Horizontal vessels and drums are relatively large diameter cylindrical pressure vessels used for a variety of process functions. Their height above grade is usually determined by the NPSH requirements of the pumps in the liquid outlet line or the gravity flow requirements to other equipment. And they are supported by the use of saddles.
Chapter 13. Horizontal Drums
13.1 Horizontal Vessels and Drums
13.2 Vessel Boots and Weirs
13.3 Nozzle Orientation
13.4 Platforms
13.5 Horizontal Drum Spacing and Location
13.6 Horizontal Drum Piping
Can u give some design and calculatin of vessels