Causes of cracks in the liquid ammonia pump cylinder block
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The liquid ammonia plunger pump of model 3YA-39/22TB, which is used in urea production via the hydrolysis process, was found to have cracks in the intermediate valve chamber during maintenance; the cylinder body of this pump is made from a single forged piece of 45# steel. Could the experts please analyze the causes of these cracks? Have other professionals encountered similar problems?
I’m not sure if there was any pressure buildup during operation; does the cylinder need to be repaired? If not, the cracks can be opened up for inspection to determine whether there are defects in the forging process. How is the temperature when the pump is running and vibrating?
There are many reasons for cracks in pump cylinders; aside from material issues, a finite element analysis can be conducted to determine whether the cylinder structure is suitable for the operating conditions.
It’s happened several times; minor repairs were done, but this one cannot be repaired and must be scrapped