We started on the drawing board of our 3D modeling software to come up with a pit that offers the engineering and sophistication level of an oilfield equipment. We calculated heat loss for different wall thicknesses, checked Geometric Dimensions and Tolerances (GD&T) and selected an insulating, high temperate paint to come up with the BBQ pit !!(WT$#%**?). That's what happens when you put an R&D engineer on making a pit, in a $48 per barrel oil patch that literally sucks as of today (June 2016).
In oilfield if a hammer does not work, you find a sledge hammer. This is what we have done designing this pit. It is over engineered to last a life time with a quality to withstand years of use (and abuse). Your pit is constructed by 6G qualified welders (another over kill). We are using calibrated welding machine and constructing it in a building that has 5 ton overhead crane (though you don't need it to lift this pit). Even the temperature gauge is heavy duty all stainless premium temperature gauge (made in USA). The end result is a pit that can retain heat longer, offers features and durability that is unmatched in the industry