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NEW QUESTION # 61
What characteristic shall be required for form selection?
Answer: C
Explanation:
According to API TR 980, a form must be able to support its own weight and the pressure from the refractory material:
"Formwork shall be self-supporting and capable of withstanding the static and dynamic loads imposed during installation."
- API TR 980, Section 4.2.1, Form Requirements
Transparency and chemical resistance are not required characteristics for refractory formwork in installation.
NEW QUESTION # 62
A separation between adjoining parts of a refractory lining that allows small expansive movements, such as those caused by thermal change is known as
Answer: D
NEW QUESTION # 63
During gunning, inclusion of rebound is minimized by which of the following techniques?
Answer: C
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 # 64
A combination of refractory grain and suitable bonding agent that, after the addition of a proper liquid, is generally poured into place to form a refractory shape or structure which becomes rigid because of chemical action is called
Answer: A
NEW QUESTION # 65
When water is used for refractory installed on a carbon steel surface with a stainless steel anchorage, the chloride content of the potable water shall not exceed:
Answer: D
Explanation:
According to API Standard 936, water used in the preparation of refractory mixes is subject to quality limitations, especially when stainless steel anchors are embedded in or come into contact with the refractory that is installed on a carbon steel surface. High chloride concentrations in the mixing water may promote corrosion in stainless steel anchoring systems.
API 936 explicitly states:
"When water is used for refractory installed on a carbon steel surface with a stainless steel anchorage, the chloride content of the potable water shall not exceed 50 ppm."
- API Std 936, Section 5.1.2
This clause is intended to protect the integrity of stainless steel anchors from chloride-induced stress corrosion cracking or pitting, which can compromise the mechanical support of the refractory lining.
Therefore, Option A (50 ppm) is the only correct and code-compliant answer.
NEW QUESTION # 66
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