API ICP Programs API-936 Question # 23 Topic 3 Discussion

According to API Standard 936, the correct specimen dimensions for cold crush strength testing are:

“Test specimens for cold crushing strength shall be2 in. (50 mm) cubesamples prepared in accordance with ASTM C133.”

—API Std 936, Section 6.4.2​

This directly invalidates option A, which incorrectly states the specimen size as 4-1/2 inches.

For the other options:

Option B – Density determination:

API 936 states that density shall be measured using the same specimens used for linear change and abrasion resistance:

“Bulk density shall be determined using the same specimens prepared for the linear change and abrasion resistance tests.”

—API Std 936, Section 6.4.3​

“These specimens include cubes, linear change bars, and erosion plates.”

—Appendix A, API Std 936​

Option C – Abrasion resistance specimen size:

“Two 4-1/2 in. × 4-1/2 in. × 1 in. (114 mm × 114 mm × 25 mm) specimens shall be prepared for abrasion resistance testing.”

—API Std 936, Section 6.4.4​

Option D – Permanent linear change specimen size:

“Permanent linear change (PLC) is determined with a bar 2 in. × 2 in. × 9 in. (50 mm × 50 mm × 230 mm) cast in steel molds.”

—API Std 936, Section 6.4.1​

Therefore, Option A is the only false statement.