Water Weight Bags

Water weight bags are simple and safe water filled crane test weights designed to provide proof load testing instead of traditional solid load test weights.

DOOWIN load test water weight bags are designed for proof load testing the lifting equipment and structures that request proof load weight testing.  When it’s newly finished, or periodic check or maintenance. Such as crane load testing, beam load test, lifeboat davit load test, derrick load testing, overhead crane load test. So, this water-filled water weight bags offer one kind of innovative crane load test weights solution. Most noteworthy, it has the advantages of Safety, Economy, Convenience, High Efficiency.

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Physically Proven Safety Factor
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Maximum Capacity Water Bag
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Economic Efficiency
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Project Success Rate
crane load test with water weight bags
300ton crane load test weights
boatlift load testing
power station crane load test weights
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Specification and Advantages

Proof load test water weight bags is one crane load test weights system including water filled weight bags and all its accessories. Moreover, these water weight bags are designed that the lifting set is separate from the water bag body. As a result, the failure of any one webbing element will not result in failure of the lifting set nor cause a local overload of the weight test water bags.

Masterlink & Shackles

 Top quality master link and shackles Made in China, EN 1677 or EN 13889.

Polyester Webbing Lifting Straps

EN1492-2:2000 and EN1492-1:2000. Provide Certificate of Conformity.

Filling & Drain Water Hoses

High-quality PVC and TPU high-pressure hose with valves and camlocks.

Complete Accessories

Equipped all fittings. Ready for use. Include repair material free of charge.

Standard crane test water weight bags capacity is from 1ton to 100ton.


The below specification is a common size load test weights. In addition, we also make other size and capacity load test water bags upon request. We also make the low height proof load bags used for the low headroom projects.


Note: Gross Weight is shipment weight after packaging with all accessories. The above specification only for your reference. We maybe change its size without notice. 

specification-of-proof-load-bagswater weight bags size

Type Certificated by Drop Test
Comply with LEEA 051

Our water weight bags are designed manufactured, tested and
certificated in 100% compliance with LEEA 051 guidelines.

Highest Quality Water Weight Bags

Load test water weight bags are manufactured with the highest quality PVC coating fabric material SGS certificated. Our water weights bags are manufactured and tested comply with the LEEA 051 Guidance. In addition, we can provide BV, ABS, LR third-party certificate upon request.
Visit About Us to get more information.

DOOWIN Certificate LOGO

Certificate of Type Test

6:1 safety factor type verified by drop test at UK NEL TUV. Meet the industry highest standard.

water weight bags type certificate

BV Inspection Certificate

BV, ABS, LR third Party Certificate comply with LEEA 051. Ensure the quality of your every order.

water-weight-bags-BV-certificate

SGS Material Certificate

Made of 1900g high strength UV resistant PVC coated fabrics. Tensile strength reach 1000N/5cm.

SGS-material-certificate

Our Clients

Modec logo

Excellent quality water weight bags and reliable service, they deliver exactly what they agree to and perfectly on time.

Stephen Barnett, MODEC (Singapore)
China harbor logo

Awesome to use DOOWIN buoyancy bags for our Aramco project. Its quality completely can be comparable with UK products.

Dr.Chen Haijun, China Harbour (Aramcot)
Mcdermott logo

We have confidence with DOOWIN. They can help us with an innovative solution, well prepared to accommodate to our request.

Hugo Silva (Project Manager), McDERMOTT
water weight bags clients

What capacity water weight bags?
What capacity crane do you want to test?

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Mobile: +86-185 5486 9267 (WhatsApp)
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