Tea staining of stainless steels is a phenomenon that occurs where water with a significant chloride content is in regular contact with the metal surface.
Keeping internal equipment operating at optimal temperatures can be difficult to manage. Sometimes the internal equipment needs to be cooled and other times it needs to be heated depending on a number of considerations. Regardless, the objective remains that the equipment should be protected at all temperatures. All applications have various considerations and solutions which combine to create a complex decision-making process.
Victorian railways have traditionally used single skinned cabinets built to VRIOGS (Victorian Rail Industry Operator’s Group Specification) for both metropolitan and regional installations. With the implementation of new technologies in the rail industry, heat rise within signalling cabinets has become an issue due to the more electronic nature of control equipment.
When conditions are humid or the temperature in an environment suddenly drops, the water held in the air around us cannot stay suspended as a gas, and must condense back into water. It does this on any cold surfaces it can find including car windows, grass, mirrors, etc. The temperature at which this happens is called the DEW POINT and the water that condenses is known as condensation (or dew). This same effect can cause problems with electrical equipment as condensation can occur inside enclosures and on sensitive equipment if they are not suitably protected.