Water Weight Bags are precision-engineered proof-loading devices designed for controlled, safe, and cost-effective testing of cranes, lifting frames, davits, hoists, cargo-handling gear, and deck structures. Manufactured using advanced multi-layer coated textiles and reinforced lifting frameworks, they enable accurate and gradual loading that eliminates the hazards associated with sudden weight application.
When empty, the bags are highly compact and lightweight, allowing technicians to transport them easily to remote sites, confined platforms, or elevated structures without requiring forklifts or heavy-haul logistics. Once installed, the bags are filled with water drawn locally from seawater, freshwater, or onboard tanks, ensuring flexible deployment in diverse operational environments.
The controlled fill procedure is one of the key advantages. Operators can gradually increase load levels, stopping at critical checkpoints to record deflection, monitor mechanical responses, and ensure that the equipment under test remains within tolerance. This level of fine control is not possible with traditional fixed weights.
In 2024, a major Middle Eastern port began a modernization project that included the installation of several new 80-ton mobile harbour cranes. Before commissioning, the port authority required full proof loading and functional testing to certify the cranes according to international operating standards.
Hongruntong Marine supplied a full suite of high-capacity Water Weight Bags designed to reach the required load using five modular bag groups of 16 tons each. The testing team used spreader beams to arrange the bags safely under the crane hook. During filling, they monitored load progression via digital load cells integrated with the hoisting control system.
Thanks to the use of Water Weight Bags, the port completed its full test program without disrupting cargo traffic. Overall load testing time was reduced by 35%, and the operational risk footprint decreased substantially compared to traditional solid-weight methods.
| 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) |
| Weight | 37.1 oz square yard/ 1450 +- 50 GSM |
| Special | UV Resistant, BPA Free / Tris Free / Formaldehyde Free, Does Not Contain Conflict Minerals |
| Available sizes | 5000 kg, 8,000 kg, 1,0000 kg, 15,000 kg, 20,000 kg, 30,000 kg, 50,000 kg, 100,000 kg, Special Sizes Could be Customized |
| 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 |
| HM-2T | 2,000 kg 4,409 lbs |
2,000 / 2 528 USG |
2.87 m 9.41 ft |
2.6 m 8.5 ft |
1.65 m 5.43 ft |
41 kg 90 lbs |
The bags are designed with internal reinforcement and controlled expansion zones that stabilize shape and prevent sudden deformation as pressure increases.
Yes. When paired with calibrated load cells, the system achieves precise incremental loading suitable for compliance with strict international standards.
