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API-936 Certification Exam is conducted by the American Petroleum Institute (API), a leading trade association that represents the oil and gas industry. The API-936 certification program is based on the API Recommended Practice 936, Refractory Installation Quality Control Guidelines, which provides guidelines for the installation quality control of refractory materials. API-936 exam is designed to ensure that certified professionals have a comprehensive understanding of the guidelines and can effectively implement them in their work.
To be eligible to take the API-936 exam, candidates must have a minimum of three years of experience in the refractory field, with at least one year of experience in inspection and testing. Candidates must also have a high school diploma or equivalent education. The API-936 exam is administered at authorized testing centers around the world.
NEW QUESTION # 10
Refractories whose major constituent is lime, magnesia, or both and which may react chemically with acid refractories, acid slags, or acid fluxes at a high temperature is known as
- A. Basic refractories
- B. Natural refractories
- C. Acid refractories
- D. None f the above
Answer: A
NEW QUESTION # 11
Applicator qualification for thin layer erosion resistant lining, each applicator shall pack a test panel of size.
- A. None of the above
- B. 450 x 450 x 50 mm
- C. 500 x 500 x 25mm
- D. 12" x 12" x ¾ or 1" (300 x 300 x 20 or 25mm)
Answer: D
NEW QUESTION # 12
For non-erosive service, what is the required number of test specimens per sample for cold crushing strength?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
According to API Std 936, cold crushing strength tests for non-erosive service require:
"For non-erosive service, a minimum of two specimens per sample shall be tested for cold crushing strength."
- API Std 936, Section 6.4.2, Cold Crushing Strength
This ensures adequate verification of mechanical integrity without the more stringent criteria used for erosive applications. Therefore, Option B is correct.
NEW QUESTION # 13
Section of transfer line in which flow is in an upward direction is called
- A. None of the above
- B. Plenum of FCCU
- C. Cyclone of FCCU
- D. Riser of FCCU
Answer: D
NEW QUESTION # 14
An alternative to wire mesh baskets is a panel with enclosed sides when the:
- A. samples are cut with an abrasive medium
- B. samples are cut from the edge of the panels
- C. dimensions are greater than 18 in. (450 mm) * 18 in. (450 mm) * 4 in. (100 mm)
- D. dimensions are less than 18 in. (450 mm) * 18 in. (450 mm) * 4 in. (100 mm)
Answer: C
Explanation:
API 936 allows for the use oftest panels with enclosed sidesinstead of mesh basketswhen the dimensions exceed 18 in. x 18 in. x 4 in.This substitution provides adequate confinement and stability for larger samples during casting and curing, helping maintain uniformity and representative test integrity.
Wire mesh baskets are typically preferred for smaller, lighter samples, but for larger mock-ups or when vibration is involved, fully enclosed forms prevent edge erosion and deformation during casting and handling.
Reference:
API Std 936, Section 7.3.1.1 - "For samples greater than 18 in. × 18 in. × 4 in. (450 mm × 450 mm × 100 mm), solid-sided molds may be used instead of wire mesh baskets."
NEW QUESTION # 15
Who is responsible to provide details of metal fiber reinforcement including dimensions, concentration, type and metallurgy?
- A. Manufacturer
- B. Inspector
- C. Owner
- D. Contractor
Answer: A
Explanation:
The manufactureris responsible for specifying the exactdimensions, type, concentration, and metallurgical propertiesof metal fiber reinforcement in castable refractories. These fibers are often integral to the formulation and performance of the material and are introduced during manufacturing (not field mixing), with characteristics tailored to improve thermal shock resistance and crack propagation control.
API 936 defers to the manufacturer's technical data for the design and quality control of any material component, including reinforcement. The contractor is responsible for verifying that materials match the manufacturer's documented specification.
Reference:
API Std 936, Section on "Material Submittals" and "Manufacturer's Technical Datasheets" API TR 978, Section on "Metallic Reinforcement in Monolithics" indicates that fiber specs are a manufacturer responsibility
NEW QUESTION # 16
Additives used to facilitate moisture removal of refractory linings during dry out are called
- A. None of the above
- B. Organic fiber
- C. Metal fiber
- D. Mineral fiber
Answer: B
NEW QUESTION # 17
What is the ASTM test designation for cold crush strength?
- A. C-704
- B. C-417
- C. C-113
- D. C-133
Answer: D
Explanation:
The correct ASTM designation for testingcold crushing strength (CCS)of refractory materials isASTM C133.
This test determines the load at which a sample fails under compressive stress and is essential for assessing the structural integrity of castable and formed refractories.
ASTM C113 relates to permanent linear change.
ASTM C704 is for abrasion resistance.
ASTM C417 is not related to CCS in this context.
Reference:
API Std 936 references ASTM C133 as the governing method for determining cold crushing strength of refractory samples.
Also validated in API TR 978 -Monolithic Refractories: Properties and Selection
NEW QUESTION # 18
Which of the following is a valid acceptance criterion for cold crushing strength of castable used in erosive service?
- A. All individual values must exceed 75% of the manufacturer's minimum published CCS.
- B. The lowest result must exceed 90% of ASTM C401 average for gunned materials.
- C. CCS test values must average within ±10% of the manufacturer's mean value.
- D. CCS must be no less than 80% of the manufacturer's advertised maximum.
Answer: A
Explanation:
API Std 936 defines the acceptance criteria for CCS under erosive service in Section 6.4.2:
"Test values for cold crushing strength shall meet or exceed 75% of the manufacturer's minimum published value for each individual specimen."
- API Std 936, Section 6.4.2
This criterion ensures that all tested samples meet a critical durability threshold before field acceptance.
NEW QUESTION # 19
When is metal fiber reinforcement used in castable refractory?
- A. For all monolithic hot face castable refractory materials
- B. Only when extra strength is required
- C. Only when added in the field
- D. Only when specified by the owner
Answer: D
Explanation:
Metal fiber reinforcement isnot a universal requirementfor all castables; it isused only when explicitly specifiedby theowneror design engineer based on the thermal and mechanical service conditions. Fibers are typically added to enhance resistance to thermal shock, spalling, or dynamic loads, particularly in cyclic or erosive environments like FCCU risers.
API 936 requires adherence to project specifications, and unless the use of fiber reinforcement isclearly indicated in the job specifications, it is not assumed or automatically added.
Reference:
API Std 936, Clause on Material Design and Job Specifications: "Metal fiber reinforced castables shall be used only where required by the job specifications." API TR 980, "Use of Fiber-Reinforced Castables," states: "Fiber reinforcement is not intrinsic to all castables and shall be used only when required by design."
NEW QUESTION # 20
Forms (types) of refractory
- A. All above
- B. Refractory (ceramic) fibers
- C. Unshaped
- D. Shaped
Answer: A
NEW QUESTION # 21
A metallic anchor used to attach ceramic anchors to the casing or shall of a processing unit is
- A. None of the above
- B. Claw anchor
- C. U - anchor
- D. C-clip
Answer: D
NEW QUESTION # 22
As per API recommended practice 936, the standard test method for reheat change of refractory brick is
- A. C113 - 02
- B. None of the above
- C. C 181 - 91
- D. C 133 - 97
Answer: A
NEW QUESTION # 23
Size distribution of aggregate particles is determined by:
- A. rebound.
- B. porosity.
- C. expansion allowance.
- D. screen analysis.
Answer: D
Explanation:
The correct method for determining the size distribution of aggregate particles used in refractory castables isscreen analysis. This is a standardized technique for analyzing particle size distribution by passing material through a series of sieves with progressively smaller openings.
As specified in API 936 and related technical literature such as API TR 978 and API TR 980, aggregate grading and size distribution directly affect the packing density and therefore the performance of monolithic refractories. The screen analysis is fundamental in determining if aggregates fall within the prescribed grading ranges, which is critical for workability, density, and mechanical strength.
Reference:API TR 978 -Monolithic Refractories: Manufacture, Properties, and Selection, Section on
"Aggregate Grading"API Std 936 (Installation Quality Control of Monolithic Refractories) - ASTM C136
/C136M referenced in material property section.
NEW QUESTION # 24
Which of the following does not apply to cold crushing strength (CCS)?
- A. The loading head of the testing machine shall have a spherical bearing block
- B. Testing shall be in accordance with ASTM C1113
- C. CCS shall be determined on samples that have been fired to 1500°F (815°C)
- D. Density of sample affects testing loading rate
Answer: B
Explanation:
Cold crushing strength testing must conform to ASTM C133, not C1113. ASTM C1113 applies to thermal conductivity measurements using hot-wire techniques, not compressive strength.
"CCS shall be determined in accordance with ASTM C133. The loading surface of the test machine shall be a steel bearing block with a spherical bearing surface."
- API Std 936, Section 6.4.2
Thus:
A is correct (density can affect rate of loading).
B is incorrect, making it the correct answer.
C and D are correct per standard testing procedures.
NEW QUESTION # 25
The exposure of a material or body to a rapid change in temperature which may have a deleterious effect
- A. Thermal shock
- B. None of the above
- C. Thermal expansion
- D. Thermal conductivity
Answer: A
NEW QUESTION # 26
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API 936 certification exam covers a wide range of topics related to refractory materials, including their properties, installation techniques, testing methods, and maintenance procedures. API-936 exam also includes questions related to industry standards and regulations, safety practices, and environmental considerations. Refractory Personnel certification is valid for three years, after which the certified personnel must undergo a recertification process to maintain their credentials. The API 936 certification is highly valued by employers as it demonstrates the proficiency and expertise of the certified professionals in the field of refractory materials.
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