Pass Guaranteed Quiz API - API-936 - Refractory Personnel High Hit-Rate Test Guide
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API Refractory Personnel Sample Questions (Q83-Q88):
NEW QUESTION # 83
What is the size of a test specimen for permanent linear change of refractories?
- A. 2 in. (50 mm) x 2-1/2 in. (64 mm) x 9 in. (230 mm)
- B. 2-1/2 in. (64 mm) x 2-1/2 in. (64 mm) x 2 in. (50 mm)
- C. 2 in. (50 mm) x 2 in. (50 mm) x 9 in. (230 mm)
- D. 2 in. (50 mm) x 2 in. (50 mm) x 4 in.(100 mm)
Answer: C
Explanation:
The standard specimen size for conducting tests on Permanent Linear Change (PLC) of refractories is2 in. x 2 in. x 9 in. (50 mm x 50 mm x 230 mm). This dimension is consistent with ASTM C113, which is referenced in API 936 for evaluating the dimensional stability of refractory materials after heat treatment.
Permanent Linear Change testing is essential to determine the expansion or shrinkage behavior of refractories when exposed to high temperatures, a critical property for ensuring dimensional compatibility in service.
Reference:API Std 936 - Clause on Inspection and Testing RequirementsReferenced Standard: ASTM C113 (Standard Test Method for Reheat Change of Refractory Brick)
NEW QUESTION # 84
If application of hydraulic bonded or chemical setting refractory is interrupted, the refractory lining shall be:
- A. cut back within 1 hour.
- B. cut back within 30 minutes.
- C. cut back to the shell in a straight line.
- D. immediately cut back to the shell between anchors.
Answer: D
Explanation:
When installation is interrupted, the partially installed refractory must becut back to the shell between anchorswhile it is still workable. This ensures a clean, rough bonding surface free from weak or partially set material. API 936 requires this method for bothhydraulic bondedandchemically bondedsystems to preserve lining integrity and avoid delamination between old and new material.
Reference:
API Std 936, Section 6.2.3 - "When work is interrupted, material shall be cut back to the shell between anchors while still plastic."
NEW QUESTION # 85
Packing of chemical setting refractories should have mechanical protection by
- A. Rigid plastic
- B. Cardboard
- C. Metal outside
- D. Any of the above.
Answer: D
NEW QUESTION # 86
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:
- A. 200 ppm
- B. 50 ppm
- C. 250 ppm
- D. 100 ppm
Answer: B
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 # 87
A separation between adjoining parts of a refractory lining that allows small expansive movements, such as those caused by thermal change is known as
- A. Thermal conductivity
- B. Thermal expansion
- C. Expansion joint
- D. None of the above
Answer: C
NEW QUESTION # 88
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