Isolation valves are usually provided if the location of the nozzle is below the column level or on small bore lines which are more susceptible to damage.
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In regards to the design considerations of pressure vessel and the bottom head of skirt supported vessel why should the flanged connections be outside of the skirt?
Flanged connections should be outside of the skirt to minimize leakage in confined space.
In regards to the design considerations of pressure vessels, where will the pipe supports be attached?
Pipe supports will be attached to the side of the vessel.
In regards to the design considerations of pressure vessels, when does the piping drop or rise?
Piping should drop or rise immediately upon leaving the tower nozzle and run parallel along the side of the vessel using the wind load on the nozzle as constraint.
In regards to the design considerations of pressure vessels, who controls the nozzle location?
The nozzle location is controlled by the vessel engineer.
In regards to the design considerations of pressure vessels, what should also be taken into account between the vessel shell and the piping?
The thermal expansion should be taken into account between the vessel and the piping.
In regards to the application guidelines of tanks, what are flammable liquids?
Flammable liquids are filled near the bottom of tank to prevent static electricity buildup.
In regards to the design considerations of pressure vessels, how will vessel specifications determined?
Vessel specifications will be determined by the process engineer. Specifications include the size/capacity, pressure rating, wall thickness, material, type of connection, etc.
In regards to the application guidelines of tanks, what are block valves?
Block valves are supplied on any nozzles below tank level.
In regards to the application guidelines of tanks, what are feed tanks?
Feed tanks separate feed and discharge systems.
In regards to the design considerations of tanks, what is the function of the technostructure?
The technostructure functions as a differential settlement between the tank and the piping supports.
In regards to the design considerations of tanks, what is the function of the support staff?
The support staff functions as the weight of piping, valves, and contents.
In regards to tanks, what are the three application guidelines?
The three application guidelines of tanks include feed tanks, block valves, and flammable liquids.
In regards to the design considerations of tanks, what is the function of the operating core?
An operating core has tank shell radial movements and nozzle rotations while filling and emptying tank.
In regards to the design considerations of tanks, what is the function of the strategic apex?
The strategic apex designs pressure of the system.
In regards to the design considerations of tanks, what is the function of the middle line?
The middle line functions as the thermal expansion of piping.
What is a pressure vessel?
A pressure vessel is a storage device meant to hold fluid media while simultaneously containing reactions at pressures above atmospheric pressure.
What is a tank?
A tank is a storage device meant to hold fluid media, either liquid or gas. Pressure developed is a function of the tank size and not a result of any external forces.
108" Dia. Storage Tank and Containment Tank Designed for a Chemical Plant in Texas
Sweco Fab., a division of PT&P, designed and fabricated this 108″ diameter storage tank that will be submerged inside a containment tank for a chemical plant in Texas. The storage tank is fabricated from 1/2″ thick SA516-70 carbon steel and is 240″ in length. The containment water tank measures 295″ L x 124″ W x 128″ H. The storage tank is designed for 100 PSIG at 130°F internally and 15 PSIG at 130°F externally. The storage tank was hydro tested for 1 hour at 150 PSI and a full radiography test was done prior to shipment.
42" Dia. Stainless Steel Storage Tank
Sweco Fab. designed and fabricated storage tanks from 1/4″ thick ASTM A240 grade 304 stainless steel. The tanks are 42″ in diameter, 72″ in overall length and 39-7/8″ in height. The legs are fabricated from SA36 carbon steel. They are designed for 1 PSIG and ambient temperatures. The storage tanks were hydro tested and leak tested for 8 hours prior to shipment.