I have had delivered bundles of hot rolled sheet, 2-6mm, that have become quite distorted during transport. Looking at them, it seems there were insufficient bearers used to separate them, some bearers were too short, and they were placed all over the place (bearers not above each other). The...
Hi guys,
There is a total of 5 STL tanks in operation which are connected to chillers for district cooling. During the night when cooling usage is low, cool brine will be passed through the tanks to freeze up the ice balls inside to store the latent heat. During the day, the ice balls will be...
Hi guys,
There is a total of 5 STL tanks in operation which are connected to chillers for district cooling. During the night when cooling usage is low, cool brine will be passed through the tanks to freeze up the ice balls inside to store the latent heat. During the day, the ice balls will be...
Thank you so much for your thoughts.
The water side of the furnace chamber is scaled. Usually if there is scale, you would find evidence of long term overheating when we examine the microstructure of the boiler steel. We do not find this, which suggest that the overheating had only recently...
Thanks again for the responses.
Macmet,
There is no structural components at the 3 and 9 positions. These positions are immersed in water so does the entire furnace chamber.
Chicopee,
You are right the cost of repair is more or less equivalent to a new boiler, so a decision has been made to...
Hi Keith,
Thank you for your insights. It was very useful. The pressure gauge used to conduct the hydrostatic test was calibrated before the test was conducted and checked again after the incident. The gauge was reported to be in good condition. My initial thoughts were overpressure but the...
When you say improper venting do you mean that there might have been air pockets trapped on the water side of the boiler? On the fire side, the manhole covers were all opened during the hydrostatic test so that leaks could be detected.
For years the hydrostatic test was done in this manner...
Thank you for the input. The bulging is throughout at those positions but there is one area where the extent of bulging is more obvious.
It can be confirmed that there was no drainage of water to the boiler that could have caused overheating. There is no warping to the tubesheets. The second...
Thank you for the response.
The boiler is a Babcock Robrey 3 pass wetback fire tube boiler. It has a capacity of 15000 PPH, design pressure 262 PSIG and working pressure 250 PSIG. The hydrostatic pressure is 393 PSIG (27 bar).
We have done a thickness test of the plate and the thickness is...
Dear All,
I have got a problem with my fire tube boiler. The boiler has three passes in which the hot gasses pass through. The first pass is where the fuel oil burner is mounted and is also referred to as the furnace chamber. This chamber has a diameter of 1254mm, length 4453mm and a plate...
To electricpete:
Appreciate the detail of your reply. In your second post you refer to a figure, but when I click on the link I am taken to a Google page featuring a book, Handbook of Electric Motors, by Hamid A. Toliyat, Gerald B. Kliman. I may well buy the book, but this will take time, so...
