In close cooperation with one of our customers in the chemical industries, we had set up a pilot to improve the safety around manholes in shutdowns.
One of the conclusions: The lack of a clear marker for open manholes is a potential hazard.
The absence of a marker invites you to look in the tank, with all its consequences. Personal accident occurred because there are nitrogen, toxic substances and / or moving parts in the tank.
By using a simpel sign which is easy to attach to the flange, the chance of accidents is virtually eliminated. The sign has an elastic cord which makes it suitable for mounting on all common flanges of manholes.
