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Daily Quiz (182)


SSPC classifies non-metallic abrasive into three kinds, two of which are mineral and manufactured. What is the third class?


True or false: While there are some quantitative requirements for levels of cleanliness in SSPC/NACE abrasive blasting standards (less than 5% stains allowed in Near-White blast cleaning), qualitative rather than quantitative assessments must be made to determine compliance with these requirements.


What is the name of the Norwegian standards on coating and surface preparation?


True or false: With the ISO blast cleaning standards, the visual standards are an integral part of the written standard; that is, the reference to the applicable pictures is part of the written description.


SSPC-SP 10 allows staining to remain on how much of each unit area of the steel surface being cleaned?


True or false: Four SSPC abrasive blasting standards, organized from most to least rigorous, are SP 10, SP 7, SP 6, and SP 5.


How do you determine the particle size distribution of abrasive material used for blast cleaning?


What organization offers a standard that gives durability grades of low, medium and high for paint systems in various environments and levels of surface preparation?


True or false: In addition to SSPC-PA 17, there are two ASTM standards on measuring surface profile of blast-cleaned steel.


How is a water ring used?


True or false: A needle gage is used to measure water pressure in a UHP water jetting system.


True or false: The appearance of steel after blast cleaning is affected by the type of abrasive used, among other factors.


True or false: Dry ice pellets used as abrasive cannot produce a profile on steel.


True or false: Sponge jetting requires ultra-high pressure (UHP) water.


True or false: In air abrasive blast systems, the bull hose carries pressurized air and abrasive to the blast nozzle.


What is the subject of SSPC-Vis 7?


True or false: The Norsok M 501 standard on protective coatings was created by the Norwegian petroleum industry.


True or false: SSPC-SP 10 is typically specified as the level of surface preparation for the application of an inorganic zinc-rich coating.


True or false: Power tool cleaning is effective in removing soluble salts from a steel substrate.


What is a main difference between SSPC’s Commercial Grade Power Tool Cleaning and Power Tool Cleaning to Bare Metal?


Which of the following statements about SSPC-SP 11, Power Tool Cleaning to Bare Metal, is correct?


What do the terms “working mix” and “operating mix” refer to?


True or false: There are both pneumatic and electric remote controls for air abrasive blast systems.


What is normally meant by the phrase, “hold the blast?”


True or false: A wet blast system can use air pressure, rather than water pressure, as the cleaning force.


According to a JPCL article in July, how can flash rusting of newly abrasive-blasted steel be prevented or minimized?


True or false: According to a published study, elevated exposure to crystalline silica can result when it is present in coating materials being removed by blast cleaning.


True or false: Abrasive particle size, shape, and hardness all have an impact on the creation of surface profile.


What is a common name for the safety cut-out device at the blast nozzle of an abrasive blast system, which is connected to a pressure-relief valve on the blast pot?


True or false: Abrasive blast particles in an air abrasive blast system using a venture nozzle can achieve speeds of 450 mph or higher.


What organization publishes the Standard for the Preparation of Steel Substrates for PSPC?


Which method of blasting produces the least blast debris, presuming the same substrate in the same condition is being cleaned by each method?


What SSPC/NACE blast cleaning standard is equivalent to Sa 2, Thorough Blast Cleaning, in ISO 8501-1?


Which of the following statements about SSPC-SP 11, Power Tool Cleaning to Bare Metal, is true?


True or false: According to a recent JPCL article, planing is more effective than shotblasting in removing asphalt, latex, adhesives and other materials that are thicker than 2 mm from concrete floors.


True or false: A Schmidt Hammer is used for hand-tool cleaning of steel.


True or false: Research by Roper, Weaver, and Brandon has shown that the peak count of surface profile after blast cleaning has no bearing on coating performance.


True or false: Centrifugal blast cleaning can be both portable and stationary.


True or false: No stains of rust, mill scale, or old coatings are allowed after abrasive blast cleaning to SSPC-SP 5.


True or false: SSPC-VIS 1 photographs, depicting the appearance of steel before and after blast cleaning, can be used as substitutes for the written blast cleaning standards when blasted steel is being inspected for compliance with a specific standard.


What organization issued the 2006 publication Abrasive Blasting Hazards in Shipyard Employment?


What is the process called when steel shot is used to improve the fatigue properties of steel?


True or false: One ASTM Test Method for measuring profile on blast-cleaned steel describes the use of a portable stylus instrument.


True or false: Staurolite sand can be considered a “green” abrasive because it is an industrial byproduct.


True or false: ASTM has a test method for determining the size of abrasives.


If an abrasive fractures easily, it is said to be which of the following?


Olivine is what type of blasting abrasive?


True or false: OSHA has developed three sets of regulations on abrasive blasting in three primary industries: general industry, maritime, and construction.


How does one surface preparation industry expert, Dr. Lydia Frenzel, differentiate between flash rust and rust back?


True or false: The only ways to combine abrasive and water in a wet blast system are to inject water into a pressurized abrasive stream or to inject abrasive into a pressurized water stream.


What name is usually given to blasting abrasive residue that has been broken down into a powder?


What is the name of a blast cleaning abrasive manufactured by fusing the mineral bauxite at high temperature?


What happens to the condition of a steel substrate when waterjet cleaning is used to remove rust or existing coatings?


True or false: Though not described in a standard, one check for oil contamination of abrasives involves putting abrasive in a clean glass jar with clean water, putting a lid on the jar and shaking it, and then checking for an oil film on the surface of the water or coloration or cloudiness of the water itself.


True or false: Some of SSPC’s surface preparation standards are not published jointly with NACE.


True or false: In a JPCL article describing a study about surface preparation of repair mortars in wastewater treatment plants, the authors concluded that broom finishing was superior to abrasive blasting in producing surfaces for the successful application of protective coatings.


In abrasive blasting work, how small do dust particles have to be to make them respirable?


True or false: The speed of abrasive exiting a venture nozzle in an efficient air abrasive blasting system is typically about 200 mph.


True or false: The main reason for using citric acid to etch concrete is to create a profile coarser than that created by other etching agents.


What instrument or device is used to determine steel profile roughness/peak count requirements as required in SSPC-SP 17 and described in ASTM D4417?


True or false: OSHA now forbids the use of silica sand as a blasting abrasive.


How can a hygro thermometer be useful in coating work?


True or False: SSPC-SP 11, Power Tool Cleaning to Bare Metal, has no requirement for surface profile.


Press-O-Film is the name of what type of product?


SSPC-VIS 1, now called Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast Cleaning, was originally produced by what other standards organization?


True or False: Silica sand and coal slag abrasive with the same particle size distribution will produce different profile depth ranges on blast-cleaned steel.


What is the name for an abrasive’s resistance to breakdown on impact?


What kind of blasting abrasive is comprised of aluminum silicate?


Which of the following methods for measuring surface profile is not described in ASTM D4417, “Standard Test Method for Field Measurement of Surface Profile of Blast Cleaned Steel”?


In general, when is it better to use impact power tools (needle gun, roto peen) rather than rotary tools (wire brush, etc.)?


What is another name for the portable stylus instrument used to measure surface roughness of blast-cleaned steel?


SSPC/NACE standards for waterjet cleaning describe how many levels of cleanliness?


What organization created and sells rubber replica templates for determining the surface profile of concrete?


What is another name for “work mix?”


True or False: Wire bristle tools were recently classified as impact power tools in SSPC power tool cleaning standards.


What is a name sometimes given to the creation of microcracks in a concrete surface through use of impact, pulverizing, or other mechanical surface preparation methods?


What instrument would you use to analyze soluble salt contamination on abrasives?


What is the typical range for the peak-to-valley height of surface profile created on steel by power-tool cleaning to bare metal or abrasive-blast cleaning?


True or false: OSHA’s 2008 National Emphasis Program on Crystalline Silica explicitly identified abrasive blast cleaning as a high-exposure activity.


What description fits Initial Condition D of steel before blasting?


True or false: The number of peaks in a steel surface profile created by abrasive blast cleaning has no effect on coating performance.


What is the name of the industrial form of hydrochloric acid that is used to clean concrete and masonry?


What is another term for surface profile on steel?


True or false? The contractor is responsible for field testing for oil and soluble salt contamination of new mineral and slag abrasive media before use.


According to JPCL author David Dorrow, what makes an abrasive “green?”


True or false: All the SSPC surface preparation standards are issued jointly with NACE.


What pressure range would you want to see on a needle gage inserted behind the nozzle of a blast hose?


Which of the following answers organizes SSPC abrasive blasting standards from least to most rigorous?


Determining the particle size distribution of blast abrasive is achieved by what method?


True or false: Ultra-high-pressure (UHP) water jetting is generally ineffective in removing soluble salts from steel substrates.


True or false: The number of surface profile peaks in abrasive-blast-cleaned steel has no effect on coating performance.


True or false: In air abrasive blast cleaning of steel, a venture nozzle generates a deeper blast profile than a straight bore nozzle with the same diameter opening.


True or false: In abrasive blasting work, a dosimeter is used to measure exposure to abrasive blasting dust.


True or false: Some state highway departments have banned the use of silica sand for abrasive blasting.


True or false: Dry ice blasting produces a lesser volume of debris than the amount produced by air abrasive blasting using slag abrasive.


True or false: Rubber replica templates from the American Concrete Institute can be used to judge the degree of surface profile on concrete.


True or false: To hold the blast (prevent re-rusting of blasted steel) inside a tank, one effective measure is to use dehumidification to keep relative humidity below 50%.


True or false: A broom finish produces a coarse to very coarse finish on concrete.


Which of the following cleaning techniques is most likely to remove soluble salts from a heavily pitted steel surface?


True or false: There is an SSPC power tool cleaning surface preparation standard describing a degree of cleanliness that falls between Power Tool Cleaning, SSPC-SP 3, and Power Tool Cleaning to Bare Metal, SSPC-SP 11.


True or false: A research study by Roper, Weaver, and Brandon indicated that the number of peaks in a steel surface profile created by abrasive blasting has no effect on performance of coatings applied to the steel.


True or false: Acid etching does not produce a surface profile on concrete.


How are water and abrasive combined in wet abrasive blasting?


True or false: SSPC published a surface preparation standard, now discontinued, describing flame cleaning of steel.


What is the minimum surface profile required to meet SSPC’s specification, Power Tool Cleaning to Bare Metal?


True or false: Baking soda can be used as an abrasive in both wet and dry abrasive blast systems.


According to David Dorrow in a recent JPCL article, what constitutes a “green” abrasive?


When water under pressures of 30,000-40,000 psi is used to clean steel before painting, what is this form of cleaning called?


If you’re a contractor concerned with meeting the end condition appearance requirements for steel after blast cleaning, what precaution might you take?


Why are inhibitors used in wet blast systems?


A conductivity meter is normally used to check for what contaminants on abrasive for blasting?


True or false: One kind of wet blast system uses air rather than water pressure as the cleaning force.


According to SSPC's Surface Preparation Commentary for Steel and Concrete Substrates (SSPC-SP COM), final dry blast cleaning should not be conducted when the steel surface is less than how many Fahrenheit degrees above the dew point?


True or False: SSPC’s recent revisions to SSPC-SP 11 and SSPC-SP 15 changed the standards’ requirements for surface cleanliness and minimum surface profile.


Which one of the following agricultural materials is typically not used to create abrasives for blasting?


What is the name of a thin, weak layer of aggregate fines and unreacted constituents at the surface of recently poured concrete?


“Surface Preparation and Cleaning of Metals by Waterjetting Prior to Coating” is a newly revised standard by:


Which of the following statements about SSPC-SP 11, Power Tool Cleaning to Bare Metal, is true?


If a specification requires one of the following–brush-off blasting (SSPC-SP 7), commercial blasting (SSPC-SP 6), or near-white blasting (SSPC-SP 10), what other cleaning standard is invoked?


What organization recently issued a standard for measuring the profile of concrete after surface preparation?


In air abrasive blasting, why is it sometimes useful to adjust the angle of attack (angle of the nozzle in relation to the workpiece)?


Why must laitance and efflorescence be removed before coating concrete?


When abrasive is recycled without sufficient new abrasive being added to the operating mix, what happens to the surface profile of steel being cleaned?


True or False: The Australasian Corrosion Association is licensed to teach SSPC’s C7 Abrasive Blasting course.


Which of the following answers organizes SSPC abrasive blasting standards from most to least rigorous?


True or false: There is no quantifiable method for determining the surface profile on concrete substrates.


True or false: A combination of chemical stripping and (frozen) ice blasting has been used to remove lead-based paint from bridge steel.


True or False: Dehumidification equipment is sometimes used to “hold the blast” after surface preparation of the interior of a storage tank.


True or False: Generally speaking, a high-density abrasive will not clean as fast as a less-dense abrasive.


Among the options below, which is the most important in achieving the specified surface profile on steel when you are air abrasive blast cleaning?


What is a typical particle speed for abrasive in an air abrasive blast system that utilizes a venturi nozzle?


Which of the following conditions affect the efficiency of an air abrasive blasting system?


True or false: In air abrasive blasting operations, the same particle size mix of silica sand and coal slag yield different profile ranges on steel.


True or false: If you are removing a soft, pliable coating from a steel surface, a rounded abrasive will be more productive than an angular one.


The SSPC/NACE/AWS specification for thermal-sprayed zinc in a marine service environment requires what degree of blast cleaning?


How can sponge blasting produce a profile on steel?


What happens to the existing profile on steel when UHP water blasting is used to remove rust and/or coatings?


What is the name usually given to a robotic surface preparation machine used in the field on ship and tank exteriors?


What are abrasive fines?


A reduction in air abrasive blast nozzle pressure from 100 psi to 80 psi has what effect on the productivity of the blasting operation?


True or false: Use of crystalline silica sand has now been banned from use as a blasting abrasive in the United States.


True or false: Abrasive blasting and other scarification techniques increase the surface area of a steel substrate and provide additional reactive sites for molecular association between paint and metal.


True or false: Potable water without additional treatment is often used successfully for UHP water jetting prior to painting.


Which technique would be least likely to remove soluble salts from a steel substrate?


Which of the following is most likely to be the result of excessive profile depth on steel after blast cleaning?


If you need to answer a question about the surface profile requirements for blasted surfaces on a job, what document would you consult?


A stationary centrifugal wheel blast machine typically uses what type of abrasive?


True or false: ISO Sa2.5, describing very thorough abrasive blast cleaning, gives a more comprehensive written description of the end condition of the steel after blasting than SSPC SP 10/NACE No. 2, Near white metal, which requires a similar end condition.


Which of the following factors influences the appearance of steel after blast cleaning?


With SSPC abrasive blasting standards, if a Near White Blast Cleaning (SSPC-SP 10) is required, the following additional standard is invoked:


The ISO surface preparation standard Sa 3 most closely resembles what SSPC/NACE surface preparation standard?


Which of the following range of readings would you most likely see on a needle pressure gage inserted behind the nozzle of a blast hose?


Power tools, such as power wire brushes, can burnish or polish a steel surface. What is the main problem with this?


Which of the following cleaning techniques is least likely to remove soluble salts from a steel surface?


True or false: In abrasive blasting, the harder the abrasive, the deeper the profile it is likely to generate.


Which of the following statements about SSPC-SP 11, Power Tool Cleaning to Bare Metal, is correct?


A White Metal Blast, SSPC-SP 5, allows what to remain on the surface after blast cleaning?


What would be the most likely result of excessive profile on a steel substrate after abrasive blasting?


In general, when is it better to use impact (needle gun, roto peen) rather than rotary (wire brush, coated abrasive) power tools?


True or false: Potable water in a UHP water jetting system is normally of sufficient cleanliness that it will not deposit detrimental contaminants on a steel surface.


What is likely to be the result of oil in the compressed air used for abrasive blast cleaning?


Which of the following persons has conducted research and published articles in JPCL and elsewhere on flash rusting after water jetting?


Why is it sometimes useful to adjust the angle of attack (angle of the nozzle in relation to the work piece) when conducting air abrasive blasting?


In air abrasive blasting operations, how is a moisture separator or filter used?


SSPC's photographic guides for visual assessment of surface cleanliness after blast cleaning are designed to be used in what way?


What is the purpose of inhibitors used in wet blast systems?


Power tools such as power wire brushes can burnish or polish a steel surface. Why is this sometimes a problem?


What is most likely to help you achieve the specified profile on the steel you are blast cleaning?


A conductivity meter can be used to check for what contaminant on abrasive?


True or false: A research study by Roper, Weaver and Brandon indicated that the number of peaks in a steel surface profile created by abrasive blast cleaning affects coating performance.


True or false: CO2 blasting can produce a profile on steel.


Which of the following is not used for measuring the surface profile of cleaned steel?


What is the main reason for a sieve analysis of abrasive?


Sulfate-reducing bacteria contribute to corrosion by what mechanism?


Surface profile on steel, measured as peak-to-valley height of the roughness, has several other names, including which of the following.


Which of the following abrasive types is normally the hardest?


What is abrasive friability?


In its Technology Update on retrieving soluble salts from a steel substrate in the field, SSPC describes two methods. One is swabbing; what is the other?


A needle scaler is what type of power tool?


True or false: Rubber replica templates from the American Concrete Institute can be used to judge the degree of profile on concrete substrates after surface preparation.


Which of the following can cause excessive surface profile?


True or false: In protective coatings work, "smut" refers to the metallic fines that cling to a steel substrate after it is cleaned with metallic abrasive.


 
 
   

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