Question 1

Single lift, twin lift or tandem lift?

Accepted Answer

A single-lift spreader handles one container. A suitable twin-lift arrangement can lift a pair of 20-foot containers; tandem systems are a different multi-container arrangement. Confirm the container mix, combined weights, load distribution, spreader design and handling procedure. Two trolleys do not automatically mean two containers per lift.

Question 2

Cabin operation, remote control or automation?

Accepted Answer

Choose which movements remain operator-controlled and which are automated. Remote operation needs an effective camera view and feedback; automated transfer also needs positioning, protection and coordination with terminal vehicles and systems. Define how exceptions and recovery are handled rather than treating all three options as equivalent.

Question 3

Which functions should be reviewed with the equipment proposal?

Accepted Answer

Review container engagement and release indications, load protection, spreader positioning and the applicable collision-protection functions. Agree working and parked wind conditions, storm restraint, access and recovery arrangements for the selected crane and berth.

Question 4

What makes a useful acceptance test?

Accepted Answer

Define the test loads, vessel and landside positions, operating mode and required handoff sequence. Verify the agreed crane functions and terminal interfaces, including interruption and recovery. Assess any productivity target against stated operating conditions and vehicle availability, not hoist speed alone.

Question 5

Is an STS crane the same as a container yard crane?

Accepted Answer

No. An STS crane transfers containers across the ship-to-shore interface at the berth. RTG and RMG yard cranes stack or transfer containers in the yard. Their operating envelopes and civil interfaces are different.

Question 6

Can a larger crane be added to an existing quay?

Accepted Answer

Only after checking the existing structure and layout against the proposed crane loads and dimensions. Rail spacing, wheel loads, power, clearances and storm restraint all need review. A suitable outreach does not establish that the berth can support the crane.

Question 7

Does higher lifting speed guarantee more container moves per hour?

Accepted Answer

No. Actual output also depends on vessel stowage, trolley travel, positioning, twistlock work, vehicle readiness and interruptions. Compare performance using the same defined working cycle and terminal conditions.

Decision	Single-trolley transfer	Dual-trolley transfer
Container route	One trolley and hoisting system move the container between the vessel and the landside handoff position.	A main trolley serves the vessel; a second trolley handles the landside transfer through an intermediate handoff area.
Operating implication	Ship-side and vehicle-side handling share the same transfer cycle. Vehicle readiness affects the return to the ship.	Ship-side and landside cycles can overlap. The transfer area, vehicle coordination and additional machinery need to be included in the design.

Vessels and cargo	Target ships, container sizes and weights, deck and hold profiles, fender offsets and operating water levels. State any planned future vessel envelope.
Quay and services	Rail arrangement and allowable loads, travel limits, power connection, storm parking and site environmental conditions. Identify who verifies the quay structure.
Terminal operation	Receiving vehicles, handoff lanes, twistlock handling, operating hours and required cycle scenarios. Identify terminal-system interfaces and operator responsibilities.
Delivery and support	Transport and erection route, site lifting access, commissioning responsibilities, operator training, service access, documentation and initial spare parts.