Question 1

RISQ Q8.8 sets out specific sequencing requirements for ballast holds used to carry cargo: blanks/cover plates on bilge suctions, CO2 smothering lines, and hatch coaming drains must be removed before the hold carries cargo, then re-sealed before ballasting, with hold vents opened during de-ballasting. Why does the sequence matter so much, rather than just "ensure everything is correctly configured" at some point?

Accepted Answer

The hold's configuration must change between its two functions (cargo space vs ballast tank), and doing the steps in the wrong order can leave a ballast suction route open during cargo carriage (risking accidental flooding) or leave cargo-mode blanks in place during ballasting (blocking the CO2 system or bilge drainage when needed) — the sequence exists because the same physical space cannot be safely configured for both functions simultaneously A "combination" ballast hold is genuinely two different configurations depending on whether it currently holds cargo or ballast water, and the blanks/cover plates are what physically separate those two states. Doing the conversion steps out of order — for example, ballasting before removing cargo-mode blanks from the suctions — can leave critical systems (CO2 smothering, bilge drainage) non-functional exactly when they might be needed.

Question 2

RISQ Q8.2-8.3 (Solid Bulk Cargo) requires the IMSBC Code's Group A/B/C cargo classification, and a signed certificate of moisture content, Transportable Moisture Limit (TML), and density before loading any cargo that may liquefy. Why is the comparison between actual moisture content and TML the single most safety-critical figure in this whole certificate?

Accepted Answer

A Group A cargo loaded with moisture content above its TML can liquefy under the ship's motion at sea — the cargo effectively becomes a fluid that can shift suddenly to one side, and this shift has caused real bulk carrier capsizes; everything else on the certificate (density, general description) supports planning, but moisture-vs-TML is the line between safe and potentially fatal Liquefaction is a well-documented cause of real bulk carrier losses with crew fatalities — a cargo that looks dry and granular at loading can still contain enough trapped moisture to liquefy once compacted by the ship's motion. This is exactly why RISQ treats the TML certificate as a hard gate (cargo must not be accepted if actual moisture exceeds TML), not as routine paperwork.

Question 3

RISQ's guidance describes the "can test" — half-filling a small container with cargo sample, striking it sharply on a hard surface 25 times, and checking for free moisture — as a method the Master can use at the dockside. What is the correct interpretation of a "dry" result from this test?

Accepted Answer

A dry-appearing result is a useful indicator but does NOT prove the moisture content is below the TML — RISQ's own guidance explicitly warns that material can still exceed the TML even if it remains dry-looking after the can test, so a clear can test is not a substitute for proper laboratory moisture testing This is a deliberately-included trap in the inspection guidance itself: the can test is a useful field check available to anyone onboard, but its limitation is explicit and important — passing it does not guarantee the cargo is actually below TML. Treating a dry can test as definitive proof of safety, rather than as one input alongside the shipper's certificate, is exactly the kind of overconfidence that has contributed to real liquefaction incidents.