In the investigation report of “November 2″ accident in Guangxi, a very direct and key reason is the lack of visualization strategy for the operating state of equipment, which can easily lead to the operating state of equipment being separated from the operators. Enterprises generally operate on 24-hour shifts, and contractors’ operators may also change frequently. The personnel after the rotation do not know what the equipment has been through, which can easily lead to equipment misoperation. Therefore, Lockout tagout for equipment is one of the most effective visualization measures, which can timely and quickly convey the status of the equipment to the field personnel. The so-called Lockout tagout is to mark the operation status of key equipment in writing and post it on the equipment itself. The label content generally includes the device name, status, action date, responsible person, etc., and the label color is best in eye-catching red or yellow.
In the North Sea LNG “11.2″ accident, operators would never have made this simple and fatal mistake if the operator had properly implemented the labelling system for the operation buttons in the control room, marking the operation buttons on the second emergency shut-off valve.
In addition, the method of preventing valve operation error can also be used for reference by foreign companies. The following figure is the valve management system from Daijin Fluorine Chemical Company, for reference.
In the case of North Sea LNG “11.2″, if the Lockout Tagout system had been well implemented to Lockout the Tagout at the valve and the field operating column at the first emergency shutoff valve closure, it would have eliminated the need for a forced operation at the Engineer’s back station in the control room. Because the purpose of strong placement is also to worry about personnel misoperation. The reason why personnel may misoperate, to a large extent, is that they do not grasp the running state of the equipment (the field operation column is generally a shell with a cover, and the chance of accidentally touching the button is very small).
LOTO-Prevent valve misoperation（1） Related Video:
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