Water Weight Bags are specialized load-testing devices engineered for verifying the safe working load of lifting equipment, cranes, davits, hoists, and deck structures. Constructed from high-strength PVC or TPU composite fabrics, these bags are designed to be filled with water at the testing site, providing gradually controllable load increases.
Compared with conventional steel weights, Water Weight Bags allow operators to simulate operational loads under real conditions while maintaining full control over filling rates. The lightweight nature when empty reduces storage volume by more than 80% and enables deployment in remote locations or restricted decks where transporting metallic weights is impractical.
In 2024, a shipyard in Singapore undertook a comprehensive load-testing program for a newly installed 40-ton gantry crane used for block lifting during vessel repair cycles. Traditional dead weights were ruled out due to deck loading restrictions and the difficulty of bringing large steel masses into the dock area.
A configuration of four 10-ton bags was used, each attached with certified slings to the crane hook assembly. The gradual filling allowed the test team to monitor crane deflection and structural alignment at 10%, 25%, 50%, and full load stages.
| MODEL | Weight (kg) | Volume (Liters/m3) | Empty Height (m) | Filled Height (m) | Max Diam (m) | Dry Weight (kg) |
|---|---|---|---|---|---|---|
| HM-1T | 1,000 | 1,000 / 1 | 2.52 | 2.23 | 1.39 | 36 |
| HM-2T | 2,000 | 2,000 / 2 | 2.87 | 2.6 | 1.65 | 41 |
Load accuracy is typically within 1-2% of the rated capacity when combined with a calibrated load cell.
Yes. The bags are designed with stabilizing features and reinforced rigging to minimize sway.
