CHEMCO Exit Exam • Set 1 Question 3 of 30
What test is performed on tank bulkhead surfaces to detect microscopic hydrocarbon residues before loading sensitive chemical cargoes?
✓
Direct Answer
Option D: Wall Wash Test (WWT)
Wall Wash Testing uses solvents (methanol/acetone) to check tank cleanliness parameters such as Permanganate Time, Purity, and Chloride content.
All Options
A
Hydrostatic pressure test
B
Magnetic particle test
C
Ultrasonic thickness test
D
Wall Wash Test (WWT)
(Correct Answer)
Detailed Explanation & Context
Wall Wash Testing uses solvents (methanol/acetone) to check tank cleanliness parameters such as Permanganate Time, Purity, and Chloride content.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
Advertisement
Practice Full CHEMCO Set 1
Test yourself with 30 interactive questions, live timer, and instant score.