WhatsApp: +86-18554869267|sales@doowin-dooflex.com
About Us 2018-05-08T09:08:04+00:00

Leading Manufacturer of underwater lift bags & crane test water bags

Welcome you visit DOOWIN
DooFlex Flexible Engineering

The Chinese Most Professional Manufacturer
To Be Your Best Partner – Your safety is our mission!

We are committed to designing and producing the highest quality
inflatable airbags, pipe float buoys and load test water weight bags

Who we are?

DOOWIN is Chinese leading manufacturer underwater lift bags and crane test water bags in comply with international standard IMCA D016 and LEEA 051.

DOOWIN is the professional manufacturer of underwater lift bags, marine salvage pontoon, pipeline buoyancy bags, proof load testing water weight bags, lifeboat test water bags, flexible bulk liquid storage & transportation PVC tankers, marker buoys and inflatable fenders, pipe stopper. With a strong reputation for quality, DOOWIN is considered the first choice supplier by many key industry suppliers, contractors and end-users.

Our engineers and consultants have been in fabrication and use these products for more than 30 years. DOOWIN has the clients in the Diving, Marine Rescue and Salvage,  Energy and Oil, Offshore  Shipping, and other industries all over the world.

DOOWIN products passed rigorous ISO 9001:2008 Quality Management System, approved by the third party SGS, BV, CCS, ABS, LR, BV.

* DooFlex is the trademark of DOOWIN Rubber & Plastic Co.,Ltd for the flexible engineering products.

Quality is morality, Quality is integrity, Quality is respect to clients

Honesty, Hard Work, Love for Others, Responsibility
Philosophies — “People Oriented, Innovation”

DOOWIN adhere to the “People Oriented” concept. Pay attention to the application and implementation of the rules. Advocate the core value of “Honest, Hard Work, Love for Others, Responsibility”. And this core values throughout all departments and all kinds of situation management operating standards and business standards. Resolutely oppose the bureaucracy, advocating labor glorious.

Vist Home, Products & Solution, Our Service to know more information.

DooFlex always make innovation as the motivity of development, to pursue perfect as the principle of our action. Innovation is a key driver for our growth. Our strategies is based on it to provide the best possible solution for the customers.

Perform better than our competitors. For each type product and each application area, our engineers made the most reasonable configured and function design based on the abundant practical experience. From the material choose, to the equipment of each webbing harness, air valves, pressure relief valves, we considered almost all conditions. Herewith, our products are the most convenient and effective usage with the lowest cost.

Quality is the vigorous of development. Responsibility is base of quality. Each inferior product is considered as the expend of vigorous. Excellent quality will make the company keep thriving energy. Each product is the performance of our responsibility for customer and social.

Meet customers’ requirements and achieve common development. To do the leader in its chosen sectors upon research, development, and technical innovation.

Left Picture: DOOWIN at exhibition     Right Picture:  Production Process

DOOWIN at exhibition
underwater lift bags and crane test water bags

The Commitment to Quality is Our Top Priority
“Quality is morality, Quality is integrity, Quality is respect to clients”

Quality Assurance

DOOWIN underwater lift bags and crane water bags are designed, manufactured and tested
fully compliant with the international industry standard IMCA D016 and LEEA 051. 

DOOWIN crane test water bags are dynamic drop test type certificated with 6:1 Safety Factor.

 DooFlex aim at a high and constant level of quality. The quality assurance systems of DOOWIN has been approved by international organization in accordance with Quality Management System ISO 9001:2008. We are proud of the qualification and honor created by our integrated teams, in a variety of different industries. In order to ensure the quality of key elements of air lift bags and proof load bags, all accessories, such as heavy duty webbing straps, shackles and master links, and air fill connection and valves, are also bought from the company certificated comply with ISO 9001.

inspection of underwater lift bags and crane test water bags

We implement our basic quality philosophies from the design to the inspection of all products.
“Quality is morality, Quality is integrity, Quality is respect to clients”

We did the prototype test for crane test water bags and underwater lift bags. We also can do the drop test and burst test upon client’s special request.

DOOWIN inspect and test each DOOWIN underwater lift bag and crane test water bag prior to delivery. For each commercial underwater lift bag or crane test water bag, the main inspection include the air-tightness test, dimensional inspection, assembly inspection, load testing, and other detailed inspection/test.

ABS, BV, LR, CCS third party certificate are available upon request too.

DOOWIN crane load test water bags have the word-class quality level. Crane test water bags were drop-tested at the TUV National Engineering Laboratory, and gained type test accreditation at the 6:1 safety factor to meet LEEA Guidance 051.

IMCA D-016 is the international industrial standard for the underwater lift bags and buoyancy bags. All DooFlex air lift bags are tested to meet this standard, to meet or exceed the requirement for the safety  factor 5:1

LEEA 051 is seen as the international industry standard of crane test water bags. It explicit the requirements for the elements of lifting set, which is separate from the water bags, drop test way and pressure test way to verify the water bags.

We create outstanding products always … … Professional Cast Quality


Our experienced engineers and workers design and manufactured the qualified products.
We use the first-class extreme heavy duty polyurethane coated fabric.
The advanced production technology and management system can help to control the cost well, to offer client the best price. 

Build for Performance

underwater lift bags material test
PVC coating fabric is basic to ensure the water and lifting bags work well. DOOWIN use the equivalent material with UK manufacturer, which is better than USA, Turkey and Chinese suppliers.

High Quality Accessories

crane test water bags water hoses
In order to ensure the overall performance of water bag and lift bag system, DOOWIN use the high quality accessories, shackles, masterlink, water hoses, lifting belts. We pursue the perfect of each accessory.

Reasonable Structure Design

crane test water bags
DOOWIN engineers did the complex strict design and test in order to ensure the best and reasonable water-pressure distribution. Abandoned the foreign top-bottom welding technology. Our each piece is integral from top to bottom.

Professional Cast Quality

manufacturer of underwater lift bags and crane test water bags

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

Stephen Barnett, MODEC (Singapore)

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

Dr.Chen, China Harbour (Aramco Project)

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

Hugo Silva (Project Manager), McDERMOTT

Please feel free to contact our professional team!

Mobile: +86-185 5486 9267 (WhatsApp)
Email: sales@doowin-dooflex.com

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