NACE CP1 - (2) questions well solved 2023

NACE CP1 - (2) questions well solved 2023Cathode More noble region where electrons are consumed. Reduction occurs at the cathode Anode Part of the metal that corrodes. Oxidation occurs at the anode Return Path Connects cathode and anode and allows passage of electrons generated at the anode to the cathode Electrolyte Medium that conducts ionic (rather than electronic) current Negative Electrode Zinc case which corresponds to the anode in a corrosion cell High Voltage Detection Types 1. Rolling Spring 2. Smooth Neoprene Flaps 3. Bristle Brush Low Voltage Detectors Battery Range is: 5-120V DC General Types of Holiday Detectors 1. Low voltage DC 2. High voltage DC 3. High voltage pulsed DC 4. High voltage AC Adhesion Failures May be Caused by: 1. Contaminated surface 2. Wrong surface prep. 3. Insufficient profile 4. Exceeding topcoat window Checking can be Described as: Line cracks in the coating surface Causes of Cracking 1. Stress from movement 2. Internal stress as coating ages Common Cause of Blistering Surface contaminants: oil, moisture, and/or grease Pinholes are: Small holes in the coating Vacoules or voids are typically caused by: Air trapped in coating during mixing Cratering may be caused by: Air trapped in coating A powdery, friable layer on the surface of a coating common with epoxy coatings is: Chalking Runs, sags and wrinkles are caused by: 1. Coating applied too thickly 2. Too much thinner 3. Surface too hot 4. Improper spray technique Problems caused by amine blush 1. Surface tackiness 2. Incomplete cure 3. Poor adhesion Non drying films may be caused by: 1. Environmental issues 2. Wrong/contaminated thinner 3. Manufacturer coating issues MSDS contains following 1. Stability and reactivity 2. Handling and storage 3. PPE 4. Physical and chemical properties Coating product data sheets contain 1. Generic type 2. Description 3. Features 4. Color 5. Finish 6. Proper use 7. Performance data 8. VOC values 9. Application methods 3 ways coating is applied 1. Brush 2. Roller 3. Spray High temp concerns 1. Slow solvent evaporation 2. leaves moisture on coating surface Low temp concerns 1. Slow cure times 2. Increased viscosity Guide to enclosures SSPC Technical Update #6 Project inspection documentation provides 1. QC records 2. Management Information 3. Verification of work 4. Details of non-conformance work Good records allow management to: 1. Detect design defects 2. Evacuate coating performance 3. Develop ongoing maintenance program 4. Determine annual cost data Inspection records show: 1. Environmental conditions 2. pretreatment details 3. Cleaning details 4. Materials information 5. Coating applications 6. Tests results Documentation may include 1. Dail reports 2. Inspection logs 3. Routine reports 4. Monthly/quarterly reports People who may be required to attend 1. Owner 2. Engineer 3. Ops personnel 4. Specifier 5. Purchase agent 6. Coating manufacturer 7. Coating inspector 8. Project safety 9. Coating applicator Goals of a pre-job conference 1. HSE discussion 2. Adress/clarify emergency procedures 3. Review SOW 4. Review logistical support 5. Discuss/clarify inspector responsibilities 6. Clarify chain of command Common errors using replica tape 1. Variation in point to point profile 2. Dirt on tape/guage 3. Guage accuracy 4. Rubbing technique Standards for replica tape 1. RP-0287-95-Accuracy 2. ASTM 4417-93-Reproducibility 2 types of replica tape Coarse and extra coarse Iso comparator grades may by recorded as: 1. Finer than fine 2. Fine 3. Medium 4. Coarse 5. Coarser than coarse Depth of profile can be evaluated by: 1. Iso comparators 2. Replica tape 3. Digital profile guage Tests for soluble salts include: 1. Potassium Ferricynide 2. Bresle patch 3. Sleeve test 4. Conductivity 5. Soluble salt meters Effective inspection spec. for soluble salts should include: 1. Limits of salts acceptable 2. Specific salts limited 3. Test method 4. Frequency of testing 5. Where to administer tests 3 types of soluble salt contamination are: 1. Chlorides 2. Sulphates 3. Nitrates 3 surface profile test methods 1. Comparator and coupons 2. Replica tape 3. Profilometer NACE SSPC Waterjetting Standard NACE 5/SSPC-SP12 3 types of water blasting 1. Grit blasting w/shroud 2. Sand injected water blast 3. Slurry blast w/grit & water mix Ulta high pressure water jetting range 30K to 50K PSI High pressure water jetting range 10K to 30K PSI High pressure water cleaning range 5K-10K PSI Low pressure water cleaning range Below 5K PSI Recyclable grit types 1. Steel grit 2. Cast iron 3. Plastic beads 4. Sponge particles Abrasive media types 1. Shot grit 2. Crushed slag 3. Ceramic grit 4. Silica sand Checklist items for surface prep. 1. Ambient conditions 2. Substrate conditions 3.Pre-blast surface cleanliness 4. Shot/grit size 5. Shot/grit cleanliness 6. Surface profile 7. Operator qualification Describe low voltage holiday detectors Sensitive electronic devices powered by batteries ranging from 5-120V DC 4 Typical SSPC-SP1 pre-cleaning methods 1. Solvent spray 2. Steam cleaning 3. Emulsion cleaning 4. Alkaline cleaners Common fabrication defects 1. Laminations 2. Gouges 3. Rough welds 4. Corners Common design defects 1. Inaccessible areas 2. Welds 3. Gaps 4. Dissimilar metals 5. Overlapping surfaces Factors that may affect surface prep. 1. Residues-oils, grease, soil 2. Chemical salts residue 3. Rust on surface 4. Mill scale 5. Anchor pattern issues Surface prep should be inspected a minimum of what 3 times? 1. Before surface prep. 2. After prep, before coating 3. Between coating applications (multiple coats) Inspectors responsibilities as they relate to spec. Observe and report all technical aspects of a coating project 5 Formal specification sections 1. Scope of work 2. Terms and Definitions 3. Reference standards and codes 4. Safety 5. Surface preparation Oil based coatings applied over alkaline surfaces may result in: Saponification: High Ph forms a soap like material which reacts between the two coatings Industrial and marine coatings are commonly referred to by: Generic resin type Main ingredients for hydration coating to cure Same level of humidity as surrounding