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Boiler Testing
Saturday, October 25, 2003 By: J Alastair Anderson We have a Cleaver Brooks Boiler (1995) operating in a Corrugator plant in Latin America with a working pressure of 200 PSI. Recently about 70 tubes had to be replaced in the boiler. This was done. Would it be normal to perform a hydraulic test on the boiler after the repair and if so what pressure would be used?
Thanking you in anticipation. Post a Reply... Viewed 2528 times
Monday, October 27, 2003 By: GGalanes Depending on the tube failure mechanism, performing a hydrostatic test is NOT required by Code. The hydrostatic test (which by definition is using water to pressurize the component to 1.5X maximum allowable working pressure) is something that I take seriously because depending on the age of the boiler more harm than good can ocurr. We have found that pressure tests on high pressure boilers can result in increased tube failures from corrosion fatigue - for a low pressure boiler this is probably not the case.
In my opinion, an operating or working pressure squeeze will provide more than enough information concerning the potential for MISSED leaks. It will NOT provide any information as to the remaining life of the tubing. (Since I am a member of the National Board Inspection Code main committee - my opinions are NOT representative of the committee or the National Board). Post a Reply... Viewed 2542 times
Wednesday, October 29, 2003 By: SChristian the company i used to work for made an agreement with the AI/Insurance company that they could do an operational pressure squeeze if tube welds were xrayed.
i agree that an full hydro can cause more damage than expected and is more suited to original construction or major re-powering projects. Post a Reply... Viewed 2560 times
Sunday, October 26, 2003 By: ashiq Hussain Since a major repair work has been carried out on the boiler, there is a need to subject the boiler to full hydrostatic test pressure which is 1.5 times MAWP. PSV's should be blinded during the hydrotesting. since it is not mentioned in your enquiry as to what was the reason of retubing, it would be worthwhile to inspect and carry out condition assessment of remaining tubes as well. The boiler may pass the Hydrotest but it may start to have problem due to one of the weaker tubes. Hydrotest is normally produces 90% of yield stress but the tube will rupture at tensile stress. These limitations need to be considered before finalizing on hyd. test.
Post a Reply... Viewed 2615 times
Sunday, October 26, 2003 By: ERomero hydrostatic test is done by filling the boiler completely with water at 1.5 times the MAWP for a few minutes, then bring the pressure down to the MAWP and inspect for whatever time you wish to observe for leaks. ER
Post a Reply... Viewed 2557 times
Sunday, October 26, 2003 By: Ed Fox, Tampa, FL Also when you hydro test you will have to either gag the safety valves or install a hydro plug in the valve to keep the valve from lifting. If you gag the valve be sure to follow the O&M Manual so that the gag is applied squarely as to keep the valve stem from bending.
Post a Reply... Viewed 2586 times
Saturday, October 25, 2003 By: Viewed 2555 times Published on steamforum.com
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