CAUSES OF DETERIORATION IN PULSATION DAMPENERS
There are a variety of conditions that cause deterioration in pulsation dampeners. The common conditions are listed and described below:
- Pitting: Shallow, isolated, scattered pitting over a small area that does not substantially weaken the vessel. It could, however, eventually cause leakage.
- Line corrosion: This is a condition where pits are connected, or nearly connected, to each other in a narrow band or line. Line corrosion frequently occurs in the area of intersection of the support skirt and the bottom of the vessel and at the liquid-vapor interface.
- General corrosion: This is corrosion that covers a considerable area of the vessel. When this occurs, consider the safe working pressure of the vessel that is directly related to the remaining material thickness.
- Grooving: This type of corrosion is a form of metal deterioration caused by localized corrosion. It may be accelerated by stress concentration. Grooving may be found adjacent to riveted lap joints or welds and on flanged surfaces, particularly the flanges of unstayed heads.
- Galvanic corrosion: Two dissimilar metals in contact with each other and with an electrolyte (i.e., a film of water containing dissolved oxygen, nitrogen, and carbon dioxide) constitute an electrolyte cell, and the electric current flowing through the circuit may cause rapid corrosion of the less noble metal (the one having the greater electrode potential).
Inspecting your vessels on a regular basis for corrosion and other issues is good preventive maintenance! Let our team of experienced engineers assist you with a FREE Safety Analysis. Click here for more information.