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NEW QUESTION # 70
During gunning, inclusion of rebound is minimized by which of the following techniques?
Answer: A
Explanation:
To minimize rebound during gunning, API TR 980 clearly instructs to:
"Begin at the lowest level of the installation and build up gradually to full thickness in a small area of approximately 10 ft² (1 m²), avoiding sweeping motions."
- API TR 980, Section 4.3.4
This method prevents rebound contamination and cold joints that could occur if a larger area is covered too quickly or in an uncontrolled pattern.
Therefore, Option C is correct, and Options A, B, and D are incorrect according to best practices outlined in API TR 980.
NEW QUESTION # 71
Cold wall refractory lined components shall be dried out by heating from:
Answer: B
Explanation:
Cold wall refractory systems are typically backed by steel shells, which are poor at withstanding the thermal stresses that come from reverse heating. API 936 and API TR 980 clearly emphasize thatthe heat-up or dryout process for cold-wall linings must always begin from the hot face- that is, the process-exposed surface.
Heating from thehot faceallows for controlled migration of moisture toward the cold face and eventual venting to the atmosphere. Conversely, heating from the cold face or steel shell side traps moisture between the hot impermeable material and the outer surface, leading to:
Steam buildup
Explosive spalling
Cracks in the material or at the interface with the steel
For these reasons,only the hot facemethod is specified unless the design and dryout plan justify a different method under special engineering review.
Reference:
API Std 936, Section 6.5.2: "Dryout shall be performed from the hot face only unless otherwise specified." API TR 980, Section on "Dryout of Cold Wall Systems": Highlights the mechanisms of vapor movement and the risks of reverse heating.
ASTM C1190(Referenced Method): Supports the use of correct drying schedules and methods.
NEW QUESTION # 72
Which of the following steps are required to apply to thin-layer erosion-resistant linings?
(This may have more than one correct answer; please select all answers that apply.)
Answer: A,B,C
Explanation:
According to API TR 980, specific practices are required during the installation of erosion-resistant refractory linings:
"Thin-layer linings shall be installed so that overfill is trimmed flush to the hexmetal..."
"Mixing procedures, including mix times and water ratios, shall be defined during material qualification testing..."
"The refractory shall be fully compacted in and around the anchor supports."
- API TR 980, Section 4.3.2
Additionally, slicking (Option A) is not permitted as it interferes with mechanical bond development.
NEW QUESTION # 73
Throughout a period of at least 24 hours, test specimens for air-setting, phosphate-bonded castable refractories are:
Answer: D
Explanation:
Air-setting, phosphate-bonded castables rely on a chemical bonding mechanism that activates when exposed to ambient moisture and carbon dioxide. API 936 outlines that these materials should becured in ambient air without being covered, as covering can trap moisture and inhibit the proper development of the chemical bond. Covering or artificially heating during this early curing stage may lead to defects such as cracking or uneven setting.
Theminimum 24-hour air curingperiod ensures sufficient evaporation of excess water and the development of mechanical integrity before any handling, heat exposure, or further processing. Covering these castables may interfere with the air-bonding mechanism and is not recommended.
Reference:
API Std 936, Section 6.3.1: "Air-setting phosphate-bonded refractories shall be air cured, uncovered for at least 24 h." API TR 980, Section on Air-Setting Castables: Emphasizes the importance of allowing unrestricted air exposure during initial set.
NEW QUESTION # 74
Which party or individual is responsible for submitting a dryout procedure for a new lining?
Answer: A
Explanation:
According to API 936, thecontractoris responsible for submitting adetailed dryout procedure. This procedure must be reviewed and approved by the owner or the owner's representative. While manufacturers may provide guidance, the contractor is accountable for ensuring the procedure aligns with project specifications, material requirements, and environmental conditions.
Reference:
API Std 936, Section 6.5.1 - "The contractor shall submit a proposed dryout procedure... for review and approval."
NEW QUESTION # 75
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