"During gas freeing operations, cargo tank manway and butterworth openings are opened and the flammable vapors within the cargo tank are then removed using mechanical air moving equipment. As outside air is introduced into the cargo tank, the vapor/air mixture within the tank, and near the tank openings, will fall into the flammable range. During this time, if the air moving equipment used to gas free the cargo tank is not the proper type, is not properly maintained, or is not properly electrically bonded and secured to the vessel’s structure, static electricity generated by the air moving equipment can discharge as an electric arc and ignite the flammable vapor/air mixture".
Read the full safety alert with photos in this link https://www.dco.uscg.mil/Portals/9/DCO%20Documents/5p/CG-5PC/INV/Alerts/0120.pdf?ver=2020-01-30-101338-710
No comments:
Post a Comment