NACE CIP EXAM Practice Questions With Answers | Latest Updated 2023/2024 Graded A+ | 100% Verified

Vulcanization is a physicochemical (physical and chemical) change resulting from the cross linking of the unsaturated hydrocarbon chain of natural rubber (polyisoprene) with sulfur, and the application of heat. Three factors that affect the properties of the vulcanizate (vulcanized product) - answerPercentage of sulphur and accelerator used Temperature of the curing process Time of cure Methods used to cure (vulcanize) rubber are - answerAutoclave (vulcanizer) cure Internal steam cure Atmospheric steam cure (also called exhaust steam cure) Hot water cure Chemical cure The three categories of natural rubber are - answerSoft, semi hard, hard What is a tri-ply lining - answerLining construction used to form a sandwich which is semi-hard, or hard, rubber between two layers of soft rubber Some various types of synthetic rubber are - answerButyl rubber Neoprene rubber Nitrile rubber Chlorobutyl rubber Hypalon types Typical surface preparation requirements (rubbers) - answer1. Steel shall be new, full weight steel, free from structural defects 2. Steel plate shall be flat with no appreciable warp or buckle 3. Steel plate should have a minimum thickness and weight specified 4. Vessel must be braced to avoid bulging 5. All welds to be continuous, peened, and ground to remove sharp edges and high spots. 6. Edges and corners should be ground to a minimum radius as specified 7. All weld spatter should be removed 8. Blast cleaned to NACE 1 with surface profile of 1.5-2.5 mils Some of the causes of failure with rubber linings may be - answerIncorrect product selected for the intended service Using rubber after the shelf life has expired Using rubber lining that wasn't stored properly. Rubber must be kept in cool storage because with heat it can vulcanize on the roll. Incorrect application process Inadequate cure Three methods for applying polyethylene are - answerMelting the resin and extruding it onto the surface of the article Heating the work piece and then immersing it into a fluidized bed Flame spraying The standards engineering society (SES) describes a standard as - answerA document that applies collectively to codes, specifications, recommended practices, classifications, test methods, and guides, which have been prepared by a standards developing organization or group, and published in accordance with established procedures. Voluntary standards - answerAre standards established generally by private sector bodies that are available for use by any person or organization, private or government. Mandatory standards - answerStandard that requires compliance because of a government statute or regulation, an organization internal policy, or contractual requirement. Explain the difference between NSB and SDO - answerNational standards body- used to refer to the one per country standardization organization which is that country's membership to Internal Organization for Standardization (ISO) Standards Developing Organization- refers to the thousands of industry or sector based standards organization that develop and publish industry specific standards Name and define the three NACE standards classification - answerStandard Practice (SP) Test Method (TM) Material Requirement (MR) Some of the properties of concrete are - answerExtremely durable Inorganic Hard Has good compressive strength Improves with age How does concrete cure - answerHydration Poured concretes can be affected by - answerAmbient conditions- hot weather causes concrete to cure more rapidly than otherwise, resulting in a greater possibility of voids, and a dusty, low strength surface. Applying a curing compound can help mitigate the affects of these conditions. Many entities require a wet burlap curing blanket to be used over freshly placed concrete to prevent this type of "drying out" Vibration- This is done to remove air pockets, and can cause the heavy aggregate to sink to the bottom of the form. This results in a weak, sandy surface, creating a fragile layer of sand and cement known as laitance. This condition can occur both at the upper surface and at the concrete / form surface or interface Guniting - answerprocess of spraying or slinging shotcrete onto a surface as a coating to restore concrete to its original grade. Concrete may be coated for several reasons including: - answerDecoration Waterproofing Enhancing chemical resistance Protection from freeze-thaw cycles Protection from reinforcing steel Decontamination Surface sealer Protection against abrasion and erosion Color coding Protecting purity of water or other products contained Improving and simplifying cleaning Skid resistance Difference between Laitance and Efflorescence - answerLaitance- is the weak surface layer of water rich cement mixture on the surface of fresh concrete caused by the upward movement of water. Efflorescence- is caused by moisture passing through the concrete and carrying soluble concrete salts with it to the surface. The salts react with carbon dioxide in the atmosphere creating a fluffy white crystalline deposit on the surface Surface prep is generally performed on concrete by - answerAbrasive blast cleaning Hand and power tool cleaning High pressure waterjetting or blasting Acid etching Stoning Centrifugal blasting Scarifying Concrete surface prep standard - answerNACE 6 / SSPC-SP 13, Joint surface prep standard for Surface Preparation of Concrete The advantages of waterjetting and wet abrasive blasting on concrete including - answerFast cutting of the surface Washing dust away Reducing abrasive and concrete particles in the air. What is Sacking / Stoning - answerSacking- consists of scrubbing a mixture of cement mortar over the concrete surface using a cement sack, gunny sack, or a sponge rubber float. Stoning- similar to sacking, except that a carborundum brick, or other appropriate abrasive block, is used to smooth the surface of the concrete. Several generic types of coatings may be used over concrete including - answerBituminous cutbacks Chlorinated rubber Vinyl Epoxy Novalac epoxy Elstomeric polyurethane Sheet materials (rubber) Glass fiber reinforced plastics Furan resins Tests for the presence of moisture in concrete include - answerASTM D 4263, Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method ASTM F 1869, Calcium chloride test Electronic Testing: Concrete Moisture Meter Explain the procedure for ASTM 4263 - answerASTM 4263, standard test method for indicating moisture in concrete by the plastic sheet Method. A segment of 4.0 mil thick, clear polyethylene sheet approximately 18in x 18in is taped over the concrete to be tested so that the concrete is tightly sealed from the atmosphere and sunlight. The test patch is allowed to remain a minimum of 16 hours. Which organization produces a set of comparator plates for various prepared concrete surfaces - answerInternational Concrete Repair Institute (ICRI) DFT of coating on concrete can be measured by - answerEstimated from WFT Estimated from quantity of coating used Verified by a paint inspection gauge (took) Determined by a modified gauge based on ultrasound List standards that may be used for dry film measurement of coatings over concrete - answerASTM-D6132-97 standard test method for nondestructive measurement of DFT of applied organic coatings over concrete using and ultrasonic gage SSPC-PA-9 Measurement of dry coating thickness of cementitious substrates Describe the proper safe accurate operating procedure for a low voltage holiday detector - answerGround cable is attached directly to substrate Sponge saturated with a solution of tap water / wetting agent Maximum rate of 1 linear ft/s Used on coatings up to 20 mils May be used on concrete Construction materials may include, but not limited to - answerSteel Aluminum Stainless Plastic The majority of the pipes coated at a facilty or plant and shipped to site are called: - answerPlant applied Typical plant applied or mainline coatings include - answer2 layer PE 3 layer PE Fusion bonded epoxy Tapes Coal tar enamel Asphalt Insulated Concrete Polyethylene (PE) can be extruded by - answerSide extrusion for large diameter pipe Crosshead extrusion Common characteristics of FBE include - answerTypically green or red and looks like "painted finish" May be a single layer or two layer "dual powder" DFT from 10-20 mils The FBE application process includes - answerPreheating the pipe Grit or shot blast the area to Nace 2 Optional- pre treat the area with acid bath Heat the pipe to the specified temperature Apply the FBE coating Curing the FBE coating application Quench the coating in a fresh water bath