extinguishing agent uniformly throughout the protected space to suppress a fire. The piping layout and nozzles must ensure adequate distribution.

Question 23Safety, Regulations and Code Requirements

A pipefitter is running a pipe through a watertight deck on a cargo ship. What arrangement best satisfies SOLAS watertight integrity requirements?

  1. A watertight penetration fitting that maintains the deck's integrity Correct answer.
  2. A clearance hole with the pipe left unsealed
  3. A wooden wedge driven around the pipe
  4. A flexible coupling with no sealing element

Explanation

Penetrations of watertight decks must use an approved watertight fitting that preserves the deck's ability to resist water passage. This prevents flooding from spreading between decks.

Question 24Safety, Regulations and Code Requirements

Under SOLAS, what is the requirement for the number of fire hydrants in a machinery space on a cargo ship?

  1. Hydrants are only required on the open deck
  2. Exactly four hydrants must be provided in the machinery space
  3. At least one hydrant must be provided in the machinery space Correct answer.
  4. No hydrant is required in the machinery space

Explanation

SOLAS requires at least one fire hydrant in the machinery space of a cargo ship so that a fire there can be attacked directly. Additional hydrants may be required depending on the space arrangement and size.

Question 25Pipe, Fittings, Valves and Materials

In SOLAS piping systems, which material property most directly governs the maximum allowable working pressure assigned to a carbon steel pipe spool at a given design temperature?

  1. The allowable stress value taken from the recognized code at that temperature Correct answer.
  2. The hardness of the pipe surface after hydrostatic testing
  3. The Charpy impact energy measured at the lowest expected service temperature
  4. The yield strength of the pipe at ambient laboratory conditions

Explanation

Allowable working pressure is derived from the pipe wall thickness, outside diameter and the code allowable stress at the design temperature. The allowable stress already accounts for temperature derating, so it is the governing property rather than ambient yield strength or hardness.

Question 26Pipe, Fittings, Valves and Materials

A class surveyor finds a seamless carbon steel fuel oil line joined by socket-welded fittings in a location where the line will be subject to fatigue and vibration. Which concern is most relevant to acceptance?

  1. Socket welds leave an internal crevice and stress concentration that reduce fatigue life Correct answer.
  2. Socket welds require post-weld heat treatment in every case
  3. Socket weld fittings are only permitted in copper nickel systems
  4. Socket-welded joints cannot be pressure tested by any recognized method

Explanation

Socket-welded joints create a geometric discontinuity and a residual gap at the pipe end, which concentrates stress and can initiate fatigue cracking under vibration. For highly stressed or fatigue-prone lines, butt welding is generally preferred to give a smooth bore and full penetration.

Question 27Pipe, Fittings, Valves and Materials

Which valve type is normally selected for a seawater cooling line where the valve must give tight shutoff and be operated frequently by hand?

  1. A globe valve with a metal seat
  2. A gate valve with a rising stem
  3. A butterfly valve with an elastomeric seat Correct answer.
  4. A swing check valve

Explanation

A resilient-seated butterfly valve offers tight shutoff, low operating torque and compact face-to-face dimensions, which suits frequent manual operation on large seawater lines. The elastomeric seat tolerates the abrasive and corrosive nature of seawater better than a metal-seated valve in this duty.

Question 28Pipe, Fittings, Valves and Materials

During a hydrostatic test of a new sea water piping system, at what pressure is the test normally conducted relative to the design pressure?

  1. At 1.5 times the design pressure, or as specified by the recognized code Correct answer.
  2. At 5 times the design pressure
  3. At exactly the design pressure
  4. At 0.5 times the design pressure

Explanation

Hydrostatic testing of piping systems is normally carried out at 1.5 times the design pressure, subject to the limits imposed by the recognized code and component ratings. The test verifies joint integrity and strength without exceeding the allowable stress limits of the components.

Question 29Pipe, Fittings, Valves and Materials

A piping system carries fuel oil at 60 degrees Celsius. Which gasket selection is most appropriate for a flanged joint in this service?

  1. A PTFE envelope gasket without any reinforcement
  2. A compressed non-asbestos fibre gasket rated for the fluid and temperature
  3. A spiral wound gasket with a graphite filler and stainless steel windings Correct answer.
  4. A plain rubber sheet gasket cut on board

Explanation

A spiral wound gasket with graphite filler and stainless steel windings is suitable for hydrocarbon service at elevated temperature, giving good recovery and creep resistance. It is a standard choice for fuel oil lines where temperature and fire risk must be considered.

Question 30Pipe, Fittings, Valves and Materials

Which material is normally specified for sea water piping where resistance to pitting and crevice corrosion is required and cost permits?

  1. Galvanized carbon steel
  2. Carbon steel with an internal cement lining
  3. Cast iron
  4. Copper nickel alloy Correct answer.

Explanation

Copper nickel alloys have good resistance to sea water corrosion, erosion and biofouling and are widely used for sea water systems on ships. They provide better pitting and crevice corrosion resistance than lined or galvanized carbon steel in flowing sea water.

Question 31Pipe, Fittings, Valves and Materials

A pipefitter is installing a flanged joint between two components of different materials in a sea water system. Which practice best reduces the risk of galvanic corrosion?

  1. Applying a heavy coat of thread sealant to the flange faces
  2. Increasing the bolt torque above the manufacturer's recommendation
  3. Inserting an insulating gasket and insulating washers and sleeves at the joint Correct answer.
  4. Using a thicker gasket to increase the separation distance

Explanation

Galvanic corrosion requires an electrical path between dissimilar metals through an electrolyte. An insulating gasket with insulating washers and sleeves breaks that path at the bolted joint, which is the standard mitigation for dissimilar metal connections.

Question 32Pipe, Fittings, Valves and Materials

In a piping system, what is the primary function of a spectacle flange (spectacle plate)?

  1. To absorb thermal expansion of the pipe run
  2. To regulate the flow rate of the fluid in the line
  3. To provide a positive visual indication of whether a line is open or blanked Correct answer.
  4. To allow the pipe to be disconnected without draining

Explanation

A spectacle flange carries a ring and a blind in one assembly, so rotating it gives a clear, visible change between an open bore and a positive blank. This is used for positive isolation where a visible confirmation of the line status is required.

Question 33Pipe, Fittings, Valves and Materials

A carbon steel pipe spool is to be welded to a stainless steel flange in a sea water line. Which measure is most important to preserve corrosion resistance at the joint?

  1. Using a nickel-based filler or approved transition piece and controlling dilution Correct answer.
  2. Applying a coat of primer before welding
  3. Grinding the weld cap flush with the parent metal
  4. Increasing the welding current to speed up the pass

Explanation

Dissimilar metal welds need a filler or transition that tolerates dilution between the two alloys without forming brittle phases or losing corrosion resistance. Nickel-based consumables are commonly used for carbon to stainless joints in sea water service.

Question 34Pipe, Fittings, Valves and Materials

Which property of a valve is described by its nominal pressure (PN) rating?

  1. The burst pressure of the valve body
  2. The maximum allowable working pressure at the reference temperature defined by the standard Correct answer.
  3. The torque required to operate the handwheel
  4. The flow coefficient of the valve at full open

Explanation

The PN rating expresses the maximum allowable working pressure at a reference temperature defined by the applicable standard. At higher temperatures the allowable pressure is reduced according to the material's pressure-temperature rating.

Question 35Pipe, Fittings, Valves and Materials

A pipefitter must join a small-bore copper pipe to a bronze valve in a fresh water system. Which jointing method is most common for this connection?

  1. Mechanical compression using a cast iron coupling
  2. Socket welding with a carbon steel fitting
  3. Shielded metal arc welding with a carbon steel electrode
  4. Silver brazing with a flux suitable for the alloys Correct answer.

Explanation

Silver brazing is the standard method for joining copper and bronze piping in fresh water systems because it produces a sound joint at temperatures well below the melting point of the parent metals. The flux must be matched to the alloys to remove oxides during heating.

Question 36Pipe, Fittings, Valves and Materials

A ballast line passes through a watertight bulkhead. Which arrangement is required for the pipe penetration?

  1. A rubber boot clamped around the pipe
  2. A simple sleeve with the annular space left open
  3. A watertight bulkhead fitting or penetration piece welded to the bulkhead Correct answer.
  4. A flanged joint bolted to the bulkhead face

Explanation

Where a pipe passes through a watertight subdivision, the penetration must maintain the watertight integrity of the boundary. A purpose-made watertight bulkhead fitting welded to the bulkhead achieves this and keeps the subdivision intact.

Question 37Pipe, Fittings, Valves and Materials

Which factor most strongly determines the required wall thickness of a steel pipe in a bilge system?

  1. The colour coding of the pipe
  2. The length of the pipe run between supports
  3. The number of flanged joints in the line
  4. The design pressure, outside diameter and allowable stress of the material Correct answer.

Explanation

Wall thickness for pressure containment is calculated from the design pressure, the outside diameter and the allowable stress of the material, with a corrosion allowance added. Other factors such as support spacing affect structural design but not the pressure containment thickness.

Question 38Pipe, Fittings, Valves and Materials

A non-return valve is to be fitted in a discharge line from a pump. Which installation detail is most important for correct operation?

  1. The valve must be installed with the flow arrow matching the direction of flow Correct answer.
  2. The valve must be installed with the stem pointing downwards
  3. The valve must be welded rather than flanged
  4. The valve must be fitted with a bypass line

Explanation

A non-return valve relies on flow to lift the disc or flap and on reverse flow to close it, so the body must be oriented with the flow arrow in the direction of the discharge. Incorrect orientation prevents the valve from seating and can cause it to remain open.

Question 39Pipe, Fittings, Valves and Materials

A fire main is fitted with a valve that must fail safe by opening if the actuator loses its control signal. Which valve and actuator arrangement is appropriate?

  1. A normally open valve with a spring-return actuator that closes on loss of signal
  2. A manually operated gate valve left locked open
  3. A normally closed valve with a spring-return actuator that opens on loss of signal Correct answer.
  4. A check valve installed in the branch line

Explanation

Fail-safe open means the valve must move to the open position when the control signal or power is lost. This is achieved with a spring-return actuator configured so the spring drives the valve open, with the valve normally closed and held shut by the actuator.

Question 40Pipe, Fittings, Valves and Materials

Which test is normally performed on a new piping system to confirm that the piping has been correctly installed and is free from leaks before it is put into service?

  1. A dye penetrant test of every flange
  2. A magnetic particle inspection of every weld
  3. A hydrostatic pressure test Correct answer.
  4. A radiographic examination of the whole system

Explanation

A hydrostatic pressure test is the standard method of proving the strength and tightness of a completed piping system before commissioning. Non-destructive examinations such as radiography or penetrant testing examine weld quality but do not prove system tightness.

Question 41Pipe, Fittings, Valves and Materials

A pipe run in a cargo oil system is supported by hangers. Which consideration is most important when selecting the hanger type?

  1. The hanger must be adjusted so the pipe is in tension
  2. The hanger must allow for thermal movement of the pipe while carrying the weight of the line Correct answer.
  3. The hanger must be made of the same material as the pipe
  4. The hanger must be welded directly to the pipe wall

Explanation

Piping hangers must support the dead weight of the pipe and its contents while allowing the pipe to expand and contract with temperature changes. Spring or sliding hangers are used where thermal movement must not be restrained.

Question 42Pipe, Fittings, Valves and Materials

A valve is marked with a pressure class of 150. What does this class number indicate?

  1. The maximum allowable working pressure in psi at the reference temperature of the rating standard Correct answer.
  2. The maximum flow rate through the valve in cubic metres per hour
  3. The number of bolts required for the flange
  4. The nominal bore of the valve in millimetres

Explanation

The class number is part of a pressure-temperature rating system in which the allowable working pressure decreases as the service temperature rises. It is not a bore size, flow rate or bolt count.

Question 43Pipe, Fittings, Valves and Materials

A pipefitter must fit a valve into a line that carries a fluid at high temperature and where the line must be isolated for maintenance without shutting down the whole system. Which arrangement best meets this need?

  1. A spectacle flange with one blank
  2. A single gate valve with a handwheel
  3. Two isolation valves in series with a drain valve between them Correct answer.
  4. A single check valve

Explanation

Double block and bleed uses two isolation valves with a drain between them so the space can be depressurized and confirmed tight before maintenance. This gives positive isolation while the rest of the system remains in service.

Question 44Pipe, Fittings, Valves and Materials

Which document normally specifies the pipe material, size and pressure rating for each system on a ship?

  1. The engine room general arrangement drawing only
  2. The piping system diagram and the associated pipe schedule Correct answer.
  3. The ship's stability booklet
  4. The cargo manifest

Explanation

Piping system diagrams show the arrangement and identify the lines, and the pipe schedule gives the material, size and rating for each system. Together they are the primary reference for pipefitting work.

Question 45Pipe, Fittings, Valves and Materials

A flanged joint in a steam line leaks after being tightened to the recommended torque. Which action is most appropriate?

  1. Depressurize, inspect the gasket and flange faces, and renew the gasket Correct answer.
  2. Apply a sealant to the outside of the joint
  3. Increase the bolt torque until the leak stops
  4. Leave the joint and monitor the leak

Explanation

A leaking steam joint indicates a damaged gasket, poor face condition or incorrect alignment, and the correct response is to depressurize and inspect before renewing the gasket. Further tightening may distort the flanges and does not correct the underlying defect.

Question 46Pipe, Fittings, Valves and Materials

Which statement correctly describes the purpose of a corrosion allowance in pipe wall thickness calculations?

  1. It replaces the need for any protective coating
  2. It adds extra thickness to compensate for metal loss over the service life of the pipe Correct answer.
  3. It reduces the design pressure used in the calculation
  4. It increases the allowable stress of the material

Explanation

A corrosion allowance is added to the calculated pressure thickness so that the pipe still has adequate strength after the expected metal loss over its service life. It does not change the design pressure or the allowable stress and does not remove the need for coatings.

Question 47Pipe, Fittings, Valves and Materials

A pipefitter is installing a pressure gauge on a fuel oil line. Which practice is most appropriate?

  1. Fit an isolating cock between the line and the gauge Correct answer.
  2. Use a gauge with a range below the normal working pressure
  3. Fit the gauge on the suction side of the pump only
  4. Weld the gauge directly to the pipe without any isolation

Explanation

An isolating cock allows the gauge to be removed or replaced without draining or depressurizing the line. It also protects the gauge and allows it to be isolated if it fails.

Question 48Pipe, Fittings, Valves and Materials

Which factor is most important when selecting the material for a pipe carrying compressed air at 30 bar?

  1. The number of bends in the line
  2. The pressure rating of the pipe and fittings at the design temperature Correct answer.
  3. The colour of the pipe coating
  4. The length of the pipe run only

Explanation

At 30 bar the pressure containment is the dominant design consideration, so the pipe and fittings must have a rating adequate for the pressure at the design temperature. Coating colour, run length and bend count do not determine whether the system can safely contain the pressure.

Question 49Pipe Layout, Measurement and Preparation

When laying out a pipe run on a vessel, which document is the primary reference for the routing, size, material and any special requirements of each line?

  1. The engine room equipment schedule
  2. The general arrangement drawing
  3. The piping arrangement and isometric drawings Correct answer.
  4. The welding procedure specification

Explanation

Piping arrangement drawings and isometrics define the route, dimensions, size, material and notes for each line, so they are the fitter's primary layout reference. General arrangement drawings show spaces and major equipment rather than individual line detail. The equipment schedule and welding procedure cover equipment data and welding technique, not routing.

Question 50Pipe Layout, Measurement and Preparation

A pipe run must rise from one deck to the next. Which fitting is used to change the direction of the run by 90 degrees within the same plane?

  1. A concentric reducer
  2. An elbow Correct answer.
  3. A blind flange
  4. A tee

Explanation

An elbow changes the direction of a pipeline, typically by 90 or 45 degrees, and is the standard fitting for a rise or turn in the same plane. A reducer changes bore size, a tee creates a branch, and a blind flange closes an opening. None of those changes the direction of the main run.