Bking1340

I have a gas detector in my garage which measures O2 %, CO ppm and Explosive LEL. Used it on my previous forging session (Only half an hour) and could not see any changes. The pressure gauge reads from 0 - 250kpa. Just went through the manual again and the maximum recomended pressure are 150kpa. On the regulaor it`s written, 0-30psi. I normally heat up the forge at 75kpa and after 5-10 minutes the refractory starts to glow yellow. After 15 minutes I go down to 50kpa and 6mm 5160 flatbar will reach forging temperature in a breeze. Jeez this is a bummer - Kevin Harvey - ABS master bladesmith are living 50 miles from me using the exact same forge with exact same nozzle burner settings without any issues. Neels van den Berg where I bought this forge are living 90 miles from me using 2 of these for his bladesmith classes 5 days a week and they run for minimum 4-5 hours a day. 1 of them are 9 years old and only now needs some tlc, but still working good. I can`t see that it can be the forge itself - dont see any cracks or anything odd inside or outside. I uploaded another video just to show the forge/gas cylinders and my garage layout.

Sorry, must also add that if I use my wifes hair dryer and blow air into the burner opening, the forge will also go back to normal until I remove the hair dryer and back to that dull sound with blue flames

Listen Im amazed about all the replies, really appreciated. I will change my avatar shortly. Timgun u r correct "Forge runs well, then it looks like it goes horribly rich and presumably the temperature drops if you let it? You close the choke and open it and it starts burning correctly for a short while before going horribly rich and repeating?" Sorry for that crappy cellphone video, but I just checked it again and the mic do not change while moving my phone, it's the sound of the forge/burner changing and im only making changes on the air as on the video to show that if I close and open the air again, it's growling nicely for a few seconds and then back to that dull sound with big blue flames coming out of the forge. The ambient temperature in my garage are 10°C (50F) winter times and 25°C(77F) summer times without the forge running. Like I said summer times the forge are only acting up after 2 hours. I tried 3 different bottles, 2x 19kg(41,8 pounds) and 1 x 14kg(30.8 pounds). I can't see that the tanks are freezing up (nothing at the valve or regulator seems odd). 1 are half empty , 1x full and 1x 1 hour runtime. I start the forge on 50kpa(7.25 psi), but tried different setting up to 130kpa(18.85 psi) which according to the manual are the maximum. Tried 3 different regulators which 2 of them were brand new. When the forge goes to that dull sound, the regulator pressure gauge are exactly where I set it and do not drop or increase. The last thing I must add is that my forge are in a double garage - 2 big front doors and one normal small back door. Summer times my one big front door were a 1/4 open, and the small back door due to the garage getting too hot. Now in winter I only open the small back door. So the next thing I will try next week (very busy at work) is to open both front doors and the small back door + a fan, maybe the oxygen are dropping and the co are increasing.

Good day all Can someone please watch my video and listen to the sound my forge are making. It works great for +- 45 minutes - heats up fast and a nice growl/dragon sound. Then after +- 45 minutes a dull sound and you can hear and see it`s not heating great anymore. https://youtu.be/ZDySpG2h0sE I went for a blade smith course on December at Neels van den Berg (great bloke - also on youtube) and also bought this forge from him. Nobody got problems with theirs except me and he sold hundreds of these. I phoned him and he immediately send me a complete new burner with regulator - same problem. I must add that it is winter here and in summer time it also had this problem but only after about 2 hours. I played around with the nozzle - on the edge of the air opening - 5mm(0.2 inch inwards/outwards) Burner tip flush inside - moved out in increments of 10mm(0.4 inches) to 30mm(1.2inches) Different air openings, different size gas bottles - 14kg/19kg. Any help will be appreciated. Jaco