Define and Visualize Pressure Vessel Parts Flashcards
Shell
The cylindrical portion of a vessel or tank
Skirt
Cylinder similar to a shell, which is used for supporting vertical vessels
Skirt Vents
Small circular holes cut out of a skirt to prevent collection of dangerous gases within the skirt
Skirt Access Opening
Circular hole cut out of a skirt to allow workmen to clean, inspect, etc. inside of skirt.
Head
The end enclosure of a vessel or tank
Base Plate
Flat plate welded to a vessel supports and bearing on concrete foundation
Anchor Bolts
Bolts embedded in concrete foundation and bolted to vessel anchor bolt chairs
Anchor Bolt Chairs
Gussets and plates welded to base plate and skirt to provide for anchor bolt attachment
Nozzle
Generally consists of a short piece of pipe welded in the shell or head with a flange at the end for bolting to the “Piping”
Reinforcing Pad
Plate, formed to the contour of shell or head, welded to nozzle and shell or head
Flanges
Fittings used to connect pipes by bolting together.
Coupling
A fitting welded into the vessel to which the “Piping” is connected either by screwing or welding. This type of fitting is only used pipe sizes 2” and smaller.
Stub End
A short piece of pipe welded into the vessel to which the “Piping” is connected by welding.
Vessel Manhole
Identical to nozzle, except does not bolt to piping and has a cover plate (or blind flange) which is bolted to the flange. when unbolted it allows access to the inside of the vessel. Normally 24” nominal pipe size
Manhole Hinges or Davits
Hinges or Davits attached to manhole flange and cover plate which allow cover plate to be swung aside when in use
Column Davit
A hosting device attached by means of a socket to the top of fractionation columns. Used for handling relief valves, bubble trays, bubble caps, etc.
Process Trays
Circular flat plates bolted to the shell inside of process columns. Used to obtain vapor liquid contact
Support Ring
A flat plate ring welded around the inside of the vessel for the support of internals such as trays, demisters and grating.
Downcomers
Rectangular flat plates bolted to shell and trays, inside of process columns. Used for directing process liquid and to prevent bypassing of vapor
Seal Pan
Flat plates bolted or welded to inside of a process column shell below downcomer of lowest tray. Used to prevent vapor bypassing up through the downcomer.
Demister
A wire mesh pad sandwiched between two light grids. Used to disengage liquids contained in the vapor
Insulation Rings
Rings made of flat bar or angle, attached around the circumference of vertical vessels and spaced approximately 12’-0 3/4” apart. Used to support the weight of the vessel insulation.
Skirt Fireproofing
Specialized concrete applied inside and outside of skirt to prevent damage to skirt in the event of a fire.
Saddles
Steel supports for horizontal vessels.
Support Legs
Legs made of pipe or structural shapes, used to support vertical vessels
Vacuum Stiffener Rings
Flat plate or structural shape rings welded around the circumference of the vessel. These rings are installed on vessels operating under external pressure in order to prevent collapse of the vessel.
Vortex Breaker
A device located inside a vessel at the outlet nozzle. It normally consists of plates welded together to form the shape of a cross. It is used to prevent cavitation in the liquid passing thru the outlet nozzle.
Support Grid
Grating or some other type of support thru which vapors can pass and upon which can be supported solid packing such as catlyst or raschig ring.
Distributor Tray
A perforated tray which provided equal distribution of liquid over the vessel diameter. Risers on the tray extend above the liquid level to permit passage of vapors rising upward.
Chimney Tray
This type of tray is used to collect and remove all liquid product from particular portion of the vessel. Chimneys extending above the liquid level to permit passage of vapors upward.
Internal Pipe
Pipe extending inside the vessel in order to provide adequate distribution of liquids and vapors. Bolting flanges are used to make the piping removable from the vessel.
