[Material Requirements] Which of the following is false per the requirements of API Standard 936?

The statement is false. According to API Standard 936, Table 1, "Qualification Test Requirements for Monolithic Refractories," the test for Cold Crushing Strength (CCS) requires two 2 in. (50 mm) cubes. The dimensions provided in the option, 4-1/2 in. × 4-1/2 in. × 4-1/2 in., are incorrect for this specific test. Furthermore, the metric conversion provided in the option is inconsistent, listing both 144 mm and 114 mm for the same 4-1/2 in. dimension, which is an additional error.

B. This is a true statement. API 936, Section 4.3.2.2, allows density to be determined using specimens prepared for permanent linear change (bars), abrasion resistance (plates), or from cubes.

C. This is a true statement. API 936, Section 4.3.2.5, explicitly specifies that abrasion resistance shall be determined using two 4-1/2 in. × 4-1/2 in. × 1 in. (114 mm × 114 mm × 25 mm) specimens.

D. This is a true statement. API 936, Section 4.3.2.4, requires that permanent linear change be determined using one 2 in. × 2 in. × 9 in. (50 mm × 50 mm × 230 mm) specimen.

1. American Petroleum Institute (API). (2014). API Standard 936: Refractory Installation Quality Control—Inspection and Testing Monolithic Refractory Linings and Materials (4th ed.).

For Correct Answer (A): Table 1

"Qualification Test Requirements for Monolithic Refractories

" page 8

specifies "Two 2 in. (50 mm) cubes" for the Cold Crushing Strength test.

For Incorrect Option (B): Section 4.3.2.2

page 7

states

"Density shall be determined...using the same specimens as used for permanent linear change (see 4.3.2.4) or abrasion resistance (see 4.3.2.5)." Table 1 also lists "Two 2 in. (50 mm) cubes" for density.

For Incorrect Option (C): Section 4.3.2.5

page 7

states

"Abrasion resistance shall be determined...using two 4 1/2 in. × 4 1/2 in. × 1 in. (114 mm × 114 mm × 25 mm) specimens..."

For Incorrect Option (D): Section 4.3.2.4

page 7

states

"Permanent linear change shall be determined...using one 2 in. × 2 in. × 9 in. (50 mm × 50 mm × 230 mm) specimen..."