Quiz 7

For the location of an AE source, three sensors are used to locate a source to a point by intersecting
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cracks causea disruption in the circular patterns of eddy currentacoustic emission does not obtain quantitative results about size, depth, and overall acceptability of a part defectTrueThe ring test involves usingAcoustic emission as a means of inspectionWhat type of bond is used to secure an acoustic emissions for piping inspectionsgluein acoustic emissions, preamplifiers amplify the initial signal. typical amplification gain40 or 60 dBdrawbacks of eddy current areequipment can be expensiveacoustic emissions can be used in loud service environment which contribute noise picked up by the signalsfalseeddy current gets its name fromeddied that are formed when a liquid or gas flows in a circular path around obstacles when conditions are righteddy current array testing encompasses complex geometriestrueeddy current test usesAC current sent through a coil to create an eddy current in the part to be inpectedThe term Ferromagnetic means:A material, as iron, Nickel, or cobalt, having a high magnetic permeability which varies with the magnetizing forceto properly inspect a part for cracks or other defects,it is important to become familiar with the different types of magnetic fields and the equipment used to generate them.The earliest known use of magnetism to inspect an object took place as early as 1868. What was checked for defects?Cannon BarrelsThis type Magnetic particle setup is used to inspect parts that have an open center, such as gears, tubes, and other ring-shaped objects.Central ConductorIn magnetic particle inspection, a magnet or electrical current is used to establish a magnetic field in the objectTrueDry particles with half wave AC is the best approach when inspecting for lack of root penetration in welds of thin materials.FalseWet method magnetic particles products differ from dry powder products in a number of ways. One way is that both visible and fluorescent particles are available.TrueFluorescence is defined asthe property of emitting radiation as a result of and during exposure to radiation.Magnetism is used in nondestructive testing and evaluation to find flaws in magnetic materials such assome types of steel and ironMagnetic Field Indicators allow forDetermining whether a magnetic field is of adequate strength.The field forced out into the air by the distortion of the field within a part caused by the presence of a discontinuity is known asLeakage FieldThe term black light originates from the fact that ultraviolet radiation is visible to the human eye and is, therefore, characterized as being black.FalseThe indications produced using the wet magnetic particles are less sharp than dry particle indications formed on similar defects.FalseThe pie gage has several disadvantages. Name one.Retains some residual magnetism - indications will prevail after removal of the source of magnetizationSuspension liquids used in the wet magnetic particle inspection method can be either a well refined light petroleum distillate or water containing additivesTrueMagnetic particle inspection cannot be used in underwater inspection of items such as offshore structures and underwater pipelines.FalseAn electromagnetic yoke is basically made by wrapping an electrical coil around a piece of soft ferromagnetic steel. A switch is included in the electrical circuit so that the current and the magnetic field can be turned on and off.TrueAt what angle to the magnetic field will flaws produce the strongest indications because they disrupt more of the magnet flux.90One of the advantages of QQIs are:they can be reused with careful application and removal practices.One of the advantages that a magnetic particle inspection has over some of the other nondestructive evaluation methods is that flaw indications generally resemble the actual flaw.TrueGas cylinders which fail are normally re-used as part of the testing protocol to avoid the dangers inherent in them.FalseIf high pressure gas were used,then the gas would expand with its compressed volume resulting in an explosion, with the attendant risk of damage or injury.In Hydrostatic testingWater is commonly used because it is cheap and easily available, and is usually harmless to the system to be testedFerrite testing can help prevent potential failures and the chance of increased costs of maintenance due to corrosion or cracking of parts, or mechanical failures.TrueOne advantage to Ferrite testing isTesting instrument meets all requirements of ANSI/AWS A4.2 and DIN EN ISO 8249Stainless steel has two forms,austenitic and duplexWhat is the Ferrite content of duplex stainless steel?35% to 65%Hydrostatic testing begins with filling a component withliquid, often water, until the pressure reaches a specified level.What is the Ferrite content of austenitic stainless steel?4 to 8 percentWhat type of material testing will carry out this type of test to make sure that the stainless steel being used in or for various processes is properly tough, is resistant to corrosion and will not crack.FerriteBoth austenitic and duplex stainless steels are composed similarly.FalseTesting of pressure vessels for transport and storage of gases is very important becauseTesting of pressure vessels for transport and storage of gases is very important becauseCarbon, nitrogen, nickel and manganese are austenite formers.TruePressure tightness can be tested byturning on the supply valve and observing whether there is a pressure loss.300 series stainless materials like 304/L and 316/L are magnetic.FalseSmall pressure vessels are normally tested using awater jacket test.Hydro-testing of pipes, pipelines and vessels is performed to exposedefective materials that have missed prior detection,What type of testing is a process used to inspect equipment such as fire extinguishing cylinders, storage tanks, gas cylinders and chemical pipelines, through use of a hydrostatic tester?HydrostaticFerrite testing verifies whether heat treatment applied to the material has reached the required performance balance. It also showswhether there are any damaging third phases in materials, which could later inhibit the performance of stainless steels.Buried high pressure oil and gas pipelines are tested for strength by pressurizing them to at least125% of their maximum allowable working pressure (MAWP) at any point along their length.