Process vacuum condensers have different types of configuration. Removable bundle or fixed tubesheet design are the main two types. Below are the TEMA designations to help make sense of the condenser types. In both cases the cooling water side, typically the tube side, should be inspected for any debris or fouling. This can be done by either using an inspection port or manway, if provided, or by removing the channel cover or bonnet. In all cases the gaskets should be replaced once removed for inspection. This will insure a good seal once it is back in service as a poor seal could cause performance issues. Any debris or build-up that is found should be cleaned out to insure the condenser is operating well. In case of scaling, tube side can often be chemically treated. Various brush type methods are also available for further cleaning. Consulting with your company’s water and process chemistry experts should be the first step before cleaning is started. A way to identify a potential fouling issue before inspection would be if there was a high pressure drop. Some examples of tube side fouling with debris are shown below. These are extreme examples of issues, which include trash build up, river sediment, and biological build up. Fouling is not always easy to identify like the examples. A very small amount of fouling tube side or shell side can drastically affect the heat transfer rate achieved.