CertsOut API-API-936

API API-936

API 936 - Refractory Personnel Version: Demo [ Total Questions: 10]

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API - API-936

Category Breakdown Category Number of Questions Installation Procedures 4 Terms, Definitions, and Abbreviations 3 Material Requirements 2 Inspection and Testing Requirements 1 TOTAL 10 Question #:1 - [Installation Procedures] The mock-up for vibration cast installations demonstrates the adequacy of the: (This may have more than one correct answer; please select all that apply.)

A. craftsman's ability to construct the forms.

B. equipment.

C. means of vibrator attachment.

D. vibration method.

Answer: B C D

Explanation According toAPI TR 980, Section 4.4.2, mock-ups are required prior to actual installation for vibration-cast materials to verify theadequacy of equipment, the method of vibration, and vibrator attachment. These mock-ups are not intended to assess the craft skill in form construction.

"Mock-up vibration-casting trials are used to demonstrate the adequacy of the equipment, the means of vibrator attachment, and the method of vibration for the particular installation geometry and refractory type."

—TR 980, Section 4.4.2 Therefore: B (equipment)is correct.

C (means of vibrator attachment)is correct.

D (vibration method)is correct.

A (craftsman’s ability to construct the forms)is not the intent of this mock-up and thus not correct.

Question #:2 - [Installation Procedures] A pigment shall be used in the curing compound in order to: A. Pass with Valid Exam Questions Pool

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A. prevent ultraviolet light damage.

B. help the lining retain moisture.

C. help the lining retain heat.

D. indicate full coverage.

Answer: D

Explanation Pigment in curing compounds serves a visual function to verify that the applied coating has achieved full and even coverage across the refractory surface. This aids inspectors in confirming compliance with curing requirements.

Reference:API Std 936, Section 6.3.2 – Curing Requirements: "A pigment shall be included in the curing compound to provide visual confirmation of coverage during application."

Question #:3 - [Terms, Definitions, and Abbreviations] A layer coat of refractory lining that is applied to an existing lining in an attempt to extend the lining's life is known as: A. buttercoat B. overlay C. paint D. overspray Answer: B

Explanation The term “overlay” is defined in refractory terminology as: “Overlay: A layer of refractory material applied over an existing lining, generally to extend service life or repair localized damage.”

— API TR 980, Section 2, Definitions The other terms do not carry this specific meaning in the context of refractory maintenance.

Question #:4 - [Installation Procedures] If application of hydraulic bonded or chemical setting refractory is interrupted, the refractory lining shall be: A. Pass with Valid Exam Questions Pool

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A. cut back within 1 hour.

B. cut back within 30 minutes.

C. immediately cut back to the shell between anchors.

D. cut back to the shell in a straight line.

Answer: C

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.”

Question #:5 - [Installation Procedures] Initial heating of newly installed refractory linings shall be performed with: (This may have more than one correct answer; please select all answers that apply.)

A. electrical heating elements.

B. open torches.

C. portable burners.

D. process heating devices.

Answer: A C D

Explanation According to TR 980, direct open flame torches are not recommended for dryout because of their uneven heating and local overheating risk: “Initial heating may be performed using portable burners, electrical heating elements, or process heating devices. Use of open torches is not recommended due to potential for localized overheating and damage.”

— API TR 980, Section 5.3.3 Therefore:

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A (electrical heating elements): Acceptable B (open torches): Not acceptable C (portable burners): Acceptable D (process heating devices): Acceptable =========== Question #:6 - [Material Requirements] Which of the following does not apply to cold crushing strength (CCS)?

A. Density of sample affects testing loading rate 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. The loading head of the testing machine shall have a spherical bearing block 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. =========== Question #:7 - [Terms, Definitions, and Abbreviations] Which term is used to describe a newly installed monolithic refractory lining that has not been exposed to either a dry-out or initial heating?

A. Castable refractory B. Pass with Valid Exam Questions Pool

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B. Green refractory C. Wet refractory D. Installed refractory Answer: B

Explanation The API 936 terminology section defines "green refractory" as: “Green Refractory: A monolithic refractory that has been placed but has not yet been exposed to curing or dryout temperatures.”

— API Std 936, Section 3: Definitions Thus, “green refractory” is the technically correct term for the unheated, freshly installed condition. =========== Question #:8 - [Terms, Definitions, and Abbreviations] Materials that are easily reduced to a granular or powdery condition after placement are known as: A. friable materials.

B. calcined frits.

C. mineral additives.

D. granular grog.

Answer: A

Explanation PerAPI Std 936, friable materials are defined as: “Friable: A term applied to a material that is easily reduced to a powdery or granular state by crushing or rubbing.”

—API Std 936, Section 3: Definitions This is a key property considered in refractory evaluation because friability can indicate material weakness after installation.

Therefore: A (friable materials)is the correct and technically defined term.

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The other terms refer to distinct classes of materials not defined this way.

Question #:9 - [Inspection and Testing Requirements] For erosion service, density results are determined from which of the following specimens?

A. Crushing cubes and linear change bars B. Abrasion plates only C. Crushing cubes only D. Abrasion plates and linear change bars Answer: D

Explanation For linings intended for erosive service, API 936 requires testing that includes specimens that experience real service wear simulation: “For erosive service, bulk density shall be determined using the abrasion resistance test specimens and the linear change specimens.”

— API Std 936, Section 6.4.3 Thus, both abrasion plates and linear change bars are used to evaluate density in erosion-sensitive applications.

Question #:10 - [Material Requirements] The best definition for creep is: A. deformation due to continuous load over time.

B. an increase in expansion at high temperatures.

C. shrinkage at high temperatures.

D. cracking caused by thermal shock.

Answer: A

Explanation Creepin refractories is the slow, time-dependentdeformation of a material under constant stressand high temperature. It is critical in applications like reformers and furnaces where the refractory is under load for extended periods. The amount of deformation is typically measured over 50–100 hours in standardized tests such as ASTM C832.

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Creep is not the same as thermal expansion (which is reversible), or cracking (a sudden failure).

Reference: API TR 981 –Thermal Expansion Under Load and Creep of Refractories, defines creep as deformation due to a sustained load over time under high temperatures

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