Reinforced Corner Seams Collapsible Storage Tear Resistant Fabric Load Testing Water Bags for Proof Load Testing

Hongruntong Marine Load Testing Water Bags are engineered specifically for the unique operational rhythms and spatial constraints of modern shipbuilding and ship repair facilities. These water bags are manufactured from a robust PVC-coated polyester fabric composite selected for exceptional resistance to incidental contact with steel weld spatter, grinding sparks, and sharp edges that characterize the shipyard environment.

The standard capacity range spans from compact 2-tonne units suitable for jib crane and monorail testing to 110-tonne configurations capable of proof loading the massive goliath gantry cranes that dominate major shipbuilding centers.

A major shipbuilding group in East Asia commissioned a new 1,200-tonne capacity goliath gantry crane. The commissioning protocol required a proof load test at 125 percent of rated capacity, representing a total suspended test load of 1,500 tonnes.

Hongruntong Marine provided a solution using fifteen 100-tonne capacity water bags deployed in a purpose-designed spreader frame configuration. The total fill time for the complete 1,500-tonne test load was 4 hours and 20 minutes, representing a fill rate of approximately 345 tonnes per hour.

The load test was completed successfully under the witness of surveyors from two classification societies. The total project cost for the water bag solution was less than forty percent of the estimated cost for solid weight alternatives.

• Weld Spatter Resistant Fabric Formulation: Specialized PVC coating formulation incorporates flame-retardant plasticizers and intumescent additives that resist perforation from welding spatter and meet ASTM D6413 for vertical flame propagation.
• Distributed Lifting Architecture for Gantry Crane Compatibility: Configured with four or more independent lifting eyes arranged in rectangular patterns matching crane lifting beam geometry, with each eye individually proof tested to full rated capacity.
• Stackable Configuration for Incremental Load Application: Multiple smaller-capacity bags can be positioned in vertical stacks separated by rigid load distribution plates, allowing graduated load application and reduced inventory requirements.
• Extended Service Life Through Abrasion-Resistant Base Layer: Secondary abrasion-resistant base layer applied to bottom surface with high-loading silica filler increases surface hardness and provides visual wear indicator.

• Newbuilding Crane Commissioning and Periodic Testing: Standardized test methodology for engine room overhead cranes, stores cranes, hose handling cranes, and provision cranes with classification society-compliant documentation.
• Dry Dock Crane Maintenance and Repair Verification: Rapid deployment and recovery for mandatory periodic load testing within compressed vessel docking periods, minimizing impact on repair schedules.
• Shipboard Lifting Appliance Testing During Outfitting: Transportable in collapsed state through vessel compartments, filled in situ using temporary hose connections, eliminating need for solid weight handling in confined spaces.

• Shipyard-Specific Design Heritage: Extensive experience in shipyard applications reflected in design details like color-contrasted lifting eyes, strategically positioned fill ports, and optimized drain port locations.
• Large-Format Manufacturing Capability: Dedicated facility with welding tables extending to over 20 meters and specialized equipment for producing water bags with capacities up to 110 tonnes as standard catalog items.
• On-Site Technical Support During Test Execution: Field service engineers provide practical support for fill rate optimization, rigging arrangement verification, and issue recognition during critical load tests.
• Comprehensive Documentation for Classification Society Submission: Complete documentation packages tailored to requirements of major classification societies including Lloyd's Register, DNV, ABS, Bureau Veritas, and ClassNK.