stress corrosion cracking in ammonia tanks
? What is? the root cause for this SCC What is the problem with SCC SCC can threaten the integrity of the ammonia containment equipment. Stress Corrosion Cracking has been detected in ammonia storage tanks, spheres and other process equipment that is in contact with liquid ammonia.t is difficult to repair SCC damage. Often complete replacement of the equipment (like a new tank) is necessary when SCC is found.The presence of oxygen (air) and residual stress are the causes for forming SCC cracks. Therefore the ingress of air into ammonia containing equipment must be prevented.
Introduction The following article is a follow-up to Industry Study Indicates Stress Corrosion Cracking in Anhydrous Ammonia Storage Vessels, which appeared in the October 1988 BULLETIN.he tests showed that some inorganic amines and ethylenediamide inhibited cracking in air-contaminated ammonia. Because the molecular constitution of hydrazine (N2H4) is similar to that of ammonia (NH3), this compound was subjected to further tests at concentrations ranging from 0.002 to 1.0 percent.