I work in inspection in an oil refinery and when they want to expedite repairs on a product heater during a shutdown they are required by OSHA to do a wet bulb temperature check This allows them to set up entry guidelines to the high temperature area. As an example, be in there for 5 minutes then come out for a rest period of 10 or something like that. I did some quarterly infrared inspections in Oklahoma in the summer in fertilizer plant on Ammonia Reformers that run 1800F inside. I was outside but they often had problems with the refractory (insulation) systems. I was in a kind of a tunnel about 10 ft wide but it did have an open top, but with a grated catwalk. There areas I was inspecting was a 20 foot high and about 70 foot long. Its lowest temp was 250F and the areas that were failing were 400F up to near a 1000F. The hottest areas were small maybe a 1 foot square. Below me the floor area was 200F - 350F and 10ft behind me another sidewall of the furnace at the 200-350F range as well. I would literally walk quickly down focus the camera and record the image and then come out to record the location on my drawing. Many times I came out of there soaked clear through to my underwear with sweat. It maybe does not beat the TV story or JeffNWOH buy it was hot. In the summer I would start early in the morning like 4am to have a cooler area to work in. The one time I was there the overnight temp did not drop below 90F. My FIL lives in Vegas and for a time worked in HVAC, he said the big lighted signs all have AC in them otherwise the control system would overheat and burn out. I forget the tonnage of the systems he quoted but I remember it was impressive.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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