Dec 022014
 

Curiosity is a much underused tool for improving safety. From the commissioning of the 93m chemical tanker Key Bora in 2005 no-one wondered why the astern response of its controllable pitch propeller, CPP, was four times slower than its forward response, it was accepted with a shrug as just one of the quirks of this particular vessel. It had not gone unnoticed, it had just gone unquestioned until she rammed a jetty in Hull putting a 90cm hole in her bulbous bow just above the waterline.

It is a good example of how something Not Quite Right, NQR, can lead to a close call and when both go unremarked sooner or later there will be a hit. In the old days of naval warfare the first shot rarely hit the target, it would either overshoot or under shoot the target. A range adjustment would be made and a second shot fired. If that didn’t hit the target it still enabled the gun crew to get a more accurate range, to bracket it, and the next shot would hit the target. A wise commander on the target vessel would take avoiding action to prevent the aggressor bracketing his vessel. Continue reading »