Valves made for the specific equipment may be classified as the same category as the equipment, which they are made for.Ĥ. The group of media mixture is determined by the most hazardous media.ģ. Category of equipment with different cavities is the highest category, defined for each cavity separately.Ģ. MAXIMUM ALLOWABLE PRESSURE – maximum pressure, on which the equipment optimized, calculated by manufacturer.ġ. NOMINAL DIAMETER, NOMINAL INSIDE DIAMETER (for pipelines and valves) – a numerical designation of size equal to the rounded value of the inner diameter, which is indicated for all components of the equipment except components indicated by the outer diameter or the size of the thread. VOLUME/CAPACITY (for vessels and boilers) – the volume of the internal cavity of the equipment, determined according to nominal sizes from the drawings Indicate volume (capacity) or nominal size (DN) GROUP 2 includes all other working mediums, which do not refer to group 1. GROUP 1 includes working mediums consisted from flammable, oxidizable, combustible, explosive, toxic and high-toxic gasses, liquids and vapors in the single-phase state and also their mixtures PIPELINE – a set of parts and assembly units of pipes with elements, which are their components (tees, cones, L-bones, valves), which are designed for transportation of medium from the source to the consumers. VESSEL – the hermetically sealed container (permanently installed or mobile) designed to conduct chemical, thermal and other processes, as well as for storage and transport of gaseous, liquid and other substances īOILER – a device designed for water heating or generating steam at a pressure exceeding atmospheric pressure and used outside of this device How to use «Equipment Category Calculator»: