One falls under the lifesaving equipment regulations in Canada, the other doesn't.
The completed installation is subjected to tests in accordance with SCHEDULE IX of the Canada Shipping Act’s Life Saving Equipment Regulations (See Referenced Sections):
• Static Load Test of davit arms at full outreach = 2.2 x S.W.L. (Ref.: Section 8 ).
8. In the case of all davits made of cast steel or of wrought steel or
other material fabricated by a welding process, each davit at full outreach
shall be capable of withstanding a static load test of not less
than 2.2 times that part of the working load supported by each arm.
• Lowering Test = 1.1 x Maximum Loaded Weight of the craft (Ref.: Section 13).
13. (1) Where lifeboats and life rafts must be capable of being
lowered fully loaded, each pair of davits and each launching device,
including winches and brakes where fitted, shall be capable of safely
lowering the lifeboat or life raft loaded with the required equipment
and a distributed weight equal to the number of persons for which it
measures plus 10 per cent of the total load, including blocks and falls.
When we last built davits, they underwent tests ashore of 2.2 x SWL to ensure that there would be no failure.
Then when they went on the ship, there was a static load test with weights hung from the davit head to ensure that the foundations were designed correctly. Welds were NDT and structure examined for deformation.
Then the lowering test ensured that the brakes and running gear were capable of stopping and holding a boat.
Ok now, cranes, tested at 1.25 safe working load in shop test and on the ship subjected to a 1.25 x SWL test with boom at full extension at 90*. Same deal, all foundation checked.
Now, we get into the barges, workboats ect...what do they fall under. I guess to be on the safe side you would follow the lifesaving regs.
I have been recently told that the drop test is acceptable on lifesaving davits because if they can take that without failing, then they don't need the 2.2 static test. I was rather shocked...apparently this is accepted outside Canada.
Can someone enlighten me on that little detail? I was more then surprised to be told that.