Water Load Test Bags Leak Proof Welded Seams No Solid Weights Required Rapid On Site Fill Drain
Hongruntong Marine Load Testing Water Bags are purpose-engineered flexible lifting weights designed specifically for the demanding requirements of offshore hydrocarbon production and subsea construction support activities. The product family encompasses a comprehensive range of capacities from compact 500 kg units suitable for lifeboat davit testing to 85-tonne behemoths capable of proof loading the largest pedestal cranes deployed on deepwater floating production systems.
Case Study: Deepwater Drillship Pedestal Crane Recertification – Gulf of Mexico
A sixth-generation deepwater drillship operating under long-term charter to a major international oil company required the five-year recertification of its two 85-tonne capacity main deck cranes while on station at the operator's Gulf of Mexico development field. The drillship's operational schedule permitted a maximum weather window of 72 hours for completion of both crane tests, and the remote location precluded any possibility of mobilizing solid test weights from shore-side facilities.
Hongruntong Marine supplied two 85-tonne capacity water bags configured with extended 30-meter fill hoses and stainless steel camlock fittings matched to the drillship's firewater pump discharge connections. Each bag was delivered with a serialized calibration certificate documenting the as-built empty weight and the precise fill volume required to achieve the rated 85-tonne test load when filled with seawater of the specific gravity measured at the drillship's operating location.
The entire test sequence for both cranes was completed in 31 hours from mobilization of the first bag to stowage of the second, well within the available weather window. The drillship's marine superintendent subsequently directed that Hongruntong Marine be designated as the sole source for all future water bag requirements across the operator's entire contracted drillship fleet.
Specifications
| Name |
Load Testing Water Bags |
| 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) |
| Backing Material Size |
1.8/2.0 MM X 1.55M, Thickness Produced as Per your Request |
| Weight |
37.1 oz square yard/ 1450 +- 50 GSM |
| Special |
UV Resistant, 7P Phthalate Free, 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 |
Detailed Specifications Table
| 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 L / 1 m³ / 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 L / 2 m³ / 528 USG |
2.87 m / 9.41 ft |
2.6 m / 8.5 ft |
1.65 m / 5.43 ft |
41 kg / 90 lbs |
| HM-3T |
3,000 kg / 6,613 lbs |
3,000 L / 3 m³ / 792 USG |
3.38 m / 11.11 ft |
2.97 m / 9.75 ft |
1.82 m / 6.0 ft |
50 kg / 110 lbs |
| HM-4T |
4,000 kg / 8,818 lbs |
4,000 L / 4 m³ / 1,056 USG |
3.41 m / 11.22 ft |
3.07 m / 10.1 ft |
1.88 m / 6.16 ft |
64 kg / 141 lbs |
| HM-5T |
5,000 kg / 11,023 lbs |
5,000 L / 5 m³ / 1,320 USG |
4.14 m / 13.60 ft |
3.52 m / 11.58 ft |
2.13 m / 7.0 ft |
80 kg / 176 lbs |
| HM-6T |
6,000 kg / 13,227 lbs |
6,000 L / 6 m³ / 1,585 USG |
4.39 m / 14.41 ft |
3.91 m / 12.83 ft |
2.28 m / 7.48 ft |
86 kg / 189 lbs |
| HM-8T |
8,000 kg / 17,636 lbs |
8,000 L / 8 m³ / 2,113 USG |
4.54 m / 14.91 ft |
3.93 m / 12.91 ft |
2.52 m / 8.27 ft |
104 kg / 230 lbs |
| HM-10T |
10,000 kg / 22,046 lbs |
10,000 L / 10 m³ / 2,641 USG |
5.18 m / 17.0 ft |
4.49 m / 14.75 ft |
2.70 m / 8.90 ft |
130 kg / 286 lbs |
| HM-12.5T |
12,500 kg / 27,558 lbs |
12,500 L / 12.5 m³ / 3,302 USG |
5.43 m / 17.91 ft |
4.62 m / 15.16 ft |
2.86 m / 9.39 ft |
154 kg / 340 lbs |
| HM-15T |
15,000 kg / 33,069 lbs |
15,000 L / 15 m³ / 3,962 USG |
6.24 m / 20.50 ft |
5.48 m / 18.00 ft |
2.95 m / 9.70 ft |
159 kg / 350 lbs |
| HM-20T |
20,000 kg / 44,100 lbs |
20,000 L / 20 m³ / 5,283 USG |
6.78 m / 22.25 ft |
6.04 m / 19.83 ft |
3.42 m / 11.25 ft |
224 kg / 492 lbs |
| HM-25T |
25,000 kg / 55,115 lbs |
25,000 L / 25 m³ / 6,604 USG |
7.51 m / 24.66 ft |
6.40 m / 21.0 ft |
3.75 m / 12.33 ft |
315 kg / 695 lbs |
| HM-35T |
35,000 kg / 77,161 lbs |
35,000 L / 35 m³ / 9,246 USG |
8.07 m / 26.50 ft |
7.11 m / 23.33 ft |
3.91 m / 12.83 ft |
417 kg / 920 lbs |
| HM-40T |
40,000 kg / 88,184 lbs |
40,000 L / 40 m³ / 10,566 USG |
8.71 m / 28.58 ft |
7.72 m / 25.33 ft |
4.07 m / 13.36 ft |
440 kg / 970 lbs |
| HM-50T |
50,000 kg / 110,231 lbs |
50,000 L / 50 m³ / 13,208 USG |
8.99 m / 29.50 ft |
7.77 m / 25.50 ft |
4.56 m / 14.96 ft |
544 kg / 1200 lbs |
| HM-100T |
100,000 kg / 220,462 lbs |
100,000 L / 100 m³ / 26,420 USG |
11.27 m / 37.00 ft |
10.00 m / 32.9 ft |
5.65 m / 18.56 ft |
952 kg / 2100 lbs |
Features
Marine Grade Biocide-Enhanced Fabric Formulation
The extended deployment durations typical of offshore operations expose water bags to environmental conditions that accelerate the degradation of conventional industrial fabrics. Hongruntong Marine addresses this challenge through a proprietary PVC compounding process that incorporates a multi-component biocide system specifically selected for its efficacy against the marine fouling organisms prevalent in tropical and subtropical waters.
Fatigue-Resistant Lifting Eye Design for Dynamic Loading
The lifting eyes of an offshore crane test bag are subjected to loading conditions that differ fundamentally from those encountered in shoreside applications. The combination of vessel motion, wind-induced load swing, and the dynamic response of the crane structure introduces cyclic stress components that can initiate fatigue cracking in inadequately designed lifting hardware.
Calibrated Fill Volume Tables for Seawater Application
The relationship between fill volume and suspended weight is dependent on the specific gravity of the fill medium, a variable that is not accounted for in the nominal capacity ratings of generic water bags. Seawater specific gravity varies significantly across the world's oceans, ranging from approximately 1.020 in the brackish outflow regions of major river deltas to 1.035 in the highly saline waters of the Persian Gulf and the Red Sea.
Rapid Deployment Fill and Drain System
The compressed operational timelines characteristic of offshore maintenance campaigns demand that load testing activities be completed with minimum interruption to the primary mission of the installation. A drillship or production platform generating daily operating revenues measured in hundreds of thousands of dollars cannot tolerate extended periods of crane unavailability while test weights are laboriously filled through undersized hose connections.
Applications
Offshore Pedestal Crane Recertification
Offshore installations are equipped with pedestal-mounted cranes that provide the sole means of transferring cargo between the installation and visiting supply vessels. These cranes are typically rated for capacities ranging from 15 tonnes on smaller satellite platforms to over 100 tonnes on large floating production units, and they operate in an environment that is unforgiving of mechanical failure.
Lifeboat and Davit Load Testing on Floating Production Units
Floating production storage and offloading vessels and other offshore floating installations are equipped with totally enclosed motor-propelled survival craft that are deployed by gravity or stored-energy davit systems. These survival craft are the installation's last line of defense in the event of a major emergency requiring abandonment, and their launching appliances must be maintained in a state of readiness that guarantees reliable deployment under all conditions of vessel trim and heel.
Subsea Construction Support Activities
The installation of subsea manifolds, pipeline end terminations, suction anchors, and other heavy seabed infrastructure frequently requires the use of temporary ballast to adjust the buoyancy or trim of the installation vessel or the structure being deployed. The precise control of submerged weight is critical to the success of these operations, as an under-ballasted structure may exhibit uncontrolled motions during descent through the water column while an over-ballasted structure may exceed the capacity of the deployment crane or impose unacceptable loads on the installation vessel's motion compensation system.
Why Choose Hongruntong Marine
DNV Type Approval and Classification Society Recognition
Hongruntong Marine water bags have been awarded Type Approval certification by DNV, confirming that the design, materials, and manufacturing processes comply with the applicable requirements of DNV Standard for Certification No. 2.22 for Lifting Appliances. The Type Approval process involved a comprehensive review of our design calculations, material specifications, welding procedures, and quality assurance documentation by DNV engineering personnel.
Global Logistics and Offshore Delivery Capability
The successful execution of an offshore load testing campaign requires not only a capable product but also a reliable logistics chain that ensures the product arrives at the offshore location on schedule and in serviceable condition. Hongruntong Marine maintains a network of freight forwarding partners specializing in the unique requirements of offshore logistics support.
Engineering Support for Non-Standard Test Configurations
The standard Hongruntong Marine product catalog addresses the majority of load testing applications encountered in routine marine operations. However, our customers occasionally present requirements that fall outside the scope of the standard product offering.
In-Service Recertification and Life Extension Programs
The capital investment represented by a comprehensive inventory of load testing water bags can be substantial, particularly for operators with large crane fleets or for service companies that provide load testing as a commercial service. Hongruntong Marine supports our customers in maximizing the return on that investment through a structured recertification and life extension program.
FAQ
1. Can Hongruntong Marine water bags be filled with seawater directly from the ocean without filtration or treatment?
Yes, Hongruntong Marine water bags are specifically designed and constructed to tolerate direct filling with unfiltered seawater. The internal PVC coating is chemically inert with respect to the dissolved salts and minerals present in seawater, and extensive laboratory testing has confirmed that extended contact with seawater does not cause plasticizer extraction, polymer degradation, or any other mechanism that would compromise the integrity of the coating or the underlying fabric.
2. What is the expected service life of a Hongruntong Marine water bag in regular offshore service?
The service life of a water bag is dependent on multiple factors including the frequency of use, the care exercised during handling and storage, the environmental conditions to which the bag is exposed, and the nature of the fill media employed. Hongruntong Marine water bags in offshore service with a major North Sea operator have accumulated over 500 documented fill-drain cycles across a seven-year period without any measurable degradation in mechanical properties or reduction in safe working load.
3. Are Hongruntong Marine water bags suitable for use in hazardous areas where flammable atmospheres may be present?
The materials of construction of Hongruntong Marine water bags are inherently non-sparking and do not present an ignition hazard under normal conditions of use. The fabric substrate and PVC coating are electrically non-conductive and do not accumulate static charge during filling operations with water, as the high dielectric constant of water and the intimate contact between the water and the bag interior provide a continuous path for charge dissipation.
4. What documentation is supplied with each Hongruntong Marine water bag?
Each water bag is delivered with a comprehensive documentation package that provides the customer with complete traceability of materials and manufacturing processes, as well as objective evidence of the bag's rated capacity and proof testing. The package includes a Certificate of Conformity affirming that the bag has been manufactured in accordance with the applicable design specifications and quality assurance procedures.
5. How are Hongruntong Marine water bags packaged for shipment to offshore locations?
Water bags are folded to a compact configuration following a standardized folding pattern that minimizes creasing and prevents the formation of sharp bends that could initiate stress cracking in the fabric coating. The folded bag is placed within a heavy-duty woven polyethylene shipping bag that provides protection against abrasion, UV exposure, and incidental contact with sharp objects during transport and intermediate storage.
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