No. All the code clearances have been met in the layout of the substation and as such firewall is not necessary. Had it been that the oil containment was to be designed for multiple transformers, the argument for not designing for the total volume of all transformers would have been perfectly...
Thank you @stevenal for your reply. The grounding design meets the requirements of IEEE 80 as is according to the electrical engineer, and he doesn't seem to be willing to make any input on the issue of fire safety for less-flammable oil which is why I am trying to find anything in the...
Thank you @dik for your suggestion. In fact, my initial concept was using a Sorbweb "window" to deal with the rain issue but the client vetoed it on the spot. But even with Sorbweb, would you omit the crushed rock layer when the oil is less-flammable? I mean there is a clear difference in the...
Hi. I have been asked to design a foundation and oil containment pit for an outdoor transformer in a substation. The insulating oil (FR3) in the transformer has a high flash point (~330 C) and is self-extinguishing and non-propagating. I wonder if there is still a need for the pit to be filled...
Well, The column has certainly lost a percentage of its capacity, not to the point of failure but enough that its overall factor of safety has decreased. The paint and coating are very weak against direct impact which means the damaged section does not have the same protection against corrosion...
Thank you for your prompt response. I agree that the column situation is not critical yet but the report is necessary nevertheless . The metal bollard is a great suggestion. However, I wonder if heath straightening is necessary before welding the cover plate to the flange? And if so, what would...
I have been asked to prepare a report on repair options for a wide flange column (W6*15) damaged from collision in a mine. Although the damaged area (bottom 20" from the base plate) is far away from the critical zone of buckling, I believe repair is necessary considering the increased...
