Our innovative deck and floor testing water bags deliver precision-engineered surface loading with unmatched consistency.
Designed to outperform conventional solid weights, these systems offer:
Rapid deployment with minimal labor requirements. On-site repositioning without heavy equipment.
90% lighter than equivalent solid weights during transport. Standard shipping containers accommodate full systems.
Programmable gradual loading (3-7 day cycles typical). Real-time monitoring via ISO-certified flowmeters (±1.5% accuracy).
Patented manifold technology enables synchronous multi-unit filling. Modular design supports projects from 5 to 5,000+ metric tons.

DOOWIN provides turnkey solution for:
• Bridge load ratings • Marine terminal decks • Aircraft hangars
• Floor capacity verification • Elevator stress tests • Historical preservation
• Offshore platform testing • Shipyard conversions • Heavy machinery foundations
The below specification is a common sizes proof load bag. In addition, we also make other size and other capacity load test water bags upon request.
Model | Capacity (kg) | Capacity (lbs) | L x W x H (mm) | L x W x H (ft) |
|---|---|---|---|---|
PTB-1 | 1,000 KG | 2,205 | 3.0 x 1.3 x 0.3 | 9.8 x 4.6 x 1.0 |
PTB-2 | 2,000 KG | 4,409 | 3.0 x 1.4 x 0.5 | 9.8 x 4.6 x 1.6 |
PTB-3 | 4,000 KG | 8,818 | 3.5 x 1.5 x 0.8 | 11.5 x 4.9 x 2.6 |
PTB-5 | 5,000 KG | 11,023 | 2.5 x 2.5 x 0.95 | 8.2 x 8.2 x 3.1 |
PTB-8 | 8,000 KG | 17,637 | 4.0 x 2.0 x 1.0 | 13.0 x 7.0 x 3.0 |
PTB-16 | 16,000 KG | 35,274 | 8.0 x 2.0 x 1.0 | 26.2 x 6.6 x 3.3 |
PTB-25 | 25,000 KG | 55,116 | 4.2 x 4.2 x 1.5 | 13.6 x 4.15 x 4.9 |
PTB-35 | 35,000 KG | 77,162 | 5.6 x 5.6 x 1.5 | 18.4 x 18.4 x 4.9 |
PTB-1000 | 100,000 KG | 220,462 | 8.4 x 8.4 x 1.8 | 27.6 x 27.6 x 6.0 |
Note: The above size and weight are only for reference. We may change its parameters according to our design.




We offer specially designed sausage-type water-filled proof load bags to do the Static and dynamic testing for the lifeboats and davits
We offer specially designed elongated sausage type water-filled proof load bags to test gangways.
Pillow-type water tanks can be used to verify the structural integrity of buildings, bridges, elevators, loading ramps, gangways, accommodation, ladders, and decks.
Water-filled proof load bags offer an easy, safe, and cost-effective way to load test lifting equipment and load-bearing structures.
DOOWIN maintains an extensive inventory of proof-load testing equipment, such as water-weight bags, load cell/Dynamometers, wire ropes, round slings, pumps, and water hoses. Our engineers and workers are very experienced with load testing.