Fire Tube Boiler!
Fire Tube Boiler!
(OP)
Hi Dears
We have a 10 ton fire tube boiler with 7bar pressure.
8 tubes have some leakage in tube to tube sheet joint. We expanded them but it did not solve our problem!
How many times we can expand tubes?!
Can we do hydraulic test several times? (If the answer is yes, with which pressure and temperature?)
thanks all
We have a 10 ton fire tube boiler with 7bar pressure.
8 tubes have some leakage in tube to tube sheet joint. We expanded them but it did not solve our problem!
How many times we can expand tubes?!
Can we do hydraulic test several times? (If the answer is yes, with which pressure and temperature?)
thanks all





RE: Fire Tube Boiler!
The best pressure to test the tubes at is the Set Pressure of your relief valve. The Boiler Feed Pump can supply this easily, and there is no limit to haw many times you can pressurize the boiler to this pressure. Take care to not use very cold water. Some materials used in boiler construction may brittle-fracture at 15-deg. C or colder. Much safer to use 25-deg C or hotter water. If the tubes keep leaking, consider seal-welding the end of the tube to the tubesheet.
RE: Fire Tube Boiler!
RE: Fire Tube Boiler!
our boiler has been in service for 2 years.
we are sure that there is leakage from tube-tube sheet joint.
I agree with Duwe6, we have to consider seal welding.
RE: Fire Tube Boiler!
if in the US or Canada, consider permitting
weld job done by a R or S stampholder,
if the boiler inpector find out you welded w/o permitting, you may be in a lot of trouble and may loose the whole boiler or may have to do the whole tubejb. just an advise.
RE: Fire Tube Boiler!