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Container weighing system

Strainstall's Container Weight System (CWS)™ seamlessly integrates load monitoring technology onto existing container handling equipment, with no operational impact to ports and terminals.

CWS™, specifically developed to meet the International Maritime Organisation's amendments to SOLAS safety guidelines, delivers accurate weight verification data in real-time, as part of a ports regular lifting cycle.

UPDATE: CWS™ now has full EU-type approval!

Fully configurable to your specific spreader based cargo handling equipment, CWS™ seamlessly integrates into existing terminal operating systems (TOS), giving a simple and automated process for producing verified gross mass (VGM) for SOLAS compliance. 

Download our Container Weight System™ brochure (1.9MB)


The award winning Container Weight System™

Port Technology International interviews Strainstall's managing director, Simon Everett, on the SOLAS VGM rules that ports and terminals need to know

Watch more CWS™ videos


“We assessed a number of different options to be able to offer a container weighing service to our customers and selected Strainstall’s system because it doesn’t require any changes to our port operating procedures and is quick to install. The trials demonstrated an accuracy above our expectations.”

Nick Loader, chief executive officer, DP World Southampton

Fully compatible container weighing solution

Strainstall’s CWS™ is designed to be retrofitted to existing container handling equipment with no modification required enabling quick and easy installation in about an hour. Working closely with original equipment manufacturers (OEMs) CWS™ is fully adaptable to suit all the major crane and spreader manufacturers’ equipment.

The system can be retrofitted into the spreader headblock or at the twistlock making it a permanent feature of the container handling equipment with minimal wear. Alternatively, the twistlocks themselves can be replaced if 20ft twinlift spreaders are used.


Different CWS™ configurations
View full spreader image  View full reach stacker image

View full RTG image 

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Strainstall's CWS™ solution has been specifically developed to meet container weight verification regulations with minimal impact to port and terminal operations.

CWS™ has successfully achieved full Automatic Weighing Instruments EU-type approval from the National Measurements and Regulatory Office.

Features Benefits
Accuracy exceeds industry expectations and is a fully certified system Full compliance to SOLAS regulations
Weight obtained during the normal lifting cycle No delay to port or terminal operations
Retrofit solutions for all existing spreader based container handling systems Flexible integrated solution
TLS can be used to extend twistlock service life based on lift data Reduces ongoing twistlock replacement costs
Full TOS integration, with data output in various analogue / digital formats Seamless process for producing VGM
Load pin non-consumable system Low maintenance costs
Identifies eccentrically loaded and overloaded containers Improved safety
Simple to install - no modification required to existing equipment Reduced installation costs resulting in minimal downtime
Modular 'plug and play' spares system with no ongoing servicing Minimises potential system downtime
Simple on-site calibrations with no need to remove the equipment Low running costs and easy to maintain
No driver intervention required - fully automatic system Eliminates potential for human error, no training required
Rugged proven technology - vibration and shock resistant Highly reliable for long life and low maintenance
On-board data logging Historical data available for analysis and a backup to TOS system
Wireless system options Quick installation and eliminates the risk of cable damage
Optional 3G / 4G modem for remote access Enables remote commissioning, operational support and upgrades
Small and lightweight system with minimal power requirements Simplifies installation

Successful trials prove Strainstall's Container Weight System™ delivers extremely high accuracy levels.

Successful trials of the latest generation Container Weight System™ at some of Europe's largest container terminals have resulted in 100% of all data points falling within ± 300 kgs up to 20 tonne and 1.5% of the load beyond 20 tonne - giving you full confidence in the performance of CWS™ to ensure SOLAS compliance.

Download the full CWS™ trial report (2.6MB).

To find out more about container weighing with Strainstall, register to receive the CWS newsletter:

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