Hydraulic Burst Test of Evergreen ship launching marine airbags
Hydraulic burst experiment is the ultimate test for the Ship Launching Marine Airbags’ performance, material, manufacturing technique and structure type. Meanwhile, Hydraulic burst test also can be used to confirm the safety working pressure. But, there hasn’t been any other manufacturers done this test with regular products because of the high cost and lacking of confidence of their airbags’ performance. Generally they employ a small size airbag to do the hydraulic burst experiment and then infer to all sizes.
At the request of research department of China Shipbuilding Industry for the amendment of CB/T3795, Evergreen-Maritime did this “Hydraulic burst test” with regular Evergreen Marine Airbags. As per the requirement of industry standard, we randomly selected three pieces D1.5xEL8m YT-6 type Evergreen Ship Launching Marine Airbags to do the bursting test orderly under the same condition.
The result is as follows:
For the first Marine Airbags, the Hydraulic bursting pressure is P1= 0.73 MPa
For the second Marine Airbags, the Hydraulic bursting pressure is P2=0.71Mpa
For the second Marine Airbags, the Hydraulic bursting pressure is P2=0.72Mpa
Thus, the average bursting pressure is P= (P1+P2+P3)/3= 0.72 Mpa.
Then we select the safety working factor 6 (the industrial standard demands this factor for 4.5)
Pe = P/n= 0.72 Mpa / 6= 0.12 Mpa
Thus, we define the “Safety Working Pressure” of YT-6 type Evergreen Ship Launching Marine Airbags with 1.5 m diameter as 0.12 Mpa. For ship launching airbags with other diameter sizes, we did the same Hydraulic burst experiments to define the safety working pressure data.
. There is the detailed stipulation in CB/T3795 standard.
