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.
