Proof load testing services

A full range of certified testing, measurement and calibration services

Hendrik Veder Group has been providing proof load testing for decades. We operate a number of test beds with capacities from 80 to 1,400 tons. At our main testing facility in Rotterdam, experienced and EKH-certified* testing inspectors carry out proof loading of all sorts of hoisting, lifting, pulling, mooring, towing and lashing equipment. These tests are done in accordance with customer requirements, or performed according to specific industry standards (for example, periodic testing). If necessary, tests can be witnessed by third-party classification authorities.

All our test beds are calibrated by NMi (Nederlands Meetinstituut – the Dutch Measurement Institute). The test beds are categorised as Class 1 testing machines in accordance with ISO 7500.

1. Testing program

Proof load testing is generally performed with the Working Load Limit (WLL) of lifting equipment. We perform proof load testing on a wide variety of products with proof loads up to 1,400 tons. These products include shackles, blocks, hooks, lifting beams, steel wire rope or fibre rope, all types of slings, grommets and chains. We also test customised specials.

2. Break load testing to destruction

Break load and destruction is used to determine the Minimum Breaking Load (MBL) and the Actual Breaking Load (ABL). We carry out these tests on steel wire rope, grommets, wire rope slings and everything that fits in the test beds, which can be loaded up to 1,250 tons for destructive testing.

3. Calibration

Our testing machines have an accuracy of ±1%, which makes them ideal for load cell calibration services. The services also include load cell shackle calibration, calibration of mooring or towing hooks with load cells, and load pin calibration.

4. Measurement under tension

Our test beds are also ideal to determine the actual working length of steel wire and fibre rope slings, and grommets. Measurements are carried out with the product under tension.

5. Pressing

In addition to the pulling services, we also carry out pressing services with forces of up to 1,250 tons. One of the commonly carried out services is pressing out sockets, but we also test customised specials.

Testing facility Rotterdam


Capacity: Type: Max. Orientation:
1.400 tons Pulling / Pressing 7,5 m Horizontal
800 tons Pulling 50 m Horizontal **
80 tons Pulling 5 m Horizontal

* EKH (Approved Certification Companies for Hoisting and Lifting Equipment) is the Dutch association of accredited companies for the testing and lifting equipment industries.
** Six metres from the pulling point there is a three metre long and one metre deep pit for testing objects

Would you like to find out more? Please contact the Hendrik Veder Group on +31 (0)10 299 2374, +31 (0)6 464 23237, or write to


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With over 450 years of experience in our field, Hendrik Veder Group adds value to your organisation and gives you peace of mind. We are at your service as the experts in smart, sustainable solutions for managing your hoisting, lifting and towing equipment. We save your organisation precious time and help you put sustainable methods into practice.

When you are looking for a fresh solution in order to move forward. Hendrik Veder Group is ready to meet all these needs. You benefit from this flexibility and can count on us to recognise the direction you want to go and understand the issues you face. And if we don’t have a solution on hand…

Moving, lifting, towing, mooring, rigging, testing or something else? What is your challenge? We like to be challenged to provide solutions, projects, services and products significant to offshore, maritime and other markets. Ask for our service and testing program and increase your uptime and lower the cost.

The people of Hendrik Veder Group understand the stringent regulations regarding lifting, towing, mooring, rigging, and lashing equipment. We provide superior quality products and services that guarantee your safety. We made many of our products available in an extensive product catalogues.

Contact and locations