Water Weight Bags function as controlled-load testing instruments designed to validate the mechanical integrity and safe working load of cranes, davits, hoists, and structural platforms. Constructed using industrial-grade coated textiles and reinforced load-bearing hardware, these bags are engineered to provide highly accurate, gradually adjustable loading during proof tests.
Their technical appeal lies in precise filling control, which facilitates stepwise proof loading, enabling the detection of nonlinear structural responses before reaching full rated load. This staged approach improves test safety by eliminating sudden load application that may occur with solid weights.
From material selection to welding techniques, Water Weight Bags are optimized for marine, offshore, and industrial environments. High-strength composite fabrics provide tear resistance, puncture resistance, and stability under hydrostatic pressure.
In 2022, a large ship-repair facility in Greece faced a demanding schedule involving the acceptance testing of multiple 60-ton shipboard cranes installed on a fleet of bulk carriers undergoing retrofit. Hongruntong Marine supplied a set of custom-engineered high-capacity Water Weight Bags with load distribution beams designed specifically for the shipyard's crane hook arrangement.
During the first test, the team deployed six 10-ton bags and filled them simultaneously using manifold-controlled water supply. At approximately 70% loading, a subtle irregularity in boom tilt was observed. Thanks to the safe and controlled load environment, repairs were performed without needing to remove or relocate the bags.
After repair, tests resumed, and the crane successfully achieved full proof load. Over the fleet-wide retrofit operation, the shipyard reported a reduction of total test hours by more than 40% and significantly improved occupational safety.
| Name | Water Weight Bag |
|---|---|
| Application | Proof Load Testing, Offshore Load Testing, Structural Load Testing, Ship Load Testing, Industrial Equipment Testing, Research and Development |
| Content | 100% POLYVINYL CHLORIDE |
| Phthalate | 7P Phthalate Free (Includes all Phthalates Listed in CAL Prop 65, CPSIA and REACH) |
| Special | UV Resistant, BPA Free / Tris Free / Formaldehyde Free, Does Not Contain Conflict Minerals |
| Care Instructions | Rinse With Fresh Water And Air Dry, Do Not Store with Seawater and Keep Away From Heat Sources |
| Available sizes | 5000 kg, 8,000 kg, 10,000 kg, 15,000 kg, 20,000 kg, 30,000 kg, 50,000 kg, 100,000 kg (Special Sizes Could be Customized) |
| OEM | Supported |
| MODEL | Weight | Volume | Empty Height (Length) | Filled Height (Length) | Max Diam ( ø) | Dry Weight without accessories |
|---|---|---|---|---|---|---|
| HM-1T | 1,000 kg 2,204 lbs |
1,000 / 1 264 USG |
2.52 m 8.27 ft |
2.23 m 7.33 ft |
1.39 m 4.56 ft |
36 kg 80 lbs |
Capacities vary widely; Hongruntong Marine supplies single bags ranging from small sub-ton models up to units exceeding 50 tons, with higher loads achieved by clustering multiple bags.
No. Standard crane hooks, certified slings, and compatible shackles are typically sufficient. For specialized setups, modular spreader beams can be supplied.
