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Daily Quiz (86)


True or false: Abrasive particles in an efficient air abrasive blast system typically travel at a speed of 100 miles per hour.


True or false: Elastomeric coatings are easier to remove by blast cleaning than brittle coatings.


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: Some portable shot blast machines utilize a centrifugal wheel blasting apparatus.


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


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: SSPC has a blast cleaning standard for non-ferrous metals such as architectural aluminum.


Breathing grade compressed air (Grade D, as specified by the Compressed Gas Association) must contain what percentage of oxygen by volume?


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


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.


True or false: Both wet and dry ice have been used as abrasives in abrasive blasting operations.


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


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


True or false: Steel cleaned by abrasive blasting to a condition of SSPC-SP 5, White Metal Blast Cleaning, can look different from job to job.


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


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


True or false: Agricultural blast cleaning abrasives are made from walnut shells, corn cobs, and peach pits, among others.


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.


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 type of respiratory protection is required for air abrasive blasting?


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


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?


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


Centrifugal wheels are used in what kind of equipment?


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


Respirators must be approved for use by what organization?


In what kind of work do you hear the term, “operating mix?”


What is the source of potential inhalation hazards that blasters face in air abrasive blasting operations?


True or False: A low-pressure, low-impact abrasive blasting process using a blend of walnut shells and staurolite sand has been developed for cleaning architectural sheet metals and other substrates.


True or False: In August this year, OSHA issued a proposed rule banning use of crystalline silica as a blasting abrasive.


Why is crystalline silica sand more likely to cause silicosis when it is used for abrasive blasting, as opposed to when it blows around on a beach?


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?


Surface roughness and peak count of abrasive-blasted steel are the subject of what SSPC standard?


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


True or False: OSHA has lowered the permissible exposure limits on crystalline silica.


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


True or False? Fines are the most productive particles in the working mix of blast abrasive.


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


True or False: Sponge blasting employs particles of sponge as abrasive.


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


Which of the following SSPC abrasive blast cleaning standards requires the most rigorous degree of cleaning of steel?


Why should the surface temperature of steel be at least 5 degrees higher than the dew point temperature before you blast-clean or paint?


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


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.


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


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.


Abrasive blast workers are regularly exposed to noise in excess of what level?


What happens to carbon steel when it loses its oxide layer, millscale, in the abrasive blasting process?


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


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


Why is crystalline silica sand more likely to cause silicosis when used as an air abrasive blasting material than it is in its natural state, for instance, as beach or river sand?


High pressure, supplied-air respirators used for abrasive blasting normally have an Assigned Protection Factor of 25. What does this NIOSH rating mean?


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.


Why is it necessary to remove grease from a metallic surface before you clean it by abrasive blasting?


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


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.


In general, which of the following coating types or conditions is easiest to remove by blast cleaning?


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


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?


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


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


True or false: An abrasive metering valve should feed abrasive at 90 degrees into the air stream of an abrasive blasting system.


Embedment of abrasive grit is a problem often encountered in surface preparation of stainless steel.


Where would you expect to find an air wash separator?


What is one main purpose of a deadman switch on a blasting system?

(Question submitted by KVG, a PaintSquare News subscriber)


Burnishing, polishing, and abrasive blasting are examples of what?


Which of the following parameters affects the depth of the surface profile when steel is cleaned by abrasive blasting?


Which of the following is an advantage of using steel shot rather than steel grit in a blasting system?


 
 
   

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Clemco Industries Corp.
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Mounts inside blast helmet, alerts operator to dangerous breathing-air condition by audible, visual, and vibratory alarms. Easily calibrated, battery operated.


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
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Vacuum and dust collector hose, filters and related accessories.
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Trelawny Surface Preparation Technology
Surface Preparation Equipment

Manufacturer of needle scalers, grinders, scarifiers and scabblers. Pneumatic tools for Marine and Construction. US distributor CS Unitec: 800-700-5919


Dow Polyurethane Systems
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Dow’s high-performance, protective polyurethane spray elastomer system increases durability for steel and concrete applications.


Elcometer, Inc.
Elcometer 266
DC Holiday Detector

Easily Finds Pinholes, Flaws & Thin Spots; Safer, More Reliable Testing; Voltage-Adjustable Keypad; Dual-Safety Switch On Handle.

 
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