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Proof Load Testing Services

Proof load testing of equipment is performed to establish fitness for use. Proof load testing is generally performed prior to initial use, periodically to confirm on-going fitness for use, and also following repairs to critical load carrying components.

Requirements From OSHA

Does your organization regularly load test overhead cranes and hoists? Load testing is required and ensures overhead hoist and crane safety. An initial inspection on new equipment is mandatory followed by periodic maintenance inspections according to OSHA. This testing reveals functional errors and lowers the risk of a serious accident involving overhead cranes and hoists. 

Proof Load Equipment

In addition to cranes, equipment and machines which are typically proof load tested include: lift beams, spreader beams, custom lift frames, slings, custom sling configurations, hoisting frames, derricks, pad-eyes, winch foundations, and other load-bearing structures. Hydro-Wates® can provide certification of proof load test results for our proof load testing services using water bags to nationally and internationally recognized standards specified by API, OSHA, ASME, NSTE, IMO and others.

Generally proof load testing is performed at loads in the range of 10% to 25% over the normal working load limit (WLL) of the device being tested. However, in some cases, the test load is greater and should always be in accordance with the manufacturer’s recommended practice.

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proof load testing services

Water Bag Uses

Cargo gear proof load testing

Lifesaving appliance proof load testing

Cargo crane proof load testing

Dynamic proof load testing

Heavy Construction

Hydro-Wates® provides equipment and services to load test site cranes, building steel work & frames, elevators, ramps, platforms, and various other structures. We can perform this work using water bags, solid test weights, or specially designed hydraulic machines.

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Ship Building & Repair

Repair work performed on shipboard cranes is frequently inspected by proof load testing the crane prior to reinstating it to service. This work is often performed on tight turn around schedules, with no margin for delays due to faulty proof load equipment. For this reason, Hydro-Wates® maintains an extensive inventory of its own water bags, load cells, rigging and pumps. All of this equipment is maintained by our own personnel.


Load testing manufacturing plant cranes is frequently performed following initial installation or following repairs. This work often requires work stoppage in your plant, so getting the load test performed quickly and correctly is critical. For this reason, Hydro-Wates® maintains an extensive inventory of water bags, load cells, rigging and pumps. All of this equipment is maintained by our own personnel.

Why Choose Hydro-Wates®?

The proven benefits of sourcing your load testing equipment and services from the professionals at Hydro-Wates® include:

Improved safety for field personnel

Cost-effectiveness and superior budget control

Vital protection for your material assets

An easier route to standards compliance

Top-rated equipment in the industry

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Available 24/7877-643-9990


Address8100 Lockheed Ave
Houston, Texas 77061