Shock tubes of crude heaters

[0707]

We have two crude heaters furnaces of 15 meters high by 25 meters long. The crude unit has two heaters in parallel. In both heaters, on shock tubes, we experienced coil tubes bending, because of loss of tube supports. In one of the heaters, the top radiation coil, of the shock zone, which has the cross over, to make the transition to the convection zone, fell down completely over the soil of the furnace. Happily this occurrence happened without the rupture of the coil. At the moment the unit is being shut down, so that we might decide what to do and find out what really happened. Did anyone of forum already experience such a similar failure?

Thank you in advance

 

[25362]

I haven't had such an experience. Wonder whether the following link (section 6) could be beneficial:

http://tlbmfg.co.kr/data/ks/01.pdf

 

[0707]

Thank you 25362 for your share. We already have the API you mentioned in your link

 

[0707]

After a closer look to the shock zone of the damage of furnaces and verification of process parameters, we are able to say that some of the supports were broken suddenly, due to an upset in the furnace feed, which originated a strong blow up inside the tubes and consequently the supports were broken. The upset of the process and explosion inside the tubes happened, because of different densities in the crude, and strong reaction of light and heavy oil at high temperature.