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Reaching out one more row

RAM Spreaders recently had a customer retrofit its Tandem system to extend the outreach of a 23-row boom to 24 rows without requiring a boom extension.

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Reaching out one more row

RAM Spreaders Tandem spreader system uses its SingFlex headblock to enable twin 40ft container operations with a single hoist crane. The system is in use at 15 ports today to increase productivity while reducing energy consumption.


A recent request from a customer in the Middle East, RAM Spreaders said, has highlighted an “unintended consequence of tandem” that RAM never thought of previously – the ability use the SingFlex headblock to reach out further over a vessel. Hub ports are now having to deal with vessels with a capacity up to 23,000 TEU that stow containers 24-rows wide and up to 12-high on deck.


“Many ports don’t have the type of cranes to reach high or wide enough and need a solution. RAM’s customer in the Middle East needed a solution to reach from 23 rows to 24 rows. Rather than buy new cranes, they went for the RAM Tandem retrofit and achieved an extra 1,200mm in outreach…problem solved.


“SingFlex is an adjustable tandem headblock for single hoist STS cranes. The tandem headblock is capable of handling two spreaders for lifting four 20’ or two 40/45’ ISO containers at once. This is not just ideal for customers who want to boost container handling productivity, reduce energy demands and costs, but also reaching out to that 24th row, which is an unintended consequence of SingFlex tandem,” RAM said.


WorldCargo News has heard of terminals looking for other solutions to this problem, including installing slim-line fenders, or re-examining the end stop system at the tip of the boom to try and squeak out another row of outreach. RAM’s system is likely to be easier and more cost-effective to implement, while still giving terminal operators enough lifting capacity for most containers.


With a 65t SWL under a single spreader capacity hoist, RAM said the maximum SWL for lifting one 40ft box under the tandem spreader would be circa 28 tonnes. With (a) special lightweight spreader(s) that could be increased to 34 tonnes.


Looking at lift height, some of the crane’s lift height would lost to the SingFlex headblock, which is higher than a standard headblock, but RAM said the difference is in the region of 40cm, which is a small amount. The SingFlex headblock also has sensors to detect and correct any list that occurs when lifting a single box with the system.

How the SingFlex system can give a crane another row of outreach.
How the SingFlex system can give a crane another row of outreach.
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