HONGRUNTONG Load Bags Quick Fill Highly Portable Safe Durable Reusable

Product Specification

HONGRUNTONG Load Bags Quick Fill Highly Portable Safe Durable Reusable

Description
 

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. Unlike traditional steel test weights, Water Weight Bags are transported and installed with minimal logistical effort due to their lightweight and collapsible form when empty. Once positioned, they are filled with water sourced directly on-site, allowing complete control over loading rates and test profiles.

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. The water-filling system allows real-time pausing or reduction of load in case unexpected behaviour or mechanical anomalies arise, making the method inherently safer for both personnel and equipment.
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. UV protection and saltwater-resistant coatings ensure durability in harsh maritime conditions. Certified rigging systems ensure secure load transfer and compliance with international standards such as ISO, DNV, and ABS.
Because Water Weight Bags can be deployed in areas with limited footprint, they are ideal for confined machine rooms, narrow quayside locations, or offshore structures with stringent deck-load limits. Their ability to fold and store compactly significantly reduces long-term operational costs. In many facilities, such bags have replaced steel counterweights entirely for routine maintenance proof tests.

Case Study

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. Moving heavyweight steel blocks around dry-dock pits posed significant operational risks and required lengthy crane reconfigurations. The facility sought a safer method that could be executed within tight time constraints. 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. The bag configuration allowed accurate monitoring of individual load increments, and onboard technicians tracked crane-boom deflection against manufacturer tolerances. At approximately 70% loading, a subtle irregularity in boom tilt was observed. Engineers paused the loading sequence and discovered a misaligned bearing seat within the boom pivot assembly. 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, owing to the elimination of mechanical weight transfers. This experience led the shipyard to adopt Water Weight Bags as their standard for all crane-acceptance protocols.

Specifications

Features
 

High Capacity Load Efficiency with Reduced Structural Footprint

These Water Weight Bags are engineered to generate substantial loading capacity without imposing the rigid footprint associated with steel weights. The soft-side structure allows the bag to contour naturally under hydrostatic pressure, requiring minimal deck clearance while minimizing point-loading. This is particularly useful in environments with structural load limitations or confined working areas. The bags’ flexibility ensures uniform contact surface distribution, preventing deck damage and localized stress hotspots. This high-capacity efficiency allows engineers to perform full-scale tests with significantly fewer logistical adjustments.

Precision Fill and Drain Management System

The integrated fill-and-drain system includes oversized ports, multi-stage valves, and optional quick-connect couplings. These components create a finely adjustable loading environment where filling speed, load increments, and drainage sequences can be tuned precisely to match test procedures. Operators can maintain stable filling pressure and stop loading instantly when required. Additionally, the drainage ports are configured to empty high-volume bags rapidly, reducing downtime between tests. This system’s responsiveness enables dynamic load monitoring and makes the Water Weight Bags suitable for both static and functional tests.

Ruggedized Outer Architecture with Engineering Grade Coatings

The external coating is formulated to resist chemicals, hydraulic oils, abrasions, and UV degradation. This makes the bags exceptionally durable even in demanding industrial zones such as refineries, shipyards, and offshore platforms. The structural fabric includes a reinforced weave that maintains dimensional stability, ensuring the bag performs consistently throughout repeated proof-load cycles. The protective coating also improves tear resistance, while internal stress-diffusion panels strengthen areas subjected to concentrated tension. These engineering-grade enhancements deliver extended service life and reliability.

Interchangeable Rigging Interfaces for Multi Configuration Testing

Hongruntong Marine designs the bags with modular rigging interfaces, allowing operators to switch between vertical lifting, basket arrangements, or spreader-beam distribution setups. This adaptability supports an extensive range of load-test configurations, from single-point crane hooks to multi-point lifting frames on heavy-lift equipment. Each bag is compatible with certified shackles, slings, load cells, and other lifting accessories. This modularity maximizes operational utility and reduces the need for specialized, single-purpose testing gear.

Applications

Load Testing for Container-Handling Equipment

Container terminals rely on large gantry cranes, rubber-tyred gantries, straddle carriers, and ship-to-shore cranes. Water Weight Bags provide an efficient solution for conducting compliance tests, functional assessments, and emergency load simulations without disrupting terminal traffic or requiring heavy transport logistics.

Testing of Shipboard Rescue and Handling Systems

Systems such as rescue-boat davits, provisions cranes, and embarkation hoists require routine proof loading to ensure reliability during emergency conditions. Water Weight Bags offer controlled loading that replicates real-world operational stress without risking sudden impact forces.

Load Verification for Large-Scale Industrial Installations

Manufacturing plants and industrial facilities use Water Weight Bags to assess the structural capabilities of overhead cranes, monorail hoists, and mezzanine support structures. The ability to fine-tune applied loads ensures compliance with safety regulations and supports preventive maintenance planning.

Why Choose Hongruntong Marine

Industry Leading Fabrication Quality with Marine-Grade Standards

Hongruntong Marine applies stringent quality assurance protocols, including destructive seam testing, fabric tensile verification, and controlled batch traceability. Each Water Weight Bag is produced under certified manufacturing standards tailored to the maritime sector. The company’s engineering processes exceed baseline requirements, ensuring products provide consistent performance under demanding conditions.

Tailor Made Engineering Designs for Specialized Operations

Customers benefit from tailored engineering solutions, including custom bag capacities, reinforced lifting beams, extended inlet configurations, and multi-bag clusters for large-scale tests. Hongruntong Marine collaborates directly with client engineering teams to design test plans, ensuring that bag configurations align precisely with operational, spatial, and regulatory needs. This personalized approach significantly enhances the efficiency and reliability of testing operations.

End to End Technical Support and Long Term Maintenance Programs

The company provides comprehensive technical support before, during, and after deployment. Services include onsite commissioning, operator training, real-time troubleshooting, and scheduled maintenance programs. Hongruntong Marine also offers periodic inspection services and provides detailed test records for regulatory audits. This end-to-end support minimizes risk and extends the useful life of each Water Weight Bag.

International Logistics Network and Fast Response Capability

Strategically located inventory hubs and strong logistics partnerships enable Hongruntong Marine to deliver Water Weight Bags and spare components rapidly across global maritime regions. Emergency dispatch options ensure customers can conduct urgent load tests with minimal delay. The company’s rapid-response capability has made it a preferred supplier for shipyards, offshore operators, and industrial clients worldwide.

FAQ

1. What is the maximum capacity available for a single Water Weight Bag?

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.

2. Do the bags require special lifting equipment?

No. Standard crane hooks, certified slings, and compatible shackles are typically sufficient. For specialized setups, modular spreader beams can be supplied.

3. How resistant are the bags to abrasion and impact?

The coated textile and reinforced outer layers offer high abrasion resistance. While the bags are not intended for sharp-impact environments, the materials withstand rough handling typical of shipyards and industrial sites.

4. Can these bags be used for dynamic load testing?

Yes. The stability of the water mass and reinforcement features allow use in limited dynamic-loading scenarios, provided procedures follow safe engineering guidelines.

5. What maintenance is required after testing?

Bags should be rinsed, inspected visually, dried thoroughly, and stored in a clean, shaded location. Valve seals and rigging components should be checked before each reuse.