What Happened

A leak test was conducted on a midline buoy. During the procedure, the buoy was ruptured due to over pressurization and flipped up rotate 180 ̊. At the time the injured person walking one step away from the buoy after closing the valve. The rupture impact caused the person to fall on the deck.
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Root cause

  1. There was no written procedure, including JHA for leak test of buoys specifying the pressure limit, pressure gauge range limit.
  2. Lack of crew experience. During Leak/pressure testing of large vessels, one should bear in mind that even significantly low testing pressure creates a high rupture force due to the big internal surface area of the tested object.

Corrective actions

  1. The work procedure, including RA for leak/pressure test to be available before the job started specifying the pressure limit, pressure gauge range limit.
  2. Propper tools to be defined in the procedure and used, i.e. low range pressure gauge, pressure regulator.
  3. Propper instruction and training of the personnel in charge is required prior the job started.

posted 03 Apr '18, 13:21

April 3, 2018, 1:21 p.m.
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