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+86-18554869267
sales@doowincn.com

Leading Professional Manufacturer of Water Weight Bags & Underwater Lift Bags

DOOWIN provides high-quality, IMCA D-016 and LEEA 051 compliant inflatable solutions for load testing, marine salvage, offshore operations, pipeline laying, and emergency response.

DOOWIN Manufacturing Facility

About DOOWIN

DOOWIN is the most professional manufacturer in the inflatable lifting and load testing industry. Equipped with the most advanced welding machines, our products undergo rigorous testing to ensure the highest safety standards.

All DOOWIN air lifting bags and water weight bags are designed, manufactured, and certified in compliance with IMCA D-016 and LEEA 051 under the control of ISO 9001:2008. Our products are certified by globally recognized bodies including SGS, LR, BV, and ABS.

6:1 Safety Factor

All water bags pass the highest class drop test with 6:1 safety factor compliance with LEEA 051.

Global Certifications

Certified by SGS, LR, BV, and ABS to ensure international quality standards.

Why Choose DOOWIN?

We pay attention to every detail — from airbag bodies to lifting belts, shackles, master links, and accessories — to deliver international-class quality.

Certified Quality

Compliant with IMCA D-016, LEEA 051, and ISO 9001:2008 standards. Trusted by global clients.

Advanced Manufacturing

Equipped with state-of-the-art welding and fabrication technology for precision and durability.

Global Service

Serving marine, offshore, oil & gas, and emergency sectors worldwide with rental and repair services.

Our Products

DOOWIN offers a wide range of inflatable solutions for load testing, marine salvage, pipeline laying, water storage, and offshore operations.

Water Weight Bags

Water Weight Bags (PLB)

Used for proof load testing of cranes, hoists, offshore rigs, lifting equipment, and platforms.

  • Standard Capacity: 650kg, 13,000kg
  • Custom sizes and shapes available
  • IMCA D-016 & LEEA 051 compliant
Underwater Lift Bags

Underwater Lift Bags (OBP)

Professionally designed for marine salvage and underwater lifting operations.

  • Lifting Capacity: 50kg ~ 50 ton
  • IMCA D-016 compliant
  • Custom configurations available
Proof Load Bags

Proof Load Bags (Low Headroom)

Ideal for confined spaces where traditional weights cannot be used.

  • High safety factor (6:1)
  • Drop test certified
  • Lightweight and portable
Lifeboat Test Water Bags

Lifeboat Test Water Bags

Designed for lifeboat and davit load testing with air and relief valves.

  • Standard Capacity: 100kg ~ 1 ton
  • Custom sizes available
  • Safe and reusable
Pipeline Buoyancy Units

Pipeline Buoyancy Units

Inflatable floats for pipeline laying and subsea buoyancy control.

  • Buoyancy: 250kg ~ 50 ton
  • Easy transport and deployment
  • Custom shapes and sizes
Portable Water Tanks

Portable Water Tanks

Bladder tanks for potable water, firefighting, agriculture, and rainwater storage.

  • Made of PVC & TPU coating fabric
  • Custom sizes and shapes
  • Oil and water compatible
Marine Salvage Bags

Marine Salvage Bags (TP)

Heavy-duty inflatable bags for ship and submersible recovery.

  • High air lifting capacity
  • Durable PVC construction
  • Custom engineering support
Inflatable Pipe Plugs

Inflatable Pipe Plugs

Used for pipeline maintenance, testing, and isolation in oil & gas and water systems.

  • High-pressure resistant
  • Multiple size ranges
  • Reusable and reliable

Our Services

From project consulting to repair, DOOWIN supports your operations at every stage.

Project Consulting

Expert advice on load testing, marine salvage, and buoyancy solutions tailored to your project.

Rental Service

Flexible rental options for water weight bags, lift bags, and testing equipment.

Proof Load Testing

Professional load testing services for cranes, davits, and lifting systems.

Repair Service

Fast and reliable repair for inflatable bags, tanks, and buoyancy units.

Recent Projects

DOOWIN has successfully completed major load testing and marine operations worldwide.

3500T Floating Crane Test

3500T Floating Crane Load Testing

March 22, 2023

700ton Crane Test

700ton Crane Proof Load Testing

December 14, 2021

1200T Crane Test

1200T Crane Proof Load Testing

September 30, 2021

50+

Countries Served

1000+

Projects Completed

6:1

Safety Factor

20+

Years Experience

Frequently Asked Questions

Are DOOWIN products certified?

Yes, all DOOWIN products are manufactured and certified in compliance with IMCA D-016 and LEEA 051 under ISO 9001:2008. They are certified by SGS, LR, BV, and ABS.

Can I rent DOOWIN products?

Yes, we offer rental services for water weight bags, lift bags, and load testing equipment. Contact us for details.

Do you offer custom sizes?

Yes, we provide customized sizes and shapes for all our inflatable products including water bags, lift bags, and buoyancy units.

What materials are used?

Our products are made from high-strength PVC and TPU-coated fabrics, ensuring durability, water/oil resistance, and long service life.

Get in Touch

For inquiries, quotes, or technical support, contact DOOWIN today.

+86-18554869267
sales@doowincn.com

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